package org.apache.maven.toolchain;
   
   /*
    * 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.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Objects;
  
  import org.apache.maven.toolchain.model.ToolchainModel;
  import org.slf4j.Logger;
  
  /**
   * Default abstract toolchain implementation, to be used as base class for any toolchain implementation
   * to avoid rewriting usual code.
   *
   * @author mkleint
   * @since 2.0.9
   */
  public abstract class DefaultToolchain // should have been AbstractToolchain...
      implements Toolchain, ToolchainPrivate
  {
      private final Logger logger;
  
      private String type;
  
      private Map<String, RequirementMatcher> provides = new HashMap<>();
  
      public static final String KEY_TYPE = "type"; //NOI18N
  
      private ToolchainModel model;
  
      /**
       *
       * @param model the model, must not be {@code null}
       * @param logger the logger, must not be {@code null}
       */
      protected DefaultToolchain( ToolchainModel model, Logger logger )
      {
          this.model = model;
          this.logger = logger;
      }
  
      /**
       *
       * @param model the model, must not be {@code null}
       * @param type the type
       * @param logger the logger, must not be {@code null}
       */
      protected DefaultToolchain( ToolchainModel model, String type, Logger logger )
      {
          this( model, logger );
          this.type = type;
      }
  
      @Override
      public final String getType()
      {
          return type != null ? type : model.getType();
      }
  
      @Override
      public final ToolchainModel getModel()
      {
          return model;
      }
  
      public final void addProvideToken( String type, RequirementMatcher matcher )
      {
          provides.put( type, matcher );
      }
  
      @Override
      public boolean matchesRequirements( Map<String, String> requirements )
      {
          for ( Map.Entry<String, String> requirement : requirements.entrySet() )
          {
              String key = requirement.getKey();
  
              RequirementMatcher matcher = provides.get( key );
  
             if ( matcher == null )
             {
                 getLog().debug( "Toolchain " + this + " is missing required property: " + key );
                 return false;
             }
             if ( !matcher.matches( requirement.getValue() ) )
             {
                 getLog().debug( "Toolchain " + this + " doesn't match required property: " + key );
                 return false;
             }
         }
         return true;
     }
 
     protected Logger getLog()
     {
         return logger;
     }
 
     @Override
     public boolean equals( Object obj )
     {
         if ( obj == null )
         {
             return false;
         }
 
         if ( this == obj )
         {
             return true;
         }
 
         if ( !( obj instanceof DefaultToolchain ) )
         {
             return false;
         }
 
         DefaultToolchain other = (DefaultToolchain) obj;
 
         if ( !Objects.equals( type, other.type ) )
         {
             return false;
         }
 
         Properties thisProvides = this.getModel().getProvides();
         Properties otherProvides = other.getModel().getProvides();
 
         return Objects.equals( thisProvides, otherProvides );
     }
 
     @Override
     public int hashCode()
     {
         int hashCode = ( type == null ) ? 0 : type.hashCode();
 
         if ( this.getModel().getProvides() != null )
         {
             hashCode = 31 * hashCode + this.getModel().getProvides().hashCode();
         }
         return hashCode;
     }
 
     @Override
     public String toString()
     {
         StringBuilder builder = new StringBuilder();
         builder.append( "type:" ).append( getType() );
         builder.append( '{' );
 
         Iterator<Map.Entry<String, RequirementMatcher>> providesIter = provides.entrySet().iterator();
         while ( providesIter.hasNext() )
         {
             Map.Entry<String, RequirementMatcher> provideEntry = providesIter.next();
             builder.append( provideEntry.getKey() ).append( " = " ).append( provideEntry.getValue() );
             if ( providesIter.hasNext() )
             {
                 builder.append( ';' );
             }
         }
 
         builder.append( '}' );
 
         return builder.toString();
     }
 }