package org.codehaus.plexus.components.io.resources;
   
   /*
    * Copyright 2007 The Codehaus Foundation.
    *
    * Licensed 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 javax.annotation.Nonnull;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Iterator;
  
  import org.codehaus.plexus.components.io.filemappers.FileMapper;
  import org.codehaus.plexus.components.io.filemappers.PrefixFileMapper;
  import org.codehaus.plexus.components.io.fileselectors.FileSelector;
  import org.codehaus.plexus.components.io.functions.InputStreamTransformer;
  
  /**
   * Default implementation of a resource collection.
   */
  public abstract class AbstractPlexusIoResourceCollection implements PlexusIoResourceCollection {
  
      static class IdentityTransformer implements InputStreamTransformer {
          @Nonnull
          public InputStream transform(@Nonnull PlexusIoResource resource, @Nonnull InputStream inputStream)
                  throws IOException {
              return inputStream;
          }
      }
  
      public static final InputStreamTransformer identityTransformer = new IdentityTransformer();
  
      private String prefix;
  
      private String[] includes;
  
      private String[] excludes;
  
      private FileSelector[] fileSelectors;
  
      private boolean caseSensitive = true;
  
      private boolean usingDefaultExcludes = true;
  
      private boolean includingEmptyDirectories = true;
  
      private FileMapper[] fileMappers;
  
      private InputStreamTransformer streamTransformer = identityTransformer;
  
      protected AbstractPlexusIoResourceCollection() {}
  
      /**
       * Sets a string of patterns, which excluded files
       * should match.
       */
      public void setExcludes(String[] excludes) {
          this.excludes = excludes;
      }
  
      /**
       * Returns a string of patterns, which excluded files
       * should match.
       */
      public String[] getExcludes() {
          return excludes;
      }
  
      /**
       * Sets a set of file selectors, which should be used
       * to select the included files.
       */
      public void setFileSelectors(FileSelector[] fileSelectors) {
          this.fileSelectors = fileSelectors;
      }
  
      /**
       * Returns a set of file selectors, which should be used
       * to select the included files.
       */
      public FileSelector[] getFileSelectors() {
          return fileSelectors;
      }
  
      public void setStreamTransformer(InputStreamTransformer streamTransformer) {
          if (streamTransformer == null) {
              this.streamTransformer = identityTransformer;
         } else {
             this.streamTransformer = streamTransformer;
         }
     }
 
     protected InputStreamTransformer getStreamTransformer() {
         return streamTransformer;
     }
 
     /**
      * Sets a string of patterns, which included files
      * should match.
      */
     public void setIncludes(String[] includes) {
         this.includes = includes;
     }
 
     /**
      * Returns a string of patterns, which included files
      * should match.
      */
     public String[] getIncludes() {
         return includes;
     }
 
     /**
      * Sets the prefix, which the file sets contents shall
      * have.
      */
     public void setPrefix(String prefix) {
         this.prefix = prefix;
     }
 
     /**
      * Returns the prefix, which the file sets contents shall
      * have.
      */
     public String getPrefix() {
         return prefix;
     }
 
     /**
      * Sets, whether the include/exclude patterns are
      * case sensitive. Defaults to true.
      */
     public void setCaseSensitive(boolean caseSensitive) {
         this.caseSensitive = caseSensitive;
     }
 
     /**
      * Returns, whether the include/exclude patterns are
      * case sensitive. Defaults to true.
      */
     public boolean isCaseSensitive() {
         return caseSensitive;
     }
 
     /**
      * Sets, whether the default excludes are being
      * applied. Defaults to true.
      */
     public void setUsingDefaultExcludes(boolean usingDefaultExcludes) {
         this.usingDefaultExcludes = usingDefaultExcludes;
     }
 
     /**
      * Returns, whether the default excludes are being
      * applied. Defaults to true.
      */
     public boolean isUsingDefaultExcludes() {
         return usingDefaultExcludes;
     }
 
     /**
      * Sets, whether empty directories are being included. Defaults
      * to true.
      */
     public void setIncludingEmptyDirectories(boolean includingEmptyDirectories) {
         this.includingEmptyDirectories = includingEmptyDirectories;
     }
 
     /**
      * Returns, whether empty directories are being included. Defaults
      * to true.
      */
     public boolean isIncludingEmptyDirectories() {
         return includingEmptyDirectories;
     }
 
     protected boolean isSelected(PlexusIoResource plexusIoResource) throws IOException {
         FileSelector[] fileSelectors = getFileSelectors();
         if (fileSelectors != null) {
             for (FileSelector fileSelector : fileSelectors) {
                 if (!fileSelector.isSelected(plexusIoResource)) {
                     return false;
                 }
             }
         }
         return true;
     }
 
     /**
      * Returns the file name mappers, which are used to transform
      * the resource names.
      */
     public FileMapper[] getFileMappers() {
         return fileMappers;
     }
 
     /**
      * Sets the file name mappers, which are used to transform
      * the resource names.
      */
     public void setFileMappers(FileMapper[] fileMappers) {
         this.fileMappers = fileMappers;
     }
 
     public Iterator<PlexusIoResource> iterator() {
         try {
             return getResources();
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
     }
 
     public String getName(PlexusIoResource resource) {
         return getName(resource.getName());
     }
 
     protected String getName(String resourceName) {
         String name = resourceName;
         final FileMapper[] mappers = getFileMappers();
         if (mappers != null) {
             for (FileMapper mapper : mappers) {
                 name = mapper.getMappedFileName(name);
             }
         }
         return PrefixFileMapper.getMappedFileName(getPrefix(), name);
     }
 
     public InputStream getInputStream(PlexusIoResource resource) throws IOException {
         InputStream contents = resource.getContents();
         return new ClosingInputStream(streamTransformer.transform(resource, contents), contents);
     }
 
     public PlexusIoResource resolve(final PlexusIoResource resource) throws IOException {
         final Deferred deferred = new Deferred(resource, this, streamTransformer != identityTransformer);
         return deferred.asResource();
     }
 
     public long getLastModified() throws IOException {
         long lastModified = PlexusIoResource.UNKNOWN_MODIFICATION_DATE;
         for (Iterator<PlexusIoResource> iter = getResources(); iter.hasNext(); ) {
             long l = iter.next().getLastModified();
             if (l == PlexusIoResource.UNKNOWN_MODIFICATION_DATE) {
                 return PlexusIoResource.UNKNOWN_MODIFICATION_DATE;
             }
             if (lastModified == PlexusIoResource.UNKNOWN_MODIFICATION_DATE || l > lastModified) {
                 lastModified = l;
             }
         }
         return lastModified;
     }
 }