| /* |
| * 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; |
| |
| /** |
| * 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; |
| } |
| } |