| /******************************************************************************* |
| * Copyright (c) 2000, 2011 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 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.debug.core.IJavaValue; |
| import org.eclipse.jdt.internal.debug.core.JDIDebugPlugin; |
| |
| import com.ibm.icu.text.MessageFormat; |
| |
| /** |
| * 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); |
| } |
| |
| @Override |
| public void execute() throws CoreException { |
| int index = ((IJavaPrimitiveValue) popValue()).getIntValue(); |
| IJavaArray array = popArray(); |
| 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)); |
| } |
| |
| @Override |
| public String toString() { |
| return InstructionsEvaluationMessages.ArrayAccess_array_access_1; |
| } |
| |
| /** |
| * Pops an array object off the top of the stack. Throws an exception if not |
| * an array object or <code>null</code>. |
| * |
| * @return array object on top of the stack |
| * @throws CoreException |
| * if not available |
| */ |
| protected IJavaArray popArray() throws CoreException { |
| IJavaValue value = popValue(); |
| if (value instanceof IJavaArray) { |
| return (IJavaArray) value; |
| } else if (value.isNull()) { |
| // null pointer |
| throw new CoreException(new Status(IStatus.ERROR, |
| JDIDebugPlugin.getUniqueIdentifier(), IStatus.OK, |
| InstructionsEvaluationMessages.ArrayAccess_0, null)); |
| } else { |
| // internal error |
| throw new CoreException(new Status(IStatus.ERROR, |
| JDIDebugPlugin.getUniqueIdentifier(), IStatus.OK, |
| "Internal error: attempt to access non-array object", null)); //$NON-NLS-1$ |
| } |
| } |
| } |