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/*******************************************************************************
* Copyright (c) 2011, 2013 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.core.properties;
import org.eclipse.core.runtime.IAdapterManager;
import org.eclipse.core.runtime.Platform;
/**
* Adapter helper property tester implementation.
*/
public class PropertyTester extends org.eclipse.core.expressions.PropertyTester {
/* (non-Javadoc)
* @see org.eclipse.core.expressions.IPropertyTester#test(java.lang.Object, java.lang.String, java.lang.Object[], java.lang.Object)
*/
@Override
public boolean test(Object receiver, String property, Object[] args, Object expectedValue) {
IAdapterManager manager = Platform.getAdapterManager();
if (manager == null) return false;
// "hasAdapter": Checks if the adapter given by the arguments is registered for the given receiver
if ("hasAdapter".equals(property)) { //$NON-NLS-1$
// The class to adapt to is within the expected value
String adapterType = expectedValue instanceof String ? (String)expectedValue : null;
if (adapterType != null) {
return manager.hasAdapter(receiver, adapterType);
}
}
if ("canAdaptTo".equals(property)) { //$NON-NLS-1$
// Read the arguments and look for "forceAdapterLoad"
boolean forceAdapterLoad = false;
for (Object arg : args) {
if (arg instanceof String && "forceAdapterLoad".equalsIgnoreCase((String)arg)) { //$NON-NLS-1$
forceAdapterLoad = true;
}
}
// The class to adapt to is within the expected value
String adapterType = expectedValue instanceof String ? (String)expectedValue : null;
if (adapterType != null) {
Object adapter = manager.getAdapter(receiver, adapterType);
if (adapter != null) return true;
// No adapter. This can happen too if the plug-in contributing the adapter
// factory hasn't been loaded yet.
if (forceAdapterLoad) adapter = manager.loadAdapter(receiver, adapterType);
if (adapter != null) return true;
}
}
// "hasEnvVar" tests for the existence of a system property or environment variable
// with the name passed in via the arguments.
if ("hasEnvVar".equals(property) && expectedValue instanceof Boolean) { //$NON-NLS-1$
boolean hasEnvVar = false;
String name = null;
for (Object arg : args) {
if (arg instanceof String) {
name = (String)arg;
break;
}
}
if (name != null) {
String value = System.getProperty(name);
if (value == null) value = System.getenv(name);
hasEnvVar = value != null;
}
return hasEnvVar == ((Boolean)expectedValue).booleanValue();
}
return false;
}
}
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