com.fizzed.crux.util.MoreObjects Maven / Gradle / Ivy
/*
* Copyright 2018 Fizzed, 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.fizzed.crux.util;
import java.util.Collection;
import java.util.Map;
import java.util.Objects;
/**
* Methods that java.util.Objects should include.
*
* @author jjlauer
*/
public class MoreObjects {
/**
* Null-safe evaluation of whether a boolean is true.
* @param value The value to check
* @return True if value is non-null AND true otherwise false
*/
static public boolean isTrue(Boolean value) {
return value != null && value;
}
/**
* Checks whether the value is in the list of values.
* @param The type
* @param value The value to check
* @param values The list of values to check against
* @return True if the value is contained otherwise false
*/
static public boolean in(T value, T... values) {
if (values == null) {
throw new IllegalArgumentException("values was null");
}
for (T v : values) {
if (Objects.equals(v, value)) {
return true;
}
}
return false;
}
/**
* Checks whether the value is in the list of values.
* @param The type
* @param value The value to check
* @param values The list of values to check against
* @return True if the value is contained otherwise false
*/
static public boolean in(T value, Iterable values) {
if (values == null) {
throw new IllegalArgumentException("values was null");
}
for (T v : values) {
if (Objects.equals(v, value)) {
return true;
}
}
return false;
}
/**
* Null-safe evaluation of whether an array is empty.
* @param
* @param values The array
* @return True if array is null or has 0 elements
*/
static public boolean isEmpty(T[] values) {
return values == null || values.length == 0;
}
/**
* Null-safe evaluation of whether a collection is empty.
* @param values The collection
* @return True if the collection is null or has 0 elements.
*/
static public boolean isEmpty(Collection values) {
return values == null || values.isEmpty();
}
/**
* Null-safe evaluation of whether an Iterable is empty.
* @param values The iterable
* @return True if the iterable is null or has 0 elements.
*/
static public boolean isEmpty(Iterable values) {
return values == null || !values.iterator().hasNext();
}
/**
* Null-safe evaluation of whether a map is empty.
* @param map The map
* @return True if the map is null or has 0 elements.
*/
static public boolean isEmpty(Map map) {
return map == null || map.isEmpty();
}
/**
* Checks if the string is null or has zero chars.
*/
static public boolean isEmpty(CharSequence chars) {
return chars == null || chars.length() == 0;
}
/**
* Checks if the string is null, empty, or has only characters consisting
* of spaces.
*/
static public boolean isBlank(CharSequence chars) {
if (chars == null || chars.length() == 0) {
return true;
}
for (int i = 0; i < chars.length(); i++) {
if (chars.charAt(i) != ' ') {
return false;
}
}
return true;
}
}