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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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 implements Query {

  private final Collection collection;

  public QueryImpl(Collection collection) {
    this.collection = collection;
  }

  public List list() {
    return new ArrayList(collection);
  }

  public int count() {
    return collection.size();
  }

  @SuppressWarnings("unchecked")
  public  Query filterByType(ModelElementType elementType) {
    Class elementClass = (Class) elementType.getInstanceType();
    return filterByType(elementClass);
  }

  @SuppressWarnings("unchecked")
  public  Query filterByType(Class elementClass) {
    List filtered = new ArrayList();
    for (T instance : collection) {
      if (elementClass.isAssignableFrom(instance.getClass())) {
        filtered.add((V) instance);
      }
    }
    return new QueryImpl(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() + ">");
    }
  }
}