java.fedora.client.objecteditor.ContentHandlerFactory Maven / Gradle / Ivy

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The Fedora Client is a Java Library that allows API access to a Fedora Repository. The client is typically one part of a full Fedora installation.

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/*
 * -----------------------------------------------------------------------------
 *
 * License and Copyright: The contents of this file are subject to 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.fedora-commons.org/licenses.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * The entire file consists of original code.
 * Copyright © 2008 Fedora Commons, Inc.

 * 
Copyright © 2002-2007 The Rector and Visitors of the University of 
 * Virginia and Cornell University
 
 * All rights reserved.
 *
 * -----------------------------------------------------------------------------
 */
package fedora.client.objecteditor;

import java.io.InputStream;
import java.io.IOException;
import java.util.HashMap;

/**
 * Provides type-appropriate ContentViewer and ContentEditor instances.
 * 
 */
public abstract class ContentHandlerFactory {

    private static HashMap s_viewers;
    private static HashMap s_editors;

    static {
        s_viewers=new HashMap();
        s_editors=new HashMap();
    }

    /**
     * Registers a viewer or editor with the factory.  Before the factory
     * is used, all needed editors and viewers should be registered (in that
     * order).  Order is important here because all editors are considered
     * viewers by default.  If a separate viewer is registered after an
     * editor that handles the same type, that viewer will be the one provided
     * via getViewer.  In general, the last viewers/editors passed in will
     * have the most precendence.
     */
    public static void register(ContentViewer handler) {
        if (handler.isEditor()) {
            String[] types=handler.getTypes();
            for (int i=0; i