src/main/java/org/apache/maven/plugins/changes/ChangesCheckMojo.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.maven.plugins.changes;

import java.io.File;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Locale;

import org.apache.commons.lang.StringUtils;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.plugins.changes.model.Release;

/**
 * Goal which checks that the changes.xml file has the necessary data to generate an announcement or a report for the
 * current release.
 *
 * @author Justin Edelson
 * @author Dennis Lundberg
 * @since 2.4
 */
@Mojo(name = "changes-check", threadSafe = true)
public class ChangesCheckMojo extends AbstractChangesMojo {
    /**
     * The format that a correct release date should have. This value will be used as a pattern to try to parse a date.
     */
    @Parameter(property = "changes.releaseDateFormat", defaultValue = "yyyy-MM-dd")
    private String releaseDateFormat;

    /**
     * The locale that a correct release date should have. This value will be used as a locale to try to parse a date.
     *
     * @since 2.10
     */
    @Parameter(property = "changes.releaseDateLocale")
    private String releaseDateLocale;

    /**
     * Version of the artifact.
     */
    @Parameter(property = "changes.version", defaultValue = "${project.version}", required = true)
    private String version;

    /**
     * The path of the <code>changes.xml</code> file that will be checked.
     */
    @Parameter(property = "changes.xmlPath", defaultValue = "src/changes/changes.xml")
    private File xmlPath;

    /**
     * Flag controlling snapshot processing. If set, versions ending with <code>-SNAPSHOT</code> won't be checked.
     *
     * @since 2.7
     */
    @Parameter(property = "changes.skipSnapshots", defaultValue = "false")
    private boolean skipSnapshots;

    /**
     * Check that the latest release contains a valid release date.
     *
     * @throws MojoExecutionException in case of errors.
     */
    public void execute() throws MojoExecutionException {
        // Run only at the execution root
        if (runOnlyAtExecutionRoot && !isThisTheExecutionRoot()) {
            getLog().info("Skipping the changes check in this project because it's not the Execution Root");
        } else {
            if (this.version.endsWith("-SNAPSHOT") && this.skipSnapshots) {
                getLog().info("Skipping snapshot version '" + this.version + "'.");
            } else if (xmlPath.exists()) {
                ChangesXML xml = new ChangesXML(xmlPath, getLog());
                ReleaseUtils releaseUtils = new ReleaseUtils(getLog());
                Release release = releaseUtils.getLatestRelease(xml.getReleaseList(), version);

                if (!isValidDate(release.getDateRelease(), releaseDateFormat, releaseDateLocale)) {
                    throw new MojoExecutionException(
                            "The file " + xmlPath.getAbsolutePath() + " has an invalid release date.");
                }
            } else {
                getLog().warn("The file " + xmlPath.getAbsolutePath() + " does not exist.");
            }
        }
    }

    /**
     * Use the pattern to try to parse a Date from the given string. Kept for backward compatibility with existing unit
     * tests.
     *
     * @param string A date as text
     * @param pattern A pattern that can be used by {@link SimpleDateFormat}
     * @return <code>true</code> if the string can be parsed as a date using the pattern, otherwise <code>false</code>
     */
    protected static boolean isValidDate(String string, String pattern) {
        return isValidDate(string, pattern, null);
    }

    /**
     * Use the pattern to try to parse a Date from the given string using the given Locale.
     *
     * @param string A date as text
     * @param pattern A pattern that can be used by {@link SimpleDateFormat}
     * @param locale A locale that can be used by {@link SimpleDateFormat}
     * @return <code>true</code> if the string can be parsed as a date using the pattern, otherwise <code>false</code>
     */
    protected static boolean isValidDate(String string, String pattern, String locale) {
        if (StringUtils.isEmpty(string)) {
            return false;
        }

        if (StringUtils.isEmpty(pattern)) {
            return false;
        }

        try {
            Locale usedLocale = null;

            if (StringUtils.isEmpty(locale)) {
                // No locale specified, use the default locale as default value
                // The same behavior as before the locale parameter was added
                usedLocale = Locale.getDefault();
            } else {
                // Try to find the specified locale on this system
                Locale[] locales = Locale.getAvailableLocales();
                for (Locale value : locales) {
                    if (value.toString().equals(locale)) {
                        usedLocale = value;
                        break;
                    }
                }

                if (usedLocale == null) {
                    // The use specified locale was not found on this system,
                    // use the default locale as default value
                    usedLocale = Locale.getDefault();
                }
            }

            SimpleDateFormat df = new SimpleDateFormat(pattern, usedLocale);
            df.parse(string);
            return true;
        } catch (ParseException e) {
            return false;
        }
    }
}