package org.apache.maven.plugins.shade.resource.properties;
   
   /*
    * 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.
   */
  
  import java.io.BufferedWriter;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStreamWriter;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  import java.util.Properties;
  import java.util.jar.JarEntry;
  import java.util.jar.JarOutputStream;
  
  import org.apache.maven.plugins.shade.relocation.Relocator;
  import org.apache.maven.plugins.shade.resource.ResourceTransformer;
  import org.apache.maven.plugins.shade.resource.properties.io.NoCloseOutputStream;
  import org.apache.maven.plugins.shade.resource.properties.io.SkipPropertiesDateLineWriter;
  
  /**
   * Enables to merge a set of properties respecting priority between them.
   *
   * @since 3.2.2
   */
  public class PropertiesTransformer implements ResourceTransformer
  {
      private String resource;
      private String alreadyMergedKey;
      private String ordinalKey;
      private int defaultOrdinal;
      private boolean reverseOrder;
  
      private final List<Properties> properties = new ArrayList<>();
  
      public PropertiesTransformer()
      {
          // no-op
      }
  
      protected PropertiesTransformer( final String resource, final String ordinalKey,
                                       final int defaultOrdinal, final boolean reversed )
      {
          this.resource = resource;
          this.ordinalKey = ordinalKey;
          this.defaultOrdinal = defaultOrdinal;
          this.reverseOrder = reversed;
      }
  
      @Override
      public boolean canTransformResource( final String resource )
      {
          return Objects.equals( resource, this.resource );
      }
  
      @Override
      public void processResource( final String resource, final InputStream is, final List<Relocator> relocators )
              throws IOException
      {
          final Properties p = new Properties();
          p.load( is );
          properties.add( p );
      }
  
      @Override
      public boolean hasTransformedResource()
      {
          return !properties.isEmpty();
      }
  
      @Override
      public void modifyOutputStream( final JarOutputStream os ) throws IOException
      {
          if ( properties.isEmpty() )
          {
              return;
          }
  
          final Properties out = mergeProperties( sortProperties() );
          if ( ordinalKey != null )
          {
             out.remove( ordinalKey );
         }
         if ( alreadyMergedKey != null )
         {
             out.remove( alreadyMergedKey );
         }
         os.putNextEntry( new JarEntry( resource ) );
         final BufferedWriter writer = new SkipPropertiesDateLineWriter(
                 new OutputStreamWriter( new NoCloseOutputStream( os ), StandardCharsets.ISO_8859_1 ) );
         out.store( writer, " Merged by maven-shade-plugin (" + getClass().getName() + ")" );
         writer.close();
         os.closeEntry();
     }
 
     public void setReverseOrder( final boolean reverseOrder )
     {
         this.reverseOrder = reverseOrder;
     }
 
     public void setResource( final String resource )
     {
         this.resource = resource;
     }
 
     public void setOrdinalKey( final String ordinalKey )
     {
         this.ordinalKey = ordinalKey;
     }
 
     public void setDefaultOrdinal( final int defaultOrdinal )
     {
         this.defaultOrdinal = defaultOrdinal;
     }
 
     public void setAlreadyMergedKey( final String alreadyMergedKey )
     {
         this.alreadyMergedKey = alreadyMergedKey;
     }
 
     private List<Properties> sortProperties()
     {
         final List<Properties> sortedProperties = new ArrayList<>();
         boolean foundMaster = false;
         for ( final Properties current : properties )
         {
             if ( alreadyMergedKey != null )
             {
                 final String master = current.getProperty( alreadyMergedKey );
                 if ( Boolean.parseBoolean( master ) )
                 {
                     if ( foundMaster )
                     {
                         throw new IllegalStateException(
                                 "Ambiguous merged values: " + sortedProperties + ", " + current );
                     }
                     foundMaster = true;
                     sortedProperties.clear();
                     sortedProperties.add( current );
                 }
             }
             if ( !foundMaster )
             {
                 final int configOrder = getConfigurationOrdinal( current );
 
                 int i;
                 for ( i = 0; i < sortedProperties.size(); i++ )
                 {
                     int listConfigOrder = getConfigurationOrdinal( sortedProperties.get( i ) );
                     if ( ( !reverseOrder && listConfigOrder > configOrder )
                             || ( reverseOrder && listConfigOrder < configOrder ) )
                     {
                         break;
                     }
                 }
                 sortedProperties.add( i, current );
             }
         }
         return sortedProperties;
     }
 
     private int getConfigurationOrdinal( final Properties p )
     {
         if ( ordinalKey == null )
         {
             return defaultOrdinal;
         }
         final String configOrderString = p.getProperty( ordinalKey );
         if ( configOrderString != null && configOrderString.length() > 0 )
         {
             return Integer.parseInt( configOrderString );
         }
         return defaultOrdinal;
     }
 
     private static Properties mergeProperties( final List<Properties> sortedProperties )
     {
         final Properties mergedProperties = new SortedProperties();
         for ( final Properties p : sortedProperties )
         {
             mergedProperties.putAll( p );
         }
         return mergedProperties;
     }
 }