nz.co.gregs.dbvolution.operators.DBPermittedRangeOperator Maven / Gradle / Ivy
/*
* Copyright 2013 Gregory Graham.
*
* 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 nz.co.gregs.dbvolution.operators;
import nz.co.gregs.dbvolution.datatypes.QueryableDatatype;
/**
* Implements a BETWEEN operator that includes the beginning of the range but
* excludes the end.
*
*
* Given a set of 1,2,3,4,5, using DBPermittedRangeExclusiveOperator(1,5) will
* produce an operation such that 1, 2, 3, and 4 will be returned, but not 5.
*
*
* Unbounded ranges are created by passing null as the lower- or upper-bound.
* For example, DBPermittedRangeExclusiveOperator(1,null) will produce an
* operation such that every number larger than 1 will be returned.
*
*
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*
* @author Gregory Graham
* @param
*/
public class DBPermittedRangeOperator extends DBMetaOperator {
private static final long serialVersionUID = 1L;
/**
* Implements a BETWEEN operator that includes the beginning of the range but
* excludes the end.
*
*
* Use a null value to create open or unbounded ranges.
*
* @param lowerBound the smallest value of the desired range
* @param upperBound the smallest value larger than the desired range
*/
public DBPermittedRangeOperator(T lowerBound, T upperBound) {
if (lowerBound != null && upperBound != null) {
operator = new DBBetweenInclusiveExclusiveOperator(
QueryableDatatype.getQueryableDatatypeForObject(lowerBound),
QueryableDatatype.getQueryableDatatypeForObject(upperBound));
} else if (lowerBound == null && upperBound != null) {
QueryableDatatype qdt = QueryableDatatype.getQueryableDatatypeForObject(upperBound);
operator = new DBLessThanOperator(qdt);
} else if (lowerBound != null && upperBound == null) {
final QueryableDatatype qdt = QueryableDatatype.getQueryableDatatypeForObject(lowerBound);
operator = new DBGreaterThanOrEqualsOperator(qdt);
}
}
}