/*
    * 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.myfaces.tobago.util;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.el.ValueExpression;
  import javax.faces.context.FacesContext;
  import java.util.Comparator;
  import java.util.Map;
  
  public class ValueExpressionComparator extends ComparatorBase {
  
    private static final Logger LOG = LoggerFactory.getLogger(ValueExpressionComparator.class);
  
    private FacesContext facesContext;
  
    private String var;
  
    private ValueExpression valueExpression;
  
    public ValueExpressionComparator(FacesContext facesContext, String var, ValueExpression valueExpression) {
      this.facesContext = facesContext;
      this.var = var;
      this.valueExpression = valueExpression;
    }
  
    public ValueExpressionComparator(FacesContext facesContext, String var, ValueExpression valueExpression,
        boolean reverse) {
      super(reverse);
      this.facesContext = facesContext;
      this.var = var;
      this.valueExpression = valueExpression;
    }
  
    public ValueExpressionComparator(FacesContext facesContext, String var,
        ValueExpression valueExpression, Comparator comparator) {
      super(comparator);
      this.facesContext = facesContext;
      this.var = var;
      this.valueExpression = valueExpression;
    }
  
    public ValueExpressionComparator(FacesContext facesContext, String var,
        ValueExpression valueExpression, boolean reverse, Comparator comparator) {
      super(reverse, comparator);
      this.facesContext = facesContext;
      this.var = var;
      this.valueExpression = valueExpression;
    }
  
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
  
      final ValueExpressionComparator that = (ValueExpressionComparator) o;
  
      if (!super.equals(o)) {
        return false;
      }
      if (facesContext != null ? !facesContext.equals(that.facesContext) : that.facesContext != null) {
        return false;
      }
      if (valueExpression != null ? !valueExpression.equals(that.valueExpression) : that.valueExpression != null) {
        return false;
      }
      if (var != null ? !var.equals(that.var) : that.var != null) {
        return false;
      }
  
      return true;
    }
  
    public int hashCode() {
      int result;
      result = (facesContext != null ? facesContext.hashCode() : 0);
      result = 29 * result + (var != null ? var.hashCode() : 0);
     result = 29 * result + (valueExpression != null ? valueExpression.hashCode() : 0);
     result = 29 * result + super.hashCode();
     return result;
   }
 
   // implementation of java.util.Comparator interface
 
   /**
    * @param param1 <description>
    * @param param2 <description>
    * @return <description>
    */
   public int compare(Object param1, Object param2) {
     Object obj1;
     Object obj2;
     try {
       final Map requestMap = facesContext.getExternalContext().getRequestMap();
       requestMap.put(var, param1);
       obj1 = valueExpression.getValue(facesContext.getELContext());
       requestMap.put(var, param2);
       obj2 = valueExpression.getValue(facesContext.getELContext());
 
     } catch (Exception e) {
       LOG.error(e.getMessage(), e);
       return 0;
     }
     return super.internalCompare(obj1, obj2);
   }
 }