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.core;

import org.eclipse.jdt.core.IAnnotation;
import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.IMemberValuePair;
import org.eclipse.jdt.core.ISourceRange;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.SourceRange;
import org.eclipse.jdt.internal.compiler.env.IBinaryAnnotation;
import org.eclipse.jdt.internal.compiler.env.IBinaryElementValuePair;
import org.eclipse.jdt.internal.core.util.Util;

public class Annotation extends SourceRefElement implements IAnnotation {

	public static final IAnnotation[] NO_ANNOTATIONS = new IAnnotation[0];
	public static final IMemberValuePair[] NO_MEMBER_VALUE_PAIRS = new IMemberValuePair[0];

	protected String name;
	// require to distinguish same annotations in different member value pairs
	protected String memberValuePairName;

	public Annotation(JavaElement parent, String name) {
		this(parent, name, null);
	}

	public Annotation(JavaElement parent, String name, String memberValuePairName) {
		super(parent);
		this.name = name.intern();
		this.memberValuePairName = memberValuePairName;
	}

	@Override
	public boolean equals(Object o) {
		if (!(o instanceof Annotation)) {
			return false;
		}
		Annotation other = (Annotation) o;
		if (this.memberValuePairName == null) {
			if (other.memberValuePairName != null)
				return false;
		} else if (!this.memberValuePairName.equals(other.memberValuePairName)) {
			return false;
		}
		// name equality is checked as part of the super.equals(..)
		return super.equals(o);
	}

	public IMember getDeclaringMember() {
		return (IMember) getParent();
	}

	@Override
	public String getElementName() {
		return this.name;
	}

	@Override
	public int getElementType() {
		return ANNOTATION;
	}

	@Override
	protected char getHandleMementoDelimiter() {
		return JavaElement.JEM_ANNOTATION;
	}

	@Override
	public IMemberValuePair[] getMemberValuePairs() throws JavaModelException {
		Object info = getElementInfo();
		if (info instanceof AnnotationInfo)
			return ((AnnotationInfo) info).members;
		IBinaryElementValuePair[] binaryAnnotations = ((IBinaryAnnotation) info).getElementValuePairs();
		int length = binaryAnnotations.length;
		IMemberValuePair[] result = new IMemberValuePair[length];
		for (int i = 0; i < length; i++) {
			IBinaryElementValuePair binaryAnnotation = binaryAnnotations[i];
			MemberValuePair memberValuePair = new MemberValuePair(new String(binaryAnnotation.getName()));
			memberValuePair.value = Util.getAnnotationMemberValue(this, memberValuePair, binaryAnnotation.getValue());
			result[i] = memberValuePair;
		}
		return result;
	}

	@Override
	public ISourceRange getNameRange() throws JavaModelException {
		SourceMapper mapper= getSourceMapper();
		if (mapper != null) {
			IClassFile classFile = getClassFile();
			if (classFile != null) {
				// ensure the class file's buffer is open so that source ranges are computed
				classFile.getBuffer();
				return mapper.getNameRange(this);
			}
		}
		Object info = getElementInfo();
		if (info instanceof AnnotationInfo) {
			AnnotationInfo annotationInfo = (AnnotationInfo) info;
			return new SourceRange(annotationInfo.nameStart, annotationInfo.nameEnd - annotationInfo.nameStart + 1);
		}
		return null;
	}

	/*
	 * @see ISourceReference
	 */
	@Override
	public ISourceRange getSourceRange() throws JavaModelException {
		SourceMapper mapper= getSourceMapper();
		if (mapper != null) {
			// ensure the class file's buffer is open so that source ranges are computed
			IClassFile classFile = getClassFile();
			if (classFile != null) {
				classFile.getBuffer();
				return mapper.getSourceRange(this);
			}
		}
		return super.getSourceRange();
	}

	@Override
	public IClassFile getClassFile() {
		return ((JavaElement)getParent()).getClassFile();
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = super.hashCode();
		result = prime * result + ((this.memberValuePairName == null) ? 0 : this.memberValuePairName.hashCode());
		result = prime * result + this.name.hashCode();
		return result;
	}

	@Override
	protected void toStringName(StringBuffer buffer) {
		buffer.append('@');
		buffer.append(getElementName());
	}
}