org.apache.openjpa.persistence.query.BinaryExpressionPredicate Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.openjpa.persistence.query;
/**
* Binary predicate combines two expressions with an operator.
*
* @author Pinaki Poddar
*
*/
class BinaryExpressionPredicate extends AbstractVisitable
implements Predicate, Visitable {
private static final long serialVersionUID = 1L;
protected final Expression _e1;
protected final Expression _e2;
protected final BinaryConditionalOperator _op;
private final BinaryConditionalOperator _nop;
private static final StringBuffer SPACE = new StringBuffer(" ");
BinaryExpressionPredicate(Expression e1, BinaryConditionalOperator op,
BinaryConditionalOperator nop, Expression e2) {
_e1 = e1;
_e2 = e2;
_op = op;
_nop = nop;
}
public final Expression getOperand() {
return _e1;
}
public final Expression getOperand2() {
return _e2;
}
public final BinaryConditionalOperator getOperator() {
return _op;
}
@Override
public Predicate and(Predicate predicate) {
return new AndPredicate(this, predicate);
}
@Override
public Predicate or(Predicate predicate) {
return new OrPredicate(this, predicate);
}
@Override
public Predicate not() {
if ( _nop == null)
throw new UnsupportedOperationException(this.toString());
return new BinaryExpressionPredicate(_e1, _nop, _op, _e2);
}
@Override
public String asExpression(AliasContext ctx) {
return asExpression((Visitable)_e1, ctx)
+ SPACE + _op + SPACE
+ asExpression((Visitable)_e2, ctx);
}
String asExpression(Visitable v, AliasContext ctx) {
String result = v.asExpression(ctx);
if (v instanceof QueryDefinitionImpl)
return "(" + result + ")";
return result;
}
}