Copyright (c) 2011, 2017 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2011, 2017 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.team.internal.core.importing;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.team.core.RepositoryProviderType;
import org.eclipse.team.core.ScmUrlImportDescription;
import org.eclipse.team.core.importing.provisional.BundleImporterDelegate;
import org.eclipse.team.core.importing.provisional.IBundleImporter;
import org.eclipse.team.core.importing.provisional.IBundleImporterDelegate;
import org.eclipse.team.internal.core.TeamPlugin;

A bundle importer extension.
Since:
3.7/**
 * A bundle importer extension.
 *
 * @since 3.7
 */
public class BundleImporterExtension implements IBundleImporter {

	private IBundleImporterDelegate delegate;
	private IConfigurationElement element;

	
Constructs a bundle importer extension on the given element.
Params:
element – contribution/**
	 * Constructs a bundle importer extension on the given element.
	 *
	 * @param element contribution
	 */
	public BundleImporterExtension(IConfigurationElement element) {
		this.element = element;
	}

	@Override
	public ScmUrlImportDescription[] validateImport(Map[] manifests) {
		try {
			return getDelegate().validateImport(manifests);
		} catch (CoreException e) {
			TeamPlugin.log(e);
			return null;
		}
	}

	
Returns underlying delegate.
Throws:
CoreException – if unable to instantiate delegate
Returns:
delegate/**
	 * Returns underlying delegate.
	 *
	 * @return delegate
	 * @exception CoreException if unable to instantiate delegate
	 */
	private synchronized IBundleImporterDelegate getDelegate() throws CoreException {
		if (delegate == null) {
			delegate =  new BundleImporterDelegate() {
				private Set<String> supportedValues;
				private RepositoryProviderType providerType;
				@Override
				protected Set getSupportedValues() {
					if (supportedValues == null) {
						IConfigurationElement[] supported = element.getChildren("supports"); //$NON-NLS-1$
						supportedValues = new HashSet<>(supported.length);
						for (IConfigurationElement s : supported) {
							supportedValues.add(s.getAttribute("prefix")); //$NON-NLS-1$
						}
					}
					return supportedValues;
				}
				@Override
				protected RepositoryProviderType getProviderType() {
					if (providerType == null)
						providerType = RepositoryProviderType.getProviderType(element.getAttribute("repository")); //$NON-NLS-1$
					return providerType;
				}
			};
		}
		return delegate;
	}

	@Override
	public IProject[] performImport(ScmUrlImportDescription[] descriptions, IProgressMonitor monitor) throws CoreException {
		return getDelegate().performImport(descriptions, monitor);
	}

	@Override
	public String getId() {
		return element.getAttribute("id"); //$NON-NLS-1$
	}

	@Override
	public String getDescription() {
		return element.getAttribute("description"); //$NON-NLS-1$
	}

	@Override
	public String getName() {
		return element.getAttribute("name"); //$NON-NLS-1$
	}

}