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

 import java.io.Serializable;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.HashSet;

 import java.util.Map;

 import java.util.Set;

 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.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.agenda.AgendaDefinition;

 import org.kuali.rice.krms.api.repository.agenda.AgendaDefinitionContract;

 /**

  * An immutable representation of a context definition.  A context definition

  * defines information about a context which can be loaded into the rules

  * engine for evaluation.

  * 

  * A context definition includes a list of agendas which are valid within the

  * context.  Typically, during rule engine execution, one or more of these

  * agendas is selected for execution based on a given set of selection criteria.

  * 

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

  *

  */

 @XmlRootElement(name = ContextDefinition.Constants.ROOT_ELEMENT_NAME)

 @XmlAccessorType(XmlAccessType.NONE)

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

                 ContextDefinition.Elements.ID,

                 ContextDefinition.Elements.NAMESPACE,

                 ContextDefinition.Elements.NAME,

                 ContextDefinition.Elements.TYPE_ID,

                 ContextDefinition.Elements.AGENDAS,

                 ContextDefinition.Elements.ATTRIBUTES,

         CoreConstants.CommonElements.VERSION_NUMBER,

         CoreConstants.CommonElements.FUTURE_ELEMENTS

 })

 public final class ContextDefinition implements ContextDefinitionContract, ModelObjectComplete {

         private static final long serialVersionUID = -6639428234851623868L;

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

         private final String id;

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

     private final String name;

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

     private final String namespace;

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

     private final String typeId;

         @XmlElementWrapper(name = Elements.AGENDAS)

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

         private final Set<AgendaDefinition> agendas;

         @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;

     /**

      * Used only by JAXB.

      */

     private ContextDefinition() {

             this.id = null;

             this.name = null;

             this.namespace = null;

             this.typeId = null;

             this.agendas = null;

             this.versionNumber = null;

             this.attributes = null;

     }

     private ContextDefinition(Builder builder) {

             this.id = builder.getId();

             this.name = builder.getName();

             this.namespace = builder.getNamespace();

             this.typeId = builder.getTypeId();

             this.agendas = constructAgendas(builder.getAgendas());

             this.versionNumber = builder.getVersionNumber();

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

                 this.attributes = Collections.unmodifiableMap(new HashMap<String, String>(builder.getAttributes()));

         } else {

                 this.attributes = null;

         }

     }

     private static Set<AgendaDefinition> constructAgendas(Set<AgendaDefinition.Builder> agendaBuilders) {

             Set<AgendaDefinition> agendas = new HashSet<AgendaDefinition>();

             if (agendaBuilders != null) {

                     for (AgendaDefinition.Builder agendaBuilder : agendaBuilders) {

                             agendas.add(agendaBuilder.build());

                     }

             }

             return agendas;

     }

     @Override

         public String getId() {

                 return id;

         }

         @Override

         public String getNamespace() {

                 return namespace;

         }

         @Override

         public String getName() {

                 return name;

         }

         @Override

         public String getTypeId() {

                 return typeId;

         }

         @Override

         public Set<AgendaDefinition> getAgendas() {

                 return Collections.unmodifiableSet(this.agendas);

         }

         @Override

         public Map<String, String> getAttributes() {

                 return this.attributes; 

         }

         @Override

         public Long getVersionNumber() {

                 return versionNumber;

         }

         /**

          * A builder which can be used to construct ContextDefinition instances.  Enforces the

          * constraints of the {@link ContextDefinitionContract}.  This class is the only means

          * by which a {@link ContextDefinition} object can be constructed.

          * 

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

          *

          */

         public static final class Builder implements ContextDefinitionContract, ModelBuilder, Serializable  {

             private static final long serialVersionUID = -219369603932108436L;

                 private String id;

                 private String namespace;

         private String name;

         private String typeId;

         private Set<AgendaDefinition.Builder> agendas;

         private Map<String, String> attributes;

         private Long versionNumber;

         private Builder(String namespace, String name) {

                 setNamespace(namespace);

                 setName(name);

                 setAgendas(new HashSet<AgendaDefinition.Builder>());

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

         }

         /**

          * Creates a context definition builder with the given required values

          * 

          * @param namespace the namespace code of the context definition to create, must not be null or blank

          * @param name the name of the context definition to create, must not be null or blank

          * 

          * @return a builder with the required values already initialized

          * 

          * @throws IllegalArgumentException if the given namespace is null or blank

          * @throws IllegalArgumentException if the given name is null or blank

          */

         public static Builder create(String namespace, String name) {

                 return new Builder(namespace, name);

         }

         /**

          * Creates a populates a builder with the data on the given ContextDefinitionContract.

          * This is similar in nature to a "copy constructor" for Style.

          * 

          * @param contract an object implementing the ContextDefinitionContract from which

          * to copy property values

          *  

          * @return a builder with the values from the contract already initialized

          * 

          * @throws IllegalArgumentException if the given contract is null

          */

         public static Builder create(ContextDefinitionContract contract) {

                 if (contract == null) {

                         throw new IllegalArgumentException("contract was null");

                 }

                 Builder builder = create(contract.getNamespace(), contract.getName());

                 builder.setId(contract.getId());

                 builder.setTypeId(contract.getTypeId());

                 builder.setVersionNumber(contract.getVersionNumber());

                 builder.setAgendas(contract.getAgendas());

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

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

             }

                 return builder;

         }

         @Override

         public ContextDefinition build() {

                 return new ContextDefinition(this);

         }

                 @Override

                 public Long getVersionNumber() {

                         return this.versionNumber;

                 }

                 @Override

                 public String getId() {

                         return this.id;

                 }

                 @Override

                 public String getNamespace() {

                         return this.namespace;

                 }

                 @Override

                 public String getName() {

                         return this.name;

                 }

                 @Override

                 public String getTypeId() {

                         return this.typeId;

                 }

                 @Override

                 public Set<AgendaDefinition.Builder> getAgendas() {

                         return agendas;

                 }

                 @Override

                 public Map<String, String> getAttributes() {

                         return attributes;

                 }

                 /**

          * Sets the id for the context definition that will be created by this builder.

          * 

          * @param id the id to set

          */

                 public void setId(String id) {

                         if (id != null){

                                 if (StringUtils.isBlank(id)){

                                         throw new IllegalArgumentException("context id is blank");                                        

                                 }

                         }

                         this.id = id;

                 }

                 /**

                  * Sets the namespace code for the context definition that will be created

                  * by this builder.  The namespace code must not be blank or null.

                  * 

                  * @param namespace the namespace to set on this builder, must not be

                  * null or blank

                  * 

                  * @throws IllegalArgumentException if the given namespace code is null or blank

                  */

                 public void setNamespace(String namespace) {

                         if (StringUtils.isBlank(namespace)) {

                                 throw new IllegalArgumentException("namespace is blank");

                         }

                         this.namespace = namespace;

                 }

                 /**

                  * Sets the name for the context definition that will be created

                  * by this builder.  The name must not be blank or null.

                  * 

                  * @param name the name to set on this builder, must not be

                  * null or blank

                  * 

                  * @throws IllegalArgumentException if the given name is null or blank

                  */

                 public void setName(String name) {

                         if (StringUtils.isBlank(name)) {

                                 throw new IllegalArgumentException("name is blank");

                         }

                         this.name = name;

                 }

                 /**

          * Sets the typeId for the context definition that will be created by this builder.

          * 

          * @param typeId the typeId to set

          */

                 public void setTypeId(String typeId) {

                         if (typeId != null){

                                 if (StringUtils.isBlank(typeId)){

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

                                 }

                         }

                         this.typeId = typeId;

                 }

                 public void setAgendas(Set<? extends AgendaDefinitionContract> agendaContracts) {

                         this.agendas = new HashSet<AgendaDefinition.Builder>();

                         if (agendaContracts != null) for (AgendaDefinitionContract agendaContract : agendaContracts) {

                                 this.agendas.add(AgendaDefinition.Builder.create(agendaContract));

                         }

                 }

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

                         if (attributes == null){

                                 this.attributes = Collections.emptyMap();

                         }

                         this.attributes = Collections.unmodifiableMap(attributes);

                 }

                 /**

          * Sets the version number for the style that will be returned by this

          * builder.

          * 

          * <p>In general, this value should not be manually set on the builder,

          * but rather copied from an existing {@link ContextDefinitionContract} when

          * invoking {@link Builder#create(ContextDefinitionContract)}.

          * 

          * @param versionNumber the version number to set

          */

                 public void setVersionNumber(Long versionNumber) {

                         this.versionNumber = versionNumber;

                 }

         }

         @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 = "context";

         final static String TYPE_NAME = "ContextDefinitionType";

         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 NAMESPACE = "namespace";

         final static String NAME = "name";

         final static String TYPE_ID = "typeId";

         final static String AGENDA = "agenda";

         final static String AGENDAS = "agendas";

                 final static String ATTRIBUTES = "attributes";

     }

 }