/*

  * Copyright 2005-2007 The Kuali Foundation

  *

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.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.kew.rule.bo;

 import org.hibernate.annotations.GenericGenerator;

 import org.hibernate.annotations.Parameter;

 import org.kuali.rice.core.api.reflect.ObjectDefinition;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

 import org.kuali.rice.core.api.reflect.ObjectDefinition;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

 import org.kuali.rice.kew.exception.WorkflowRuntimeException;

 import org.kuali.rice.kew.rule.RuleExtension;

 import org.kuali.rice.kew.rule.RuleValidationAttribute;

 import org.kuali.rice.kew.rule.WorkflowAttribute;

 import org.kuali.rice.kew.rule.service.RuleAttributeService;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.kuali.rice.kew.util.KEWConstants;

 import org.kuali.rice.kns.bo.Inactivateable;

 import org.kuali.rice.kns.bo.PersistableBusinessObjectBase;

 import javax.persistence.*;

 import java.util.List;

 /**

  * A model bean which services as the link between a {@link RuleTemplate} and

  * a {@link RuleAttribute}.

  *

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

  */

 @Entity

 @Table(name="KREW_RULE_TMPL_ATTR_T")

 //@Sequence(name="KREW_RTE_TMPL_S", property="ruleTemplateAttributeId")

 public class RuleTemplateAttribute extends PersistableBusinessObjectBase implements Comparable<RuleTemplateAttribute>, Inactivateable {

     private static final long serialVersionUID = -3580049225424553828L;

     @Id

     @GeneratedValue(generator="KREW_RTE_TMPL_S")

         @GenericGenerator(name="KREW_RTE_TMPL_S",strategy="org.hibernate.id.enhanced.SequenceStyleGenerator",parameters={

                         @Parameter(name="sequence_name",value="KREW_RTE_TMPL_S"),

                         @Parameter(name="value_column",value="id")

         })

         @Column(name="RULE_TMPL_ATTR_ID")

         private Long ruleTemplateAttributeId;

     @Column(name="RULE_TMPL_ID", insertable=false, updatable=false)

         private Long ruleTemplateId;

     @Column(name="RULE_ATTR_ID", insertable=false, updatable=false)

         private Long ruleAttributeId;

     @Column(name="REQ_IND")

         private Boolean required;

     @Column(name="ACTV_IND")

         private Boolean active;

     @Column(name="DSPL_ORD")

         private Integer displayOrder;

     @Column(name="DFLT_VAL")

         private String defaultValue;

     @ManyToOne(fetch=FetchType.EAGER)

         @JoinColumn(name="RULE_TMPL_ID")

         private RuleTemplate ruleTemplate;

     @ManyToOne(fetch=FetchType.EAGER)

         @JoinColumn(name="RULE_ATTR_ID")

         private RuleAttribute ruleAttribute;

     @OneToMany(fetch=FetchType.LAZY,mappedBy="ruleTemplateAttribute")

         private List<RuleExtension> ruleExtensions;

     public RuleTemplateAttribute() {

         this.required = Boolean.FALSE;

         this.active = Boolean.TRUE;

     }

     public int compareTo(RuleTemplateAttribute ruleTemplateAttribute) {

             if ((this.getDisplayOrder() != null) && (ruleTemplateAttribute.getDisplayOrder() != null)) {

                     return this.getDisplayOrder().compareTo(ruleTemplateAttribute.getDisplayOrder());

             }

             return 0;

     }

     public Object getAttribute() {

         try {

             ObjectDefinition objectDefinition = new ObjectDefinition(getRuleAttribute().getClassName(), getRuleAttribute().getServiceNamespace());

             Object attribute = GlobalResourceLoader.getObject(objectDefinition);

             if (attribute == null) {

                 throw new WorkflowRuntimeException("Could not find attribute " + objectDefinition);

             }

             if (attribute instanceof WorkflowAttribute) {

                 ((WorkflowAttribute) attribute).setRequired(required.booleanValue());

             }

             return attribute;

         } catch (Exception e) {

             throw new RuntimeException("Caught error attempting to load attribute class: " + getRuleAttribute().getClassName(), e);

         }

     }

     public boolean isWorkflowAttribute() {

         try {

             Object attributeObject = getAttribute();//GlobalResourceLoader.getResourceLoader().getObject(new ObjectDefinition(getRuleAttribute().getClassName()));

             if (attributeObject == null) {

                 return false;

             }

             Class<?> attributeClass = attributeObject.getClass();

             return WorkflowAttribute.class.isAssignableFrom(attributeClass);

         } catch (Exception e) {

             throw new RuntimeException("Caught error attempting to load WorkflowAttribute class: " + getRuleAttribute().getClassName(), e);

         }

     }

     public boolean isRuleValidationAttribute() {

         // just check the type here to avoid having to load the class from the class loader if it's not actually there

         return KEWConstants.RULE_VALIDATION_ATTRIBUTE_TYPE.equals(getRuleAttribute().getType());

     }

     /**

      * Instantiates and returns a new instance of the WorkflowAttribute class configured on this template.

      * The calling code should be sure to call isWorkflowAttribute first to verify the type of this attribute

      * is that of a WorkflowAttribute.  Otherwise a RuntimeException will be thrown.

      */

     public WorkflowAttribute getWorkflowAttribute() {

         try {

             ObjectDefinition objectDefinition = new ObjectDefinition(getRuleAttribute().getClassName(), getRuleAttribute().getServiceNamespace());

             WorkflowAttribute workflowAttribute = (WorkflowAttribute) GlobalResourceLoader.getResourceLoader().getObject(objectDefinition);

             if (workflowAttribute == null) {

                 throw new WorkflowRuntimeException("Could not find workflow attribute " + objectDefinition);

             }

             workflowAttribute.setRequired(required.booleanValue());

             return workflowAttribute;

         } catch (Exception e) {

             throw new RuntimeException("Caught exception instantiating new " + getRuleAttribute().getClassName(), e);

         }

     }

     /**

      * Instantiates and returns a new instance of the RuleValidationAttribute class configured on this template.

      * The calling code should be sure to call isRuleValidationAttribute first to verify the type of this attribute

      * is that of a RuleValidationAttribute.  Otherwise a RuntimeException will be thrown.

      */

     public RuleValidationAttribute getRuleValidationAttribute() {

         try {

             return (RuleValidationAttribute) getAttribute();

         } catch (Exception e) {

             throw new RuntimeException("Caught exception instantiating new " + getRuleAttribute().getClassName(), e);

         }

     }

     public List<RuleExtension> getRuleExtensions() {

         return ruleExtensions;

     }

     public void setRuleExtensions(List<RuleExtension> ruleExtensions) {

         this.ruleExtensions = ruleExtensions;

     }

     public RuleAttribute getRuleAttribute() {

         if (ruleAttribute == null && ruleAttributeId != null) {

             ruleAttribute = ((RuleAttributeService) KEWServiceLocator.getService(KEWServiceLocator.RULE_ATTRIBUTE_SERVICE)).findByRuleAttributeId(ruleAttributeId);

         }

         return ruleAttribute;

     }

     public void setRuleAttribute(RuleAttribute ruleAttribute) {

         this.ruleAttribute = ruleAttribute;

     }

     public RuleTemplate getRuleTemplate() {

         return ruleTemplate;

     }

     public void setRuleTemplate(RuleTemplate ruleTemplate) {

         this.ruleTemplate = ruleTemplate;

     }

     public String getDefaultValue() {

         return defaultValue;

     }

     public void setDefaultValue(String defaultValue) {

         this.defaultValue = defaultValue;

     }

     public Integer getDisplayOrder() {

         return displayOrder;

     }

     public void setDisplayOrder(Integer displayOrder) {

         this.displayOrder = displayOrder;

     }

     public boolean isRequired() {

         return (getRequired() == null) || (getRequired().booleanValue());

     }

     public Boolean getRequired() {

         return required;

     }

     public void setRequired(Boolean required) {

         this.required = required;

     }

     public boolean isActive() {

         return (getActive() == null) || (getActive().booleanValue());

     }

     public Boolean getActive() {

         return active;

     }

     public void setActive(Boolean active) {

         this.active = active;

     }

     public void setActive(boolean active) {

             this.active = active;

     }

     public Long getRuleAttributeId() {

         return ruleAttributeId;

     }

     public void setRuleAttributeId(Long ruleAttributeId) {

         this.ruleAttributeId = ruleAttributeId;

     }

     public Long getRuleTemplateAttributeId() {

         return ruleTemplateAttributeId;

     }

     public void setRuleTemplateAttributeId(Long ruleTemplateAttributeId) {

         this.ruleTemplateAttributeId = ruleTemplateAttributeId;

     }

     public Long getRuleTemplateId() {

         return ruleTemplateId;

     }

     public void setRuleTemplateId(Long ruleTemplateId) {

         this.ruleTemplateId = ruleTemplateId;

     }

 }