54 lines
1.8 KiB
Java
54 lines
1.8 KiB
Java
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package fr.pandacube.util;
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import java.util.AbstractList;
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import java.util.List;
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import java.util.function.Function;
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public class MappedListView<S, T> extends AbstractList<T> {
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private final List<S> backend;
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private final Function<S, T> getter;
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private final Function<T, S> setter;
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/**
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*
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* @param backend the list backing this list
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* @param getter the function converting the value from the backing list to the value of this list.
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* It is used for every operation involving reading data from the backing list and comparing existing data.
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* For instance, {@link #indexOf(Object)} iterate through the backing list, converting all the values
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* with {@code getter} before comparing them with the parameter of {@link #indexOf(Object)}.
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* before comparing
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* @param setter used for modification of the data in the list (typically {@code add} and {@code set} methods)
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*/
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public MappedListView(List<S> backend, Function<S, T> getter, Function<T, S> setter) {
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this.backend = backend;
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this.getter = getter;
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this.setter = setter;
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}
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@Override
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public int size() { return backend.size(); }
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@Override
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public T get(int index) { return getter.apply(backend.get(index)); }
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@Override
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public T set(int index, T element) { return getter.apply(backend.set(index, setter.apply(element))); }
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@Override
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public void add(int index, T element) { backend.add(index, setter.apply(element)); }
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@Override
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public T remove(int index) { return getter.apply(backend.remove(index)); }
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@Override
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public void clear() { backend.clear(); }
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@Override
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public List<T> subList(int fromIndex, int toIndex) {
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return new MappedListView<S, T>(backend.subList(fromIndex, toIndex), getter, setter);
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}
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@Override
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protected void removeRange(int fromIndex, int toIndex) {
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backend.subList(fromIndex, toIndex).clear();
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}
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}
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