model/org/eclipse/jdt/internal/core/util/LocalVariableAttribute.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.IAttributeNamesConstants;
import org.eclipse.jdt.core.util.IConstantPool;
import org.eclipse.jdt.core.util.ILocalVariableAttribute;
import org.eclipse.jdt.core.util.ILocalVariableTableEntry;

/**
 * Default implementation of ILocalVariableAttribute.
 */
public class LocalVariableAttribute
	extends ClassFileAttribute
	implements ILocalVariableAttribute {

	private static final ILocalVariableTableEntry[] NO_ENTRIES = new ILocalVariableTableEntry[0];
	private int localVariableTableLength;
	private ILocalVariableTableEntry[] localVariableTable;
	
	/**
	 * Constructor for LocalVariableAttribute.
	 * @param classFileBytes
	 * @param constantPool
	 * @param offset
	 * @throws ClassFormatException
	 */
	public LocalVariableAttribute(
		byte[] classFileBytes,
		IConstantPool constantPool,
		int offset)
		throws ClassFormatException {
		super(classFileBytes, constantPool, offset);
		this.localVariableTableLength = u2At(classFileBytes, 6, offset);
		int readOffset = 8;
		int length = this.localVariableTableLength;
		this.localVariableTable = NO_ENTRIES;
		if (length != 0) {
			this.localVariableTable = new LocalVariableTableEntry[length];
		}
		for (int i = 0; i < length; i++) {
			this.localVariableTable[i] = new LocalVariableTableEntry(classFileBytes, constantPool, offset + readOffset);
			readOffset += 10;
		}
	}

	/**
	 * @see org.eclipse.jdt.core.util.IClassFileAttribute#getAttributeName()
	 */
	public char[] getAttributeName() {
		return IAttributeNamesConstants.LOCAL_VARIABLE;
	}

	/**
	 * @see ILocalVariableAttribute#getLocalVariableTable()
	 */
	public ILocalVariableTableEntry[] getLocalVariableTable() {
		return this.localVariableTable;
	}

	/**
	 * @see ILocalVariableAttribute#getLocalVariableTableLength()
	 */
	public int getLocalVariableTableLength() {
		return this.localVariableTableLength;
	}

}