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/*
* 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.tuscany.sca.domain.search;
import java.util.HashMap;
import org.apache.tuscany.sca.domain.search.impl.Document;
/**
* A map that holds a collection of {@link Document}s. Each {@link Document} key
* should ideally be something that is unique across the entire contribution
* documents. This class overrides {@link HashMap#get(Object)} method, so it
* adds an empty {@link Document} object if the specified key is not found in
* the map.
*
* @version $Rev$ $Date$
*/
public class DocumentMap extends HashMap<Object, Document> {
private static final long serialVersionUID = -2402910290314939928L;
/**
* Returns a {@link Document} object mapped from the specified key. If no
* {@link Document} object is found from the specified key, a empty
* {@link Document} object is created and added to the map.
*
* @param key the {@link Document} key
* @return the {@link Document} object mapped from the key
*/
@Override
public Document get(Object key) {
Document doc = super.get(key);
if (doc == null) {
doc = new Document();
put(key, doc);
}
return doc;
}
}
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