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.util;

import org.eclipse.jdt.core.util.ClassFormatException;
import org.eclipse.jdt.core.util.IConstantPool;
import org.eclipse.jdt.core.util.IConstantPoolConstant;
import org.eclipse.jdt.core.util.IConstantPoolEntry;
import org.eclipse.jdt.core.util.IEnclosingMethodAttribute;

Default implementation of EnclosingMethodAttribute.
Since:
3.0/**
 * Default implementation of EnclosingMethodAttribute.
 *
 * @since 3.0
 */
public class EnclosingMethodAttribute extends ClassFileAttribute implements IEnclosingMethodAttribute {

	private int enclosingClassIndex;
	private char[] enclosingClassName;
	private int methodDescriptorIndex;
	private char[] methodDescriptor;
	private int methodNameIndex;
	private char[] methodName;
	private int methodNameAndTypeIndex;

	EnclosingMethodAttribute(byte[] classFileBytes, IConstantPool constantPool, int offset) throws ClassFormatException {
		super(classFileBytes, constantPool, offset);
		int index = u2At(classFileBytes, 6, offset);
		this.enclosingClassIndex = index;
		IConstantPoolEntry constantPoolEntry = constantPool.decodeEntry(index);
		if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Class) {
			throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
		}
		this.enclosingClassName = constantPoolEntry.getClassInfoName();
		this.methodNameAndTypeIndex = u2At(classFileBytes, 8, offset);
		if (this.methodNameAndTypeIndex != 0) {
			constantPoolEntry = constantPool.decodeEntry(this.methodNameAndTypeIndex);
			if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_NameAndType) {
				throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
			}
			this.methodDescriptorIndex = constantPoolEntry.getNameAndTypeInfoDescriptorIndex();
			this.methodNameIndex = constantPoolEntry.getNameAndTypeInfoNameIndex();
			constantPoolEntry = constantPool.decodeEntry(this.methodDescriptorIndex);
			if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Utf8) {
				throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
			}
			this.methodDescriptor = constantPoolEntry.getUtf8Value();
			constantPoolEntry = constantPool.decodeEntry(this.methodNameIndex);
			if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Utf8) {
				throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
			}
			this.methodName = constantPoolEntry.getUtf8Value();
		}
	}

	@Override
	public char[] getEnclosingClass() {
		return this.enclosingClassName;
	}

	@Override
	public int getEnclosingClassIndex() {
		return this.enclosingClassIndex;
	}

	@Override
	public char[] getMethodDescriptor() {
		return this.methodDescriptor;
	}

	@Override
	public int getMethodDescriptorIndex() {
		return this.methodDescriptorIndex;
	}

	@Override
	public char[] getMethodName() {
		return this.methodName;
	}

	@Override
	public int getMethodNameIndex() {
		return this.methodNameIndex;
	}

	@Override
	public int getMethodNameAndTypeIndex() {
		return this.methodNameAndTypeIndex;
	}
}