/*
    * 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.toolchain;
  
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Properties;
  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();
     }
 }