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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.persistence.query;

public class IsEmptyExpression extends UnaryExpressionPredicate {
	
    private static final long serialVersionUID = 1L;

    public IsEmptyExpression(Expression op) {
		super(op, UnaryConditionalOperator.ISEMPTY,
			UnaryConditionalOperator.ISEMPTY_NOT);
	}

	@Override
	public String asExpression(AliasContext ctx) {
		return ((Visitable)_e).asExpression(ctx) + SPACE + _op;
	}
}