/*

  * 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.krms.api.repository.function;

 import java.io.Serializable;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.List;

 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 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.krms.api.repository.type.KrmsTypeDefinition;

 import org.w3c.dom.Element;

 /**

  * An immutable representation of a function definition.

  * 

  * @see FunctionDefinitionContract

  * 

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

  *

  */

 @XmlRootElement(name = FunctionDefinition.Constants.ROOT_ELEMENT_NAME)

 @XmlAccessorType(XmlAccessType.NONE)

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

                 FunctionDefinition.Elements.ID,

                 FunctionDefinition.Elements.NAMESPACE,

                 FunctionDefinition.Elements.NAME,

                 FunctionParameterDefinition.Elements.DESCRIPTION,

                 FunctionDefinition.Elements.RETURN_TYPE,

                 FunctionDefinition.Elements.TYPE_ID,

                 FunctionDefinition.Elements.ACTIVE,

         CoreConstants.CommonElements.VERSION_NUMBER,

         FunctionDefinition.Elements.PARAMETERS,

         CoreConstants.CommonElements.FUTURE_ELEMENTS

 })

 public class FunctionDefinition implements FunctionDefinitionContract, ModelObjectComplete {

         private static final long serialVersionUID = 1391030685309770560L;

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

         private final String id;

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

         private final String namespace;

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

         private final String name;

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

         private final String description;

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

         private final String returnType;

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

         private final String typeId;

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

         private final boolean active;

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

         private final Long versionNumber;

         @XmlElementWrapper(name = Elements.PARAMETERS, required = false)

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

         private final List<FunctionParameterDefinition> parameters;

         @SuppressWarnings("unused")

     @XmlAnyElement

     private final Collection<Element> _futureElements = null;

         /**

      * Private constructor used only by JAXB.

      */

     private FunctionDefinition() {

             this.id = null;

             this.namespace = null;

             this.name = null;

             this.description = null;

             this.returnType = null;

             this.typeId = null;

             this.active = false;

             this.versionNumber = null;

             this.parameters = null;

     }

     private FunctionDefinition(Builder builder) {

             this.id = builder.getId();

             this.namespace = builder.getNamespace();

             this.name = builder.getName();

             this.description = builder.getDescription();

             this.returnType = builder.getReturnType();

             this.typeId = builder.getTypeId();

             this.active = builder.isActive();

             this.versionNumber = builder.getVersionNumber();

             this.parameters = new ArrayList<FunctionParameterDefinition>();

             for (FunctionParameterDefinition.Builder parameter : builder.getParameters()) {

                     this.parameters.add(parameter.build());

             }

     }

         @Override

         public String getId() {

                 return id;

         }

         @Override

         public String getNamespace() {

                 return namespace;

         }

         @Override

         public String getName() {

                 return name;

         }

         @Override

         public String getDescription() {

                 return description;

         }

         @Override

         public String getReturnType() {

                 return returnType;

         }

         @Override

         public String getTypeId() {

                 return typeId;

         }

         @Override

         public boolean isActive() {

                 return active;

         }

         @Override

         public Long getVersionNumber() {

                 return versionNumber;

         }

         @Override

         public List<FunctionParameterDefinition> getParameters() {

                 return Collections.unmodifiableList(parameters);

         }

         /**

          * A builder which can be used to construct {@link FunctionDefinition}

          * instances.  Enforces the constraints of the {@link FunctionDefinitionContract}.

          * 

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

          *

          */

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

             private static final long serialVersionUID = -4470376239998290245L;

                 private String id;

             private String namespace;

             private String name;

             private String description;

             private String returnType;

             private String typeId;

             private boolean active;

             private Long versionNumber;

             private List<FunctionParameterDefinition.Builder> parameters;

         private Builder(String namespace, String name, String returnType, String typeId) {

                 setNamespace(namespace);

                 setName(name);

                 setReturnType(returnType);

                 setTypeId(typeId);

                 setActive(true);

                 setParameters(new ArrayList<FunctionParameterDefinition.Builder>());

         }

         /**

          * Creates a function definition builder with the given required values.  This builder

          * is the only means by which a {@link FunctionDefinition} object should be created.

          * 

          * <p>Will default the active flag to true.

          * 

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

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

          * @param returnType the return type of the function definition to create, must not be null or blank

          * @param typeId the return type id of the function definition to create, must not be null or blank

          * 

          * @return a builder with the required values already initialized

          * 

          * @throws IllegalArgumentException if any of the given arguments is null or blank

          */

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

                 return new Builder(namespace, name, returnType, typeId);

         }

         /**

          * Creates and populates a builder with the data on the given {@link FunctionDefinitionContract}.

          * This is similar in nature to a "copy constructor" for {@link FunctionDefinition}.

          * 

          * @param contract an object implementing the {@link FunctionDefinitionContract} 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(FunctionDefinitionContract contract) {

                 if (contract == null) {

                         throw new IllegalArgumentException("contract was null");

                 }

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

                 builder.setId(contract.getId());

                 builder.setDescription(contract.getDescription());

                 builder.setActive(contract.isActive());

                 builder.setVersionNumber(contract.getVersionNumber());

                 for (FunctionParameterDefinitionContract parameter : contract.getParameters()) {

                         builder.getParameters().add(FunctionParameterDefinition.Builder.create(parameter));

                 }

                 return builder;

         }

         @Override

         public FunctionDefinition build() {

                 return new FunctionDefinition(this);

         }

         @Override

                 public String getId() {

                         return this.id;

                 }

         /**

          * Sets the id for the function definition that will be returned by this builder.

          * 

          * @param id the function definition id to set

          */

                 public void setId(String id) {

                         this.id = id;

                 }

                 @Override

                 public String getNamespace() {

                         return this.namespace;

                 }

         /**

          * Sets the namespace code for the function definition that will be returned by this builder.

          * The namespace must not be null or blank.

          * 

          * @param namespace the namespace code to set on this builder, must not be null or blank

          * 

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

          */

                 public void setNamespace(String namespace) {

                         if (StringUtils.isBlank(namespace)) {

                                 throw new IllegalArgumentException("namespace was blank");

                         }

                         this.namespace = namespace;

                 }

                 @Override

                 public String getName() {

                         return this.name;

                 }

                 /**

          * Sets the name for the function definition that will be returned by this builder.

          * The name must not be null or blank.

          * 

          * @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 was blank");

                         }

                         this.name = name;

                 }

                 @Override

                 public String getDescription() {

                         return this.description;

                 }

         /**

          * Sets the description for the function definition that will be returned by this builder.

          * 

          * @param description the description to set on this builder

          */

                 public void setDescription(String description) {

                         this.description = description;

                 }

                 @Override

                 public String getReturnType() {

                         return this.returnType;

                 }

                 /**

          * Sets the return type for the function definition that will be

          * returned by this builder.  This can be one of a set of "built-in"

          * data types or a custom datatype represented as a fully qualified

          * java class name.  The returnType must not be null or blank.

          * 

          * @param returnType the returnType to set on this builder, must not be null or blank

          * 

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

          */

                 public void setReturnType(String returnType) {

                         if (StringUtils.isBlank(returnType)) {

                                 throw new IllegalArgumentException("returnType was blank");

                         }

                         this.returnType = returnType;

                 }

                 @Override

                 public String getTypeId() {

                         return this.typeId;

                 }

                 /**

          * Sets the id of the {@link KrmsTypeDefinition} which defines the

          * actual implementation of this function.  The typeId must not be

          * null or blank.

          * 

          * @param typeId the typeId to set on this builder, must not be null or blank

          * 

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

          */

                 public void setTypeId(String typeId) {

                         if (StringUtils.isBlank(typeId)) {

                                 throw new IllegalArgumentException("typeId was blank");

                         }

                         this.typeId = typeId;

                 }

                 @Override

                 public boolean isActive() {

                         return this.active;

                 }

                 /**

          * Sets the active flag for the function definition that will be

          * returned by this builder.

          * 

          * @param active the active flag to set

          */

                 public void setActive(boolean active) {

                         this.active = active;

                 }

                 @Override

                 public Long getVersionNumber() {

                         return this.versionNumber;

                 }

                 /**

          * Sets the version number for the function definition 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 FunctionDefinitionContract} when

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

          * 

          * @param versionNumber the version number to set

          */

                 public void setVersionNumber(Long versionNumber) {

                         this.versionNumber = versionNumber;

                 }

                 @Override

                 public List<FunctionParameterDefinition.Builder> getParameters() {

                         return this.parameters;

                 }

                 /**

          * Sets the parameters for the function definition that will be returned by this builder.

          * This list is a list of builders for each of the {@link FunctionParameterDefinition}

          * instances that will form the parameters of this function definition.  The given list

          * must not be null.

          * 

          * @param parameters a list of builders for the parameters which will be specified on this function definition

          * 

          * @throws IllegalArgumentException if the given parameters list is null 

          */

                 public void setParameters(List<FunctionParameterDefinition.Builder> parameters) {

                         if (parameters == null) {

                                 throw new IllegalArgumentException("parameters was null");

                         }

                         this.parameters = parameters;

                 }

         }

         @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.

      */

     static class Constants {

         final static String ROOT_ELEMENT_NAME = "function";

         final static String TYPE_NAME = "FunctionType";

         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.

      */

     static class Elements {

         final static String ID = "id";

         final static String NAMESPACE = "namespace";

         final static String NAME = "name";

         final static String DESCRIPTION = "description";

         final static String RETURN_TYPE = "returnType";

         final static String TYPE_ID = "typeId";

         final static String ACTIVE = "active";

         final static String PARAMETERS = "parameters";

         final static String PARAMETER = "parameter";

     }

 }