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package cgeo.geocaching.utils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
public abstract class LazyInitializedList<ElementType> implements Iterable<ElementType> {
private volatile List<ElementType> list;
private void initializeList() {
if (list == null) {
synchronized (this) {
if (list == null) {
list = loadFromDatabase();
}
}
}
}
protected abstract List<ElementType> loadFromDatabase();
public void add(final ElementType element) {
initializeList();
list.add(element);
}
public void prepend(final ElementType element) {
initializeList();
list.add(0, element);
}
public void set(final List<ElementType> elements) {
list = new ArrayList<ElementType>(elements);
}
public void set(LazyInitializedList<ElementType> other) {
list = new ArrayList<ElementType>(other.asList());
}
public boolean isEmpty() {
initializeList();
return list.isEmpty();
}
public ElementType remove(final int index) {
initializeList();
return list.remove(index);
}
public void add(int index, final ElementType element) {
initializeList();
list.add(index, element);
}
public int size() {
initializeList();
return list.size();
}
@Override
public Iterator<ElementType> iterator() {
initializeList();
return list.iterator();
}
public ElementType get(final int index) {
initializeList();
return list.get(index);
}
public boolean contains(final ElementType element) {
initializeList();
return list.contains(element);
}
public boolean isNotEmpty() {
initializeList();
return !list.isEmpty();
}
/**
* @return an unmodifiable list of the elements
*/
public List<ElementType> asList() {
initializeList();
return Collections.unmodifiableList(list);
}
public int indexOf(ElementType element) {
initializeList();
return list.indexOf(element);
}
}
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