net.bytebuddy.utility.CompoundList Maven / Gradle / Ivy
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/*
* Copyright 2014 - Present Rafael Winterhalter
*
* 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 net.bytebuddy.utility;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Creates a list representation of two lists as a single, compound list.
*/
public class CompoundList {
/**
* A compound list cannot be created.
*/
private CompoundList() {
throw new UnsupportedOperationException("This class is a utility class and not supposed to be instantiated");
}
/**
* Creates a list of a single element and another list.
*
* @param left The left element.
* @param right The right list.
* @param The type of the list's elements.
* @return A compound list representing the element and the list.
*/
public static List of(S left, List right) {
if (right.isEmpty()) {
return Collections.singletonList(left);
} else {
List list = new ArrayList(1 + right.size());
list.add(left);
list.addAll(right);
return list;
}
}
/**
* Creates a list of a list and an element.
*
* @param left The left left.
* @param right The right element.
* @param The type of the list's elements.
* @return A compound list representing the element and the list.
*/
public static List of(List left, S right) {
if (left.isEmpty()) {
return Collections.singletonList(right);
} else {
List list = new ArrayList(left.size() + 1);
list.addAll(left);
list.add(right);
return list;
}
}
/**
* Creates a list of a left and right list.
*
* @param left The left list.
* @param right The right list.
* @param The type of the list's elements.
* @return A compound list representing the elements of both lists.
*/
public static List of(List left, List right) {
List list = new ArrayList(left.size() + right.size());
list.addAll(left);
list.addAll(right);
return list;
}
/**
* Creates a list of a left, a middle and a right list.
*
* @param left The left list.
* @param middle The middle list.
* @param right The right list.
* @param The type of the list's elements.
* @return A compound list representing the elements of all lists.
*/
public static List of(List left, List middle, List right) {
List list = new ArrayList(left.size() + middle.size() + right.size());
list.addAll(left);
list.addAll(middle);
list.addAll(right);
return list;
}
}