Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * 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.lang.reflect.Modifier;

 import com.sun.javadoc.*;

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

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

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

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

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

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

 /**

  * Represents a method of a java class.

  *

  *  <p><b>This is NOT part of any supported API.

  *  If you write code that depends on this, you do so at your own risk.

  *  This code and its internal interfaces are subject to change or

  *  deletion without notice.</b>

  *

  * @since 1.2

  * @author Robert Field

  * @author Neal Gafter (rewrite)

  */

 public class MethodDocImpl

         extends ExecutableMemberDocImpl implements MethodDoc {

     /**

      * constructor.

      */

     public MethodDocImpl(DocEnv env, MethodSymbol sym) {

         super(env, sym);

     }

     /**

      * constructor.

      */

     public MethodDocImpl(DocEnv env, MethodSymbol sym,

                          String docComment, JCMethodDecl tree, Position.LineMap lineMap) {

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

     }

     /**

      * Return true if it is a method, which it is.

      * Note: constructors are not methods.

      * This method is overridden by AnnotationTypeElementDocImpl.

      *

      * @return true

      */

     public boolean isMethod() {

         return true;

     }

     /**

      * Return true if this method is abstract

      */

     public boolean isAbstract() {

         //### This is dubious, but old 'javadoc' apparently does it.

         //### I regard this as a bug and an obstacle to treating the

         //### doclet API as a proper compile-time reflection facility.

         //### (maddox 09/26/2000)

         if (containingClass().isInterface()) {

             //### Don't force creation of ClassDocImpl for super here.

             // Abstract modifier is implicit.  Strip/canonicalize it.

             return false;

         }

         return Modifier.isAbstract(getModifiers());

     }

     /**

      * Get return type.

      *

      * @return the return type of this method, null if it

      * is a constructor.

      */

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

         return TypeMaker.getType(env, sym.type.getReturnType(), false);

     }

     /**

      * Return the class that originally defined the method that

      * is overridden by the current definition, or null if no

      * such class exists.

      *

      * @return a ClassDocImpl representing the superclass that

      * originally defined this method, null if this method does

      * not override a definition in a superclass.

      */

     public ClassDoc overriddenClass() {

         com.sun.javadoc.Type t = overriddenType();

         return (t != null) ? t.asClassDoc() : null;

     }

     /**

      * Return the type containing the method that this method overrides.

      * It may be a <code>ClassDoc</code> or a <code>ParameterizedType</code>.

      */

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

         if ((sym.flags() & Flags.STATIC) != 0) {

             return null;

         }

         ClassSymbol origin = (ClassSymbol)sym.owner;

         for (Type t = env.types.supertype(origin.type);

              t.tag == TypeTags.CLASS;

              t = env.types.supertype(t)) {

             ClassSymbol c = (ClassSymbol)t.tsym;

             for (Scope.Entry e = c.members().lookup(sym.name); e.scope != null; e = e.next()) {

                 if (sym.overrides(e.sym, origin, env.types, true)) {

                     return TypeMaker.getType(env, t);

                 }

             }

         }

         return null;

     }

     /**

      * Return the method that this method overrides.

      *

      * @return a MethodDoc representing a method definition

      * in a superclass this method overrides, null if

      * this method does not override.

      */

     public MethodDoc overriddenMethod() {

         // Real overriding only.  Static members are simply hidden.

         // Likewise for constructors, but the MethodSymbol.overrides

         // method takes this into account.

         if ((sym.flags() & Flags.STATIC) != 0) {

             return null;

         }

         // Derived from  com.sun.tools.javac.comp.Check.checkOverride .

         ClassSymbol origin = (ClassSymbol)sym.owner;

         for (Type t = env.types.supertype(origin.type);

              t.tag == TypeTags.CLASS;

              t = env.types.supertype(t)) {

             ClassSymbol c = (ClassSymbol)t.tsym;

             for (Scope.Entry e = c.members().lookup(sym.name); e.scope != null; e = e.next()) {

                 if (sym.overrides(e.sym, origin, env.types, true)) {

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

                 }

             }

         }

         return null;

     }

     /**

      * Tests whether this method overrides another.

      * The overridden method may be one declared in a superclass or

      * a superinterface (unlike {@link #overriddenMethod()}).

      *

      * <p> When a non-abstract method overrides an abstract one, it is

      * also said to <i>implement</i> the other.

      *

      * @param meth  the other method to examine

      * @return <tt>true</tt> if this method overrides the other

      */

     public boolean overrides(MethodDoc meth) {

         MethodSymbol overridee = ((MethodDocImpl) meth).sym;

         ClassSymbol origin = (ClassSymbol) sym.owner;

         return sym.name == overridee.name &&

                // not reflexive as per JLS

                sym != overridee &&

                // we don't care if overridee is static, though that wouldn't

                // compile

                !sym.isStatic() &&

                // sym, whose declaring type is the origin, must be

                // in a subtype of overridee's type

                env.types.asSuper(origin.type, overridee.owner) != null &&

                // check access and signatures; don't check return types

                sym.overrides(overridee, origin, env.types, false);

     }

     public String name() {

         return sym.name.toString();

     }

     public String qualifiedName() {

         return sym.enclClass().getQualifiedName() + "." + sym.name;

     }

     /**

      * Returns a string representation of this method.  Includes the

      * qualified signature, the qualified method name, and any type

      * parameters.  Type parameters follow the class name, as they do

      * in the syntax for invoking methods with explicit type parameters.

      */

     public String toString() {

         return sym.enclClass().getQualifiedName() +

                 "." + typeParametersString() + name() + signature();

     }

 }