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 /*

  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package com.sun.tools.javadoc;

 import java.io.File;

 import java.io.IOException;

 import java.lang.reflect.Modifier;

 import java.net.URI;

 import java.util.HashSet;

 import java.util.Set;

 import javax.tools.FileObject;

 import javax.tools.JavaFileManager.Location;

 import javax.tools.StandardJavaFileManager;

 import javax.tools.StandardLocation;

 import com.sun.javadoc.*;

 import com.sun.tools.javac.code.Flags;

 import com.sun.tools.javac.code.Kinds;

 import com.sun.tools.javac.code.Scope;

 import com.sun.tools.javac.code.Symbol;

 import com.sun.tools.javac.code.Symbol.*;

 import com.sun.tools.javac.code.Type;

 import com.sun.tools.javac.code.Type.ClassType;

 import com.sun.tools.javac.code.TypeTags;

 import com.sun.tools.javac.comp.AttrContext;

 import com.sun.tools.javac.comp.Env;

 import com.sun.tools.javac.tree.JCTree;

 import com.sun.tools.javac.tree.JCTree.JCClassDecl;

 import com.sun.tools.javac.tree.JCTree.JCFieldAccess;

 import com.sun.tools.javac.tree.JCTree.JCImport;

 import com.sun.tools.javac.tree.TreeInfo;

 import com.sun.tools.javac.util.List;

 import com.sun.tools.javac.util.ListBuffer;

 import com.sun.tools.javac.util.Name;

 import com.sun.tools.javac.util.Names;

 import com.sun.tools.javac.util.Position;

 import static com.sun.tools.javac.code.Kinds.*;

 import static com.sun.tools.javac.tree.JCTree.Tag.*;

 /**

  * Represents a java class and provides access to information

  * about the class, the class' comment and tags, and the

  * members of the class.  A ClassDocImpl only exists if it was

  * processed in this run of javadoc.  References to classes

  * which may or may not have been processed in this run are

  * referred to using Type (which can be converted to ClassDocImpl,

  * if possible).

  *

  * @see Type

  *

  * @since 1.2

  * @author Robert Field

  * @author Neal Gafter (rewrite)

  * @author Scott Seligman (generics, enums, annotations)

  */

 public class ClassDocImpl extends ProgramElementDocImpl implements ClassDoc {

     public final ClassType type;        // protected->public for debugging

     protected final ClassSymbol tsym;

     boolean isIncluded = false;         // Set in RootDocImpl

     private SerializedForm serializedForm;

     /**

      * Constructor

      */

     public ClassDocImpl(DocEnv env, ClassSymbol sym) {

         this(env, sym, null, null, null);

     }

     /**

      * Constructor

      */

     public ClassDocImpl(DocEnv env, ClassSymbol sym, String documentation,

                         JCClassDecl tree, Position.LineMap lineMap) {

         super(env, sym, documentation, tree, lineMap);

         this.type = (ClassType)sym.type;

         this.tsym = sym;

     }

     /**

      * Returns the flags in terms of javac's flags

      */

     protected long getFlags() {

         return getFlags(tsym);

     }

     /**

      * Returns the flags of a ClassSymbol in terms of javac's flags

      */

     static long getFlags(ClassSymbol clazz) {

         while (true) {

             try {

                 return clazz.flags();

             } catch (CompletionFailure ex) {

                 // quietly ignore completion failures

             }

         }

     }

     /**

      * Is a ClassSymbol an annotation type?

      */

     static boolean isAnnotationType(ClassSymbol clazz) {

         return (getFlags(clazz) & Flags.ANNOTATION) != 0;

     }

     /**

      * Identify the containing class

      */

     protected ClassSymbol getContainingClass() {

         return tsym.owner.enclClass();

     }

     /**

      * Return true if this is a class, not an interface.

      */

     @Override

     public boolean isClass() {

         return !Modifier.isInterface(getModifiers());

     }

     /**

      * Return true if this is a ordinary class,

      * not an enumeration, exception, an error, or an interface.

      */

     @Override

     public boolean isOrdinaryClass() {

         if (isEnum() || isInterface() || isAnnotationType()) {

             return false;

         }

         for (Type t = type; t.tag == TypeTags.CLASS; t = env.types.supertype(t)) {

             if (t.tsym == env.syms.errorType.tsym ||

                 t.tsym == env.syms.exceptionType.tsym) {

                 return false;

             }

         }

         return true;

     }

     /**

      * Return true if this is an enumeration.

      * (For legacy doclets, return false.)

      */

     @Override

     public boolean isEnum() {

         return (getFlags() & Flags.ENUM) != 0

                &&

                !env.legacyDoclet;

     }

     /**

      * Return true if this is an interface, but not an annotation type.

      * Overridden by AnnotationTypeDocImpl.

      */

     @Override

     public boolean isInterface() {

         return Modifier.isInterface(getModifiers());

     }

     /**

      * Return true if this is an exception class

      */

     @Override

     public boolean isException() {

         if (isEnum() || isInterface() || isAnnotationType()) {

             return false;

         }

         for (Type t = type; t.tag == TypeTags.CLASS; t = env.types.supertype(t)) {

             if (t.tsym == env.syms.exceptionType.tsym) {

                 return true;

             }

         }

         return false;

     }

     /**

      * Return true if this is an error class

      */

     @Override

     public boolean isError() {

         if (isEnum() || isInterface() || isAnnotationType()) {

             return false;

         }

         for (Type t = type; t.tag == TypeTags.CLASS; t = env.types.supertype(t)) {

             if (t.tsym == env.syms.errorType.tsym) {

                 return true;

             }

         }

         return false;

     }

     /**

      * Return true if this is a throwable class

      */

     public boolean isThrowable() {

         if (isEnum() || isInterface() || isAnnotationType()) {

             return false;

         }

         for (Type t = type; t.tag == TypeTags.CLASS; t = env.types.supertype(t)) {

             if (t.tsym == env.syms.throwableType.tsym) {

                 return true;

             }

         }

         return false;

     }

     /**

      * Return true if this class is abstract

      */

     public boolean isAbstract() {

         return Modifier.isAbstract(getModifiers());

     }

     /**

      * Returns true if this class was synthesized by the compiler.

      */

     public boolean isSynthetic() {

         return (getFlags() & Flags.SYNTHETIC) != 0;

     }

     /**

      * Return true if this class is included in the active set.

      * A ClassDoc is included iff either it is specified on the

      * commandline, or if it's containing package is specified

      * on the command line, or if it is a member class of an

      * included class.

      */

     public boolean isIncluded() {

         if (isIncluded) {

             return true;

         }

         if (env.shouldDocument(tsym)) {

             // Class is nameable from top-level and

             // the class and all enclosing classes

             // pass the modifier filter.

             if (containingPackage().isIncluded()) {

                 return isIncluded=true;

             }

             ClassDoc outer = containingClass();

             if (outer != null && outer.isIncluded()) {

                 return isIncluded=true;

             }

         }

         return false;

     }

     /**

      * Return the package that this class is contained in.

      */

     @Override

     public PackageDoc containingPackage() {

         PackageDocImpl p = env.getPackageDoc(tsym.packge());

         if (p.setDocPath == false) {

             FileObject docPath;

             try {

                 Location location = env.fileManager.hasLocation(StandardLocation.SOURCE_PATH)

                     ? StandardLocation.SOURCE_PATH : StandardLocation.CLASS_PATH;

                 docPath = env.fileManager.getFileForInput(

                         location, p.qualifiedName(), "package.html");

             } catch (IOException e) {

                 docPath = null;

             }

             if (docPath == null) {

                 // fall back on older semantics of looking in same directory as

                 // source file for this class

                 SourcePosition po = position();

                 if (env.fileManager instanceof StandardJavaFileManager &&

                         po instanceof SourcePositionImpl) {

                     URI uri = ((SourcePositionImpl) po).filename.toUri();

                     if ("file".equals(uri.getScheme())) {

                         File f = new File(uri);

                         File dir = f.getParentFile();

                         if (dir != null) {

                             File pf = new File(dir, "package.html");

                             if (pf.exists()) {

                                 StandardJavaFileManager sfm = (StandardJavaFileManager) env.fileManager;

                                 docPath = sfm.getJavaFileObjects(pf).iterator().next();

                             }

                         }

                     }

                 }

             }

             p.setDocPath(docPath);

         }

         return p;

     }

     /**

      * Return the class name without package qualifier - but with

      * enclosing class qualifier - as a String.

      * <pre>

      * Examples:

      *  for java.util.Hashtable

      *  return Hashtable

      *  for java.util.Map.Entry

      *  return Map.Entry

      * </pre>

      */

     public String name() {

         return getClassName(tsym, false);

     }

     /**

      * Return the qualified class name as a String.

      * <pre>

      * Example:

      *  for java.util.Hashtable

      *  return java.util.Hashtable

      *  if no qualifier, just return flat name

      * </pre>

      */

     public String qualifiedName() {

         return getClassName(tsym, true);

     }

     /**

      * Return unqualified name of type excluding any dimension information.

      * <p>

      * For example, a two dimensional array of String returns 'String'.

      */

     public String typeName() {

         return name();

     }

     /**

      * Return qualified name of type excluding any dimension information.

      *<p>

      * For example, a two dimensional array of String

      * returns 'java.lang.String'.

      */

     public String qualifiedTypeName() {

         return qualifiedName();

     }

     /**

      * Return the simple name of this type.

      */

     public String simpleTypeName() {

         return tsym.name.toString();

     }

     /**

      * Return the qualified name and any type parameters.

      * Each parameter is a type variable with optional bounds.

      */

     @Override

     public String toString() {

         return classToString(env, tsym, true);

     }

     /**

      * Return the class name as a string.  If "full" is true the name is

      * qualified, otherwise it is qualified by its enclosing class(es) only.

      */

     static String getClassName(ClassSymbol c, boolean full) {

         if (full) {

             return c.getQualifiedName().toString();

         } else {

             String n = "";

             for ( ; c != null; c = c.owner.enclClass()) {

                 n = c.name + (n.equals("") ? "" : ".") + n;

             }

             return n;

         }

     }

     /**

      * Return the class name with any type parameters as a string.

      * Each parameter is a type variable with optional bounds.

      * If "full" is true all names are qualified, otherwise they are

      * qualified by their enclosing class(es) only.

      */

     static String classToString(DocEnv env, ClassSymbol c, boolean full) {

         StringBuilder s = new StringBuilder();

         if (!c.isInner()) {             // if c is not an inner class

             s.append(getClassName(c, full));

         } else {

             // c is an inner class, so include type params of outer.

             ClassSymbol encl = c.owner.enclClass();

             s.append(classToString(env, encl, full))

              .append('.')

              .append(c.name);

         }

         s.append(TypeMaker.typeParametersString(env, c, full));

         return s.toString();

     }

     /**

      * Is this class (or any enclosing class) generic?  That is, does

      * it have type parameters?

      */

     static boolean isGeneric(ClassSymbol c) {

         return c.type.allparams().nonEmpty();

     }

     /**

      * Return the formal type parameters of this class or interface.

      * Return an empty array if there are none.

      */

     public TypeVariable[] typeParameters() {

         if (env.legacyDoclet) {

             return new TypeVariable[0];

         }

         TypeVariable res[] = new TypeVariable[type.getTypeArguments().length()];

         TypeMaker.getTypes(env, type.getTypeArguments(), res);

         return res;

     }

     /**

      * Return the type parameter tags of this class or interface.

      */

     public ParamTag[] typeParamTags() {

         return (env.legacyDoclet)

             ? new ParamTag[0]

             : comment().typeParamTags();

     }

     /**

      * Return the modifier string for this class. If it's an interface

      * exclude 'abstract' keyword from the modifier string

      */

     @Override

     public String modifiers() {

         return Modifier.toString(modifierSpecifier());

     }

     @Override

     public int modifierSpecifier() {

         int modifiers = getModifiers();

         return (isInterface() || isAnnotationType())

                 ? modifiers & ~Modifier.ABSTRACT

                 : modifiers;

     }

     /**

      * Return the superclass of this class

      *

      * @return the ClassDocImpl for the superclass of this class, null

      * if there is no superclass.

      */

     public ClassDoc superclass() {

         if (isInterface() || isAnnotationType()) return null;

         if (tsym == env.syms.objectType.tsym) return null;

         ClassSymbol c = (ClassSymbol)env.types.supertype(type).tsym;

         if (c == null || c == tsym) c = (ClassSymbol)env.syms.objectType.tsym;

         return env.getClassDoc(c);

     }

     /**

      * Return the superclass of this class.  Return null if this is an

      * interface.  A superclass is represented by either a

      * <code>ClassDoc</code> or a <code>ParameterizedType</code>.

      */

     public com.sun.javadoc.Type superclassType() {

         if (isInterface() || isAnnotationType() ||

                 (tsym == env.syms.objectType.tsym))

             return null;

         Type sup = env.types.supertype(type);

         return TypeMaker.getType(env,

                                  (sup != type) ? sup : env.syms.objectType);

     }

     /**

      * Test whether this class is a subclass of the specified class.

      *

      * @param cd the candidate superclass.

      * @return true if cd is a superclass of this class.

      */

     public boolean subclassOf(ClassDoc cd) {

         return tsym.isSubClass(((ClassDocImpl)cd).tsym, env.types);

     }

     /**

      * Return interfaces implemented by this class or interfaces

      * extended by this interface.

      *

      * @return An array of ClassDocImpl representing the interfaces.

      * Return an empty array if there are no interfaces.

      */

     public ClassDoc[] interfaces() {

         ListBuffer<ClassDocImpl> ta = new ListBuffer<ClassDocImpl>();

         for (Type t : env.types.interfaces(type)) {

             ta.append(env.getClassDoc((ClassSymbol)t.tsym));

         }

         //### Cache ta here?

         return ta.toArray(new ClassDocImpl[ta.length()]);

     }

     /**

      * Return interfaces implemented by this class or interfaces extended

      * by this interface. Includes only directly-declared interfaces, not

      * inherited interfaces.

      * Return an empty array if there are no interfaces.

      */

     public com.sun.javadoc.Type[] interfaceTypes() {

         //### Cache result here?

         return TypeMaker.getTypes(env, env.types.interfaces(type));

     }

     /**

      * Return fields in class.

      * @param filter include only the included fields if filter==true

      */

     public FieldDoc[] fields(boolean filter) {

         return fields(filter, false);

     }

     /**

      * Return included fields in class.

      */

     public FieldDoc[] fields() {

         return fields(true, false);

     }

     /**

      * Return the enum constants if this is an enum type.

      */

     public FieldDoc[] enumConstants() {

         return fields(false, true);

     }

     /**

      * Return fields in class.

      * @param filter  if true, return only the included fields

      * @param enumConstants  if true, return the enum constants instead

      */

     private FieldDoc[] fields(boolean filter, boolean enumConstants) {

         List<FieldDocImpl> fields = List.nil();

         for (Scope.Entry e = tsym.members().elems; e != null; e = e.sibling) {

             if (e.sym != null && e.sym.kind == VAR) {

                 VarSymbol s = (VarSymbol)e.sym;

                 boolean isEnum = ((s.flags() & Flags.ENUM) != 0) &&

                                  !env.legacyDoclet;

                 if (isEnum == enumConstants &&

                         (!filter || env.shouldDocument(s))) {

                     fields = fields.prepend(env.getFieldDoc(s));

                 }

             }

         }

         return fields.toArray(new FieldDocImpl[fields.length()]);

     }

     /**

      * Return methods in class.

      * This method is overridden by AnnotationTypeDocImpl.

      *

      * @param filter include only the included methods if filter==true

      * @return an array of MethodDocImpl for representing the visible

      * methods in this class.  Does not include constructors.

      */

     public MethodDoc[] methods(boolean filter) {

         Names names = tsym.name.table.names;

         List<MethodDocImpl> methods = List.nil();

         for (Scope.Entry e = tsym.members().elems; e != null; e = e.sibling) {

             if (e.sym != null &&

                 e.sym.kind == Kinds.MTH && e.sym.name != names.init) {

                 MethodSymbol s = (MethodSymbol)e.sym;

                 if (!filter || env.shouldDocument(s)) {

                     methods = methods.prepend(env.getMethodDoc(s));

                 }

             }

         }

         //### Cache methods here?

         return methods.toArray(new MethodDocImpl[methods.length()]);

     }

     /**

      * Return included methods in class.

      *

      * @return an array of MethodDocImpl for representing the visible

      * methods in this class.  Does not include constructors.

      */

     public MethodDoc[] methods() {

         return methods(true);

     }

     /**

      * Return constructors in class.

      *

      * @param filter include only the included constructors if filter==true

      * @return an array of ConstructorDocImpl for representing the visible

      * constructors in this class.

      */

     public ConstructorDoc[] constructors(boolean filter) {

         Names names = tsym.name.table.names;

         List<ConstructorDocImpl> constructors = List.nil();

         for (Scope.Entry e = tsym.members().elems; e != null; e = e.sibling) {

             if (e.sym != null &&

                 e.sym.kind == Kinds.MTH && e.sym.name == names.init) {

                 MethodSymbol s = (MethodSymbol)e.sym;

                 if (!filter || env.shouldDocument(s)) {

                     constructors = constructors.prepend(env.getConstructorDoc(s));

                 }

             }

         }

         //### Cache constructors here?

         return constructors.toArray(new ConstructorDocImpl[constructors.length()]);

     }

     /**

      * Return included constructors in class.

      *

      * @return an array of ConstructorDocImpl for representing the visible

      * constructors in this class.

      */

     public ConstructorDoc[] constructors() {

         return constructors(true);

     }

     /**

      * Adds all inner classes of this class, and their

      * inner classes recursively, to the list l.

      */

     void addAllClasses(ListBuffer<ClassDocImpl> l, boolean filtered) {

         try {

             if (isSynthetic()) return;

             // sometimes synthetic classes are not marked synthetic

             if (!JavadocTool.isValidClassName(tsym.name.toString())) return;

             if (filtered && !env.shouldDocument(tsym)) return;

             if (l.contains(this)) return;

             l.append(this);

             List<ClassDocImpl> more = List.nil();

             for (Scope.Entry e = tsym.members().elems; e != null;

                  e = e.sibling) {

                 if (e.sym != null && e.sym.kind == Kinds.TYP) {

                     ClassSymbol s = (ClassSymbol)e.sym;

                     ClassDocImpl c = env.getClassDoc(s);

                     if (c.isSynthetic()) continue;

                     if (c != null) more = more.prepend(c);

                 }

             }

             // this extra step preserves the ordering from oldjavadoc

             for (; more.nonEmpty(); more=more.tail) {

                 more.head.addAllClasses(l, filtered);

             }

         } catch (CompletionFailure e) {

             // quietly ignore completion failures

         }

     }

     /**

      * Return inner classes within this class.

      *

      * @param filter include only the included inner classes if filter==true.

      * @return an array of ClassDocImpl for representing the visible

      * classes defined in this class. Anonymous and local classes

      * are not included.

      */

     public ClassDoc[] innerClasses(boolean filter) {

         ListBuffer<ClassDocImpl> innerClasses = new ListBuffer<ClassDocImpl>();

         for (Scope.Entry e = tsym.members().elems; e != null; e = e.sibling) {

             if (e.sym != null && e.sym.kind == Kinds.TYP) {

                 ClassSymbol s = (ClassSymbol)e.sym;

                 if ((s.flags_field & Flags.SYNTHETIC) != 0) continue;

                 if (!filter || env.isVisible(s)) {

                     innerClasses.prepend(env.getClassDoc(s));

                 }

             }

         }

         //### Cache classes here?

         return innerClasses.toArray(new ClassDocImpl[innerClasses.length()]);

     }

     /**

      * Return included inner classes within this class.

      *

      * @return an array of ClassDocImpl for representing the visible

      * classes defined in this class. Anonymous and local classes

      * are not included.

      */

     public ClassDoc[] innerClasses() {

         return innerClasses(true);

     }

     /**

      * Find a class within the context of this class.

      * Search order: qualified name, in this class (inner),

      * in this package, in the class imports, in the package

      * imports.

      * Return the ClassDocImpl if found, null if not found.

      */

     //### The specified search order is not the normal rule the

     //### compiler would use.  Leave as specified or change it?

     public ClassDoc findClass(String className) {

         ClassDoc searchResult = searchClass(className);

         if (searchResult == null) {

             ClassDocImpl enclosingClass = (ClassDocImpl)containingClass();

             //Expand search space to include enclosing class.

             while (enclosingClass != null && enclosingClass.containingClass() != null) {

                 enclosingClass = (ClassDocImpl)enclosingClass.containingClass();

             }

             searchResult = enclosingClass == null ?

                 null : enclosingClass.searchClass(className);

         }

         return searchResult;

     }

     private ClassDoc searchClass(String className) {

         Names names = tsym.name.table.names;

         // search by qualified name first

         ClassDoc cd = env.lookupClass(className);

         if (cd != null) {

             return cd;

         }

         // search inner classes

         //### Add private entry point to avoid creating array?

         //### Replicate code in innerClasses here to avoid consing?

         for (ClassDoc icd : innerClasses()) {

             if (icd.name().equals(className) ||

                     //### This is from original javadoc but it looks suspicious to me...

                     //### I believe it is attempting to compensate for the confused

                     //### convention of including the nested class qualifiers in the

                     //### 'name' of the inner class, rather than the true simple name.

                     icd.name().endsWith("." + className)) {

                 return icd;

             } else {

                 ClassDoc innercd = ((ClassDocImpl) icd).searchClass(className);

                 if (innercd != null) {

                     return innercd;

                 }

             }

         }

         // check in this package

         cd = containingPackage().findClass(className);

         if (cd != null) {

             return cd;

         }

         // make sure that this symbol has been completed

         if (tsym.completer != null) {

             tsym.complete();

         }

         // search imports

         if (tsym.sourcefile != null) {

             //### This information is available only for source classes.

             Env<AttrContext> compenv = env.enter.getEnv(tsym);

             if (compenv == null) return null;

             Scope s = compenv.toplevel.namedImportScope;

             for (Scope.Entry e = s.lookup(names.fromString(className)); e.scope != null; e = e.next()) {

                 if (e.sym.kind == Kinds.TYP) {

                     ClassDoc c = env.getClassDoc((ClassSymbol)e.sym);

                     return c;

                 }

             }

             s = compenv.toplevel.starImportScope;

             for (Scope.Entry e = s.lookup(names.fromString(className)); e.scope != null; e = e.next()) {

                 if (e.sym.kind == Kinds.TYP) {

                     ClassDoc c = env.getClassDoc((ClassSymbol)e.sym);

                     return c;

                 }

             }

         }

         return null; // not found

     }

     private boolean hasParameterTypes(MethodSymbol method, String[] argTypes) {

         if (argTypes == null) {

             // wildcard

             return true;

         }

         int i = 0;

         List<Type> types = method.type.getParameterTypes();

         if (argTypes.length != types.length()) {

             return false;

         }

         for (Type t : types) {

             String argType = argTypes[i++];

             // For vararg method, "T..." matches type T[].

             if (i == argTypes.length) {

                 argType = argType.replace("...", "[]");

             }

             if (!hasTypeName(env.types.erasure(t), argType)) {  //###(gj)

                 return false;

             }

         }

         return true;

     }

     // where

     private boolean hasTypeName(Type t, String name) {

         return

             name.equals(TypeMaker.getTypeName(t, true))

             ||

             name.equals(TypeMaker.getTypeName(t, false))

             ||

             (qualifiedName() + "." + name).equals(TypeMaker.getTypeName(t, true));

     }

     /**

      * Find a method in this class scope.

      * Search order: this class, interfaces, superclasses, outerclasses.

      * Note that this is not necessarily what the compiler would do!

      *

      * @param methodName the unqualified name to search for.

      * @param paramTypeArray the array of Strings for method parameter types.

      * @return the first MethodDocImpl which matches, null if not found.

      */

     public MethodDocImpl findMethod(String methodName, String[] paramTypes) {

         // Use hash table 'searched' to avoid searching same class twice.

         //### It is not clear how this could happen.

         return searchMethod(methodName, paramTypes, new HashSet<ClassDocImpl>());

     }

     private MethodDocImpl searchMethod(String methodName,

                                        String[] paramTypes, Set<ClassDocImpl> searched) {

         //### Note that this search is not necessarily what the compiler would do!

         Names names = tsym.name.table.names;

         // do not match constructors

         if (names.init.contentEquals(methodName)) {

             return null;

         }

         ClassDocImpl cdi;

         MethodDocImpl mdi;

         if (searched.contains(this)) {

             return null;

         }

         searched.add(this);

         //DEBUG

         /*---------------------------------*

          System.out.print("searching " + this + " for " + methodName);

          if (paramTypes == null) {

          System.out.println("()");

          } else {

          System.out.print("(");

          for (int k=0; k < paramTypes.length; k++) {

          System.out.print(paramTypes[k]);

          if ((k + 1) < paramTypes.length) {

          System.out.print(", ");

          }

          }

          System.out.println(")");

          }

          *---------------------------------*/

         // search current class

         Scope.Entry e = tsym.members().lookup(names.fromString(methodName));

         //### Using modifier filter here isn't really correct,

         //### but emulates the old behavior.  Instead, we should

         //### apply the normal rules of visibility and inheritance.

         if (paramTypes == null) {

             // If no parameters specified, we are allowed to return

             // any method with a matching name.  In practice, the old

             // code returned the first method, which is now the last!

             // In order to provide textually identical results, we

             // attempt to emulate the old behavior.

             MethodSymbol lastFound = null;

             for (; e.scope != null; e = e.next()) {

                 if (e.sym.kind == Kinds.MTH) {

                     //### Should intern methodName as Name.

                     if (e.sym.name.toString().equals(methodName)) {

                         lastFound = (MethodSymbol)e.sym;

                     }

                 }

             }

             if (lastFound != null) {

                 return env.getMethodDoc(lastFound);

             }

         } else {

             for (; e.scope != null; e = e.next()) {

                 if (e.sym != null &&

                     e.sym.kind == Kinds.MTH) {

                     //### Should intern methodName as Name.

                     if (hasParameterTypes((MethodSymbol)e.sym, paramTypes)) {

                         return env.getMethodDoc((MethodSymbol)e.sym);

                     }

                 }

             }

         }

         //### If we found a MethodDoc above, but which did not pass

         //### the modifier filter, we should return failure here!

         // search superclass

         cdi = (ClassDocImpl)superclass();

         if (cdi != null) {

             mdi = cdi.searchMethod(methodName, paramTypes, searched);

             if (mdi != null) {

                 return mdi;

             }

         }

         // search interfaces

         ClassDoc intf[] = interfaces();

         for (int i = 0; i < intf.length; i++) {

             cdi = (ClassDocImpl)intf[i];

             mdi = cdi.searchMethod(methodName, paramTypes, searched);

             if (mdi != null) {

                 return mdi;

             }

         }

         // search enclosing class

         cdi = (ClassDocImpl)containingClass();

         if (cdi != null) {

             mdi = cdi.searchMethod(methodName, paramTypes, searched);

             if (mdi != null) {

                 return mdi;

             }

         }

         //###(gj) As a temporary measure until type variables are better

         //### handled, try again without the parameter types.

         //### This should most often find the right method, and occassionally

         //### find the wrong one.

         //if (paramTypes != null) {

         //    return findMethod(methodName, null);

         //}

         return null;

     }

     /**

      * Find constructor in this class.

      *

      * @param constrName the unqualified name to search for.

      * @param paramTypeArray the array of Strings for constructor parameters.

      * @return the first ConstructorDocImpl which matches, null if not found.

      */

     public ConstructorDoc findConstructor(String constrName,

                                           String[] paramTypes) {

         Names names = tsym.name.table.names;

         for (Scope.Entry e = tsym.members().lookup(names.fromString("<init>")); e.scope != null; e = e.next()) {

             if (e.sym.kind == Kinds.MTH) {

                 if (hasParameterTypes((MethodSymbol)e.sym, paramTypes)) {

                     return env.getConstructorDoc((MethodSymbol)e.sym);

                 }

             }

         }

         //###(gj) As a temporary measure until type variables are better

         //### handled, try again without the parameter types.

         //### This will often find the right constructor, and occassionally

         //### find the wrong one.

         //if (paramTypes != null) {

         //    return findConstructor(constrName, null);

         //}

         return null;

     }

     /**

      * Find a field in this class scope.

      * Search order: this class, outerclasses, interfaces,

      * superclasses. IMP: If see tag is defined in an inner class,

      * which extends a super class and if outerclass and the super

      * class have a visible field in common then Java compiler cribs

      * about the ambiguity, but the following code will search in the

      * above given search order.

      *

      * @param fieldName the unqualified name to search for.

      * @return the first FieldDocImpl which matches, null if not found.

      */

     public FieldDoc findField(String fieldName) {

         return searchField(fieldName, new HashSet<ClassDocImpl>());

     }

     private FieldDocImpl searchField(String fieldName, Set<ClassDocImpl> searched) {

         Names names = tsym.name.table.names;

         if (searched.contains(this)) {

             return null;

         }

         searched.add(this);

         for (Scope.Entry e = tsym.members().lookup(names.fromString(fieldName)); e.scope != null; e = e.next()) {

             if (e.sym.kind == Kinds.VAR) {

                 //### Should intern fieldName as Name.

                 return env.getFieldDoc((VarSymbol)e.sym);

             }

         }

         //### If we found a FieldDoc above, but which did not pass

         //### the modifier filter, we should return failure here!

         ClassDocImpl cdi = (ClassDocImpl)containingClass();

         if (cdi != null) {

             FieldDocImpl fdi = cdi.searchField(fieldName, searched);

             if (fdi != null) {

                 return fdi;

             }

         }

         // search superclass

         cdi = (ClassDocImpl)superclass();

         if (cdi != null) {

             FieldDocImpl fdi = cdi.searchField(fieldName, searched);

             if (fdi != null) {

                 return fdi;

             }

         }

         // search interfaces

         ClassDoc intf[] = interfaces();

         for (int i = 0; i < intf.length; i++) {

             cdi = (ClassDocImpl)intf[i];

             FieldDocImpl fdi = cdi.searchField(fieldName, searched);

             if (fdi != null) {

                 return fdi;

             }

         }

         return null;

     }

     /**

      * Get the list of classes declared as imported.

      * These are called "single-type-import declarations" in the JLS.

      * This method is deprecated in the ClassDoc interface.

      *

      * @return an array of ClassDocImpl representing the imported classes.

      *

      * @deprecated  Import declarations are implementation details that

      *          should not be exposed here.  In addition, not all imported

      *          classes are imported through single-type-import declarations.

      */

     @Deprecated

     public ClassDoc[] importedClasses() {

         // information is not available for binary classfiles

         if (tsym.sourcefile == null) return new ClassDoc[0];

         ListBuffer<ClassDocImpl> importedClasses = new ListBuffer<ClassDocImpl>();

         Env<AttrContext> compenv = env.enter.getEnv(tsym);

         if (compenv == null) return new ClassDocImpl[0];

         Name asterisk = tsym.name.table.names.asterisk;

         for (JCTree t : compenv.toplevel.defs) {

             if (t.hasTag(IMPORT)) {

                 JCTree imp = ((JCImport) t).qualid;

                 if ((TreeInfo.name(imp) != asterisk) &&

                         (imp.type.tsym.kind & Kinds.TYP) != 0) {

                     importedClasses.append(

                             env.getClassDoc((ClassSymbol)imp.type.tsym));

                 }

             }

         }

         return importedClasses.toArray(new ClassDocImpl[importedClasses.length()]);

     }

     /**

      * Get the list of packages declared as imported.

      * These are called "type-import-on-demand declarations" in the JLS.

      * This method is deprecated in the ClassDoc interface.

      *

      * @return an array of PackageDocImpl representing the imported packages.

      *

      * ###NOTE: the syntax supports importing all inner classes from a class as well.

      * @deprecated  Import declarations are implementation details that

      *          should not be exposed here.  In addition, this method's

      *          return type does not allow for all type-import-on-demand

      *          declarations to be returned.

      */

     @Deprecated

     public PackageDoc[] importedPackages() {

         // information is not available for binary classfiles

         if (tsym.sourcefile == null) return new PackageDoc[0];

         ListBuffer<PackageDocImpl> importedPackages = new ListBuffer<PackageDocImpl>();

         //### Add the implicit "import java.lang.*" to the result

         Names names = tsym.name.table.names;

         importedPackages.append(env.getPackageDoc(env.reader.enterPackage(names.java_lang)));

         Env<AttrContext> compenv = env.enter.getEnv(tsym);

         if (compenv == null) return new PackageDocImpl[0];

         for (JCTree t : compenv.toplevel.defs) {

             if (t.hasTag(IMPORT)) {

                 JCTree imp = ((JCImport) t).qualid;

                 if (TreeInfo.name(imp) == names.asterisk) {

                     JCFieldAccess sel = (JCFieldAccess)imp;

                     Symbol s = sel.selected.type.tsym;

                     PackageDocImpl pdoc = env.getPackageDoc(s.packge());

                     if (!importedPackages.contains(pdoc))

                         importedPackages.append(pdoc);

                 }

             }

         }

         return importedPackages.toArray(new PackageDocImpl[importedPackages.length()]);

     }

     /**

      * Return the type's dimension information.

      * Always return "", as this is not an array type.

      */

     public String dimension() {

         return "";

     }

     /**

      * Return this type as a class, which it already is.

      */

     public ClassDoc asClassDoc() {

         return this;

     }

     /**

      * Return null (unless overridden), as this is not an annotation type.

      */

     public AnnotationTypeDoc asAnnotationTypeDoc() {

         return null;

     }

     /**

      * Return null, as this is not a class instantiation.

      */

     public ParameterizedType asParameterizedType() {

         return null;

     }

     /**

      * Return null, as this is not a type variable.

      */

     public TypeVariable asTypeVariable() {

         return null;

     }

     /**

      * Return null, as this is not a wildcard type.

      */

     public WildcardType asWildcardType() {

         return null;

     }

     /**

      * Return false, as this is not a primitive type.

      */

     public boolean isPrimitive() {

         return false;

     }

     //--- Serialization ---

     //### These methods ignore modifier filter.

     /**

      * Return true if this class implements <code>java.io.Serializable</code>.

      *

      * Since <code>java.io.Externalizable</code> extends

      * <code>java.io.Serializable</code>,

      * Externalizable objects are also Serializable.

      */

     public boolean isSerializable() {

         try {

             return env.types.isSubtype(type, env.syms.serializableType);

         } catch (CompletionFailure ex) {

             // quietly ignore completion failures

             return false;

         }

     }

     /**

      * Return true if this class implements

      * <code>java.io.Externalizable</code>.

      */

     public boolean isExternalizable() {

         try {

             return env.types.isSubtype(type, env.externalizableSym.type);

         } catch (CompletionFailure ex) {

             // quietly ignore completion failures

             return false;

         }

     }

     /**

      * Return the serialization methods for this class.

      *

      * @return an array of <code>MethodDocImpl</code> that represents

      * the serialization methods for this class.

      */

     public MethodDoc[] serializationMethods() {

         if (serializedForm == null) {

             serializedForm = new SerializedForm(env, tsym, this);

         }

         //### Clone this?

         return serializedForm.methods();

     }

     /**

      * Return the Serializable fields of class.<p>

      *

      * Return either a list of default fields documented by

      * <code>serial</code> tag<br>

      * or return a single <code>FieldDoc</code> for

      * <code>serialPersistentField</code> member.

      * There should be a <code>serialField</code> tag for

      * each Serializable field defined by an <code>ObjectStreamField</code>

      * array component of <code>serialPersistentField</code>.

      *

      * @returns an array of <code>FieldDoc</code> for the Serializable fields

      * of this class.

      *

      * @see #definesSerializableFields()

      * @see SerialFieldTagImpl

      */

     public FieldDoc[] serializableFields() {

         if (serializedForm == null) {

             serializedForm = new SerializedForm(env, tsym, this);

         }

         //### Clone this?

         return serializedForm.fields();

     }

     /**

      * Return true if Serializable fields are explicitly defined with

      * the special class member <code>serialPersistentFields</code>.

      *

      * @see #serializableFields()

      * @see SerialFieldTagImpl

      */

     public boolean definesSerializableFields() {

         if (!isSerializable() || isExternalizable()) {

             return false;

         } else {

             if (serializedForm == null) {

                 serializedForm = new SerializedForm(env, tsym, this);

             }

             //### Clone this?

             return serializedForm.definesSerializableFields();

         }

     }

     /**

      * Determine if a class is a RuntimeException.

      * <p>

      * Used only by ThrowsTagImpl.

      */

     boolean isRuntimeException() {

         return tsym.isSubClass(env.syms.runtimeExceptionType.tsym, env.types);

     }

     /**

      * Return the source position of the entity, or null if

      * no position is available.

      */

     @Override

     public SourcePosition position() {

         if (tsym.sourcefile == null) return null;

         return SourcePositionImpl.make(tsym.sourcefile,

                                        (tree==null) ? Position.NOPOS : tree.pos,

                                        lineMap);

     }

 }