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/*******************************************************************************
* Copyright (c) 2008, 2018 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
* Compeople AG (Stefan Liebig) - various ongoing maintenance
* Mykola Nikishov - maintenance and documentation
*******************************************************************************/
package org.eclipse.equinox.p2.repository.tools.comparator;
import java.util.*;
import java.util.stream.Collectors;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.RegistryFactory;
import org.eclipse.equinox.internal.p2.artifact.repository.Messages;
import org.eclipse.osgi.util.NLS;
/**
* @since 2.0
*/
public class ArtifactComparatorFactory {
private static final String COMPARATOR_POINT = "org.eclipse.equinox.p2.artifact.repository.artifactComparators"; //$NON-NLS-1$
private static final String ATTR_ID = "id"; //$NON-NLS-1$
private static final String ATTR_CLASS = "class"; //$NON-NLS-1$
/**
* Find artifact comparator by comparator's extension id.
*
* @param comparatorID id of the extension contributed to <code>org.eclipse.equinox.p2.artifact.repository.artifactComparators</code> extension point
* @return if found, instance of artifact comparator
* @throws {@link IllegalArgumentException} otherwise
*/
public static IArtifactComparator getArtifactComparator(String comparatorID) {
List<IConfigurationElement> extensions = Arrays.asList(RegistryFactory.getRegistry().getConfigurationElementsFor(COMPARATOR_POINT));
Optional<IArtifactComparator> artifactComparator = findComparatorConfiguration(comparatorID, extensions).map(ArtifactComparatorFactory::createArtifactComparator);
if (artifactComparator.isPresent())
return artifactComparator.get();
if (comparatorID != null) {
String comparators = extensions.stream().map(extension -> extension.getAttribute(ATTR_ID)).collect(Collectors.joining(", ")); //$NON-NLS-1$
throw new IllegalArgumentException(NLS.bind(Messages.exception_comparatorNotFound, comparatorID, comparators));
}
throw new IllegalArgumentException(Messages.exception_noComparators);
}
private static Optional<IConfigurationElement> findComparatorConfiguration(String comparatorID, List<IConfigurationElement> extensions) {
if (comparatorID == null && extensions.size() > 0) {
return Optional.ofNullable(extensions.get(0)); //just take the first one
}
return extensions.stream().filter(extension -> extension.getAttribute(ATTR_ID).equals(comparatorID)).findAny();
}
private static IArtifactComparator createArtifactComparator(IConfigurationElement element) {
try {
Object execExt = element.createExecutableExtension(ATTR_CLASS);
if (execExt instanceof IArtifactComparator)
return (IArtifactComparator) execExt;
} catch (Exception e) {
//fall through
}
return null;
}
}
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