/*
* Copyright (c) 2013-2017 Cinchapi Inc.
*
* 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 com.cinchapi.concourse.server.concurrent;
import java.util.List;
import com.cinchapi.concourse.server.model.Value;
import com.cinchapi.concourse.thrift.Operator;
import com.google.common.collect.Range;
import com.google.common.collect.Lists;
/**
* A collection of utility functions for dealing with {@link RangeToken}
* objects.
*
* @author Jeff Nelson
*/
public final class RangeTokens {
/**
* Convert the specified range {@code token} to one or more {@link Range
* ranges} that provide the appropriate coverage.
*
* @param token
* @return the Ranges
*/
public static Iterable<Range<Value>> convertToRange(RangeToken token) {
List<Range<Value>> ranges = Lists.newArrayListWithCapacity(1);
if(token.getOperator() == Operator.EQUALS
|| token.getOperator() == null) { // null operator means
// the range token is for
// writing
ranges.add(Range.singleton(token.getValues()[0]));
}
else if(token.getOperator() == Operator.NOT_EQUALS) {
ranges.add(Range.lessThan(token.getValues()[0]));
ranges.add(Range.greaterThan(token.getValues()[0]));
}
else if(token.getOperator() == Operator.GREATER_THAN) {
ranges.add(Range.greaterThan(token.getValues()[0]));
}
else if(token.getOperator() == Operator.GREATER_THAN_OR_EQUALS) {
ranges.add(Range.atLeast(token.getValues()[0]));
}
else if(token.getOperator() == Operator.LESS_THAN) {
ranges.add(Range.lessThan(token.getValues()[0]));
}
else if(token.getOperator() == Operator.LESS_THAN_OR_EQUALS) {
ranges.add(Range.atMost(token.getValues()[0]));
}
else if(token.getOperator() == Operator.BETWEEN) {
Value a = token.getValues()[0];
Value b = token.getValues()[1];
if(a == Value.NEGATIVE_INFINITY && b == Value.POSITIVE_INFINITY) {
ranges.add(Range.<Value> all());
}
else if(token.getValues().length == 3) {
ranges.add(Range.open(a, b));
}
else if(token.getValues().length == 4) {
ranges.add(Range.closed(a, b));
}
else if(token.getValues().length == 5) {
ranges.add(Range.openClosed(a, b));
}
else {
ranges.add(Range.closedOpen(a, b));
}
}
else if(token.getOperator() == Operator.REGEX
|| token.getOperator() == Operator.NOT_REGEX) {
ranges.add(Range.<Value> all());
}
else {
throw new UnsupportedOperationException();
}
return ranges;
}
}