org.apache.openjpa.jdbc.kernel.exps.AndExpression Maven / Gradle / Ivy
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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.jdbc.kernel.exps;
import java.util.Map;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.exps.ExpressionVisitor;
/**
* Combines two expressions.
*
* @author Abe White
*/
class AndExpression
implements Exp {
private final Exp _exp1;
private final Exp _exp2;
/**
* Constructor. Supply the expressions to combine.
*/
public AndExpression(Exp exp1, Exp exp2) {
_exp1 = exp1;
_exp2 = exp2;
}
public ExpState initialize(Select sel, ExpContext ctx, Map contains) {
ExpState s1 = _exp1.initialize(sel, ctx, contains);
ExpState s2 = _exp2.initialize(sel, ctx, contains);
return new BinaryOpExpState(sel.and(s1.joins, s2.joins), s1, s2);
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer buf) {
BinaryOpExpState bstate = (BinaryOpExpState) state;
boolean paren1 = _exp1 instanceof OrExpression;
boolean paren2 = _exp2 instanceof OrExpression;
if (paren1)
buf.append("(");
_exp1.appendTo(sel, ctx, bstate.state1, buf);
if (paren1)
buf.append(")");
buf.append(" AND ");
if (paren2)
buf.append("(");
_exp2.appendTo(sel, ctx, bstate.state2, buf);
if (paren2)
buf.append(")");
sel.append(buf, state.joins);
}
public void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
BinaryOpExpState bstate = (BinaryOpExpState) state;
_exp1.selectColumns(sel, ctx, bstate.state1, pks);
_exp2.selectColumns(sel, ctx, bstate.state2, pks);
}
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_exp1.acceptVisit(visitor);
_exp2.acceptVisit(visitor);
visitor.exit(this);
}
}