package org.eclipse.jst.jsf.core.jsfappconfig.internal;
import java.util.Collections;
import java.util.List;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.QualifiedName;
import org.eclipse.jst.jsf.common.internal.pde.AbstractSimpleClassExtensionRegistryReader;
import org.eclipse.jst.jsf.common.internal.strategy.AbstractTestableExtensibleDefaultProviderSelectionStrategy;
import org.eclipse.jst.jsf.common.internal.strategy.TestableProjectFactoryStrategy;
import org.eclipse.jst.jsf.core.internal.JSFCorePlugin;
import org.eclipse.jst.jsf.core.jsfappconfig.IJSFAppConfigLocater;
/**
* Composite strategy for providing {@link IJSFAppConfigLocatorProvider}s
*
*/
public class CompositeJSFAppConfigLocatorProviderStrategy
implements IJSFAppConfigLocatorProvider {
/**
* Project property session key for testing.
* Project value should hold the testable IJSFAppConfigLocatorProvider instance or null
* NOT API - for testing purposes
*/
public static final QualifiedName TESTABLE_FACTORY_SESSION_KEY = new QualifiedName(JSFCorePlugin.PLUGIN_ID, "LocatorProviderStrategyFactory"); //$NON-NLS-1$
private IProject _project;
/**
* @param project - may be null
*/
public CompositeJSFAppConfigLocatorProviderStrategy(final IProject project) {
_project = project;
}
public List<IJSFAppConfigLocater> getLocators() {
final LocatorProviderSelectionStrategy providerSelector = new LocatorProviderSelectionStrategy();
addLocatorProviderStrategies(providerSelector);
final IJSFAppConfigLocatorProvider provider = providerSelector.perform(_project);
if (provider != providerSelector.getNoResult())
{
return Collections.unmodifiableList(provider.getLocators());
}
return Collections.emptyList();
}
private void addLocatorProviderStrategies(final LocatorProviderSelectionStrategy providerSelector) {
providerSelector.addDefaultStrategy(new DefaultJSFAppConfigLocatorProviderStrategy());
providerSelector.addExtensionStrategy(new ExtensionPointLocatorProviderStrategy());
providerSelector.addTestableStrategy(new TestableLocatorProviderStrategy());
}
private static class TestableLocatorProviderStrategy extends
TestableProjectFactoryStrategy<IJSFAppConfigLocatorProvider> {
public TestableLocatorProviderStrategy() {
super(TESTABLE_FACTORY_SESSION_KEY);
}
};
private static class ExtensionPointLocatorProviderStrategy extends
JSFAppConfigLocatorProviderStrategy {
public IJSFAppConfigLocatorProvider perform(final IProject input) throws Exception {
final JSFAppConfigLocatorProviderExtensionPointReader reader = new JSFAppConfigLocatorProviderExtensionPointReader();
final List<IJSFAppConfigLocatorProvider> res = reader.getExtensions();
if (res != null && res.size() > 0) {
return res.get(0);
}
return getNoResult();
}
}
private static class LocatorProviderSelectionStrategy
extends
AbstractTestableExtensibleDefaultProviderSelectionStrategy<IProject, IJSFAppConfigLocatorProvider> {
private static final IJSFAppConfigLocatorProvider NO_RESULT = null;
@Override
public IJSFAppConfigLocatorProvider getNoResult() {
return NO_RESULT;
}
}
private static class JSFAppConfigLocatorProviderExtensionPointReader extends
AbstractSimpleClassExtensionRegistryReader<IJSFAppConfigLocatorProvider> {
private static final String EXT_PT_ID = "jsfAppConfigLocatorProviderFactory"; //$NON-NLS-1$
private static final String EXT_PT_ELEMENT = "locatorProvider"; //$NON-NLS-1$
private static final String EXT_PT_ATTR = "class"; //$NON-NLS-1$
protected JSFAppConfigLocatorProviderExtensionPointReader() {
super(
org.eclipse.jst.jsf.core.internal.JSFCorePlugin.PLUGIN_ID,
EXT_PT_ID, EXT_PT_ELEMENT, EXT_PT_ATTR,
new CompareOrgEclipseJstContributorsLastComparator<IJSFAppConfigLocatorProvider>()
);
}
@Override
protected void handleLoadFailure(final CoreException ce) {
org.eclipse.jst.jsf.core.internal.JSFCorePlugin.log(ce,
"Error loading JSFAppConfigLocatorProvider from extension"); //$NON-NLS-1$
}
}
}