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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.search.sort;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import java.io.IOException;
import java.util.Locale;
/**
* A sorting order.
*
*
*/
public enum SortOrder implements Writeable<SortOrder> {
/**
* Ascending order.
*/
ASC {
@Override
public String toString() {
return "asc";
}
},
/**
* Descending order.
*/
DESC {
@Override
public String toString() {
return "desc";
}
};
private static final SortOrder PROTOTYPE = ASC;
@Override
public SortOrder readFrom(StreamInput in) throws IOException {
int ordinal = in.readVInt();
if (ordinal < 0 || ordinal >= values().length) {
throw new IOException("Unknown SortOrder ordinal [" + ordinal + "]");
}
return values()[ordinal];
}
public static SortOrder readOrderFrom(StreamInput in) throws IOException {
return PROTOTYPE.readFrom(in);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeVInt(this.ordinal());
}
public static SortOrder fromString(String op) {
return valueOf(op.toUpperCase(Locale.ROOT));
}
}
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