org.eclipse.jdt.debug/eval/org/eclipse/jdt/internal/debug/eval/ast/instructions/ArrayAccess.java

/*******************************************************************************
 * Copyright (c) 2000, 2005 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.debug.eval.ast.instructions;


import com.ibm.icu.text.MessageFormat;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jdt.debug.core.IJavaArray;
import org.eclipse.jdt.debug.core.IJavaPrimitiveValue;
import org.eclipse.jdt.internal.debug.core.JDIDebugPlugin;
 
/**
 * Resolves an array access - the top of the stack is
 * the position, and the second from top is the array
 * object.
 */
public class ArrayAccess extends ArrayInstruction {
	
	public ArrayAccess(int start) {
		super(start);
	}
	
	public void execute() throws CoreException {
		int index = ((IJavaPrimitiveValue)popValue()).getIntValue();
		IJavaArray array = (IJavaArray)popValue();
		if (index >= array.getLength() || index < 0) {
			throw new CoreException(new Status(IStatus.ERROR, JDIDebugPlugin.getUniqueIdentifier(), IStatus.OK, MessageFormat.format(InstructionsEvaluationMessages.ArrayAccess_illegal_index, new Object[] {new Integer(index)}), null)); 
		}
		push(array.getVariable(index));
	}

	public String toString() {
		return InstructionsEvaluationMessages.ArrayAccess_array_access_1; 
	}
}