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The SoftiCAR Platform is a lightweight, Java-based library to create interactive business web applications.
package com.softicar.platform.common.container.list;
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* A list using {@link ArrayList} and {@link HashSet}.
*
* @author Oliver Richers
*/
public class HashList extends AbstractList {
private final Set set = new HashSet<>();
private final List list = new ArrayList<>();
public HashList() {
// nothing to do
}
public HashList(Collection elements) {
addAll(elements);
}
@Override
public boolean add(T element) {
if (set.add(element)) {
list.add(element);
return true;
} else {
return false;
}
}
@Override
public T remove(int index) {
T element = list.remove(index);
set.remove(element);
return element;
}
@Override
public boolean remove(Object element) {
if (set.remove(element)) {
list.remove(element);
return true;
} else {
return false;
}
}
@Override
public T get(int index) {
return list.get(index);
}
@Override
public int size() {
return list.size();
}
@Override
public boolean contains(Object element) {
return set.contains(element);
}
public void reverse() {
Collections.reverse(list);
}
}