net.sf.ezmorph.object.MapToDateMorpher Maven / Gradle / Ivy

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Simple java library for transforming an Object to another Object.
There is a newer version: 1.0.6
/*
 * Copyright 2006-2007 the original author or authors.
 *
 * Licensed 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 net.sf.ezmorph.object;

import java.util.Calendar;
import java.util.Date;
import java.util.Map;

import net.sf.ezmorph.MorphException;

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;

/**
 * Morphs a Map into a Date.

 * The Map should have at least one of the following keys
 * [yer,month,day,hour,minutes,seconds,milliseconds] and the values should be
 * instances of Number. Any key that is not defined will have zero (0) assigned
 * as its value.
 *
 * @author Andres Almiray 
 */
public class MapToDateMorpher extends AbstractObjectMorpher
{
   private Date defaultValue;

   public MapToDateMorpher()
   {
      super();
   }

   public MapToDateMorpher( Date defaultValue )
   {
      super( true );
      this.defaultValue = defaultValue;
   }

   public boolean equals( Object obj )
   {
      if( this == obj ){
         return true;
      }
      if( obj == null ){
         return false;
      }

      if( !(obj instanceof MapToDateMorpher) ){
         return false;
      }

      MapToDateMorpher other = (MapToDateMorpher) obj;
      EqualsBuilder builder = new EqualsBuilder();
      if( isUseDefault() && other.isUseDefault() ){
         builder.append( getDefaultValue(), other.getDefaultValue() );
         return builder.isEquals();
      }else if( !isUseDefault() && !other.isUseDefault() ){
         return builder.isEquals();
      }else{
         return false;
      }
   }

   /**
    * Returns the default value for this Morpher.
    */
   public Date getDefaultValue()
   {
      return (Date) defaultValue.clone();
   }

   public int hashCode()
   {
      HashCodeBuilder builder = new HashCodeBuilder();
      if( isUseDefault() ){
         builder.append( getDefaultValue() );
      }
      return builder.toHashCode();
   }

   public Object morph( Object value )
   {
      if( value == null ){
         return null;
      }

      if( Date.class.isAssignableFrom( value.getClass() ) ){
         return (Date) value;
      }

      if( !supports( value.getClass() ) ){
         throw new MorphException( value.getClass() + " is not supported" );
      }

      Map map = (Map) value;
      if( map.isEmpty() ){
         if( isUseDefault() ){
            return defaultValue;
         }else{
            throw new MorphException( "Unable to parse the date " + value );
         }
      }

      Calendar c = Calendar.getInstance();
      c.set( Calendar.YEAR, getValue( map, "year" ) );
      c.set( Calendar.MONTH, getValue( map, "month" ) );
      c.set( Calendar.DATE, getValue( map, "day" ) );
      c.set( Calendar.HOUR_OF_DAY, getValue( map, "hour" ) );
      c.set( Calendar.MINUTE, getValue( map, "minutes" ) );
      c.set( Calendar.SECOND, getValue( map, "seconds" ) );
      c.set( Calendar.MILLISECOND, getValue( map, "milliseconds" ) );
      return c.getTime();
   }

   public Class morphsTo()
   {
      return Date.class;
   }

   /**
    * Sets the defaultValue to use if the value to be morphed is null.
    *
    * @param defaultValue return value if the value to be morphed is null
    */
   public void setDefaultValue( Date defaultValue )
   {
      this.defaultValue = (Date) defaultValue.clone();
   }

   public boolean supports( Class clazz )
   {
      return clazz != null && Map.class.isAssignableFrom( clazz );
   }

   private int getValue( Map map, String key )
   {
      Object value = map.get( key );
      if( value == null || !(value instanceof Number) ){
         return 0;
      }

      Number n = (Number) value;
      return n.intValue();
   }
}