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/*******************************************************************************
* Copyright (c) 2011, 2012 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.runtime.persistence.internal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.expressions.EvaluationResult;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager;
import org.eclipse.tcf.te.runtime.extensions.ExecutableExtensionProxy;
import org.eclipse.tcf.te.runtime.persistence.activator.CoreBundleActivator;
/**
*/
public class PersistenceDelegateBindingExtensionPointManager extends AbstractExtensionPointManager<PersistenceDelegateBinding> {
/*
* Thread save singleton instance creation.
*/
private static class LazyInstance {
public static PersistenceDelegateBindingExtensionPointManager instance = new PersistenceDelegateBindingExtensionPointManager();
}
/**
* Constructor.
*/
PersistenceDelegateBindingExtensionPointManager() {
super();
}
/**
* Returns the singleton instance of the extension point manager.
*/
public static PersistenceDelegateBindingExtensionPointManager getInstance() {
return LazyInstance.instance;
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getExtensionPointId()
*/
@Override
protected String getExtensionPointId() {
return "org.eclipse.tcf.te.runtime.persistence.bindings"; //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getConfigurationElementName()
*/
@Override
protected String getConfigurationElementName() {
return "binding"; //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#doCreateExtensionProxy(org.eclipse.core.runtime.IConfigurationElement)
*/
@Override
protected ExecutableExtensionProxy<PersistenceDelegateBinding> doCreateExtensionProxy(IConfigurationElement element) throws CoreException {
return new ExecutableExtensionProxy<PersistenceDelegateBinding>(element) {
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.ExecutableExtensionProxy#newInstance()
*/
@Override
public PersistenceDelegateBinding newInstance() {
PersistenceDelegateBinding instance = new PersistenceDelegateBinding();
try {
instance.setInitializationData(getConfigurationElement(), null, null);
} catch (CoreException e) {
IStatus status = new Status(IStatus.ERROR, CoreBundleActivator.getUniqueIdentifier(),
e.getLocalizedMessage(), e);
Platform.getLog(CoreBundleActivator.getContext().getBundle()).log(status);
}
return instance;
}
};
}
/**
* Returns the applicable persistence delegate bindings for the given delegate context.
*
* @param context The delegate context or <code>null</code>.
* @return The list of applicable editor page bindings or an empty array.
*/
public PersistenceDelegateBinding[] getApplicableBindings(Object context, Object container) {
List<PersistenceDelegateBinding> applicable = new ArrayList<PersistenceDelegateBinding>();
for (PersistenceDelegateBinding binding : getBindings()) {
Expression enablement = binding.getEnablement();
// The binding is applicable by default if no expression is specified.
boolean isApplicable = enablement == null;
if (enablement != null) if (context != null) {
// Set the default variable to the delegate context.
EvaluationContext evalContext = new EvaluationContext(null, context);
evalContext.addVariable("context", context); //$NON-NLS-1$
if (context instanceof Class) evalContext.addVariable("contextClass", ((Class<?>)context).getName()); //$NON-NLS-1$
else evalContext.addVariable("contextClass", context.getClass().getName()); //$NON-NLS-1$
if (container != null) {
evalContext.addVariable("container", container); //$NON-NLS-1$
if (container instanceof Class) evalContext.addVariable("containerClass", ((Class<?>)container).getName()); //$NON-NLS-1$
else evalContext.addVariable("containerClass", container.getClass().getName()); //$NON-NLS-1$
}
// Allow plugin activation
evalContext.setAllowPluginActivation(true);
// Evaluate the expression
try {
isApplicable = enablement.evaluate(evalContext).equals(EvaluationResult.TRUE);
} catch (CoreException e) {
IStatus status = new Status(IStatus.ERROR, CoreBundleActivator.getUniqueIdentifier(),
e.getLocalizedMessage(), e);
Platform.getLog(CoreBundleActivator.getContext().getBundle()).log(status);
}
}
else // The enablement is false by definition if no delegate context is given.
isApplicable = false;
// Add the binding if applicable
if (isApplicable) applicable.add(binding);
}
// Sort the applicable bindings by priority
Collections.sort(applicable, new SortByPriority());
if (applicable.size() > 1) {
List<PersistenceDelegateBinding> overwritten = new ArrayList<PersistenceDelegateBinding>();
for (PersistenceDelegateBinding candidate : applicable)
for (PersistenceDelegateBinding overwriter : applicable) {
String[] overwrites = overwriter.getOverwrites();
if (overwrites != null && Arrays.asList(overwrites).contains(candidate.getId()))
overwritten.add(candidate);
}
for (PersistenceDelegateBinding toRemove : overwritten)
applicable.remove(toRemove);
}
return applicable.toArray(new PersistenceDelegateBinding[applicable.size()]);
}
/**
* Persistence delegate binding sort by priority comparator implementation.
*/
/* default */ static class SortByPriority implements Comparator<PersistenceDelegateBinding> {
/* (non-Javadoc)
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
@Override
public int compare(PersistenceDelegateBinding o1, PersistenceDelegateBinding o2) {
if (o1 != null && o2 != null) {
String p1 = o1.getPriority();
if (p1 == null || "".equals(p1)) p1 = "normal"; //$NON-NLS-1$ //$NON-NLS-2$
String p2 = o2.getPriority();
if (p2 == null || "".equals(p1)) p2 = "normal"; //$NON-NLS-1$ //$NON-NLS-2$
int i1 = 0;
if ("lowest".equalsIgnoreCase(p1)) i1 = -3; //$NON-NLS-1$
if ("lower".equalsIgnoreCase(p1)) i1 = -2; //$NON-NLS-1$
if ("low".equalsIgnoreCase(p1)) i1 = -1; //$NON-NLS-1$
if ("high".equalsIgnoreCase(p1)) i1 = 1; //$NON-NLS-1$
if ("higher".equalsIgnoreCase(p1)) i1 = 2; //$NON-NLS-1$
if ("highest".equalsIgnoreCase(p1)) i1 = 3; //$NON-NLS-1$
int i2 = 0;
if ("lowest".equalsIgnoreCase(p2)) i2 = -3; //$NON-NLS-1$
if ("lower".equalsIgnoreCase(p2)) i2 = -2; //$NON-NLS-1$
if ("low".equalsIgnoreCase(p2)) i2 = -1; //$NON-NLS-1$
if ("high".equalsIgnoreCase(p2)) i2 = 1; //$NON-NLS-1$
if ("higher".equalsIgnoreCase(p2)) i2 = 2; //$NON-NLS-1$
if ("highest".equalsIgnoreCase(p2)) i2 = 3; //$NON-NLS-1$
if (i1 < i2) return 1;
if (i1 > i2) return -1;
}
return 0;
}
}
/**
* Returns the list of all contributed persistence delegate bindings.
*
* @return The list of contributed persistence delegate bindings, or an empty array.
*/
public PersistenceDelegateBinding[] getBindings() {
List<PersistenceDelegateBinding> contributions = new ArrayList<PersistenceDelegateBinding>();
Collection<ExecutableExtensionProxy<PersistenceDelegateBinding>> persistenceDelegateBindings = getExtensions().values();
for (ExecutableExtensionProxy<PersistenceDelegateBinding> persistenceDelegateBinding : persistenceDelegateBindings) {
PersistenceDelegateBinding instance = persistenceDelegateBinding.getInstance();
if (instance != null && !contributions.contains(instance)) contributions.add(instance);
}
return contributions.toArray(new PersistenceDelegateBinding[contributions.size()]);
}
/**
* Returns the persistence delegate binding identified by its unique id. If no persistence
* delegate binding with the specified id is registered, <code>null</code> is returned.
*
* @param id The unique id of the persistence delegate binding or <code>null</code>
*
* @return The persistence delegate binding instance or <code>null</code>.
*/
public PersistenceDelegateBinding getBinding(String id) {
PersistenceDelegateBinding contribution = null;
if (getExtensions().containsKey(id)) {
ExecutableExtensionProxy<PersistenceDelegateBinding> proxy = getExtensions().get(id);
// Get the extension instance
contribution = proxy.getInstance();
}
return contribution;
}
}
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