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: RequireJavaVersion.java 1345283 2012-06-01 17:34:35Z rfscholte $

  */

 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, "." );

     }

 }