com.github.bomas.concat.ConcatMojo.java Source code

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Here is the source code for com.github.bomas.concat.ConcatMojo.java

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package com.github.bomas.concat;

/*
 * Copyright 2001-2005 The Apache Software Foundation.
 *
 * 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.
 */

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;

/**
 * Goal which concatenates several files and creates a new file as specified.
 * 
 * @Mojo( name = "concat" )
 * @goal concat
 * 
 * @Mojo( defaultPhase = "process-sources" )
 * @phase process-sources
 */
public class ConcatMojo extends AbstractMojo {

    /**
     * The resulting file
     * 
     * @parameter
     * @required
     */
    private File outputFile;

    /**
     * Files to concatenate
     * 
     * @parameter
     * @required
     */
    private List<File> concatFiles;

    /**
     * Append newline after each concatenation
     * 
     * @parameter
     */
    private boolean appendNewline = false;

    /* (non-Javadoc)
     * @see org.apache.maven.plugin.AbstractMojo#execute()
     */
    public void execute() throws MojoExecutionException {
        if (validate()) {
            getLog().debug("Going to concatenate files to destination file: " + outputFile.getAbsolutePath());
            try {
                for (File inputFile : concatFiles) {
                    getLog().debug("Concatenating file: " + inputFile.getAbsolutePath());
                    String input = FileUtils.readFileToString(inputFile);
                    FileUtils.writeStringToFile(outputFile, input, true);
                    if (appendNewline) {
                        FileUtils.writeStringToFile(outputFile, System.getProperty("line.separator"), true);
                    }

                }
            } catch (IOException e) {
                throw new MojoExecutionException("Failed to concatenate", e);
            }
        }
    }

    private boolean validate() throws MojoExecutionException {
        if (outputFile == null) {
            throw new MojoExecutionException("Please specify a correct outPutFile");
        }

        if (concatFiles == null || concatFiles.size() == 0) {
            throw new MojoExecutionException("Please specify the file(s) to concatenate");
        } else {
            for (File file : concatFiles) {
                if (!file.exists()) {
                    throw new MojoExecutionException(file.getAbsolutePath() + " does not exists.");
                }
            }

        }

        return true;
    }
}