/*
    * 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.apache.maven.plugins.shade.resource;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.List;
  import java.util.jar.JarOutputStream;
  
  import org.apache.maven.plugins.shade.relocation.Relocator;
  
  /**
   * Prevents duplicate copies of the license
   */
  public class ApacheLicenseResourceTransformer extends AbstractCompatibilityTransformer {
      private static final String LICENSE_PATH = "META-INF/LICENSE";
  
      private static final String LICENSE_TXT_PATH = "META-INF/LICENSE.txt";
  
      private static final String LICENSE_MD_PATH = "META-INF/LICENSE.md";
  
      @Override
      public boolean canTransformResource(String resource) {
          return LICENSE_PATH.equalsIgnoreCase(resource)
                  || LICENSE_TXT_PATH.regionMatches(true, 0, resource, 0, LICENSE_TXT_PATH.length())
                  || LICENSE_MD_PATH.regionMatches(true, 0, resource, 0, LICENSE_MD_PATH.length());
      }
  
      @Override
      public void processResource(String resource, InputStream is, List<Relocator> relocators, long time)
              throws IOException {
          // no op
      }
  
      @Override
      public boolean hasTransformedResource() {
          return false;
      }
  
      @Override
      public void modifyOutputStream(JarOutputStream os) throws IOException {
          // no op
      }
  }