/*******************************************************************************
* Copyright (c) 2009 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
* Zend Technologies
*******************************************************************************/
package org.eclipse.php.internal.debug.ui.watch;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.*;
import org.eclipse.php.internal.debug.core.xdebug.dbgp.model.DBGpTarget;
import org.eclipse.php.internal.debug.core.xdebug.dbgp.model.DBGpVariable;
import org.eclipse.php.internal.debug.ui.Logger;
import org.eclipse.php.internal.debug.ui.PHPDebugUIMessages;
import org.w3c.dom.Node;
/**
*
*/
public class XDebugWatchExpressionDelegate implements IWatchExpressionDelegate {
private String expressionText;
private IWatchExpressionListener watchListener;
private DBGpTarget debugTarget;
private Job evalJob;
/**
* @see org.eclipse.debug.core.model.IWatchExpressionDelegate#getValue(java.lang.String,
* org.eclipse.debug.core.model.IDebugElement)
*/
public void evaluateExpression(String expression, IDebugElement context,
IWatchExpressionListener listener) {
expressionText = expression;
watchListener = listener;
IDebugTarget target = context.getDebugTarget();
if (target instanceof DBGpTarget) {
debugTarget = (DBGpTarget) target;
if (!debugTarget.isSuspended()) {
// can't evaluate unless suspended
watchListener.watchEvaluationFinished(null);
} else {
evalJob = new EvaluationRunnable();
evalJob.schedule();
}
} else {
watchListener.watchEvaluationFinished(null);
}
}
/**
* Runnable used to evaluate the expression.
*/
private final class EvaluationRunnable extends Job {
public EvaluationRunnable() {
super("XDEbugEvaluationRunnable"); //$NON-NLS-1$
setSystem(true);
}
public IStatus run(IProgressMonitor monitor) {
try {
XDebugWatchExpressionResult watchResult = new XDebugWatchExpressionResult();
watchResult.evaluate();
watchListener.watchEvaluationFinished(watchResult);
} catch (Exception e) {
Logger.logException(e);
watchListener.watchEvaluationFinished(null);
}
return Status.OK_STATUS;
}
}
private class XDebugWatchExpressionResult implements
IWatchExpressionResult, IWatchExpressionResultExtension {
private boolean hasErrors = false;
private IValue evalResult;
public IValue getValue() {
return evalResult;
}
public void evaluate() {
// Logger.debug("getValue() for: " + expressionText);
String stackLevel = "0"; //$NON-NLS-1$
String testExp = expressionText.trim();
Node result = null;
// disable this performance enhancement as it requires
// better determination of whether we have a variable
// or an expression.
/*
* if (testExp.startsWith("$") && testExp.substring(1).indexOf(" ")
* == -1) { result = debugTarget.getProperty(testExp, stackLevel,
* 0); } else { result = debugTarget.eval(testExp); }
*/
result = debugTarget.eval(testExp);
if (result != null) {
IVariable tempVar = new DBGpVariable(debugTarget, result,
stackLevel);
evalResult = null;
try {
evalResult = tempVar.getValue();
if (evalResult == null) {
hasErrors = true;
}
} catch (Exception e) {
hasErrors = true;
}
} else {
hasErrors = true;
}
}
public boolean hasErrors() {
return hasErrors;
}
public String[] getErrorMessages() {
if (hasErrors) {
// failed to evaluate expression.
return new String[] { PHPDebugUIMessages.XDebugWatch_failed };
}
return null;
}
public String getExpressionText() {
return expressionText;
}
public DebugException getException() {
return null;
}
public IDebugTarget getDebugTarget() {
return debugTarget;
}
}
}