com.github.mjeanroy.dbunit.commons.collections.Collections Maven / Gradle / Ivy
/**
* The MIT License (MIT)
*
* Copyright (c) 2015 Mickael Jeanroy
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.github.mjeanroy.dbunit.commons.collections;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Static Collection Utilities.
*/
public final class Collections {
private Collections() {
}
/**
* Map set of input to a set of outputs.
* Each results is produce in iteration order.
*
* @param inputs Set of inputs.
* @param mapper Mapper function.
* @param Type of inputs.
* @param Type of outputs.
* @return Set of outputs.
*/
public static Set map(Set inputs, Mapper mapper) {
Set outputs = new LinkedHashSet();
for (T input : inputs) {
outputs.add(mapper.apply(input));
}
return outputs;
}
/**
* Apply function to each element of a collection.
*
* @param inputs Collection of inputs.
* @param func Function to apply.
* @param Type of input.
*/
public static void forEach(Iterable inputs, Function func) {
for (T input : inputs) {
func.apply(input);
}
}
/**
* Find first value matching predicate.
*
* @param inputs Set of inputs.
* @param predicate Predicate function.
* @param Type of inputs.
* @return First input value matching predicate.
*/
public static T find(Iterable inputs, Predicate predicate) {
for (T input : inputs) {
if (predicate.apply(input)) {
return input;
}
}
return null;
}
public static List filter(List inputs, Predicate predicate) {
List outputs = new ArrayList(inputs.size());
for (T input : inputs) {
if (predicate.apply(input)) {
outputs.add(input);
}
}
return outputs;
}
/**
* Get a set of all keys found in a collection of {@link Map}.
*
* @param maps Collection of {@link Map}.
* @param Type of key.
* @param Type of values.
* @return Set of all keys.
*/
public static Set keys(Collection> maps) {
Set set = new LinkedHashSet();
for (Map map : maps) {
set.addAll(map.keySet());
}
return set;
}
}