org.codehaus.mojo.properties.AbstractWritePropertiesMojo Maven / Gradle / Ivy

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The Properties Maven Plugin is here to make life a little easier when dealing with properties. It provides goals to read and write properties from files. The Kuali version of this plugin adds support for loading properties from XML files and reading properties files from any location Spring resource loading can understand (eg classpath:myprops.properties)

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/**
 * Copyright 2009-2012 The Kuali Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
 *
 * 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 org.codehaus.mojo.properties;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Properties;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.util.StringUtils;

/**
 * @author Zarar Siddiqi
 * @version $Id: AbstractWritePropertiesMojo.java 8861 2009-01-21 15:35:38Z pgier $
 */
public abstract class AbstractWritePropertiesMojo extends AbstractMojo {

	/**
	 * @parameter default-value="${project}"
	 * @required
	 * @readonly
	 */
	MavenProject project;

	/**
	 * The file that properties will be written to
	 *
	 * @parameter expression="${properties.outputFile}" default-value="${project.build.directory}/properties/project.properties";
	 * @required
	 */
	File outputFile;

	/**
	 * Either NORMAL or ENVIRONMENT_VARIABLE. When set to ENVIRONMENT_VARIABLE the keys in the
	 * properties file will all be upper case with periods replaced by underscores.
	 *
	 * @parameter expression="${properties.outputStyle}" default-value="NORMAL"
	 * @required
	 */
	OutputStyle outputStyle;

	/**
	 * If supplied property keys are prefixed with this value before being stored.
	 *
	 * @parameter expression="${properties.prefix}"
	 */
	String prefix;

	protected void writeProperties(File file, Properties properties, OutputStyle outputStyle, String prefix) throws MojoExecutionException {
		Properties prefixed = getPrefixedProperties(properties, prefix);
		Properties formatted = getFormattedProperties(prefixed, outputStyle);
		Properties sorted = getSortedProperties(formatted);
		OutputStream out = null;
		try {
			out = FileUtils.openOutputStream(file);
			sorted.store(out, "Created by the properties-maven-plugin");
		} catch (IOException e) {
			throw new MojoExecutionException("Error creating properties file", e);
		} finally {
			IOUtils.closeQuietly(out);
		}
	}

	protected SortedProperties getSortedProperties(Properties properties) {
		SortedProperties sp = new SortedProperties();
		sp.putAll(properties);
		return sp;
	}

	protected Properties getFormattedProperties(Properties properties, OutputStyle style) {
		switch (style) {
		case NORMAL:
			return properties;
		case ENVIRONMENT_VARIABLE:
			return getEnvironmentVariableProperties(properties);
		default:
			throw new IllegalArgumentException(outputStyle + " is unknown");
		}
	}

	protected Properties getPrefixedProperties(Properties properties, String prefix) {
		if (StringUtils.isBlank(prefix)) {
			return properties;
		}
		List keys = new ArrayList(properties.stringPropertyNames());
		Collections.sort(keys);
		Properties newProperties = new Properties();
		for (String key : keys) {
			String value = properties.getProperty(key);
			String newKey = prefix + "." + key;
			newProperties.setProperty(newKey, value);
		}
		return newProperties;
	}

	protected Properties getEnvironmentVariableProperties(Properties properties) {
		List keys = new ArrayList(properties.stringPropertyNames());
		Collections.sort(keys);
		Properties newProperties = new Properties();
		for (String key : keys) {
			String value = properties.getProperty(key);
			String newKey = key.toUpperCase().replace(".", "_");
			newProperties.setProperty(newKey, value);
		}
		return newProperties;
	}
}