/* 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.
*/
package org.camunda.bpm.model.bpmn.impl;
import org.camunda.bpm.model.bpmn.BpmnModelException;
import org.camunda.bpm.model.bpmn.Query;
import org.camunda.bpm.model.xml.instance.ModelElementInstance;
import org.camunda.bpm.model.xml.type.ModelElementType;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* @author Sebastian Menski
*/
public class QueryImpl<T extends ModelElementInstance> implements Query<T> {
private final Collection<T> collection;
public QueryImpl(Collection<T> collection) {
this.collection = collection;
}
public List<T> list() {
return new ArrayList<T>(collection);
}
public int count() {
return collection.size();
}
@SuppressWarnings("unchecked")
public <V extends ModelElementInstance> Query<V> filterByType(ModelElementType elementType) {
Class<V> elementClass = (Class<V>) elementType.getInstanceType();
return filterByType(elementClass);
}
@SuppressWarnings("unchecked")
public <V extends ModelElementInstance> Query<V> filterByType(Class<V> elementClass) {
List<V> filtered = new ArrayList<V>();
for (T instance : collection) {
if (elementClass.isAssignableFrom(instance.getClass())) {
filtered.add((V) instance);
}
}
return new QueryImpl<V>(filtered);
}
public T singleResult() {
if (collection.size() == 1) {
return collection.iterator().next();
}
else {
throw new BpmnModelException("Collection expected to have <1> entry but has <" + collection.size() + ">");
}
}
}