com.googlecode.jsfFlexPlugIn.parser.velocity.JsfFlexVelocityParser.java Source code

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Here is the source code for com.googlecode.jsfFlexPlugIn.parser.velocity.JsfFlexVelocityParser.java

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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 com.googlecode.jsfFlexPlugIn.parser.velocity;

import java.io.IOException;
import java.io.Writer;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;

import com.googlecode.jsfFlexPlugIn.parser.IJsfFlexParserListener;

/**
 * @author Ji Hoon Kim
 */
public class JsfFlexVelocityParser {

    private final static Log _log = LogFactory.getLog(JsfFlexVelocityParser.class);

    private final List<IJsfFlexParserListener> _jsfFlexVelocityParserListeners;
    private final VelocityEngine _velocityEngine;
    private final VelocityContext _context;
    private final Properties _initProperties;

    public JsfFlexVelocityParser() {
        super();
        _initProperties = null;
    }

    public JsfFlexVelocityParser(Properties initProperties) {
        super();
        _initProperties = initProperties;
    }

    {
        _velocityEngine = new VelocityEngine();
        _context = new VelocityContext();
        _jsfFlexVelocityParserListeners = new LinkedList<IJsfFlexParserListener>();
    }

    public void init() {
        try {
            if (_initProperties != null) {
                _velocityEngine.init(_initProperties);
            } else {
                _velocityEngine.init();
            }

        } catch (Exception _exceptionWhileInitializing) {
            throw new RuntimeException(_exceptionWhileInitializing);
        }

    }

    public synchronized void mergeCollectionToTemplate(String template, Map<String, Object> contextInfo,
            Writer targetWriter, String fileMerged) {

        for (String currKey : contextInfo.keySet()) {
            _context.put(currKey, contextInfo.get(currKey));
        }

        try {
            _velocityEngine.mergeTemplate(template, _context, targetWriter);
            targetWriter.flush();

        } catch (Exception exceptionWhileMerging) {
            throw new RuntimeException(exceptionWhileMerging);
        } finally {
            try {
                if (targetWriter != null) {
                    targetWriter.close();
                }
            } catch (IOException closerException) {
                _log.debug("Error in closing the writer within mergeCollectionToTemplate", closerException);
            }
        }

        mergeCollectionToTemplateFinished(fileMerged);
    }

    public synchronized void addParserListener(IJsfFlexParserListener callBack) {
        _jsfFlexVelocityParserListeners.add(callBack);
    }

    private synchronized void mergeCollectionToTemplateFinished(String fileMerged) {
        for (IJsfFlexParserListener mergeCollectionToTemplateCallBack : _jsfFlexVelocityParserListeners) {
            mergeCollectionToTemplateCallBack.mergeCollectionToTemplateFinished(fileMerged);
        }
    }

}