package ca.uhn.fhir.util;
/*
* #%L
* HAPI FHIR 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 ca.uhn.fhir.model.api.ICompositeElement;
import ca.uhn.fhir.model.api.IElement;
public class ElementUtil {
@SuppressWarnings("unchecked")
public static boolean isEmpty(Object... theElements) {
if (theElements == null) {
return true;
}
for (int i = 0; i < theElements.length; i++) {
Object next = theElements[i];
if (next instanceof List) {
if (!isEmpty((List<? extends IElement>) next)) {
return false;
}
} else if (next instanceof String && (!((String)next).isEmpty())) {
return false;
} else if (next != null && !((IElement) next).isEmpty()) {
return false;
}
}
return true;
}
public static boolean isEmpty(IElement... theElements) {
if (theElements == null) {
return true;
}
for (int i = 0; i < theElements.length; i++) {
IElement next = theElements[i];
if (next != null && !next.isEmpty()) {
return false;
}
}
return true;
}
public static boolean isEmpty(List<? extends IElement> theElements) {
if (theElements == null) {
return true;
}
for (int i = 0; i < theElements.size(); i++) {
IElement next = theElements.get(i);
if (next != null && !next.isEmpty()) {
return false;
}
}
return true;
}
/**
* @param theType Can be null
*/
public static <T extends IElement> List<T> allPopulatedChildElements(Class<T> theType, Object... theElements) {
ArrayList<T> retVal = new ArrayList<T>();
for (Object next : theElements) {
if (next == null) {
continue;
}else if (next instanceof IElement) {
addElement(retVal, (IElement) next, theType);
} else if (next instanceof List) {
for (Object nextElement : ((List<?>)next)) {
if (!(nextElement instanceof IElement)) {
throw new IllegalArgumentException("Found element of "+nextElement.getClass());
}
addElement(retVal, (IElement) nextElement, theType);
}
} else {
throw new IllegalArgumentException("Found element of "+next.getClass());
}
}
return retVal;
}
@SuppressWarnings("unchecked")
private static <T extends IElement> void addElement(ArrayList<T> retVal, IElement next, Class<T> theType) {
if (theType == null|| theType.isAssignableFrom(next.getClass())) {
retVal.add((T) next);
}
if (next instanceof ICompositeElement) {
retVal.addAll(((ICompositeElement) next).getAllPopulatedChildElementsOfType(theType));
}
}
}