com.samaxes.maven.minify.plugin.ProcessCSSFilesTask Maven / Gradle / Ivy

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Combine and minimize JavaScript and CSS files for faster page loading.
There is a newer version: 1.7.6
/*
 * $Id$
 *
 * Minify Maven Plugin
 * https://github.com/samaxes/minify-maven-plugin
 *
 * Copyright (c) 2009 samaxes.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.samaxes.maven.minify.plugin;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.List;

import org.apache.maven.plugin.logging.Log;
import org.codehaus.plexus.util.IOUtil;

import com.yahoo.platform.yui.compressor.CssCompressor;

/**
 * Task for merging and compressing CSS files.
 */
public class ProcessCSSFilesTask extends ProcessFilesTask {

    /**
     * Task constructor.
     *
     * @param log Maven plugin log
     * @param bufferSize size of the buffer used to read source files
     * @param debug show source file paths in log output
     * @param skipMerge whether to skip the merge step or not
     * @param skipMinify whether to skip the minify step or not
     * @param webappSourceDir web resources source directory
     * @param webappTargetDir web resources target directory
     * @param inputDir directory containing source files
     * @param sourceFiles list of source files to include
     * @param sourceIncludes list of source files to include
     * @param sourceExcludes list of source files to exclude
     * @param outputDir directory to write the final file
     * @param outputFilename the output file name
     * @param suffix final filename suffix
     * @param nosuffix whether to use a suffix for the minified filename or not
     * @param charset if a character set is specified, a byte-to-char variant allows the encoding to be selected.
     *        Otherwise, only byte-to-byte operations are used
     * @param linebreak split long lines after a specific column
     */
    public ProcessCSSFilesTask(Log log, Integer bufferSize, boolean debug, boolean skipMerge, boolean skipMinify,
            String webappSourceDir, String webappTargetDir, String inputDir, List sourceFiles,
            List sourceIncludes, List sourceExcludes, String outputDir, String outputFilename,
            String suffix, boolean nosuffix, String charset, int linebreak) {
        super(log, bufferSize, debug, skipMerge, skipMinify, webappSourceDir, webappTargetDir, inputDir, sourceFiles,
                sourceIncludes, sourceExcludes, outputDir, outputFilename, suffix, nosuffix, charset, linebreak);
    }

    /**
     * Minifies CSS file.
     *
     * @param mergedFile input file resulting from the merged step
     * @param minifiedFile output file resulting from the minify step
     */
    @Override
    void minify(File mergedFile, File minifiedFile) {
        if (minifiedFile != null) {
            try {
                log.info("Creating minified file [" + ((debug) ? minifiedFile.getPath() : minifiedFile.getName())
                        + "].");

                InputStream in = new FileInputStream(mergedFile);
                OutputStream out = new FileOutputStream(minifiedFile);
                InputStreamReader reader;
                OutputStreamWriter writer;
                if (charset == null) {
                    reader = new InputStreamReader(in);
                    writer = new OutputStreamWriter(out);
                } else {
                    reader = new InputStreamReader(in, charset);
                    writer = new OutputStreamWriter(out, charset);
                }

                CssCompressor compressor = new CssCompressor(reader);
                compressor.compress(writer, linebreak);

                IOUtil.close(reader);
                IOUtil.close(writer);
                IOUtil.close(in);
                IOUtil.close(out);
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
        }
    }
}