org.apache.openjpa.jdbc.kernel.exps.BindVariableAndExpression 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
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* 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 a bind variable expression with another.
*
* @author Abe White
*/
class BindVariableAndExpression
implements Exp {
private final BindVariableExpression _bind;
private final Exp _exp;
/**
* Constructor. Supply the two combined expressions.
*/
public BindVariableAndExpression(BindVariableExpression bind, Exp exp) {
_bind = bind;
_exp = exp;
}
public ExpState initialize(Select sel, ExpContext ctx, Map contains) {
ExpState s1 = _bind.initialize(sel, ctx, contains);
ExpState s2 = _exp.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) {
boolean or = _exp instanceof OrExpression;
if (or)
buf.append("(");
_exp.appendTo(sel, ctx, ((BinaryOpExpState) state).state2, buf);
if (or)
buf.append(")");
}
public void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
_exp.selectColumns(sel, ctx, ((BinaryOpExpState) state).state2, pks);
}
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_bind.acceptVisit(visitor);
_exp.acceptVisit(visitor);
visitor.exit(this);
}
}