org.apache.openjpa.jdbc.kernel.exps.NotExpression Maven / Gradle / Ivy
/*
* 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;
/**
* Negates an expression.
*
* @author Abe White
*/
class NotExpression
implements Exp {
private final Exp _exp;
/**
* Constructor. Supply the expression to negate.
*/
public NotExpression(Exp exp) {
_exp = exp;
}
public ExpState initialize(Select sel, ExpContext ctx, Map contains) {
ExpState state = _exp.initialize(sel, ctx, contains);
return new NotExpState(sel.or(state.joins, null), state);
}
/**
* Expression state.
*/
private static class NotExpState
extends ExpState {
public final ExpState state;
public NotExpState(Joins joins, ExpState state) {
super(joins);
this.state = state;
}
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer buf) {
buf.append("NOT (");
_exp.appendTo(sel, ctx, ((NotExpState) state).state, buf);
buf.append(")");
}
public void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
_exp.selectColumns(sel, ctx, ((NotExpState) state).state, pks);
}
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_exp.acceptVisit(visitor);
visitor.exit(this);
}
}