package org.codehaus.plexus.compiler.manager;
   
   /**
    * The MIT License
    *
    * Copyright (c) 2005, The Codehaus
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy of
    * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   * of the Software, and to permit persons to whom the Software is furnished to do
   * so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Provider;
  
  import java.util.Map;
  
  import org.codehaus.plexus.compiler.Compiler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
   */
  @Named
  public class DefaultCompilerManager implements CompilerManager {
      private static final String ERROR_MESSAGE = "Compiler '{}' could not be instantiated or injected properly. "
              + "If you spelled the compiler ID correctly and all necessary dependencies are on the classpath, "
              + "then next you can try running the build with -Dsisu.debug, looking for exceptions.";
      private static final String ERROR_MESSAGE_DETAIL = "TypeNotPresentException caused by UnsupportedClassVersionError "
              + "might indicate, that the compiler needs a more recent Java runtime. "
              + "IllegalArgumentException in ClassReader.<init> might mean, that you need to upgrade Maven.";
  
      @Inject
      private Map<String, Provider<Compiler>> compilers;
  
      private final Logger log = LoggerFactory.getLogger(getClass());
  
      // ----------------------------------------------------------------------
      // CompilerManager Implementation
      // ----------------------------------------------------------------------
  
      public Compiler getCompiler(String compilerId) throws NoSuchCompilerException {
          // Provider<Class> is lazy -> presence of provider means compiler is present, but not yet constructed
          Provider<Compiler> compilerProvider = compilers.get(compilerId);
  
          if (compilerProvider == null) {
              // Compiler could not be injected for some reason
              log.error(ERROR_MESSAGE + " " + ERROR_MESSAGE_DETAIL, compilerId);
              throw new NoSuchCompilerException(compilerId);
          }
  
          // Provider exists, but compiler was not created yet
          try {
              return compilerProvider.get();
          } catch (Exception e) {
              // DI could not construct compiler
              log.error(ERROR_MESSAGE, compilerId);
              throw new NoSuchCompilerException(compilerId, e);
          }
      }
  }