org.apache.jackrabbit.spi.commons.query.qom.OrderingImpl 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.jackrabbit.spi.commons.query.qom;
import javax.jcr.query.qom.DynamicOperand;
import javax.jcr.query.qom.Ordering;
import javax.jcr.query.qom.QueryObjectModelConstants;
import org.apache.jackrabbit.commons.query.qom.Order;
import org.apache.jackrabbit.spi.commons.conversion.NamePathResolver;
/**
* OrderingImpl
...
*/
public class OrderingImpl extends AbstractQOMNode implements Ordering {
/**
* Empty OrderingImpl
array.
*/
public static final OrderingImpl[] EMPTY_ARRAY = new OrderingImpl[0];
/**
* Operand by which to order.
*/
private final DynamicOperandImpl operand;
/**
* The order.
*/
private final Order order;
OrderingImpl(NamePathResolver resolver,
DynamicOperandImpl operand,
String order) {
super(resolver);
this.operand = operand;
this.order = Order.getOrderByName(order);
}
/**
* The operand by which to order.
*
* @return the operand; non-null
*/
public DynamicOperand getOperand() {
return operand;
}
/**
* Gets the order.
*
* @return either - {@link QueryObjectModelConstants#JCR_ORDER_ASCENDING}
* or
- {@link QueryObjectModelConstants#JCR_ORDER_DESCENDING}
*
*/
public String getOrder() {
return order.getName();
}
/**
* @return true
if this ordering is ascending. Returns
* false
if ordering is descending.
*/
public boolean isAscending() {
return order == Order.ASCENDING;
}
//------------------------< AbstractQOMNode >-------------------------------
/**
* Accepts a visitor
and calls the appropriate visit method
* depending on the type of this QOM node.
*
* @param visitor the visitor.
*/
public Object accept(QOMTreeVisitor visitor, Object data) throws Exception {
return visitor.visit(this, data);
}
//------------------------< Object >----------------------------------------
public String toString() {
if (order == Order.ASCENDING) {
return operand + " ASC";
} else {
return operand + " DESC";
}
}
}