org.apache.maven.plugins.enforcer.RequireJavaVersion.java Source code

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Here is the source code for org.apache.maven.plugins.enforcer.RequireJavaVersion.java

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package org.apache.maven.plugins.enforcer;

/*
 * 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.
 */

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.lang.SystemUtils;
import org.apache.maven.artifact.versioning.ArtifactVersion;
import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
import org.apache.maven.enforcer.rule.api.EnforcerRuleException;
import org.apache.maven.enforcer.rule.api.EnforcerRuleHelper;
import org.apache.maven.plugin.logging.Log;
import org.codehaus.plexus.util.StringUtils;

/**
 * This rule checks that the Java version is allowed.
 *
 * @author <a href="mailto:brianf@apache.org">Brian Fox</a>
 * @version $Id$
 */
public class RequireJavaVersion extends AbstractVersionEnforcer {

    /*
     * (non-Javadoc)
     *
     * @see org.apache.maven.enforcer.rule.api.EnforcerRule#execute(org.apache.maven.enforcer.rule.api.EnforcerRuleHelper)
     */
    public void execute(EnforcerRuleHelper helper) throws EnforcerRuleException {
        String java_version = SystemUtils.JAVA_VERSION_TRIMMED;
        Log log = helper.getLog();

        log.debug("Detected Java String: " + java_version);
        java_version = normalizeJDKVersion(java_version);
        log.debug("Normalized Java String: " + java_version);

        ArtifactVersion detectedJdkVersion = new DefaultArtifactVersion(java_version);

        log.debug("Parsed Version: Major: " + detectedJdkVersion.getMajorVersion() + " Minor: "
                + detectedJdkVersion.getMinorVersion() + " Incremental: "
                + detectedJdkVersion.getIncrementalVersion() + " Build: " + detectedJdkVersion.getBuildNumber()
                + " Qualifier: " + detectedJdkVersion.getQualifier());

        enforceVersion(helper.getLog(), "JDK", version, detectedJdkVersion);
    }

    /**
     * Converts a jdk string from 1.5.0-11b12 to a single 3 digit version like 1.5.0-11
     *
     * @param theJdkVersion to be converted.
     * @return the converted string.
     */
    public static String normalizeJDKVersion(String theJdkVersion) {

        theJdkVersion = theJdkVersion.replaceAll("_|-", ".");
        String tokenArray[] = StringUtils.split(theJdkVersion, ".");
        List<String> tokens = Arrays.asList(tokenArray);
        StringBuffer buffer = new StringBuffer(theJdkVersion.length());

        Iterator<String> iter = tokens.iterator();
        for (int i = 0; i < tokens.size() && i < 4; i++) {
            String section = (String) iter.next();
            section = section.replaceAll("[^0-9]", "");

            if (StringUtils.isNotEmpty(section)) {
                buffer.append(Integer.parseInt(section));

                if (i != 2) {
                    buffer.append('.');
                } else {
                    buffer.append('-');
                }
            }
        }

        String version = buffer.toString();
        version = StringUtils.stripEnd(version, "-");
        return StringUtils.stripEnd(version, ".");
    }
}