/*
    * 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 javax.faces.validator;
  
  import javax.faces.component.PartialStateHolder;
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspProperty;
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFProperty;
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFValidator;
  
  /**
   * Creates a validator and associateds it with the nearest parent
   * UIComponent.  When invoked, the validator ensures that values are
   * valid doubles that lie within the minimum and maximum values specified.
   * 
   * Commonly associated with a h:inputText entity.
   * 
   * Unless otherwise specified, all attributes accept static values or EL expressions.
   * 
   * see Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>
   */
  @JSFValidator(
      name="f:validateDoubleRange",
      bodyContent="empty",
      tagClass="org.apache.myfaces.taglib.core.ValidateDoubleRangeTag")
  @JSFJspProperty(
      name="binding", 
      returnType = "javax.faces.validator.DoubleRangeValidator",
      longDesc = "A ValueExpression that evaluates to a DoubleRangeValidator.")
  public class DoubleRangeValidator
          implements Validator, PartialStateHolder
  {
      // FIELDS
      public static final String VALIDATOR_ID       = "javax.faces.DoubleRange";
      public static final String MAXIMUM_MESSAGE_ID = "javax.faces.validator.DoubleRangeValidator.MAXIMUM";
      public static final String MINIMUM_MESSAGE_ID = "javax.faces.validator.DoubleRangeValidator.MINIMUM";
      public static final String TYPE_MESSAGE_ID    = "javax.faces.validator.DoubleRangeValidator.TYPE";
      public static final String NOT_IN_RANGE_MESSAGE_ID = "javax.faces.validator.DoubleRangeValidator.NOT_IN_RANGE";
      
      private Double _minimum = null;
      private Double _maximum = null;
      private boolean _transient = false;
  
      // CONSTRUCTORS
      public DoubleRangeValidator()
      {
      }
  
      public DoubleRangeValidator(double maximum)
      {
          _maximum = new Double(maximum);
      }
  
      public DoubleRangeValidator(double maximum,
                                  double minimum)
      {
          _maximum = new Double(maximum);
          _minimum = new Double(minimum);
      }
  
      // VALIDATE
      public void validate(FacesContext facesContext,
                           UIComponent uiComponent,
                           Object value)
              throws ValidatorException
      {
          if (facesContext == null)
          {
              throw new NullPointerException("facesContext");
          }
          if (uiComponent == null)
          {
              throw new NullPointerException("uiComponent");
          }
  
          if (value == null)
          {
              return;
          }
  
          double dvalue = parseDoubleValue(facesContext, uiComponent,value);
         if (_minimum != null && _maximum != null)
         {
             if (dvalue < _minimum.doubleValue() ||
                 dvalue > _maximum.doubleValue())
             {
                 Object[] args = {_minimum, _maximum,_MessageUtils.getLabel(facesContext, uiComponent)};
                 throw new ValidatorException(_MessageUtils.getErrorMessage(facesContext, NOT_IN_RANGE_MESSAGE_ID,
                                                                            args));
             }
         }
         else if (_minimum != null)
         {
             if (dvalue < _minimum.doubleValue())
             {
                 Object[] args = {_minimum,_MessageUtils.getLabel(facesContext, uiComponent)};
                 throw new ValidatorException(_MessageUtils.getErrorMessage(facesContext, MINIMUM_MESSAGE_ID, args));
             }
         }
         else if (_maximum != null)
         {
             if (dvalue > _maximum.doubleValue())
             {
                 Object[] args = {_maximum,_MessageUtils.getLabel(facesContext, uiComponent)};
                 throw new ValidatorException(_MessageUtils.getErrorMessage(facesContext, MAXIMUM_MESSAGE_ID, args));
             }
         }
     }
 
     private double parseDoubleValue(FacesContext facesContext, UIComponent uiComponent, Object value)
         throws ValidatorException
     {
         if (value instanceof Number)
         {
             return ((Number)value).doubleValue();
         }
         
         try
         {
             return Double.parseDouble(value.toString());
         }
         catch (NumberFormatException e)
         {
             Object[] args = {_MessageUtils.getLabel(facesContext, uiComponent)};
             throw new ValidatorException(_MessageUtils.getErrorMessage(facesContext, TYPE_MESSAGE_ID, args));
         }
     }
 
 
     // GETTER & SETTER
     
     /** 
      * The largest value that should be considered valid.
      * 
      */
     @JSFProperty(deferredValueType="java.lang.Double")
     public double getMaximum()
     {
         return _maximum != null ? _maximum.doubleValue() : Double.MAX_VALUE;
     }
 
     public void setMaximum(double maximum)
     {
         _maximum = new Double(maximum);
         clearInitialState();
     }
 
     /**
      * The smallest value that should be considered valid.
      *  
      */
     @JSFProperty(deferredValueType="java.lang.Double")
     public double getMinimum()
     {
         return _minimum != null ? _minimum.doubleValue() : Double.MIN_VALUE;
     }
 
     public void setMinimum(double minimum)
     {
         _minimum = new Double(minimum);
         clearInitialState();
     }
 
 
     // RESTORE/SAVE STATE
     public Object saveState(FacesContext context)
     {
         if (!initialStateMarked())
         {
             Object values[] = new Object[2];
             values[0] = _maximum;
             values[1] = _minimum;
             return values;
         }
         return null;
     }
 
     public void restoreState(FacesContext context,
                              Object state)
     {
         if (state != null)
         {
             Object values[] = (Object[])state;
             _maximum = (Double)values[0];
             _minimum = (Double)values[1];
         }
     }
 
     public boolean isTransient()
     {
         return _transient;
     }
 
     public void setTransient(boolean transientValue)
     {
         _transient = transientValue;
     }
 
     // MISC
     @Override
     public boolean equals(Object o)
     {
         if (this == o)
         {
             return true;
         }
         if (!(o instanceof DoubleRangeValidator))
         {
             return false;
         }
 
         DoubleRangeValidator doubleRangeValidator = (DoubleRangeValidator)o;
 
         if (_maximum != null ? !_maximum.equals(doubleRangeValidator._maximum) : doubleRangeValidator._maximum != null)
         {
             return false;
         }
         if (_minimum != null ? !_minimum.equals(doubleRangeValidator._minimum) : doubleRangeValidator._minimum != null)
         {
             return false;
         }
 
         return true;
     }
 
 
 
     private boolean _initialStateMarked = false;
 
     public void clearInitialState()
     {
         _initialStateMarked = false;
     }
 
     public boolean initialStateMarked()
     {
         return _initialStateMarked;
     }
 
     public void markInitialState()
     {
         _initialStateMarked = true;
     }
     
     @JSFProperty(faceletsOnly=true)
     @SuppressWarnings("unused")
     private Boolean isDisabled()
     {
         return null;
     }
     
     @JSFProperty(faceletsOnly=true)
     @SuppressWarnings("unused")
     private String getFor()
     {
         return null;
     }
 
     @Override
     public int hashCode()
     {
         int result = _minimum != null ? _minimum.hashCode() : 0;
         result = 31 * result + (_maximum != null ? _maximum.hashCode() : 0);
         return result;
     }
 }