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/**
* Arara, the cool TeX automation tool
* Copyright (c) 2012 -- 2019, Paulo Roberto Massa Cereda
* 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. Neither the name of the project's author nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS 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
* COPYRIGHT HOLDER OR 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 com.github.cereda.arara.utils;
import com.github.cereda.arara.controller.LanguageController;
import com.github.cereda.arara.model.AraraException;
import com.github.cereda.arara.model.Messages;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Map;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.RuntimeConstants;
/**
* Implements the template merging from Apache Velocity.
* @author Paulo Roberto Massa Cereda
* @version 4.0
* @since 4.0
*/
public class VelocityUtils {
// the language controller
private static final LanguageController messages =
LanguageController.getInstance();
/**
* Merges the provided template with the context map and writes the result
* in an output file. The operation relies on the Apache Velocity project.
* @param input The input file.
* @param output The output file.
* @param map The context map.
* @throws AraraException Something terribly wrong happened, to be caught
* in the higher levels.
*/
public static void mergeVelocityTemplate(File input, File output,
Map<String, Object> map) throws AraraException {
// let us try
try {
// create the template engine instance
VelocityEngine engine = new VelocityEngine();
// use the resource path trick: set the default
// location to the input file's parent directory,
// so our file is easily located
engine.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH,
input.getCanonicalFile().getParent());
// set the logging feature of Apache Velocity to
// register the occurrences in a null provider
// (we do not want unnecessary verbose output)
engine.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS,
"org.apache.velocity.runtime.log.NullLogSystem");
// init the engine with the
// provided settings
engine.init();
// create a context for Apache Velocity,
// based on the provided map
VelocityContext context = new VelocityContext(map);
// get the template from the engine and
// read it as an UTF-8 file
Template template = engine.getTemplate(input.getName(), "UTF-8");
// create an output stream from
// the file output reference
FileOutputStream stream = new FileOutputStream(output);
// create a writer based on the
// previously created stream
Writer writer = new OutputStreamWriter(stream, "UTF-8");
// merge the context map with the
// template file and write the result
// to the output stream writer
template.merge(context, writer);
// close both writer
// and output stream
writer.close();
stream.close();
} catch(ResourceNotFoundException rnfexception) {
throw new AraraException(
messages.getMessage(
Messages.ERROR_VELOCITY_FILE_NOT_FOUND
),
rnfexception
);
} catch(ParseErrorException peexception) {
throw new AraraException(
messages.getMessage(
Messages.ERROR_VELOCITY_PARSE_EXCEPTION
),
peexception
);
} catch(MethodInvocationException miexception) {
throw new AraraException(
messages.getMessage(
Messages.ERROR_VELOCITY_METHOD_INVOCATION_EXCEPTION
),
miexception
);
} catch (IOException ioexception) {
throw new AraraException(
messages.getMessage(
Messages.ERROR_VELOCITY_FILE_NOT_FOUND
),
ioexception
);
}
}
}
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