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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* 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;
/**
* Unary Predicate results from an operator on an Expression.
*
* @author Pinaki Poddar
*
*/
class UnaryExpressionPredicate extends AbstractVisitable
implements Predicate, Visitable {
protected final Expression _e;
protected final UnaryConditionalOperator _op;
private final UnaryConditionalOperator _nop;
public UnaryExpressionPredicate(Expression e, UnaryConditionalOperator op,
UnaryConditionalOperator nop) {
this._e = e;
this._op = op;
this._nop = nop;
}
public Expression getOperand() {
return _e;
}
public UnaryConditionalOperator getOperator() {
return _op;
}
public Predicate and(Predicate predicate) {
return new AndPredicate(this, predicate);
}
public Predicate or(Predicate predicate) {
return new OrPredicate(this, predicate);
}
public Predicate not() {
if (_nop == null)
throw new UnsupportedOperationException(this.toString());
return new UnaryExpressionPredicate(_e, _nop, _op);
}
public String asExpression(AliasContext ctx) {
return _op + "(" + ((ExpressionImpl)_e).asExpression(ctx) + ")";
}
}