| /******************************************************************************* |
| * Copyright (c) 2007, 2013 BEA Systems, Inc. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * wharley@bea.com - initial API and implementation |
| * IBM Corporation - fix for 342470 |
| * IBM Corporation - fix for 342598 |
| * IBM Corporation - Java 8 support |
| *******************************************************************************/ |
| |
| package org.eclipse.jdt.internal.compiler.apt.model; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Array; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import javax.lang.model.element.AnnotationMirror; |
| import javax.lang.model.element.Element; |
| import javax.lang.model.element.ElementKind; |
| import javax.lang.model.element.ElementVisitor; |
| import javax.lang.model.element.PackageElement; |
| import javax.lang.model.element.TypeParameterElement; |
| import javax.lang.model.type.TypeMirror; |
| |
| import org.eclipse.jdt.internal.compiler.apt.dispatch.BaseProcessingEnvImpl; |
| import org.eclipse.jdt.internal.compiler.lookup.AnnotationBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment; |
| import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeVariableBinding; |
| |
| /** |
| * |
| */ |
| public class TypeParameterElementImpl extends ElementImpl implements TypeParameterElement |
| { |
| private final Element _declaringElement; |
| |
| // Cache the bounds, because they're expensive to compute |
| private List<? extends TypeMirror> _bounds = null; |
| |
| /* package */ TypeParameterElementImpl(BaseProcessingEnvImpl env, TypeVariableBinding binding, Element declaringElement) { |
| super(env, binding); |
| _declaringElement = declaringElement; |
| } |
| |
| /* package */ TypeParameterElementImpl(BaseProcessingEnvImpl env, TypeVariableBinding binding) { |
| super(env, binding); |
| _declaringElement = _env.getFactory().newElement(binding.declaringElement); |
| } |
| |
| @Override |
| public List<? extends TypeMirror> getBounds() |
| { |
| if (null == _bounds) { |
| _bounds = calculateBounds(); |
| } |
| return _bounds; |
| } |
| |
| // This code is drawn from org.eclipse.jdt.core.dom.TypeBinding.getTypeBounds() |
| private List<? extends TypeMirror> calculateBounds() { |
| TypeVariableBinding typeVariableBinding = (TypeVariableBinding)_binding; |
| ReferenceBinding varSuperclass = typeVariableBinding.superclass(); |
| TypeBinding firstClassOrArrayBound = typeVariableBinding.firstBound; |
| int boundsLength = 0; |
| boolean isFirstBoundATypeVariable = false; |
| if (firstClassOrArrayBound != null) { |
| if (firstClassOrArrayBound.isTypeVariable()) { |
| isFirstBoundATypeVariable = true; |
| } |
| if (TypeBinding.equalsEquals(firstClassOrArrayBound, varSuperclass)) { |
| boundsLength++; |
| if (firstClassOrArrayBound.isTypeVariable()) { |
| isFirstBoundATypeVariable = true; |
| } |
| } else if (firstClassOrArrayBound.isArrayType()) { // capture of ? extends/super arrayType |
| boundsLength++; |
| } else { |
| firstClassOrArrayBound = null; |
| } |
| } |
| ReferenceBinding[] superinterfaces = typeVariableBinding.superInterfaces(); |
| int superinterfacesLength = 0; |
| if (superinterfaces != null) { |
| superinterfacesLength = superinterfaces.length; |
| boundsLength += superinterfacesLength; |
| } |
| List<TypeMirror> typeBounds = new ArrayList<TypeMirror>(boundsLength); |
| if (boundsLength != 0) { |
| if (firstClassOrArrayBound != null) { |
| TypeMirror typeBinding = _env.getFactory().newTypeMirror(firstClassOrArrayBound); |
| if (typeBinding == null) { |
| return Collections.emptyList(); |
| } |
| typeBounds.add(typeBinding); |
| } |
| // we need to filter out remaining bounds if the first bound is a type variable |
| if (superinterfaces != null && !isFirstBoundATypeVariable) { |
| for (int i = 0; i < superinterfacesLength; i++) { |
| TypeMirror typeBinding = _env.getFactory().newTypeMirror(superinterfaces[i]); |
| if (typeBinding == null) { |
| return Collections.emptyList(); |
| } |
| typeBounds.add(typeBinding); |
| } |
| } |
| } else { |
| // at least we must add java.lang.Object |
| typeBounds.add(_env.getFactory().newTypeMirror(_env.getLookupEnvironment().getType(LookupEnvironment.JAVA_LANG_OBJECT))); |
| } |
| return Collections.unmodifiableList(typeBounds); |
| } |
| |
| @Override |
| public Element getGenericElement() |
| { |
| return _declaringElement; |
| } |
| |
| @Override |
| public <R, P> R accept(ElementVisitor<R, P> v, P p) |
| { |
| return v.visitTypeParameter(this, p); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * Java supports annotations on type parameters from JLS8 |
| * @see javax.lang.model.element.Element#getAnnotationMirrors() |
| */ |
| @Override |
| protected AnnotationBinding[] getAnnotationBindings() |
| { |
| return ((TypeVariableBinding)_binding).getTypeAnnotations(); |
| } |
| |
| private boolean shouldEmulateJavacBug() { |
| if (_env.getLookupEnvironment().globalOptions.emulateJavacBug8031744) { |
| AnnotationBinding [] annotations = getAnnotationBindings(); |
| for (int i = 0, length = annotations.length; i < length; i++) { |
| ReferenceBinding firstAnnotationType = annotations[i].getAnnotationType(); |
| for (int j = i+1; j < length; j++) { |
| ReferenceBinding secondAnnotationType = annotations[j].getAnnotationType(); |
| if (firstAnnotationType == secondAnnotationType) //$IDENTITY-COMPARISON$ |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public List<? extends AnnotationMirror> getAnnotationMirrors() { |
| if (shouldEmulateJavacBug()) |
| return Collections.emptyList(); |
| return super.getAnnotationMirrors(); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") // for the cast to A |
| public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationType) { |
| if (shouldEmulateJavacBug()) |
| return (A[]) Array.newInstance(annotationType, 0); |
| return super.getAnnotationsByType(annotationType); |
| } |
| |
| @Override |
| public <A extends Annotation> A getAnnotation(Class<A> annotationType) { |
| if (shouldEmulateJavacBug()) |
| return null; |
| return super.getAnnotation(annotationType); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * Always return an empty list; type parameters do not enclose other elements. |
| * @see javax.lang.model.element.Element#getEnclosedElements() |
| */ |
| @Override |
| public List<? extends Element> getEnclosedElements() |
| { |
| return Collections.emptyList(); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * Always return null. |
| * @see javax.lang.model.element.Element#getEnclosingElement() |
| */ |
| @Override |
| public Element getEnclosingElement() |
| { |
| return getGenericElement(); |
| } |
| |
| @Override |
| public ElementKind getKind() |
| { |
| return ElementKind.TYPE_PARAMETER; |
| } |
| |
| @Override |
| PackageElement getPackage() |
| { |
| // TODO what is the package of a type parameter? |
| return null; |
| } |
| |
| @Override |
| public String toString() { |
| return new String(_binding.readableName()); |
| } |
| } |