Copyright (c) 2000, 2009 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2009 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * 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;
}
}
}