/*
    *  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.
   */
  package org.codehaus.groovy.control.customizers;
  
  import groovy.lang.Closure;
  import org.codehaus.groovy.ast.ClassNode;
  import org.codehaus.groovy.classgen.GeneratorContext;
  import org.codehaus.groovy.control.CompilationFailedException;
  import org.codehaus.groovy.control.SourceUnit;
  import org.codehaus.groovy.control.io.FileReaderSource;
  import org.codehaus.groovy.control.io.ReaderSource;
  
  /**
   * A base class for customizers which only have to be applied on specific source units.
   * This is for example useful if you want a customizer to be applied only for files
   * matching some extensions.
   * <p>
   * For convenience, this class implements several methods that you may extend to customize
   * the behaviour of this utility. For example, if you want to apply a customizer only
   * for classes matching the '.foo' file extension, then you only have to override the
   * {@link #acceptExtension(String)} method:
   * <pre><code>return "foo".equals(extension)</code></pre>
   *
   * @since 2.1.0
   * @author Cedric Champeau
   */
  public class SourceAwareCustomizer extends DelegatingCustomizer {
  
      private Closure<Boolean> extensionValidator;
      private Closure<Boolean> baseNameValidator;
      private Closure<Boolean> sourceUnitValidator;
      private Closure<Boolean> classValidator;
  
      public SourceAwareCustomizer(CompilationCustomizer delegate) {
          super(delegate);
      }
  
      @Override
      public void call(final SourceUnit source, final GeneratorContext context, final ClassNode classNode) throws CompilationFailedException {
          String fileName = source.getName();
          ReaderSource reader = source.getSource();
          if (reader instanceof FileReaderSource) {
              FileReaderSource file = (FileReaderSource) reader;
              fileName = file.getFile().getName();
          }
          if (acceptSource(source) && acceptClass(classNode) && accept(fileName)) {
              delegate.call(source, context, classNode);
          }
      }
  
      public void setBaseNameValidator(final Closure<Boolean> baseNameValidator) {
          this.baseNameValidator = baseNameValidator;
      }
  
      public void setExtensionValidator(final Closure<Boolean> extensionValidator) {
          this.extensionValidator = extensionValidator;
      }
  
      public void setSourceUnitValidator(final Closure<Boolean> sourceUnitValidator) {
          this.sourceUnitValidator = sourceUnitValidator;
      }
  
      public void setClassValidator(final Closure<Boolean> classValidator) {
          this.classValidator = classValidator;
      }
  
      public boolean accept(String fileName) {
          int ext = fileName.lastIndexOf(".");
          String baseName = ext<0?fileName:fileName.substring(0, ext);
          String extension = ext<0?"":fileName.substring(ext+1);
          return acceptExtension(extension) && acceptBaseName(baseName);
      }
  
      public boolean acceptClass(ClassNode cnode) {
          return classValidator == null || classValidator.call(cnode);
      }
  
      public boolean acceptSource(SourceUnit unit) {
          return sourceUnitValidator==null || sourceUnitValidator.call(unit);
      }
  
      public boolean acceptExtension(String extension) {
          return extensionValidator==null || extensionValidator.call(extension);
     }
 
     public boolean acceptBaseName(String baseName) {
         return baseNameValidator==null || baseNameValidator.call(baseName);
     }
 }