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/*******************************************************************************
* Copyright (c) 2010, 2011 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.core.internal.libval;
import static org.eclipse.jpt.common.core.internal.utility.XPointTools.*;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.expressions.ExpressionConverter;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jpt.common.core.JptCommonCorePlugin;
import org.eclipse.jpt.common.core.internal.utility.XPointTools.XPointException;
import org.eclipse.jpt.common.core.libprov.JptLibraryProviderInstallOperationConfig;
import org.eclipse.jpt.common.core.libval.LibraryValidator;
import org.eclipse.jpt.common.utility.internal.KeyedSet;
import org.eclipse.jpt.common.utility.internal.iterables.FilteringIterable;
import org.eclipse.jpt.common.utility.internal.iterables.TransformationIterable;
public class LibraryValidatorManager {
public static final String EXTENSION_POINT_ID = "libraryValidators"; //$NON-NLS-1$
public static final String QUALIFIED_EXTENSION_POINT_ID = JptCommonCorePlugin.PLUGIN_ID_ + EXTENSION_POINT_ID;
public static final String LIBRARY_VALIDATOR_ELEMENT = "libraryValidator"; //$NON-NLS-1$
public static final String ID_ATTRIBUTE = "id"; //$NON-NLS-1$
public static final String CLASS_ATTRIBUTE = "class"; //$NON-NLS-1$
public static final String ENABLEMENT_ELEMENT = "enablement"; //$NON-NLS-1$
private static LibraryValidatorManager INSTANCE = new LibraryValidatorManager();
public static LibraryValidatorManager instance() {
return INSTANCE;
}
private KeyedSet<String, LibraryValidatorConfig> libraryValidatorConfigs;
private LibraryValidatorManager() {
this.libraryValidatorConfigs = new KeyedSet<String, LibraryValidatorConfig>();
readExtensions();
}
/**
* Return the {@link LibraryValidator}s
*/
public Iterable<LibraryValidator> getLibraryValidators(final JptLibraryProviderInstallOperationConfig config) {
return new FilteringIterable<LibraryValidator>(
new TransformationIterable<LibraryValidatorConfig, LibraryValidator>(
new FilteringIterable<LibraryValidatorConfig>(
this.libraryValidatorConfigs.getItemSet()) {
@Override
protected boolean accept(LibraryValidatorConfig o) {
return o.isEnabledFor(config);
}
}) {
@Override
protected LibraryValidator transform(LibraryValidatorConfig o) {
return o.getLibraryValidator();
}
}) {
@Override
protected boolean accept(LibraryValidator o) {
return o != null;
}
};
}
private void readExtensions() {
final IExtensionRegistry registry = Platform.getExtensionRegistry();
final IExtensionPoint xpoint
= registry.getExtensionPoint(QUALIFIED_EXTENSION_POINT_ID);
if (xpoint == null) {
throw new IllegalStateException();
}
final List<IConfigurationElement> configs = new ArrayList<IConfigurationElement>();
for (IExtension extension : xpoint.getExtensions()) {
for (IConfigurationElement element : extension.getConfigurationElements()) {
configs.add(element);
}
}
for (IConfigurationElement element : configs) {
if (element.getName().equals(LIBRARY_VALIDATOR_ELEMENT)) {
readExtension(element);
}
}
}
private void readExtension(IConfigurationElement element) {
try {
final LibraryValidatorConfig lvConfig = new LibraryValidatorConfig();
// plug-in id
lvConfig.setPluginId(element.getContributor().getName());
// resource locator id
lvConfig.setId(findRequiredAttribute(element, ID_ATTRIBUTE));
if (this.libraryValidatorConfigs.containsKey(lvConfig.getId())) {
logDuplicateExtension(QUALIFIED_EXTENSION_POINT_ID, ID_ATTRIBUTE, lvConfig.getId());
throw new XPointException();
}
// resource locator class name
lvConfig.setClassName(findRequiredAttribute(element, CLASS_ATTRIBUTE));
// enablement
for (IConfigurationElement child : element.getChildren()) {
String childName = child.getName();
if (childName.equals(ENABLEMENT_ELEMENT)) {
Expression expr;
try {
expr = ExpressionConverter.getDefault().perform(child);
}
catch (CoreException e) {
log(e);
throw new XPointException();
}
lvConfig.setEnablementCondition(expr);
}
}
this.libraryValidatorConfigs.addItem(lvConfig.getId(), lvConfig);
}
catch (XPointException e) {
// Ignore and continue. The problem has already been reported to the user
// in the log.
}
}
}
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