content: /*
   *  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
   *
   *      https://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.
   *
   */
  package org.apache.tools.ant.taskdefs.optional.native2ascii;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.ProjectComponent;
  import org.apache.tools.ant.types.Path;
  import org.apache.tools.ant.util.ClasspathUtils;
  import org.apache.tools.ant.util.JavaEnvUtils;
  
  /**
   * Creates the Native2AsciiAdapter based on the user choice and
   * potentially the VM vendor.
   *
   * @since Ant 1.6.3
   */
  // CheckStyle:HideUtilityClassConstructorCheck OFF (bc)
  public class Native2AsciiAdapterFactory {
  
      /**
       * Determines the default choice of adapter based on the VM
       * vendor.
       *
       * @return the default choice of adapter based on the VM
       * vendor
       */
      public static String getDefault() {
          if (shouldUseKaffe()) {
              return KaffeNative2Ascii.IMPLEMENTATION_NAME;
          }
          return BuiltinNative2Ascii.IMPLEMENTATION_NAME;
      }
  
      /**
       * Creates the Native2AsciiAdapter based on the user choice and
       * potentially the VM vendor.
       *
       * @param choice the user choice (if any).
       * @param log a ProjectComponent instance used to access Ant's
       * logging system.
       * @return The adapter to use.
       * @throws BuildException if there was a problem.
       */
      public static Native2AsciiAdapter getAdapter(String choice,
                                                   ProjectComponent log)
          throws BuildException {
          return getAdapter(choice, log, null);
      }
  
      /**
       * Creates the Native2AsciiAdapter based on the user choice and
       * potentially the VM vendor.
       *
       * @param choice the user choice (if any).
       * @param log a ProjectComponent instance used to access Ant's
       * logging system.
       * @param classpath the classpath to use when looking up an
       * adapter class
       * @return The adapter to use.
       * @throws BuildException if there was a problem.
       * @since Ant 1.8.0
       */
      public static Native2AsciiAdapter getAdapter(String choice,
                                                   ProjectComponent log,
                                                   Path classpath)
          throws BuildException {
          if ((shouldUseKaffe() && choice == null)
              || KaffeNative2Ascii.IMPLEMENTATION_NAME.equals(choice)) {
              return new KaffeNative2Ascii();
          } else if (SunNative2Ascii.IMPLEMENTATION_NAME.equals(choice)) {
              return new SunNative2Ascii();
          } else if (BuiltinNative2Ascii.IMPLEMENTATION_NAME.equals(choice)) {
              return new BuiltinNative2Ascii();
          } else if (choice != null) {
              return resolveClassName(choice,
                                      // Memory leak in line below
                                      log.getProject()
                                      .createClassLoader(classpath));
          }
  
          return new BuiltinNative2Ascii();
      }
  
      /**
       * Tries to resolve the given classname into a native2ascii adapter.
       * Throws a fit if it can't.
       *
       * @param className The fully qualified classname to be created.
       * @param loader the classloader to use
       * @throws BuildException This is the fit that is thrown if className
       * isn't an instance of Native2AsciiAdapter.
       */
      private static Native2AsciiAdapter resolveClassName(String className,
                                                          ClassLoader loader)
          throws BuildException {
          return ClasspathUtils.newInstance(className,
              loader != null ? loader :
              Native2AsciiAdapterFactory.class.getClassLoader(),
              Native2AsciiAdapter.class);
      }
  
      private static final boolean shouldUseKaffe() {
          return JavaEnvUtils.isKaffe() || JavaEnvUtils.isClasspathBased();
      }
  }
  