org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/lookup/AnnotationHolder.java

/*******************************************************************************
 * Copyright (c) 2000, 2009 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;

public class AnnotationHolder {
	AnnotationBinding[] annotations;

static AnnotationHolder storeAnnotations(AnnotationBinding[] annotations, AnnotationBinding[][] parameterAnnotations, Object defaultValue, LookupEnvironment optionalEnv) {
	if (parameterAnnotations != null) {
		boolean isEmpty = true;
		for (int i = parameterAnnotations.length; isEmpty && --i >= 0;)
			if (parameterAnnotations[i] != null && parameterAnnotations[i].length > 0)
				isEmpty = false;
		if (isEmpty)
			parameterAnnotations = null; // does not have any
	}

	if (defaultValue != null)
		return new AnnotationMethodHolder(annotations, parameterAnnotations, defaultValue, optionalEnv);
	if (parameterAnnotations != null)
		return new MethodHolder(annotations, parameterAnnotations);
	return new AnnotationHolder().setAnnotations(annotations);
}

AnnotationBinding[] getAnnotations() {
	return this.annotations;
}
Object getDefaultValue() {
	return null;
}
public AnnotationBinding[][] getParameterAnnotations() {
	return null;
}
AnnotationBinding[] getParameterAnnotations(int paramIndex) {
	return Binding.NO_ANNOTATIONS;
}
AnnotationHolder setAnnotations(AnnotationBinding[] annotations) {
	this.annotations = annotations;
	if (annotations == null || annotations.length == 0)
		return null; // no longer needed
	return this;
}

static class MethodHolder extends AnnotationHolder {
	AnnotationBinding[][] parameterAnnotations; // is null if empty

MethodHolder(AnnotationBinding[] annotations, AnnotationBinding[][] parameterAnnotations) {
	super();
	setAnnotations(annotations);
	this.parameterAnnotations = parameterAnnotations;
}
@Override
public AnnotationBinding[][] getParameterAnnotations() {
	return this.parameterAnnotations;
}
@Override
AnnotationBinding[] getParameterAnnotations(int paramIndex) {
	AnnotationBinding[] result = this.parameterAnnotations == null ? null : this.parameterAnnotations[paramIndex];
	return result == null ? Binding.NO_ANNOTATIONS : result;
}
@Override
AnnotationHolder setAnnotations(AnnotationBinding[] annotations) {
	this.annotations = annotations == null || annotations.length == 0 ? Binding.NO_ANNOTATIONS : annotations;
	return this;
}
}

static class AnnotationMethodHolder extends MethodHolder {
	Object defaultValue;
	LookupEnvironment env;

AnnotationMethodHolder(AnnotationBinding[] annotations, AnnotationBinding[][] parameterAnnotations, Object defaultValue, LookupEnvironment optionalEnv) {
	super(annotations, parameterAnnotations);
	this.defaultValue = defaultValue;
	this.env = optionalEnv;
}
@Override
Object getDefaultValue() {
	if (this.defaultValue instanceof UnresolvedReferenceBinding) {
		if (this.env == null)
			throw new IllegalStateException();
		this.defaultValue = ((UnresolvedReferenceBinding) this.defaultValue).resolve(this.env, false);
	}
	return this.defaultValue;
}
}
}