/*
* Copyright 2014 - 2017 Blazebit.
*
* 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 com.blazebit.persistence.view.impl.filter;
import com.blazebit.persistence.RestrictionBuilder;
import com.blazebit.persistence.view.SubqueryProvider;
/**
*
* @author Christian Beikov
* @since 1.0
*/
public class ComparisonFilterHelper {
private final ComparisonFilter filter;
private final Object value;
private final SubqueryProvider subqueryProvider;
public ComparisonFilterHelper(ComparisonFilter filter, Class<?> expectedType, Object value) {
if (filter == null) {
throw new NullPointerException("filter");
}
if (value == null) {
throw new NullPointerException("value");
}
this.filter = filter;
if (value instanceof SubqueryProvider) {
this.value = null;
this.subqueryProvider = (SubqueryProvider) value;
} else if (expectedType.isInstance(value)) {
this.value = value;
this.subqueryProvider = null;
} else {
this.value = FilterUtils.parseValue(expectedType, value);
this.subqueryProvider = null;
}
}
public <T> T apply(RestrictionBuilder<T> rb) {
if (subqueryProvider == null) {
return filter.applyRestriction(rb, value);
} else {
return subqueryProvider.createSubquery(filter.applySubquery(rb));
}
}
}