/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed 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 net.ontopia.persistence.query.jdo;
/**
* INTERNAL: JDOQL method: Collection.isEmpty(). Syntax: 'A.isEmpty()'.
*/
public class JDOIsEmpty implements JDOExpressionIF {
protected JDOValueIF value;
public JDOIsEmpty(JDOField value) {
this((JDOValueIF)value);
}
public JDOIsEmpty(JDOValueIF value) {
// FIXME: Can only be field[collection] or variable[collection]
this.value = value;
}
public int getType() {
return IS_EMPTY;
}
public JDOValueIF getValue() {
return value;
}
public int hashCode() {
return value.hashCode() + IS_EMPTY;
}
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj instanceof JDOIsEmpty) {
JDOIsEmpty other = (JDOIsEmpty)obj;
return (value.equals(other.value));
}
return false;
}
public String toString() {
return value + ".isEmpty()";
}
public void visit(JDOVisitorIF visitor) {
visitor.visitable(value);
}
}