package org.apache.maven.toolchain;
   
   /*
    * 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.io.File;
  import java.io.Reader;
  
  import org.apache.maven.toolchain.model.PersistedToolchains;
  import org.apache.maven.toolchain.model.io.xpp3.MavenToolchainsXpp3Reader;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  import org.codehaus.plexus.logging.Logger;
  import org.codehaus.plexus.util.IOUtil;
  import org.codehaus.plexus.util.ReaderFactory;
  
  /**
   * @author Benjamin Bentmann
   */
  @Component( role = ToolchainsBuilder.class, hint = "default" )
  public class DefaultToolchainsBuilder
      implements ToolchainsBuilder
  {
  
      @Requirement
      private Logger logger;
  
      public PersistedToolchains build( File userToolchainsFile )
          throws MisconfiguredToolchainException
      {
          PersistedToolchains toolchains = null;
  
          if ( userToolchainsFile != null && userToolchainsFile.isFile() )
          {
              Reader in = null;
              try
              {
                  in = ReaderFactory.newXmlReader( userToolchainsFile );
                  toolchains = new MavenToolchainsXpp3Reader().read( in );
              }
              catch ( Exception e )
              {
                  throw new MisconfiguredToolchainException( "Cannot read toolchains file at "
                      + userToolchainsFile.getAbsolutePath(), e );
              }
              finally
              {
                  IOUtil.close( in );
              }
          }
          else if ( userToolchainsFile != null )
          {
              logger.debug( "Toolchains configuration was not found at " + userToolchainsFile );
          }
  
          return toolchains;
      }
  
  }