/**
* 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.drill.exec.expr;
import org.apache.drill.common.map.CaseInsensitiveMap;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
/**
* Enum that contains two boolean types: TRUE and FALSE.
* Each has numeric representation and list of allowed literals.
* List of literals if formed according to
* {@link <a href="https://www.postgresql.org/docs/9.6/static/datatype-boolean.html">Postgre Documentation</a>}
*/
public enum BooleanType {
TRUE(1, Arrays.asList("t", "true", "y", "yes", "on", "1")),
FALSE(0, Arrays.asList("f", "false", "n", "no", "off", "0"));
private final int numericValue;
private final List<String> literals;
BooleanType(int numericValue, List<String> literals) {
this.numericValue = numericValue;
this.literals = literals;
}
public int getNumericValue() {
return numericValue;
}
public List<String> getLiterals() {
return literals;
}
/** Contains all literals that are allowed to represent boolean type. */
private static final Map<String, BooleanType> allLiterals = CaseInsensitiveMap.newHashMap();
static {
for (BooleanType booleanType : BooleanType.values()) {
for (String literal : booleanType.getLiterals()) {
allLiterals.put(literal, booleanType);
}
}
}
/**
* Finds boolean by passed literal.
* Leading or trailing whitespace is ignored, and case does not matter.
*
* @param literal boolean string representation
* @return boolean type
* @throws IllegalArgumentException if boolean type is not found
*/
public static BooleanType get(String literal) {
final String value = literal.trim();
final BooleanType booleanType = allLiterals.get(value);
if (booleanType == null) {
throw new IllegalArgumentException("Invalid value for boolean: " + literal);
}
return booleanType;
}
}