package org.kuali.rice.krms.api.repository.rule;

 import java.io.Serializable;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import javax.xml.bind.annotation.XmlAccessType;

 import javax.xml.bind.annotation.XmlAccessorType;

 import javax.xml.bind.annotation.XmlAnyElement;

 import javax.xml.bind.annotation.XmlElement;

 import javax.xml.bind.annotation.XmlElementWrapper;

 import javax.xml.bind.annotation.XmlRootElement;

 import javax.xml.bind.annotation.XmlTransient;

 import javax.xml.bind.annotation.XmlType;

 import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

 import org.apache.commons.lang.StringUtils;

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

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

 import org.apache.commons.lang.builder.ToStringBuilder;

 import org.kuali.rice.core.api.CoreConstants;

 import org.kuali.rice.core.api.mo.ModelBuilder;

 import org.kuali.rice.core.api.mo.ModelObjectComplete;

 import org.kuali.rice.core.util.jaxb.MapStringStringAdapter;

 import org.kuali.rice.krms.api.repository.action.ActionDefinition;

 import org.kuali.rice.krms.api.repository.action.ActionDefinitionContract;

 import org.kuali.rice.krms.api.repository.proposition.PropositionDefinition;

 /**

  * Concrete model object implementation of KRMS Repository Rule 

  * immutable. 

  * Instances of Rule can be (un)marshalled to and from XML.

  *

  * @see RuleDefinitionContract

  */

 @XmlRootElement(name = RuleDefinition.Constants.ROOT_ELEMENT_NAME)

 @XmlAccessorType(XmlAccessType.NONE)

 @XmlType(name = RuleDefinition.Constants.TYPE_NAME, propOrder = {

                 RuleDefinition.Elements.ID,

                 RuleDefinition.Elements.NAME,

                 RuleDefinition.Elements.NAMESPACE,

                 RuleDefinition.Elements.TYPE_ID,

                 RuleDefinition.Elements.PROPOSITION,

                 RuleDefinition.Elements.ACTIONS,

                 RuleDefinition.Elements.ATTRIBUTES,

         CoreConstants.CommonElements.VERSION_NUMBER,

                 CoreConstants.CommonElements.FUTURE_ELEMENTS

 })

 public final class RuleDefinition implements RuleDefinitionContract, ModelObjectComplete{

         private static final long serialVersionUID = 2783959459503209577L;

         @XmlElement(name = Elements.ID, required=true)

         private String id;

         @XmlElement(name = Elements.NAME, required=true)

         private String name;

         @XmlElement(name = Elements.NAMESPACE, required=true)

         private String namespace;

         @XmlElement(name = Elements.TYPE_ID, required=true)

         private String typeId;

         @XmlElement(name = Elements.PROPOSITION, required=true)

         private PropositionDefinition proposition;

         @XmlElementWrapper(name = Elements.ACTIONS)

         @XmlElement(name = Elements.ACTION, required=false)

         private List<ActionDefinition> actions;

         @XmlElement(name = Elements.ATTRIBUTES, required = false)

         @XmlJavaTypeAdapter(value = MapStringStringAdapter.class)

         private final Map<String, String> attributes;

     @XmlElement(name = CoreConstants.CommonElements.VERSION_NUMBER, required = false)

     private final Long versionNumber;

         @SuppressWarnings("unused")

     @XmlAnyElement

     private final Collection<org.w3c.dom.Element> _futureElements = null;

         @XmlTransient

         private String propId;

         /** 

      * This constructor should never be called.  

      * It is only present for use during JAXB unmarshalling. 

      */

     private RuleDefinition() {

             this.id = null;

             this.name = null;

             this.namespace = null;

             this.typeId = null;

             this.propId = null;

             this.proposition = null;

             this.actions = null;

             this.attributes = null;

         this.versionNumber = null;

     }

     /**

          * Constructs a KRMS Repository Rule object from the given builder.  

          * This constructor is private and should only ever be invoked from the builder.

          * 

          * @param builder the Builder from which to construct the Rule

          */

     private RuleDefinition(Builder builder) {

         this.id = builder.getId();

         this.name = builder.getName();

         this.namespace = builder.getNamespace();

         this.typeId = builder.getTypeId();

         this.propId = builder.getPropId();

         if (builder.getProposition() != null) {

             this.proposition = builder.getProposition().build();

         }

         List<ActionDefinition> actionList = new ArrayList<ActionDefinition> ();

         if (builder.getActions() != null){

                 for (ActionDefinition.Builder b : builder.actions){

                         actionList.add(b.build());

                 }

             this.actions = Collections.unmodifiableList(actionList);

         }

         if (builder.attributes != null){

                 this.attributes = Collections.unmodifiableMap(builder.getAttributes());

         } else {

                 this.attributes = null;

         }

         this.versionNumber = builder.getVersionNumber();

     }

         @Override

         public String getId() {

                 return this.id;

         }

         @Override

         public String getName() {

                 return this.name;

         }

         @Override

         public String getNamespace() {

                 return this.namespace;

         }

         @Override

         public String getTypeId() {

                 return this.typeId;

         }

         @Override

         public String getPropId(){

                 return this.propId;

         }

         @Override

         public PropositionDefinition getProposition(){

                 return this.proposition;

         }

         @Override

         public List<ActionDefinition> getActions(){

                 return this.actions;

         }

         @Override

         public Map<String, String> getAttributes() {

                 return this.attributes; 

         }

     @Override

     public Long getVersionNumber() {

         return versionNumber;

     }

         /**

      * This builder is used to construct instances of KRMS Repository Rule.  It enforces the constraints of the {@link RuleDefinitionContract}.

      */

     public static class Builder implements RuleDefinitionContract, ModelBuilder, Serializable {                

         private static final long serialVersionUID = -7850514191699945347L;

                 private String id;

         private String name;

         private String namespace;

         private String typeId;

         private String propId;

         private PropositionDefinition.Builder proposition;

         private List<ActionDefinition.Builder> actions;

         private Map<String, String> attributes;

         private Long versionNumber;

                 /**

                  * Private constructor for creating a builder with all of it's required attributes.

                  */

         private Builder(String ruleId, String name, String namespace, String typeId, String propId) {

             setId(ruleId);

             setName(name);

             setNamespace(namespace);

             setTypeId(typeId);

             setPropId(propId);

             setAttributes(new HashMap<String, String>());

         }

         public static Builder create(String ruleId, String name, String namespace, String typeId, String propId){

                 return new Builder(ruleId, name, namespace, typeId, propId);

         }

         /**

          * Creates a builder by populating it with data from the given {@link RuleDefinitionContract}.

          * 

          * @param contract the contract from which to populate this builder

          * @return an instance of the builder populated with data from the contract

          */

         public static Builder create(RuleDefinitionContract contract) {

                 if (contract == null) {

                 throw new IllegalArgumentException("contract is null");

             }

                 List <ActionDefinition.Builder> actionList = new ArrayList<ActionDefinition.Builder>();

                 if (contract.getActions() != null){

                         for (ActionDefinitionContract actionContract : contract.getActions()){

                                 ActionDefinition.Builder actBuilder = ActionDefinition.Builder.create(actionContract);

                                 actionList.add(actBuilder);

                         }

                 }

             Builder builder =  new Builder(contract.getId(), contract.getName(),

                             contract.getNamespace(), contract.getTypeId(), contract.getPropId());

             if (contract.getProposition() != null) {

                 builder.setProposition(PropositionDefinition.Builder.create(contract.getProposition()));

             }

                 if (contract.getAttributes() != null){

                 builder.setAttributes(new HashMap<String, String>(contract.getAttributes()));

                 }

             builder.setActions(actionList);

             builder.setVersionNumber(contract.getVersionNumber());

             return builder;

         }

                 /**

                  * Sets the value of the id on this builder to the given value.

                  * 

                  * @param id the id value to set, must not be null or blank

                  * @throws IllegalArgumentException if the id is null or blank

                  */

         public void setId(String ruleId) {

             if (ruleId != null && StringUtils.isBlank(ruleId)) {

                 throw new IllegalArgumentException("rule ID must be null or else non-blank");

             }

                         this.id = ruleId;

                 }

         public void setName(String name) {

             if (StringUtils.isBlank(name)) {

                 throw new IllegalArgumentException("name is blank");

             }

                         this.name = name;

                 }

         public void setNamespace(String namespace) {

             if (StringUtils.isBlank(namespace)) {

                 throw new IllegalArgumentException("namespace is blank");

             }

                         this.namespace = namespace;

                 }

                 public void setTypeId(String typeId) {

                         if (StringUtils.isBlank(typeId)) {

                         throw new IllegalArgumentException("KRMS type id is blank");

                         }

                         this.typeId = typeId;

                 }

                 public void setPropId(String propId) {

                     if (propId != null && StringUtils.isBlank(propId)) {

                         throw new IllegalArgumentException("propId must be null or non-blank");

                     }

                         this.propId = propId;

                 }

                 public void setProposition(PropositionDefinition.Builder prop) {

                         this.proposition = prop;

                         this.setPropId(prop.getId());

                 }

                 public void setActions(List<ActionDefinition.Builder> actions) {

                         if (actions == null){

                                 this.actions = Collections.unmodifiableList(new ArrayList<ActionDefinition.Builder>());

                                 return;

                         }

                         this.actions = Collections.unmodifiableList(actions);

                 }

                 public void setAttributes(Map<String, String> attributes){

                         if (attributes == null){

                                 this.attributes = Collections.emptyMap();

                         }

                         this.attributes = Collections.unmodifiableMap(attributes);

                 }

         public void setVersionNumber(Long versionNumber){

             this.versionNumber = versionNumber;

         }

                 @Override

                 public String getId() {

                         return id;

                 }

                 @Override

                 public String getName() {

                         return name;

                 }

                 @Override

                 public String getNamespace() {

                         return namespace;

                 }

                 @Override

                 public String getTypeId() {

                         return typeId;

                 }

                 @Override

                 public String getPropId() {

                         return propId;

                 }

                 @Override

                 public PropositionDefinition.Builder getProposition() {

                         return proposition;

                 }

                 @Override

                 public List<ActionDefinition.Builder> getActions(){

                         return actions;

                 }

                 @Override

                 public Map<String, String> getAttributes() {

                         return attributes;

                 }

         @Override

         public Long getVersionNumber() {

             return versionNumber;

         }

                 /**

                  * Builds an instance of a Rule based on the current state of the builder.

                  * 

                  * @return the fully-constructed Rule

                  */

         @Override

         public RuleDefinition build() {

             return new RuleDefinition(this);

         }

     }

         @Override

         public int hashCode() {

                 return HashCodeBuilder.reflectionHashCode(this, Constants.HASH_CODE_EQUALS_EXCLUDE);

         }

         @Override

         public boolean equals(Object obj) {

                 return EqualsBuilder.reflectionEquals(obj, this, Constants.HASH_CODE_EQUALS_EXCLUDE);

         }

         @Override

         public String toString() {

                 return ToStringBuilder.reflectionToString(this);

         }

         /**

          * Defines some internal constants used on this class.

          */

         public static class Constants {

                 final static String ROOT_ELEMENT_NAME = "rule";

                 final static String TYPE_NAME = "RuleType";

                 final static String[] HASH_CODE_EQUALS_EXCLUDE = { CoreConstants.CommonElements.FUTURE_ELEMENTS };

         }

         /**

          * A private class which exposes constants which define the XML element names to use

          * when this object is marshalled to XML.

          */

         public static class Elements {

                 final static String ID = "id";

                 final static String NAME = "name";

                 final static String NAMESPACE = "namespace";

                 final static String TYPE_ID = "typeId";

                 final static String PROPOSITION = "proposition";

                 final static String ACTIONS = "actions";

                 final static String ACTION = "action";

                 final static String ATTRIBUTES = "attributes";

         }

 }