aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 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.internal.jxc.model.nav;
aoqi@0: 
aoqi@0: import com.sun.source.tree.CompilationUnitTree;
aoqi@0: import com.sun.source.util.TreePath;
aoqi@0: import com.sun.source.util.Trees;
aoqi@0: import com.sun.xml.internal.bind.v2.model.nav.Navigator;
aoqi@0: import com.sun.xml.internal.bind.v2.runtime.Location;
aefimov@835: import java.lang.annotation.Annotation;
aefimov@835: import java.util.ArrayList;
aefimov@835: import java.util.Collection;
aefimov@835: import java.util.HashMap;
aefimov@835: import java.util.List;
aefimov@835: import java.util.Map;
aoqi@0: import javax.annotation.processing.ProcessingEnvironment;
aoqi@0: import javax.lang.model.element.AnnotationMirror;
aoqi@0: import javax.lang.model.element.Element;
aoqi@0: import javax.lang.model.element.ElementKind;
aoqi@0: import javax.lang.model.element.ExecutableElement;
aoqi@0: import javax.lang.model.element.Modifier;
aoqi@0: import javax.lang.model.element.TypeElement;
aoqi@0: import javax.lang.model.element.TypeParameterElement;
aoqi@0: import javax.lang.model.element.VariableElement;
aoqi@0: import javax.lang.model.type.ArrayType;
aoqi@0: import javax.lang.model.type.DeclaredType;
aoqi@0: import javax.lang.model.type.PrimitiveType;
aoqi@0: import javax.lang.model.type.TypeKind;
aoqi@0: import javax.lang.model.type.TypeMirror;
aoqi@0: import javax.lang.model.type.TypeVariable;
aoqi@0: import javax.lang.model.type.TypeVisitor;
aoqi@0: import javax.lang.model.type.WildcardType;
aoqi@0: import javax.lang.model.util.ElementFilter;
aoqi@0: import javax.lang.model.util.Elements;
aoqi@0: import javax.lang.model.util.SimpleTypeVisitor6;
aoqi@0: import javax.lang.model.util.Types;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * {@link Navigator} implementation for annotation processing.
aoqi@0:  * TODO: check the spec on how generics are supposed to be handled
aoqi@0:  *
aoqi@0:  * @author Kohsuke Kawaguchi (kk@kohsuke.org)
aoqi@0:  */
aoqi@0: public final class ApNavigator implements Navigator<TypeMirror, TypeElement, VariableElement, ExecutableElement> {
aoqi@0: 
aoqi@0:     private final ProcessingEnvironment env;
aoqi@0: 
aoqi@0:     private final PrimitiveType primitiveByte;
aoqi@0: 
aoqi@0:     public ApNavigator(ProcessingEnvironment env) {
aoqi@0:         this.env = env;
aoqi@0:         this.primitiveByte = env.getTypeUtils().getPrimitiveType(TypeKind.BYTE);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeElement getSuperClass(TypeElement typeElement) {
aoqi@0:         if (typeElement.getKind().equals(ElementKind.CLASS)) {
aoqi@0:             TypeMirror sup = typeElement.getSuperclass();
aoqi@0:             if (!sup.getKind().equals(TypeKind.NONE))
aoqi@0:                 return (TypeElement) ((DeclaredType) sup).asElement();
aoqi@0:             else
aoqi@0:                 return null;
aoqi@0:         }
aoqi@0:         return env.getElementUtils().getTypeElement(Object.class.getName());
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror getBaseClass(TypeMirror type, TypeElement sup) {
aoqi@0:         return baseClassFinder.visit(type, sup);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getClassName(TypeElement t) {
aoqi@0:         return t.getQualifiedName().toString();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getTypeName(TypeMirror typeMirror) {
aoqi@0:         return typeMirror.toString();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getClassShortName(TypeElement t) {
aoqi@0:         return t.getSimpleName().toString();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Collection<VariableElement> getDeclaredFields(TypeElement typeElement) {
aoqi@0:         return ElementFilter.fieldsIn(typeElement.getEnclosedElements());
aoqi@0:     }
aoqi@0: 
aoqi@0:     public VariableElement getDeclaredField(TypeElement clazz, String fieldName) {
aoqi@0:         for (VariableElement fd : ElementFilter.fieldsIn(clazz.getEnclosedElements())) {
aoqi@0:             if (fd.getSimpleName().toString().equals(fieldName))
aoqi@0:                 return fd;
aoqi@0:         }
aoqi@0:         return null;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Collection<ExecutableElement> getDeclaredMethods(TypeElement typeElement) {
aoqi@0:         return ElementFilter.methodsIn(typeElement.getEnclosedElements());
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeElement getDeclaringClassForField(VariableElement f) {
aoqi@0:         return (TypeElement) f.getEnclosingElement();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeElement getDeclaringClassForMethod(ExecutableElement m) {
aoqi@0:         return (TypeElement) m.getEnclosingElement();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror getFieldType(VariableElement f) {
aoqi@0:         return f.asType();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getFieldName(VariableElement f) {
aoqi@0:         return f.getSimpleName().toString();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getMethodName(ExecutableElement m) {
aoqi@0:         return m.getSimpleName().toString();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror getReturnType(ExecutableElement m) {
aoqi@0:         return m.getReturnType();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror[] getMethodParameters(ExecutableElement m) {
aoqi@0:         Collection<? extends VariableElement> ps = m.getParameters();
aoqi@0:         TypeMirror[] r = new TypeMirror[ps.size()];
aoqi@0:         int i=0;
aoqi@0:         for (VariableElement p : ps)
aoqi@0:             r[i++] = p.asType();
aoqi@0:         return r;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isStaticMethod(ExecutableElement m) {
aoqi@0:         return hasModifier(m, Modifier.STATIC);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isFinalMethod(ExecutableElement m) {
aoqi@0:         return hasModifier(m, Modifier.FINAL);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private boolean hasModifier(Element d, Modifier mod) {
aoqi@0:         return d.getModifiers().contains(mod);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isSubClassOf(TypeMirror sub, TypeMirror sup) {
aoqi@0:         if(sup==DUMMY)
aoqi@0:         // see ref(). if the sub type is known to Annotation Processing,
aoqi@0:         // its base class must be known. Thus if the sup is DUMMY,
aoqi@0:         // it cannot possibly be the super type.
aoqi@0:             return false;
aoqi@0:         return env.getTypeUtils().isSubtype(sub,sup);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private String getSourceClassName(Class clazz) {
aoqi@0:         Class<?> d = clazz.getDeclaringClass();
aoqi@0:         if(d==null)
aoqi@0:             return clazz.getName();
aoqi@0:         else {
aoqi@0:             String shortName = clazz.getName().substring(d.getName().length()+1/*for $*/);
aoqi@0:             return getSourceClassName(d)+'.'+shortName;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror ref(Class c) {
aoqi@0:         if(c.isArray())
aoqi@0:             return env.getTypeUtils().getArrayType( ref(c.getComponentType()) );
aoqi@0:         if(c.isPrimitive())
aoqi@0:             return getPrimitive(c);
aoqi@0:         TypeElement t = env.getElementUtils().getTypeElement(getSourceClassName(c));
aoqi@0:         // Annotation Processing only operates on a set of classes used in the compilation,
aoqi@0:         // and it won't recognize additional classes (even if they are visible from javac)
aoqi@0:         // and return null.
aoqi@0:         //
aoqi@0:         // this is causing a problem where we check if a type is collection.
aoqi@0:         // so until the problem is fixed in Annotation Processing, work around the issue
aoqi@0:         // by returning a dummy token
aoqi@0:         // TODO: check if this is still valid
aoqi@0:         if(t==null)
aoqi@0:             return DUMMY;
aoqi@0:         return env.getTypeUtils().getDeclaredType(t);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror use(TypeElement t) {
aoqi@0:         assert t != null;
aoqi@0:         return env.getTypeUtils().getDeclaredType(t);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeElement asDecl(TypeMirror m) {
aoqi@0:         m = env.getTypeUtils().erasure(m);
aoqi@0:         if (m.getKind().equals(TypeKind.DECLARED)) {
aoqi@0:             DeclaredType d = (DeclaredType) m;
aoqi@0:             return (TypeElement) d.asElement();
aoqi@0:         } else
aoqi@0:             return null;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeElement asDecl(Class c) {
aoqi@0:         return env.getElementUtils().getTypeElement(getSourceClassName(c));
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror erasure(TypeMirror t) {
aoqi@0:         Types tu = env.getTypeUtils();
aoqi@0:         t = tu.erasure(t);
aoqi@0:         if (t.getKind().equals(TypeKind.DECLARED)) {
aoqi@0:             DeclaredType dt = (DeclaredType)t;
aoqi@0:             if (!dt.getTypeArguments().isEmpty())
aoqi@0:                 return tu.getDeclaredType((TypeElement) dt.asElement());
aoqi@0:         }
aoqi@0:         return t;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isAbstract(TypeElement clazz) {
aoqi@0:         return hasModifier(clazz,Modifier.ABSTRACT);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isFinal(TypeElement clazz) {
aoqi@0:         return hasModifier(clazz, Modifier.FINAL);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public VariableElement[] getEnumConstants(TypeElement clazz) {
aoqi@0:         List<? extends Element> elements = env.getElementUtils().getAllMembers(clazz);
aefimov@835:         Collection<VariableElement> constants = new ArrayList<VariableElement>();
aoqi@0:         for (Element element : elements) {
aoqi@0:             if (element.getKind().equals(ElementKind.ENUM_CONSTANT)) {
aoqi@0:                 constants.add((VariableElement) element);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return constants.toArray(new VariableElement[constants.size()]);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror getVoidType() {
aoqi@0:         return env.getTypeUtils().getNoType(TypeKind.VOID);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getPackageName(TypeElement clazz) {
aoqi@0:         return env.getElementUtils().getPackageOf(clazz).getQualifiedName().toString();
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public TypeElement loadObjectFactory(TypeElement referencePoint, String packageName) {
aoqi@0:         return env.getElementUtils().getTypeElement(packageName + ".ObjectFactory");
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isBridgeMethod(ExecutableElement method) {
aoqi@0:         return method.getModifiers().contains(Modifier.VOLATILE);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isOverriding(ExecutableElement method, TypeElement base) {
aoqi@0:         Elements elements = env.getElementUtils();
aoqi@0: 
aoqi@0:         while (true) {
aoqi@0:             for (ExecutableElement m : ElementFilter.methodsIn(elements.getAllMembers(base))) {
aoqi@0:                 if (elements.overrides(method, m, base))
aoqi@0:                     return true;
aoqi@0:             }
aoqi@0: 
aoqi@0:             if (base.getSuperclass().getKind().equals(TypeKind.NONE))
aoqi@0:                 return false;
aoqi@0:             base = (TypeElement) env.getTypeUtils().asElement(base.getSuperclass());
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isInterface(TypeElement clazz) {
aoqi@0:         return clazz.getKind().isInterface();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isTransient(VariableElement f) {
aoqi@0:         return f.getModifiers().contains(Modifier.TRANSIENT);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isInnerClass(TypeElement clazz) {
aoqi@0:         return clazz.getEnclosingElement() != null && !clazz.getModifiers().contains(Modifier.STATIC);
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public boolean isSameType(TypeMirror t1, TypeMirror t2) {
aoqi@0:         return env.getTypeUtils().isSameType(t1, t2);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isArray(TypeMirror type) {
aoqi@0:         return type != null && type.getKind().equals(TypeKind.ARRAY);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isArrayButNotByteArray(TypeMirror t) {
aoqi@0:         if(!isArray(t))
aoqi@0:             return false;
aoqi@0: 
aoqi@0:         ArrayType at = (ArrayType) t;
aoqi@0:         TypeMirror ct = at.getComponentType();
aoqi@0: 
aoqi@0:         return !ct.equals(primitiveByte);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror getComponentType(TypeMirror t) {
aoqi@0:         if (isArray(t)) {
aoqi@0:             ArrayType at = (ArrayType) t;
aoqi@0:             return at.getComponentType();
aoqi@0:         }
aoqi@0: 
aoqi@0:         throw new IllegalArgumentException();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror getTypeArgument(TypeMirror typeMirror, int i) {
aoqi@0:         if (typeMirror != null && typeMirror.getKind().equals(TypeKind.DECLARED)) {
aoqi@0:             DeclaredType declaredType = (DeclaredType) typeMirror;
aoqi@0:             TypeMirror[] args = declaredType.getTypeArguments().toArray(new TypeMirror[declaredType.getTypeArguments().size()]);
aoqi@0:             return args[i];
aoqi@0:         } else throw new IllegalArgumentException();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isParameterizedType(TypeMirror typeMirror) {
aoqi@0:         if (typeMirror != null && typeMirror.getKind().equals(TypeKind.DECLARED)) {
aoqi@0:             DeclaredType d = (DeclaredType) typeMirror;
aoqi@0:             return !d.getTypeArguments().isEmpty();
aoqi@0:         }
aoqi@0:         return false;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isPrimitive(TypeMirror t) {
aoqi@0:         return t.getKind().isPrimitive();
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static final Map<Class, TypeKind> primitives = new HashMap<Class, TypeKind>();
aoqi@0: 
aoqi@0:     static {
aoqi@0:         primitives.put(Integer.TYPE, TypeKind.INT);
aoqi@0:         primitives.put(Byte.TYPE, TypeKind.BYTE);
aoqi@0:         primitives.put(Float.TYPE, TypeKind.FLOAT);
aoqi@0:         primitives.put(Boolean.TYPE, TypeKind.BOOLEAN);
aoqi@0:         primitives.put(Short.TYPE, TypeKind.SHORT);
aoqi@0:         primitives.put(Long.TYPE, TypeKind.LONG);
aoqi@0:         primitives.put(Double.TYPE, TypeKind.DOUBLE);
aoqi@0:         primitives.put(Character.TYPE, TypeKind.CHAR);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public TypeMirror getPrimitive(Class primitiveType) {
aoqi@0:         assert primitiveType.isPrimitive();
aoqi@0:         if(primitiveType==void.class)
aoqi@0:             return getVoidType();
aoqi@0:         return env.getTypeUtils().getPrimitiveType(primitives.get(primitiveType));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * see {@link #ref(Class)}.
aoqi@0:      */
aoqi@0:     private static final TypeMirror DUMMY = new TypeMirror() {
aoqi@0:         @Override
aoqi@0:         public <R, P> R accept(TypeVisitor<R, P> v, P p) {
aoqi@0:             throw new IllegalStateException();
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public TypeKind getKind() {
aoqi@0:             throw new IllegalStateException();
aoqi@0:         }
aoqi@0: 
aoqi@0: //        @Override
aoqi@0:         public List<? extends AnnotationMirror> getAnnotationMirrors() {
aoqi@0:             throw new IllegalStateException();
aoqi@0:         }
aoqi@0: 
aoqi@0: //        @Override
aoqi@0:         public <A extends Annotation> A getAnnotation(Class<A> annotationType) {
aoqi@0:             throw new IllegalStateException();
aoqi@0:         }
aoqi@0: 
aoqi@0: //        @Override
aoqi@0:         public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationType) {
aoqi@0:             throw new IllegalStateException();
aoqi@0:         }
aoqi@0:     };
aoqi@0: 
aoqi@0:     public Location getClassLocation(TypeElement typeElement) {
aoqi@0:         Trees trees = Trees.instance(env);
aoqi@0:         return getLocation(typeElement.getQualifiedName().toString(), trees.getPath(typeElement));
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Location getFieldLocation(VariableElement variableElement) {
aoqi@0:         return getLocation(variableElement);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Location getMethodLocation(ExecutableElement executableElement) {
aoqi@0:         return getLocation(executableElement);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean hasDefaultConstructor(TypeElement t) {
aoqi@0:         if (t == null || !t.getKind().equals(ElementKind.CLASS))
aoqi@0:             return false;
aoqi@0: 
aoqi@0:         for (ExecutableElement init : ElementFilter.constructorsIn(env.getElementUtils().getAllMembers(t))) {
aoqi@0:             if (init.getParameters().isEmpty())
aoqi@0:                 return true;
aoqi@0:         }
aoqi@0:         return false;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isStaticField(VariableElement f) {
aoqi@0:         return hasModifier(f,Modifier.STATIC);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isPublicMethod(ExecutableElement m) {
aoqi@0:         return hasModifier(m,Modifier.PUBLIC);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isPublicField(VariableElement f) {
aoqi@0:         return hasModifier(f,Modifier.PUBLIC);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isEnum(TypeElement t) {
aoqi@0:         return t != null && t.getKind().equals(ElementKind.ENUM);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private Location getLocation(Element element) {
aoqi@0:         Trees trees = Trees.instance(env);
aoqi@0:         return getLocation(
aoqi@0:                 ((TypeElement) element.getEnclosingElement()).getQualifiedName() + "." + element.getSimpleName(),
aoqi@0:                 trees.getPath(element)
aoqi@0:         );
aoqi@0:     }
aoqi@0: 
aoqi@0:     private Location getLocation(final String name, final TreePath treePath) {
aoqi@0:         return new Location() {
aoqi@0:             public String toString() {
aoqi@0:                 if (treePath == null)
aoqi@0:                     return name + " (Unknown Source)";
aoqi@0:                 // just like stack trace, we just print the file name and
aoqi@0:                 // not the whole path. The idea is that the package name should
aoqi@0:                 // provide enough clue on which directory it lives.
aoqi@0:                 CompilationUnitTree compilationUnit = treePath.getCompilationUnit();
aoqi@0:                 Trees trees = Trees.instance(env);
aoqi@0:                 long startPosition = trees.getSourcePositions().getStartPosition(compilationUnit, treePath.getLeaf());
aoqi@0:                 return name + "(" +
aoqi@0:                         compilationUnit.getSourceFile().getName() + ":" + compilationUnit.getLineMap().getLineNumber(startPosition) +
aoqi@0:                         ")";
aoqi@0:             }
aoqi@0:         };
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Implements {@link #getBaseClass}.
aoqi@0:      */
aoqi@0:     private final SimpleTypeVisitor6<TypeMirror, TypeElement> baseClassFinder = new SimpleTypeVisitor6<TypeMirror, TypeElement>() {
aoqi@0:         @Override
aoqi@0:         public TypeMirror visitDeclared(DeclaredType t, TypeElement sup) {
aoqi@0:             if (t.asElement().equals(sup))
aoqi@0:                 return t;
aoqi@0: 
aoqi@0:             for (TypeMirror i : env.getTypeUtils().directSupertypes(t)) {
aoqi@0:                 TypeMirror r = visitDeclared((DeclaredType) i, sup);
aoqi@0:                 if (r != null)
aoqi@0:                     return r;
aoqi@0:             }
aoqi@0: 
aoqi@0:             // otherwise recursively apply super class and base types
aoqi@0:             TypeMirror superclass = ((TypeElement) t.asElement()).getSuperclass();
aoqi@0:             if (!superclass.getKind().equals(TypeKind.NONE)) {
aoqi@0:                 TypeMirror r = visitDeclared((DeclaredType) superclass, sup);
aoqi@0:                 if (r != null)
aoqi@0:                     return r;
aoqi@0:             }
aoqi@0:             return null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public TypeMirror visitTypeVariable(TypeVariable t, TypeElement typeElement) {
aoqi@0:             // we are checking if T (declared as T extends A&B&C) is assignable to sup.
aoqi@0:             // so apply bounds recursively.
aoqi@0:             for (TypeMirror typeMirror : ((TypeParameterElement) t.asElement()).getBounds()) {
aoqi@0:                 TypeMirror m = visit(typeMirror, typeElement);
aoqi@0:                 if (m != null)
aoqi@0:                     return m;
aoqi@0:             }
aoqi@0:             return null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public TypeMirror visitArray(ArrayType t, TypeElement typeElement) {
aoqi@0:             // we are checking if t=T[] is assignable to sup.
aoqi@0:             // the only case this is allowed is sup=Object,
aoqi@0:             // and Object isn't parameterized.
aoqi@0:             return null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public TypeMirror visitWildcard(WildcardType t, TypeElement typeElement) {
aoqi@0:             // we are checking if T (= ? extends A&B&C) is assignable to sup.
aoqi@0:             // so apply bounds recursively.
aoqi@0:             return visit(t.getExtendsBound(), typeElement);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected TypeMirror defaultAction(TypeMirror e, TypeElement typeElement) {
aoqi@0:             return e;
aoqi@0:         }
aoqi@0:     };
aoqi@0: }