| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.stanbol.enhancer.contentitem.inmemory; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import org.apache.clerezza.commons.rdf.Graph; |
| import org.apache.clerezza.commons.rdf.IRI; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Properties; |
| import org.apache.felix.scr.annotations.Property; |
| import org.apache.felix.scr.annotations.Service; |
| import org.apache.stanbol.enhancer.servicesapi.Blob; |
| import org.apache.stanbol.enhancer.servicesapi.ContentItem; |
| import org.apache.stanbol.enhancer.servicesapi.ContentItemFactory; |
| import org.apache.stanbol.enhancer.servicesapi.ContentSink; |
| import org.apache.stanbol.enhancer.servicesapi.ContentSource; |
| import org.apache.stanbol.enhancer.servicesapi.helper.ContentItemHelper; |
| import org.apache.stanbol.enhancer.servicesapi.impl.AbstractContentItemFactory; |
| import org.osgi.framework.Constants; |
| @Component(inherit=true) |
| @Service(value=ContentItemFactory.class) |
| @Properties(value={ |
| //set service ranking to an positive integer so that others do not accitently |
| //override the default |
| @Property(name=Constants.SERVICE_RANKING,intValue=100) |
| }) |
| public class InMemoryContentItemFactory extends AbstractContentItemFactory implements ContentItemFactory { |
| |
| private static InMemoryContentItemFactory instance; |
| /** |
| * Getter for the singleton instance of this factory. Within an OSGI |
| * environment this should not be used as this Factory is also registered |
| * as OSGI service. |
| * @return the singleton instance |
| */ |
| public static InMemoryContentItemFactory getInstance(){ |
| if(instance == null){ |
| instance = new InMemoryContentItemFactory(); |
| } |
| return instance; |
| } |
| |
| public InMemoryContentItemFactory() { |
| super(true); //lazy initialisation makes a lot of sense for in-memory implementations |
| } |
| |
| @Override |
| protected ContentItem createContentItem(IRI id, Blob blob, Graph metadata) { |
| return new InMemoryContentItem(id, blob, metadata); |
| } |
| |
| @Override |
| protected ContentItem createContentItem(String prefix, Blob blob, Graph metadata) { |
| return new InMemoryContentItem(ContentItemHelper.makeDefaultUri(prefix, blob), blob, metadata); |
| } |
| |
| @Override |
| public Blob createBlob(ContentSource source) throws IOException { |
| if(source == null){ |
| throw new IllegalArgumentException("The parsed ContentSource MUST NOT be NULL!"); |
| } |
| //use source.getData to avoid making copies of byte arrays |
| return new InMemoryBlob(source.getData(), source.getMediaType(),null); |
| } |
| |
| @Override |
| public ContentSink createContentSink(String mediaType) throws IOException { |
| return new InMemoryContentSink(mediaType); |
| } |
| |
| |
| protected static class InMemoryContentSink implements ContentSink { |
| |
| private final ByteArrayOutputStream out; |
| private final InMemoryBlob blob; |
| |
| protected InMemoryContentSink(String mt){ |
| out = new ByteArrayOutputStream(); |
| blob = new InMemoryBlob(out, mt, null); |
| } |
| |
| @Override |
| public OutputStream getOutputStream() { |
| return out; |
| } |
| |
| @Override |
| public Blob getBlob() { |
| return blob; |
| } |
| |
| } |
| } |