com.zaubersoftware.mule.module.jenkins.template.velocity.VelocityTemplate.java Source code

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Here is the source code for com.zaubersoftware.mule.module.jenkins.template.velocity.VelocityTemplate.java

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/**
 * Copyright (c) 2011 Zauber S.A. <http://www.zaubersoftware.com>
 *
 * 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 com.zaubersoftware.mule.module.jenkins.template.velocity;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Map;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.UnhandledException;
import org.apache.commons.lang.Validate;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.springframework.core.io.Resource;

import com.zaubersoftware.mule.module.jenkins.template.Template;

/**
 * Velocity template
 *
 * @author Juan F. Codagnone
 * @since Mar 27, 2011
 */
public class VelocityTemplate implements Template {
    static {
        try {
            Velocity.init();
        } catch (final Exception e) {
            throw new UnhandledException(e);
        }
    }

    private final String message;

    /**
     * Creates the VelocityTemplate.
     *
     */
    public VelocityTemplate(final Resource content, final String charset) {
        Validate.notNull(content);
        Validate.notNull(charset);

        InputStream is = null;
        try {
            is = content.getInputStream();
            final ByteArrayOutputStream os = new ByteArrayOutputStream();
            IOUtils.copy(is, os);
            os.close();
            message = os.toString(charset);
        } catch (final IOException e) {
            throw new UnhandledException(e);
        } finally {
            IOUtils.closeQuietly(is);
        }
    }

    @Override
    public final String render(final Map<String, ?> model) {
        final StringWriter writer = new StringWriter();
        final VelocityContext context = new VelocityContext(model);
        try {
            Velocity.evaluate(context, writer, "message", new StringReader(message));
        } catch (final Exception e) {
            throw new RuntimeException(e);
        }

        return writer.toString();
    }
}