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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.common;
public final class Booleans {
private Booleans() {
throw new AssertionError("No instances intended");
}
/**
* Parses a char[] representation of a boolean value to boolean.
*
* @return true iff the sequence of chars is "true", false iff the sequence of chars is "false" or the
* provided default value iff either text is null or length == 0.
* @throws IllegalArgumentException if the string cannot be parsed to boolean.
*/
public static boolean parseBoolean(char[] text, int offset, int length, boolean defaultValue) {
if (text == null || length == 0) {
return defaultValue;
} else {
return parseBoolean(new String(text, offset, length));
}
}
/**
* returns true iff the sequence of chars is one of "true","false".
*
* @param text sequence to check
* @param offset offset to start
* @param length length to check
*/
public static boolean isBoolean(char[] text, int offset, int length) {
if (text == null || length == 0) {
return false;
}
return isBoolean(new String(text, offset, length));
}
public static boolean isBoolean(String value) {
return isFalse(value) || isTrue(value);
}
/**
* Parses a string representation of a boolean value to boolean.
*
* @return true iff the provided value is "true". false iff the provided value is "false".
* @throws IllegalArgumentException if the string cannot be parsed to boolean.
*/
public static boolean parseBoolean(String value) {
if (isFalse(value)) {
return false;
}
if (isTrue(value)) {
return true;
}
throw new IllegalArgumentException("Failed to parse value [" + value + "] as only [true] or [false] are allowed.");
}
private static boolean hasText(CharSequence str) {
if (str == null || str.length() == 0) {
return false;
}
int strLen = str.length();
for (int i = 0; i < strLen; i++) {
if (!Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
/**
*
* @param value text to parse.
* @param defaultValue The default value to return if the provided value is null.
* @return see {@link #parseBoolean(String)}
*/
public static boolean parseBoolean(String value, boolean defaultValue) {
if (hasText(value)) {
return parseBoolean(value);
}
return defaultValue;
}
public static Boolean parseBoolean(String value, Boolean defaultValue) {
if (hasText(value)) {
return parseBoolean(value);
}
return defaultValue;
}
/**
* Returns {@code false} if text is in "false", "0", "off", "no"; else, {@code true}.
*
* @deprecated Only kept to provide automatic upgrades for pre 6.0 indices. Use {@link #parseBoolean(String, Boolean)} instead.
*/
@Deprecated
public static Boolean parseBooleanLenient(String value, Boolean defaultValue) {
if (value == null) { // only for the null case we do that here!
return defaultValue;
}
return parseBooleanLenient(value, false);
}
/**
* Returns {@code false} if text is in "false", "0", "off", "no"; else, {@code true}.
*
* @deprecated Only kept to provide automatic upgrades for pre 6.0 indices. Use {@link #parseBoolean(String, boolean)} instead.
*/
@Deprecated
public static boolean parseBooleanLenient(String value, boolean defaultValue) {
if (value == null) {
return defaultValue;
}
return !(value.equals("false") || value.equals("0") || value.equals("off") || value.equals("no"));
}
/**
* @return {@code true} iff the value is "false", otherwise {@code false}.
*/
public static boolean isFalse(String value) {
return "false".equals(value);
}
/**
* @return {@code true} iff the value is "true", otherwise {@code false}.
*/
public static boolean isTrue(String value) {
return "true".equals(value);
}
/**
* Returns {@code false} if text is in "false", "0", "off", "no"; else, {@code true}.
*
* @deprecated Only kept to provide automatic upgrades for pre 6.0 indices. Use {@link #parseBoolean(char[], int, int, boolean)} instead
*/
@Deprecated
public static boolean parseBooleanLenient(char[] text, int offset, int length, boolean defaultValue) {
if (text == null || length == 0) {
return defaultValue;
}
if (length == 1) {
return text[offset] != '0';
}
if (length == 2) {
return !(text[offset] == 'n' && text[offset + 1] == 'o');
}
if (length == 3) {
return !(text[offset] == 'o' && text[offset + 1] == 'f' && text[offset + 2] == 'f');
}
if (length == 5) {
return !(text[offset] == 'f' && text[offset + 1] == 'a' && text[offset + 2] == 'l' && text[offset + 3] == 's' &&
text[offset + 4] == 'e');
}
return true;
}
/**
* returns true if the a sequence of chars is one of "true","false","on","off","yes","no","0","1"
*
* @param text sequence to check
* @param offset offset to start
* @param length length to check
*
* @deprecated Only kept to provide automatic upgrades for pre 6.0 indices. Use {@link #isBoolean(char[], int, int)} instead.
*/
@Deprecated
public static boolean isBooleanLenient(char[] text, int offset, int length) {
if (text == null || length == 0) {
return false;
}
if (length == 1) {
return text[offset] == '0' || text[offset] == '1';
}
if (length == 2) {
return (text[offset] == 'n' && text[offset + 1] == 'o') || (text[offset] == 'o' && text[offset + 1] == 'n');
}
if (length == 3) {
return (text[offset] == 'o' && text[offset + 1] == 'f' && text[offset + 2] == 'f') ||
(text[offset] == 'y' && text[offset + 1] == 'e' && text[offset + 2] == 's');
}
if (length == 4) {
return (text[offset] == 't' && text[offset + 1] == 'r' && text[offset + 2] == 'u' && text[offset + 3] == 'e');
}
if (length == 5) {
return (text[offset] == 'f' && text[offset + 1] == 'a' && text[offset + 2] == 'l' && text[offset + 3] == 's' &&
text[offset + 4] == 'e');
}
return false;
}
}