/*

  * Copyright 2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php

  *

  * 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.kuali.rice.core.api.criteria;

 import javax.xml.bind.annotation.XmlAccessType;

 import javax.xml.bind.annotation.XmlAccessorType;

 import javax.xml.bind.annotation.XmlAttribute;

 import javax.xml.bind.annotation.XmlElement;

 import javax.xml.bind.annotation.XmlElements;

 import javax.xml.bind.annotation.XmlRootElement;

 import javax.xml.bind.annotation.XmlType;

 /**

  * An immutable expression which represents an "equal" statement which is

  * evaluated the {@link CriteriaValue} of this expression.

  * 

  * <p>Constructed as part of a {@link Criteria} when built using a

  * {@link CriteriaBuilder}.

  * 

  * @see Criteria

  * @see CriteriaBuilder

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  * 

  */

 @XmlRootElement(name = EqualExpression.Constants.ROOT_ELEMENT_NAME)

 @XmlAccessorType(XmlAccessType.NONE)

 @XmlType(name = EqualExpression.Constants.TYPE_NAME)

 public final class EqualExpression extends AbstractExpression implements ValuedExpression {

         private static final long serialVersionUID = 7159459561133496549L;

         @XmlAttribute(name = CriteriaSupportUtils.PropertyConstants.PROPERTY_PATH)

         private final String propertyPath;

         @XmlElements(value = {

                     @XmlElement(name = CriteriaStringValue.Constants.ROOT_ELEMENT_NAME, type = CriteriaStringValue.class, required = true),

                     @XmlElement(name = CriteriaDateTimeValue.Constants.ROOT_ELEMENT_NAME, type = CriteriaDateTimeValue.class, required = true),

                     @XmlElement(name = CriteriaDecimalValue.Constants.ROOT_ELEMENT_NAME, type = CriteriaDecimalValue.class, required = true),

                     @XmlElement(name = CriteriaIntegerValue.Constants.ROOT_ELEMENT_NAME, type = CriteriaIntegerValue.class, required = true)

     })

         private final CriteriaValue<?> value;

     /**

      * Should only be invoked by JAXB.

      */

     @SuppressWarnings("unused")

     private EqualExpression() {

         this.propertyPath = null;

         this.value = null;

     }

     /**

          * Constructs an EqualExpression for the given path and value.  EqualExpression supports the following {@link CriteriaValue}:

          * 

          * <ul>

          *   <li>{@link CriteriaStringValue}</li>

          *   <li>{@link CriteriaDateTimeValue}</li>

          *   <li>{@link CriteriaDecimalValue}</li>

          *   <li>{@link CriteriaIntegerValue}</li>

          * </ul>

          * 

          * @param propertyPath the property path for the expression, must not be null or blank

          * @param value the value to evaluation the path against, must not be null.

          * 

          * @throws IllegalArgumentException if the propertyPath is null or blank

          * @throws IllegalArgumentException if the value is null

          * @throws IllegalArgumentException if this expression does not support the given type of {@link CriteriaValue}

          */

     EqualExpression(String propertyPath, CriteriaValue<?> value) {

             CriteriaSupportUtils.validateValuedExpressionConstruction(getClass(), propertyPath, value);

                 this.propertyPath = propertyPath;

                 this.value = value;

     }

     @Override

     public String getPropertyPath() {

             return propertyPath;

     }

         @Override

         public CriteriaValue<?> getValue() {

                 return value;

         }

         /**

      * Defines some internal constants used on this class.

      */

     static class Constants {

         final static String ROOT_ELEMENT_NAME = "equal";

         final static String TYPE_NAME = "EqualType";

     }

 }