deafaultnodetemplatefactory.java

jsp + xmｌ实现ｔｒｅｅｖｉｅｗ

/*
 * ====================================================================
 * The JSP Tree Software License, Version 1.1
 *
 * (this license is derived and fully compatible with the Apache Software
 * License - see http://www.apache.org/LICENSE.txt)
 *
 * Copyright (c) 2002-2005 jsptree.sourceforge.net . All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by
 *        jsptree.sourceforge.net (http://jsptree.sourceforge.net/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The name "JSP Tree" must not be used to endorse or promote
 *    products derived from this software without prior written permission.
 *    For written permission, please contact [e-mail] .
 *
 * 5. Products derived from this software may not be called "JSP Tree",
 *    nor may "JSP Tree" appear in their name, without prior written
 *    permission of jsptree.sourceforge.net.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 */

package net.sf.jsptree.template;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;

/**
 * @author Vladislav Kamensky
 */
public class DeafaultNodeTemplateFactory implements NodeTemplateFactory {

    private static Logger LOG = Logger.getLogger(DeafaultNodeTemplateFactory.class);

    private static Map m_map = new HashMap();

    private Map m_templates = Collections.synchronizedMap(new HashMap());

    private String m_templatesPath = null;

    private DeafaultNodeTemplateFactory(String p_templatePath, String[] p_templates) {
        m_templatesPath = p_templatePath;
        loadTemplates(p_templatePath, p_templates);
    }

    public synchronized static DeafaultNodeTemplateFactory getInstance(String p_templatePath, String[] p_templates) {
        if (LOG.isInfoEnabled()) {
            LOG.info("Getting DeafaultNodeTemplateFactory for path: " + p_templatePath);
        }
        if (!m_map.containsKey(p_templatePath)) {
            m_map.put(p_templatePath, new DeafaultNodeTemplateFactory(p_templatePath, p_templates));
            if (LOG.isInfoEnabled()) {
                LOG.info("New DeafaultNodeTemplateFactory was created");
            }
        }
        return (DeafaultNodeTemplateFactory) m_map.get(p_templatePath);
    }

    public NodeTemplate getTemplate(String p_name) {
        NodeTemplateImpl a_nodeTemplate = (NodeTemplateImpl) m_templates.get(p_name);
        if (a_nodeTemplate == null) {
            return new NullNodeTemplate();
        }

        return a_nodeTemplate;
    }

    public void loadTemplates(String[] p_templates) {
        loadTemplates(m_templatesPath, p_templates);
    }

    private void loadTemplates(String p_templatePath, String[] p_templates) {
        InputStream a_inputStream = null;

        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        if (classLoader == null) {
            classLoader = this.getClass().getClassLoader();
        }

        for (int i = 0; i < p_templates.length; i++) {
            String a_tmplPath = p_templatePath + p_templates[i];

            a_inputStream = classLoader.getResourceAsStream(a_tmplPath);

            if (a_inputStream == null) {
                if (LOG.isInfoEnabled()) {
                    LOG.info("Template path: " + a_tmplPath + " cann't be accessed");
                }
                continue;
            }
            try {
                BufferedReader a_reader
                        = new BufferedReader(new InputStreamReader(a_inputStream));
                StringBuffer a_buffer = new StringBuffer();
                for (String a_line = a_reader.readLine(); a_line != null; a_line = a_reader.readLine()) {

                    a_buffer.append(a_line);
                }
                NodeTemplateImpl a_nodeTemplate = new NodeTemplateImpl(a_buffer.toString());
                m_templates.put(p_templates[i], a_nodeTemplate);
            } catch (IOException e) {
                LOG.error("Template path: " + a_tmplPath + " cann't be accessed", e);
                continue;
            } finally {
                if (a_inputStream != null) {
                    try {
                        a_inputStream.close();
                    } catch (IOException ignored) {
                    }
                }
            }

        }

    }
}