DocumentLibrary.java

/*
 * ModeShape (http://www.modeshape.org)
 *
 * Licensed 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.modeshape.schematic;

import org.modeshape.schematic.document.Document;

/**
 * A library of JSON documents.
 * 
 * @author Randall Hauch <rhauch@redhat.com> (C) 2011 Red Hat Inc.
 */
public interface DocumentLibrary {

    /**
     * Get the name of this library.
     * 
     * @return the library name; never null
     */
    String getName();

    /**
     * Get the document with the supplied key.
     * 
     * @param key the key or identifier for the document
     * @return the document, or null if there was no document with the supplied key
     */
    Document get( String key );

    /**
     * Store the supplied document at the given key.
     * 
     * @param key the key or identifier for the document
     * @param document the document that is to be stored
     * @return the document that was previously stored at this key, or null if there was no document with the supplied key
     */
    Document put( String key,
                  Document document );

    /**
     * Store the supplied document at the given key.
     * 
     * @param key the key or identifier for the document
     * @param document the document that is to be stored
     * @return the document that was previously stored at this key, or null if there was no document with the supplied key
     */
    Document putIfAbsent( String key,
                          Document document );

    /**
     * Replace the existing document at the given key with the document that is supplied. This method does nothing if there is no
     * document at the given key.
     * 
     * @param key the key or identifier for the document
     * @param document the document that is to replace the existing document
     * @return the document that was replaced, or null if nothing was replaced
     */
    Document replace( String key,
                      Document document );

    /**
     * Remove the existing document at the given key.
     * 
     * @param key the key or identifier for the document
     * @return the document that was removed, or null if there was no document with the supplied key
     */
    Document remove( String key );

}