model/org/eclipse/jdt/internal/core/util/ClassFileAttribute.java

/**********************************************************************
Copyright (c) 2002 IBM Corp. and others.
All rights reserved.   This program and the accompanying materials
are made available under the terms of the Common Public License v0.5
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v05.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.IClassFileAttribute;
import org.eclipse.jdt.core.util.IConstantPool;
import org.eclipse.jdt.core.util.IConstantPoolConstant;
import org.eclipse.jdt.core.util.IConstantPoolEntry;

/**
 * Default implementation of IClassFileAttribute
 */
public class ClassFileAttribute extends ClassFileStruct implements IClassFileAttribute {
	public static final IClassFileAttribute[] NO_ATTRIBUTES = new IClassFileAttribute[0];
	private long attributeLength;
	private int attributeNameIndex;
	private char[] attributeName;
	
	public ClassFileAttribute(byte[] classFileBytes, IConstantPool constantPool, int offset) throws ClassFormatException {
		this.attributeNameIndex = u2At(classFileBytes, 0, offset);
		this.attributeLength = u4At(classFileBytes, 2, offset);
		IConstantPoolEntry constantPoolEntry = constantPool.decodeEntry(this.attributeNameIndex);
		if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Utf8) {
			throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
		}
		this.attributeName = constantPoolEntry.getUtf8Value();
	}

	public int getAttributeNameIndex() {
		return this.attributeNameIndex;
	}

	/**
	 * @see IClassFileAttribute#getAttributeName()
	 */
	public char[] getAttributeName() {
		return this.attributeName;
	}

	/**
	 * @see IClassFileAttribute#getAttributeLength()
	 */
	public long getAttributeLength() {
		return this.attributeLength;
	}

}