001/*
002 *  Copyright 2016 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.cms.content.external;
017
018import java.util.HashSet;
019import java.util.Set;
020
021import org.ametys.cms.repository.Content;
022import org.ametys.runtime.plugin.component.AbstractThreadSafeComponentExtensionPoint;
023
024/**
025 * Extension point for {@link ExternalizableMetadataProvider}s.
026 */
027public class ExternalizableMetadataProviderExtensionPoint extends AbstractThreadSafeComponentExtensionPoint<ExternalizableMetadataProvider>
028{
029    /** Avalon Role */
030    public static final String ROLE = ExternalizableMetadataProviderExtensionPoint.class.getName();
031    
032    /**
033     * Get the path of metadata that can be valued externally or locally by a {@link ExternalizableMetadataProvider}
034     * @param content The content
035     * @return The path of external or local metadata
036     */
037    public Set<String> getExternalAndLocalMetadata (Content content)
038    {
039        Set<String> metadataPaths = new HashSet<>();
040        
041        for (String id : getExtensionsIds())
042        {
043            ExternalizableMetadataProvider provider = getExtension(id);
044            
045            for (String metadataPath : provider.getExternalAndLocalMetadata(content))
046            {
047                if (metadataPaths.contains(metadataPath))
048                {
049                    throw new UnsupportedOperationException("The metadata of path " + metadataPath + " is already handled by a externalisable metadata provider");
050                }
051                metadataPaths.add(metadataPath);
052            }
053        }
054        return metadataPaths;
055    }
056    
057}