com.carmatech.maven.utils.MergeUtils.java Source code

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Here is the source code for com.carmatech.maven.utils.MergeUtils.java

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/*******************************************************************************
 * Copyright 2012-2014 Marc CARRE
 * 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.carmatech.maven.utils;

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

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;

import com.google.common.io.Files;

public final class MergeUtils {

    private MergeUtils() {
        // Pure utility class, do NOT instantiate.
    }

    public static PropertiesConfiguration toProperties(final File propertiesFile) throws IOException {
        try {
            return new PropertiesConfiguration(propertiesFile);
        } catch (ConfigurationException e) {
            throw new IOException("Unable to load properties file " + propertiesFile, e);
        }
    }

    public static void savePropertiesTo(final File targetFile, final PropertiesConfiguration properties,
            final String comment) throws IOException {
        properties.setHeader(comment);
        try {
            Files.createParentDirs(targetFile);
            properties.save(targetFile);
        } catch (ConfigurationException e) {
            throw new IOException("Unable to save properties file " + targetFile);
        }
    }

    public static void putAll(final PropertiesConfiguration target, final PropertiesConfiguration source) {
        for (final Iterator<String> sourceKeys = source.getKeys(); sourceKeys.hasNext();) {
            final String key = sourceKeys.next();
            final Object value = source.getProperty(key);
            target.setProperty(key, value);
        }
    }

    public static <T> String generateComment(final Class<T> clazz) {
        return "File merged by properties-files-maven-plugin, using " + clazz.getSimpleName() + ", at:";
    }
}