Copyright (c) 2018 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
/*******************************************************************************
 * Copyright (c) 2018 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.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.INestHostAttribute;

public class NestHostAttribute extends ClassFileAttribute implements INestHostAttribute {

	private int hostIndex;
	private char[] hostName;

	public NestHostAttribute(byte[] classFileBytes, IConstantPool constantPool, int offset)
			throws ClassFormatException {
		super(classFileBytes, constantPool, offset);
		int index = u2At(classFileBytes, 6, offset);
		this.hostIndex = index;
		IConstantPoolEntry constantPoolEntry = constantPool.decodeEntry(index);
		if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Class) {
			throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
		}
		this.hostName = constantPoolEntry.getClassInfoName();
	}

	@Override
	public char[] getNestHostName() {
		return this.hostName;
	}

	@Override
	public int getNestHostIndex() {
		return this.hostIndex;
	}
	@Override
	public String toString() {
		return new String(this.hostName);
	}
}