/*
* Copyright 2004-2009 the original author or authors.
*
* 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.slim3.datastore;
import java.util.List;
import com.google.appengine.api.datastore.Query.CompositeFilter;
import com.google.appengine.api.datastore.Query.CompositeFilterOperator;
import com.google.appengine.api.datastore.Query.Filter;
/**
* @author higa
* @since 1.0.16
*
*/
public class CompositeCriterion implements FilterCriterion {
/**
* The model meta data.
*/
protected ModelMeta<?> modelMeta;
/**
* The composite filter operator.
*/
protected CompositeFilterOperator operator;
/**
* The filter criteria.
*/
protected FilterCriterion[] criteria;
/**
* The filters.
*/
protected Filter[] filters;
/**
* Constructor.
*
* @param modelMeta
* the model meta data
*
* @param operator
* the composite filter operator
* @param criteria
* the filter criteria
* @throws NullPointerException
* if the modelMeta parameter is null or the operator parameter
* is null
*/
public CompositeCriterion(ModelMeta<?> modelMeta,
CompositeFilterOperator operator, FilterCriterion... criteria)
throws NullPointerException {
if (modelMeta == null) {
throw new NullPointerException(
"The modelMeta parameter must not be null.");
}
if (operator == null) {
throw new NullPointerException(
"The operator parameter must not be null.");
}
this.modelMeta = modelMeta;
this.operator = operator;
this.criteria = criteria;
List<Filter> filters2 = DatastoreUtil.toFilters(modelMeta, criteria);
switch (filters2.size()) {
case 0:
filters = new Filter[0];
break;
case 1:
filters = new Filter[] { filters2.get(0) };
break;
default:
filters = new Filter[] { new CompositeFilter(operator, filters2) };
}
}
/**
* Returns the model meta data.
*
* @return the model meta data
*/
public ModelMeta<?> getModelMeta() {
return modelMeta;
}
/**
* Returns the composite filter operator.
*
* @return the composite filter operator
*/
public CompositeFilterOperator getOperator() {
return operator;
}
/**
* Returns the filter criteria.
*
* @return the filter criteria
*/
public FilterCriterion[] getCriteria() {
return criteria;
}
@Override
public Filter[] getFilters() {
return filters;
}
}