org.modeshape.jcr.query.model.NullOrder Maven / Gradle / Ivy
/*
* ModeShape (http://www.modeshape.org)
*
* 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 org.modeshape.jcr.query.model;
import org.modeshape.common.util.CheckArg;
/**
* An enumeration for the kind of {@link Ordering}.
*/
public enum NullOrder implements Readable {
NULLS_FIRST("NULLS FIRST"),
NULLS_LAST("NULLS LAST");
public static NullOrder defaultOrder( Order order ) {
return order == Order.ASCENDING ? NullOrder.NULLS_LAST : NullOrder.NULLS_FIRST;
}
private final String symbol;
private NullOrder( String symbol ) {
this.symbol = symbol;
}
/**
* Get the symbolic representation of the order
*
* @return the symbolic representation; never null
*/
public String symbol() {
return symbol;
}
@Override
public String toString() {
return symbol;
}
/**
* Attempt to find the Order given a symbol. The matching is done independent of case.
*
* @param symbol the symbol
* @return the Order having the supplied symbol, or null if there is no Order with the supplied symbol
* @throws IllegalArgumentException if the symbol is null
*/
public static NullOrder forSymbol( String symbol ) {
CheckArg.isNotNull(symbol, "symbol");
if (NULLS_FIRST.symbol().equalsIgnoreCase(symbol)) return NULLS_FIRST;
if (NULLS_LAST.symbol().equalsIgnoreCase(symbol)) return NULLS_LAST;
return null;
}
@Override
public String getString() {
return symbol();
}
}
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