/*
    * 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";
     }
     
 }