aoqi@0: /*
aoqi@0:  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.tools.javac.model;
aoqi@0: 
aoqi@0: import java.util.Collections;
aoqi@0: import java.util.EnumSet;
aoqi@0: import java.util.LinkedHashSet;
aoqi@0: import java.util.List;
aoqi@0: import java.util.Set;
aoqi@0: 
aoqi@0: import javax.lang.model.element.*;
aoqi@0: import javax.lang.model.type.*;
aoqi@0: 
aoqi@0: import com.sun.tools.javac.code.*;
aoqi@0: import com.sun.tools.javac.code.Symbol.*;
aoqi@0: import com.sun.tools.javac.util.*;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Utility methods for operating on types.
aoqi@0:  *
aoqi@0:  * <p><b>This is NOT part of any supported API.
aoqi@0:  * If you write code that depends on this, you do so at your own
aoqi@0:  * risk.  This code and its internal interfaces are subject to change
aoqi@0:  * or deletion without notice.</b></p>
aoqi@0:  */
aoqi@0: public class JavacTypes implements javax.lang.model.util.Types {
aoqi@0: 
aoqi@0:     private Symtab syms;
aoqi@0:     private Types types;
aoqi@0: 
aoqi@0:     public static JavacTypes instance(Context context) {
aoqi@0:         JavacTypes instance = context.get(JavacTypes.class);
aoqi@0:         if (instance == null)
aoqi@0:             instance = new JavacTypes(context);
aoqi@0:         return instance;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Public for use only by JavacProcessingEnvironment
aoqi@0:      */
aoqi@0:     protected JavacTypes(Context context) {
aoqi@0:         setContext(context);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Use a new context.  May be called from outside to update
aoqi@0:      * internal state for a new annotation-processing round.
aoqi@0:      */
aoqi@0:     public void setContext(Context context) {
aoqi@0:         context.put(JavacTypes.class, this);
aoqi@0:         syms = Symtab.instance(context);
aoqi@0:         types = Types.instance(context);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Element asElement(TypeMirror t) {
aoqi@0:         switch (t.getKind()) {
aoqi@0:             case DECLARED:
aoqi@0:             case INTERSECTION:
aoqi@0:             case ERROR:
aoqi@0:             case TYPEVAR:
aoqi@0:                 Type type = cast(Type.class, t);
aoqi@0:                 return type.asElement();
aoqi@0:             default:
aoqi@0:                 return null;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isSameType(TypeMirror t1, TypeMirror t2) {
aoqi@0:         return types.isSameType((Type) t1, (Type) t2);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isSubtype(TypeMirror t1, TypeMirror t2) {
aoqi@0:         validateTypeNotIn(t1, EXEC_OR_PKG);
aoqi@0:         validateTypeNotIn(t2, EXEC_OR_PKG);
aoqi@0:         return types.isSubtype((Type) t1, (Type) t2);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isAssignable(TypeMirror t1, TypeMirror t2) {
aoqi@0:         validateTypeNotIn(t1, EXEC_OR_PKG);
aoqi@0:         validateTypeNotIn(t2, EXEC_OR_PKG);
aoqi@0:         return types.isAssignable((Type) t1, (Type) t2);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean contains(TypeMirror t1, TypeMirror t2) {
aoqi@0:         validateTypeNotIn(t1, EXEC_OR_PKG);
aoqi@0:         validateTypeNotIn(t2, EXEC_OR_PKG);
aoqi@0:         return types.containsType((Type) t1, (Type) t2);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isSubsignature(ExecutableType m1, ExecutableType m2) {
aoqi@0:         return types.isSubSignature((Type) m1, (Type) m2);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public List<Type> directSupertypes(TypeMirror t) {
aoqi@0:         validateTypeNotIn(t, EXEC_OR_PKG);
aoqi@0:         return types.directSupertypes((Type) t);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror erasure(TypeMirror t) {
aoqi@0:         if (t.getKind() == TypeKind.PACKAGE)
aoqi@0:             throw new IllegalArgumentException(t.toString());
aoqi@0:         return types.erasure((Type) t);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeElement boxedClass(PrimitiveType p) {
aoqi@0:         return types.boxedClass((Type) p);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public PrimitiveType unboxedType(TypeMirror t) {
aoqi@0:         if (t.getKind() != TypeKind.DECLARED)
aoqi@0:             throw new IllegalArgumentException(t.toString());
aoqi@0:         Type unboxed = types.unboxedType((Type) t);
aoqi@0:         if (! unboxed.isPrimitive())    // only true primitives, not void
aoqi@0:             throw new IllegalArgumentException(t.toString());
aoqi@0:         return (PrimitiveType)unboxed;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror capture(TypeMirror t) {
aoqi@0:         validateTypeNotIn(t, EXEC_OR_PKG);
aoqi@0:         return types.capture((Type) t);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public PrimitiveType getPrimitiveType(TypeKind kind) {
aoqi@0:         switch (kind) {
aoqi@0:         case BOOLEAN:   return syms.booleanType;
aoqi@0:         case BYTE:      return syms.byteType;
aoqi@0:         case SHORT:     return syms.shortType;
aoqi@0:         case INT:       return syms.intType;
aoqi@0:         case LONG:      return syms.longType;
aoqi@0:         case CHAR:      return syms.charType;
aoqi@0:         case FLOAT:     return syms.floatType;
aoqi@0:         case DOUBLE:    return syms.doubleType;
aoqi@0:         default:
aoqi@0:             throw new IllegalArgumentException("Not a primitive type: " + kind);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public NullType getNullType() {
aoqi@0:         return (NullType) syms.botType;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public NoType getNoType(TypeKind kind) {
aoqi@0:         switch (kind) {
aoqi@0:         case VOID:      return syms.voidType;
aoqi@0:         case NONE:      return Type.noType;
aoqi@0:         default:
aoqi@0:             throw new IllegalArgumentException(kind.toString());
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public ArrayType getArrayType(TypeMirror componentType) {
aoqi@0:         switch (componentType.getKind()) {
aoqi@0:         case VOID:
aoqi@0:         case EXECUTABLE:
aoqi@0:         case WILDCARD:  // heh!
aoqi@0:         case PACKAGE:
aoqi@0:             throw new IllegalArgumentException(componentType.toString());
aoqi@0:         }
aoqi@0:         return new Type.ArrayType((Type) componentType, syms.arrayClass);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public WildcardType getWildcardType(TypeMirror extendsBound,
aoqi@0:                                         TypeMirror superBound) {
aoqi@0:         BoundKind bkind;
aoqi@0:         Type bound;
aoqi@0:         if (extendsBound == null && superBound == null) {
aoqi@0:             bkind = BoundKind.UNBOUND;
aoqi@0:             bound = syms.objectType;
aoqi@0:         } else if (superBound == null) {
aoqi@0:             bkind = BoundKind.EXTENDS;
aoqi@0:             bound = (Type) extendsBound;
aoqi@0:         } else if (extendsBound == null) {
aoqi@0:             bkind = BoundKind.SUPER;
aoqi@0:             bound = (Type) superBound;
aoqi@0:         } else {
aoqi@0:             throw new IllegalArgumentException(
aoqi@0:                     "Extends and super bounds cannot both be provided");
aoqi@0:         }
aoqi@0:         switch (bound.getKind()) {
aoqi@0:         case ARRAY:
aoqi@0:         case DECLARED:
aoqi@0:         case ERROR:
aoqi@0:         case TYPEVAR:
aoqi@0:             return new Type.WildcardType(bound, bkind, syms.boundClass);
aoqi@0:         default:
aoqi@0:             throw new IllegalArgumentException(bound.toString());
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public DeclaredType getDeclaredType(TypeElement typeElem,
aoqi@0:                                         TypeMirror... typeArgs) {
aoqi@0:         ClassSymbol sym = (ClassSymbol) typeElem;
aoqi@0: 
aoqi@0:         if (typeArgs.length == 0)
aoqi@0:             return (DeclaredType) sym.erasure(types);
aoqi@0:         if (sym.type.getEnclosingType().isParameterized())
aoqi@0:             throw new IllegalArgumentException(sym.toString());
aoqi@0: 
aoqi@0:         return getDeclaredType0(sym.type.getEnclosingType(), sym, typeArgs);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public DeclaredType getDeclaredType(DeclaredType enclosing,
aoqi@0:                                         TypeElement typeElem,
aoqi@0:                                         TypeMirror... typeArgs) {
aoqi@0:         if (enclosing == null)
aoqi@0:             return getDeclaredType(typeElem, typeArgs);
aoqi@0: 
aoqi@0:         ClassSymbol sym = (ClassSymbol) typeElem;
aoqi@0:         Type outer = (Type) enclosing;
aoqi@0: 
aoqi@0:         if (outer.tsym != sym.owner.enclClass())
aoqi@0:             throw new IllegalArgumentException(enclosing.toString());
aoqi@0:         if (!outer.isParameterized())
aoqi@0:             return getDeclaredType(typeElem, typeArgs);
aoqi@0: 
aoqi@0:         return getDeclaredType0(outer, sym, typeArgs);
aoqi@0:     }
aoqi@0:     // where
aoqi@0:         private DeclaredType getDeclaredType0(Type outer,
aoqi@0:                                               ClassSymbol sym,
aoqi@0:                                               TypeMirror... typeArgs) {
aoqi@0:             if (typeArgs.length != sym.type.getTypeArguments().length())
aoqi@0:                 throw new IllegalArgumentException(
aoqi@0:                 "Incorrect number of type arguments");
aoqi@0: 
aoqi@0:             ListBuffer<Type> targs = new ListBuffer<Type>();
aoqi@0:             for (TypeMirror t : typeArgs) {
aoqi@0:                 if (!(t instanceof ReferenceType || t instanceof WildcardType))
aoqi@0:                     throw new IllegalArgumentException(t.toString());
aoqi@0:                 targs.append((Type) t);
aoqi@0:             }
aoqi@0:             // TODO: Would like a way to check that type args match formals.
aoqi@0: 
aoqi@0:             return (DeclaredType) new Type.ClassType(outer, targs.toList(), sym);
aoqi@0:         }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Returns the type of an element when that element is viewed as
aoqi@0:      * a member of, or otherwise directly contained by, a given type.
aoqi@0:      * For example,
aoqi@0:      * when viewed as a member of the parameterized type {@code Set<String>},
aoqi@0:      * the {@code Set.add} method is an {@code ExecutableType}
aoqi@0:      * whose parameter is of type {@code String}.
aoqi@0:      *
aoqi@0:      * @param containing  the containing type
aoqi@0:      * @param element     the element
aoqi@0:      * @return the type of the element as viewed from the containing type
aoqi@0:      * @throws IllegalArgumentException if the element is not a valid one
aoqi@0:      *          for the given type
aoqi@0:      */
aoqi@0:     public TypeMirror asMemberOf(DeclaredType containing, Element element) {
aoqi@0:         Type site = (Type)containing;
aoqi@0:         Symbol sym = (Symbol)element;
aoqi@0:         if (types.asSuper(site, sym.getEnclosingElement()) == null)
aoqi@0:             throw new IllegalArgumentException(sym + "@" + site);
aoqi@0:         return types.memberType(site, sym);
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     private static final Set<TypeKind> EXEC_OR_PKG =
aoqi@0:             EnumSet.of(TypeKind.EXECUTABLE, TypeKind.PACKAGE);
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Throws an IllegalArgumentException if a type's kind is one of a set.
aoqi@0:      */
aoqi@0:     private void validateTypeNotIn(TypeMirror t, Set<TypeKind> invalidKinds) {
aoqi@0:         if (invalidKinds.contains(t.getKind()))
aoqi@0:             throw new IllegalArgumentException(t.toString());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Returns an object cast to the specified type.
aoqi@0:      * @throws NullPointerException if the object is {@code null}
aoqi@0:      * @throws IllegalArgumentException if the object is of the wrong type
aoqi@0:      */
aoqi@0:     private static <T> T cast(Class<T> clazz, Object o) {
aoqi@0:         if (! clazz.isInstance(o))
aoqi@0:             throw new IllegalArgumentException(o.toString());
aoqi@0:         return clazz.cast(o);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Set<MethodSymbol> getOverriddenMethods(Element elem) {
aoqi@0:         if (elem.getKind() != ElementKind.METHOD
aoqi@0:                 || elem.getModifiers().contains(Modifier.STATIC)
aoqi@0:                 || elem.getModifiers().contains(Modifier.PRIVATE))
aoqi@0:             return Collections.emptySet();
aoqi@0: 
aoqi@0:         if (!(elem instanceof MethodSymbol))
aoqi@0:             throw new IllegalArgumentException();
aoqi@0: 
aoqi@0:         MethodSymbol m = (MethodSymbol) elem;
aoqi@0:         ClassSymbol origin = (ClassSymbol) m.owner;
aoqi@0: 
aoqi@0:         Set<MethodSymbol> results = new LinkedHashSet<MethodSymbol>();
aoqi@0:         for (Type t : types.closure(origin.type)) {
aoqi@0:             if (t != origin.type) {
aoqi@0:                 ClassSymbol c = (ClassSymbol) t.tsym;
aoqi@0:                 for (Scope.Entry e = c.members().lookup(m.name); e.scope != null; e = e.next()) {
aoqi@0:                     if (e.sym.kind == Kinds.MTH && m.overrides(e.sym, origin, types, true)) {
aoqi@0:                         results.add((MethodSymbol) e.sym);
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         return results;
aoqi@0:     }
aoqi@0: }