org.tinygroup.tinysqldsl.expression.relational.ExistsExpression Maven / Gradle / Ivy
/**
* Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
*
* Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
*
* 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.tinygroup.tinysqldsl.expression.relational;
import org.tinygroup.tinysqldsl.base.Condition;
import org.tinygroup.tinysqldsl.base.StatementSqlBuilder;
import org.tinygroup.tinysqldsl.expression.Expression;
public class ExistsExpression implements Expression {
private Expression rightExpression;
private boolean not = false;
public ExistsExpression(Expression rightExpression) {
this(rightExpression, false);
}
public ExistsExpression(Expression rightExpression, boolean not) {
super();
this.rightExpression = rightExpression;
this.not = not;
}
public static Condition existsCondition(Expression rightExpression,
Object... values) {
return new Condition(new ExistsExpression(rightExpression), values);
}
public static Condition notExistsCondition(Expression rightExpression,
Object... values) {
return new Condition(new ExistsExpression(rightExpression, true), values);
}
public Expression getRightExpression() {
return rightExpression;
}
public boolean isNot() {
return not;
}
public String getStringExpression() {
return ((not) ? "NOT " : "") + "EXISTS";
}
public String toString() {
return getStringExpression() + " " + rightExpression.toString();
}
public void builderExpression(StatementSqlBuilder builder) {
StringBuilder buffer = builder.getStringBuilder();
if (isNot()) {
buffer.append("NOT EXISTS ");
} else {
buffer.append("EXISTS ");
}
getRightExpression().builderExpression(builder);
}
}