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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.Joins;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.exps.ExpressionVisitor;
/**
* Tests whether a value is IN a subquery.
*
* @author Abe White
*/
class InSubQExpression
implements Exp {
private final Val _val;
private final SubQ _sub;
/**
* Constructor. Supply the value to test and the subquery.
*/
public InSubQExpression(Val val, SubQ sub) {
_val = val;
_sub = sub;
}
public ExpState initialize(Select sel, ExpContext ctx, Map contains) {
ExpState subqState = _sub.initialize(sel, ctx, 0);
ExpState valueState = _val.initialize(sel, ctx, 0);
return new InSubQExpState(valueState.joins, subqState, valueState);
}
/**
* Expression state.
*/
private static class InSubQExpState
extends ExpState {
public final ExpState subqState;
public final ExpState valueState;
public InSubQExpState(Joins joins, ExpState subqState,
ExpState valueState) {
super(joins);
this.subqState = subqState;
this.valueState = valueState;
}
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer buf) {
InSubQExpState istate = (InSubQExpState) state;
_sub.calculateValue(sel, ctx, istate.subqState, null, null);
_val.calculateValue(sel, ctx, istate.valueState, null, null);
_val.appendTo(sel, ctx, istate.valueState, buf, 0);
buf.append(" IN ");
_sub.appendTo(sel, ctx, istate.valueState, buf, 0);
}
public void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
InSubQExpState istate = (InSubQExpState) state;
_sub.selectColumns(sel, ctx, istate.subqState, pks);
_val.selectColumns(sel, ctx, istate.valueState, true);
}
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_val.acceptVisit(visitor);
_sub.acceptVisit(visitor);
visitor.exit(this);
}
}
