package org.apache.maven.rtinfo.internal;
   
   /*
    * 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 org.apache.commons.lang3.StringUtils;
  import org.apache.commons.lang3.Validate;
  import org.apache.maven.rtinfo.RuntimeInformation;
  import org.eclipse.aether.version.InvalidVersionSpecificationException;
  import org.eclipse.aether.version.Version;
  import org.eclipse.aether.version.VersionConstraint;
  import org.eclipse.aether.version.VersionScheme;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Properties;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  /**
   * Provides information about the current Maven runtime.
   */
  @Named
  @Singleton
  public class DefaultRuntimeInformation
      implements RuntimeInformation
  {
      private final Logger logger = LoggerFactory.getLogger( getClass() );
  
      private final VersionScheme versionScheme;
  
      private final String mavenVersion;
  
      @Inject
      public DefaultRuntimeInformation( final VersionScheme versionScheme )
      {
          this.versionScheme = versionScheme;
          this.mavenVersion = loadMavenVersion();
      }
  
      @Override
      public String getMavenVersion()
      {
          return mavenVersion;
      }
  
      private String loadMavenVersion()
      {
          Properties props = new Properties();
  
          String resource = "META-INF/maven/org.apache.maven/maven-core/pom.properties";
  
          try ( InputStream is = DefaultRuntimeInformation.class.getResourceAsStream( "/" + resource ) )
          {
              if ( is != null )
              {
                  props.load( is );
              }
              else
              {
                  logger.warn(
                      "Could not locate " + resource + " on classpath, Maven runtime information not available" );
              }
          }
          catch ( IOException e )
          {
              String msg = "Could not parse " + resource + ", Maven runtime information not available";
              if ( logger.isDebugEnabled() )
              {
                  logger.warn( msg, e );
              }
              else
              {
                  logger.warn( msg );
              }
          }
  
          String version = props.getProperty( "version", "" ).trim();
  
         if ( !version.startsWith( "${" ) )
         {
             return version;
         }
         else
         {
             return "";
         }
     }
 
     @Override
     public boolean isMavenVersion( String versionRange )
     {
         Validate.notBlank( versionRange, "versionRange can neither be null, empty nor blank" );
 
         VersionConstraint constraint;
         try
         {
             constraint = versionScheme.parseVersionConstraint( versionRange );
         }
         catch ( InvalidVersionSpecificationException e )
         {
             throw new IllegalArgumentException( e.getMessage(), e );
         }
 
         Version current;
         try
         {
             String mavenVersion = getMavenVersion();
             Validate.validState( StringUtils.isNotEmpty( mavenVersion ), "Could not determine current Maven version" );
 
             current = versionScheme.parseVersion( mavenVersion );
         }
         catch ( InvalidVersionSpecificationException e )
         {
             throw new IllegalStateException( "Could not parse current Maven version: " + e.getMessage(), e );
         }
 
         if ( constraint.getRange() == null )
         {
             return constraint.getVersion().compareTo( current ) <= 0;
         }
         return constraint.containsVersion( current );
     }
 
 }