package ca.uhn.fhir.model.api;
   
   /*
    * #%L
    * HAPI FHIR - Core Library
    * %%
    * Copyright (C) 2014 University Health Network
    * %%
    * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
   * 
   * 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.
   * #L%
   */
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.commons.lang3.Validate;
  
  import ca.uhn.fhir.model.api.annotation.Child;
  import ca.uhn.fhir.model.api.annotation.DatatypeDef;
  import ca.uhn.fhir.model.primitive.StringDt;
  
  @DatatypeDef(name="Extension") 
  public class ExtensionDt extends BaseIdentifiableElement implements ICompositeDatatype {
  
  	private boolean myModifier;
  	
  	@Child(name="url", type=StringDt.class, order=0, min=1, max=1)	
  	private StringDt myUrl;
  
  	@Child(name="value", type=IDatatype.class, order=1, min=0, max=1)	
  	private IElement myValue;
  	
  	public ExtensionDt() {
  	}
  
  	public ExtensionDt(boolean theIsModifier) {
  		myModifier = theIsModifier;
  	}
  
  	public ExtensionDt(boolean theIsModifier, String theUrl) {
  		Validate.notEmpty(theUrl, "URL must be populated");
  
  		myModifier = theIsModifier;
  		myUrl = new StringDt(theUrl);
  	}
  
  	public ExtensionDt(boolean theIsModifier, String theUrl, IDatatype theValue) {
  		Validate.notEmpty(theUrl, "URL must be populated");
  		Validate.notNull(theValue, "Value must not be null");
  
  		myModifier = theIsModifier;
  		myUrl = new StringDt(theUrl);
  		myValue=theValue;
  	}
  
  	public StringDt getUrl() {
  		if (myUrl==null) {
  			myUrl=new StringDt();
  		}
  		return myUrl;
  	}
  
  	public String getUrlAsString() {
  		return getUrl().getValue();
  	}
  
  	/**
  	 * Returns the value of this extension, if one exists.
  	 * <p>
  	 * Note that if this extension contains extensions (instead of a datatype) then <b>this method will return null</b>. In that case, you must use {@link #getUndeclaredExtensions()} and
  	 * {@link #getUndeclaredModifierExtensions()} to retrieve the child extensions.
  	 * </p>
  	 */
  	public IElement getValue() {
  		return myValue;
  	}
  
  	/**
  	 * Returns the value of this extension, casted to a primitive datatype. This is a convenience method which should only be called if you are sure that the value for this particular extension will
  	 * be a primitive.
  	 * <p>
  	 * Note that if this extension contains extensions (instead of a datatype) then <b>this method will return null</b>. In that case, you must use {@link #getUndeclaredExtensions()} and
  	 * {@link #getUndeclaredModifierExtensions()} to retrieve the child extensions.
  	 * </p>
  	 * 
  	 * @throws ClassCastException
  	 *             If the value of this extension is not a primitive datatype
  	 */
  	public IPrimitiveDatatype<?> getValueAsPrimitive() {
 		if (!(getValue() instanceof IPrimitiveDatatype)) {
 			throw new ClassCastException("Extension with URL["+myUrl+"] can not be cast to primitive type, type is: "+ getClass().getCanonicalName());
 		}
 		return (IPrimitiveDatatype<?>) getValue();
 	}
 	
 	@Override
 	public boolean isEmpty() {
 		return super.isBaseEmpty() && (myValue == null || myValue.isEmpty());
 	}
 
 	public boolean isModifier() {
 		return myModifier;
 	}
 
 	public void setModifier(boolean theModifier) {
 		myModifier = theModifier;
 	}
 
 	public ExtensionDt setUrl(String theUrl) {
 		myUrl = new StringDt(theUrl);
 		return this;
 	}
 
 	public ExtensionDt setUrl(StringDt theUrl) {
 		myUrl = theUrl;
 		return this;
 	}
 
 	public void setValue(IElement theValue) {
 		myValue = theValue;
 	}
 
 	@Override
 	public <T extends IElement> List<T> getAllPopulatedChildElementsOfType(Class<T> theType) {
 		return new ArrayList<T>();
 	}
 
 }