net.jcreate.e3.table.skin.processor.VelocityHelper.java Source code

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Here is the source code for net.jcreate.e3.table.skin.processor.VelocityHelper.java

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/*
 * Copyright 2002-2005 the original author or authors.
 *
 * 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 net.jcreate.e3.table.skin.processor;

import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

import net.jcreate.e3.templateEngine.Context;

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

/**
 * 
 * @author 
 *
 */
public class VelocityHelper {

    private static Log log = LogFactory.getLog(VelocityHelper.class);

    /**
     * ??VelocityEngineVelocityEngine?
     * ?singleton.
     * @return
     */
    public static VelocityEngine getVeocityEngine(Properties pProperties) throws InitVelocityEngineException {
        VelocityEngine ve = new VelocityEngine();
        try {
            ve.init(pProperties);
        } catch (Exception e) {
            e.printStackTrace();
            final String MSG = "?Velocity!" + e.getMessage();
            if (log.isErrorEnabled()) {
                log.error(MSG);
            }
            throw new InitVelocityEngineException(MSG, e);
        }
        return ve;
    }

    public static Properties getDefaultProperties() throws InitVelocityEngineException {
        InputStream is = VelocityHelper.class.getResourceAsStream("Velocity.properties");
        Properties props = new Properties();
        try {
            props.load(is);
        } catch (IOException e) {
            e.printStackTrace();
            final String MSG = "!" + e.getMessage();
            if (log.isErrorEnabled()) {
                log.error("!" + e.getMessage());
            }
            throw new InitVelocityEngineException(MSG, e);
        }
        return props;
    }

    public static VelocityContext context2VelocityContext(Context pContext) {
        if (pContext == null) {
            return null;
        }
        VelocityContext result = new VelocityContext();
        Map params = pContext.getParameters();
        for (Iterator i = params.keySet().iterator(); i.hasNext();) {
            String key = (String) i.next();
            Object value = params.get(key);
            result.put(key, value);
        }
        return result;
    }

}