/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2009-2010 Sun Microsystems, Inc.
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*/
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package com.sun.opends.sdk.util;
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import java.util.*;
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/**
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* Additional {@code Collection} based utility methods.
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*/
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public final class Collections2
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{
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private static class TransformedCollection<M, N, P, C extends Collection<M>>
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extends AbstractCollection<N> implements Collection<N>
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{
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protected final C collection;
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protected final Function<? super M, ? extends N, P> funcMtoN;
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protected final Function<? super N, ? extends M, P> funcNtoM;
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protected final P p;
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protected TransformedCollection(final C collection,
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final Function<? super M, ? extends N, P> funcMtoN,
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final Function<? super N, ? extends M, P> funcNtoM, final P p)
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{
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this.collection = collection;
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this.funcMtoN = funcMtoN;
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this.funcNtoM = funcNtoM;
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this.p = p;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean add(final N e)
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{
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return collection.add(funcNtoM.apply(e, p));
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void clear()
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{
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collection.clear();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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@SuppressWarnings("unchecked")
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public boolean contains(final Object o)
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{
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final N tmp = (N) o;
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return collection.contains(funcNtoM.apply(tmp, p));
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean isEmpty()
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{
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return collection.isEmpty();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public Iterator<N> iterator()
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{
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return Iterators.transformedIterator(collection.iterator(), funcMtoN, p);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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@SuppressWarnings("unchecked")
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public boolean remove(final Object o)
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{
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final N tmp = (N) o;
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return collection.remove(funcNtoM.apply(tmp, p));
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int size()
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{
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return collection.size();
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}
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}
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private static final class TransformedList<M, N, P> extends
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TransformedCollection<M, N, P, List<M>> implements List<N>
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{
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private TransformedList(final List<M> list,
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final Function<? super M, ? extends N, P> funcMtoN,
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final Function<? super N, ? extends M, P> funcNtoM, final P p)
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{
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super(list, funcMtoN, funcNtoM, p);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void add(final int index, final N element)
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{
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collection.add(index, funcNtoM.apply(element, p));
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean addAll(final int index, final Collection<? extends N> c)
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{
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// We cannot transform c here due to type-safety.
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boolean result = false;
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for (final N e : c)
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{
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result |= add(e);
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}
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return result;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public N get(final int index)
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{
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return funcMtoN.apply(collection.get(index), p);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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@SuppressWarnings("unchecked")
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public int indexOf(final Object o)
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{
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final N tmp = (N) o;
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return collection.indexOf(funcNtoM.apply(tmp, p));
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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@SuppressWarnings("unchecked")
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public int lastIndexOf(final Object o)
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{
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final N tmp = (N) o;
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return collection.lastIndexOf(funcNtoM.apply(tmp, p));
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public ListIterator<N> listIterator()
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{
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return listIterator(0);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public ListIterator<N> listIterator(final int index)
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{
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final ListIterator<M> iterator = collection.listIterator(index);
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return new ListIterator<N>()
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{
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@Override
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public void add(final N e)
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{
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iterator.add(funcNtoM.apply(e, p));
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}
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@Override
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public boolean hasNext()
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{
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return iterator.hasNext();
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}
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@Override
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public boolean hasPrevious()
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{
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return iterator.hasPrevious();
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}
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@Override
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public N next()
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{
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return funcMtoN.apply(iterator.next(), p);
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}
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@Override
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public int nextIndex()
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{
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return iterator.nextIndex();
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}
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@Override
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public N previous()
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{
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return funcMtoN.apply(iterator.previous(), p);
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}
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@Override
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public int previousIndex()
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{
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return iterator.previousIndex();
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}
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@Override
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public void remove()
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{
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iterator.remove();
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}
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@Override
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public void set(final N e)
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{
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iterator.set(funcNtoM.apply(e, p));
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}
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};
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public N remove(final int index)
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{
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return funcMtoN.apply(collection.remove(index), p);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public N set(final int index, final N element)
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{
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final M result = collection.set(index, funcNtoM.apply(element, p));
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return funcMtoN.apply(result, p);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public List<N> subList(final int fromIndex, final int toIndex)
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{
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final List<M> subList = collection.subList(fromIndex, toIndex);
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return new TransformedList<M, N, P>(subList, funcMtoN, funcNtoM, p);
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}
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}
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/**
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* Returns a view of {@code collection} whose values have been mapped to
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* elements of type {@code N} using {@code funcMtoN}. The returned collection
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* supports all operations.
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*
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* @param <M>
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* The type of elements contained in {@code collection}.
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* @param <N>
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* The type of elements contained in the returned collection.
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* @param <P>
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* The type of the additional parameter to the function's
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* {@code apply} method. Use {@link java.lang.Void} for functions
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* that do not need an additional parameter.
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* @param collection
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* The collection to be transformed.
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* @param funcMtoN
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* A function which maps values of type {@code M} to values of type
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* {@code N}. This function will be used when retrieving values from
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* {@code collection}.
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* @param funcNtoM
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* A function which maps values of type {@code N} to values of type
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* {@code M}. This function will be used when performing queries and
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* adding values to {@code collection} .
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* @param p
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* A predicate specified parameter.
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* @return A view of {@code collection} whose values have been mapped to
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* elements of type {@code N} using {@code funcMtoN}.
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*/
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public static <M, N, P> Collection<N> transformedCollection(
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final Collection<M> collection,
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final Function<? super M, ? extends N, P> funcMtoN,
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final Function<? super N, ? extends M, P> funcNtoM, final P p)
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{
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return new TransformedCollection<M, N, P, Collection<M>>(collection,
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funcMtoN, funcNtoM, p);
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}
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/**
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* Returns a view of {@code collection} whose values have been mapped to
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* elements of type {@code N} using {@code funcMtoN}. The returned collection
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* supports all operations.
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*
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* @param <M>
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* The type of elements contained in {@code collection}.
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* @param <N>
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* The type of elements contained in the returned collection.
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* @param collection
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* The collection to be transformed.
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* @param funcMtoN
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* A function which maps values of type {@code M} to values of type
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* {@code N}. This function will be used when retrieving values from
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* {@code collection}.
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* @param funcNtoM
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* A function which maps values of type {@code N} to values of type
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* {@code M}. This function will be used when performing queries and
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* adding values to {@code collection} .
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* @return A view of {@code collection} whose values have been mapped to
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* elements of type {@code N} using {@code funcMtoN}.
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*/
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public static <M, N> Collection<N> transformedCollection(
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final Collection<M> collection,
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final Function<? super M, ? extends N, Void> funcMtoN,
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final Function<? super N, ? extends M, Void> funcNtoM)
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{
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return new TransformedCollection<M, N, Void, Collection<M>>(collection,
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funcMtoN, funcNtoM, null);
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}
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/**
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* Returns a view of {@code list} whose values have been mapped to elements of
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* type {@code N} using {@code funcMtoN}. The returned list supports all
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* operations.
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*
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* @param <M>
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* The type of elements contained in {@code list}.
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* @param <N>
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* The type of elements contained in the returned list.
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* @param <P>
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* The type of the additional parameter to the function's
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* {@code apply} method. Use {@link java.lang.Void} for functions
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* that do not need an additional parameter.
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* @param list
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* The list to be transformed.
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* @param funcMtoN
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* A function which maps values of type {@code M} to values of type
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* {@code N}. This function will be used when retrieving values from
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* {@code list}.
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* @param funcNtoM
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* A function which maps values of type {@code N} to values of type
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* {@code M}. This function will be used when performing queries and
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* adding values to {@code list} .
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* @param p
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* A predicate specified parameter.
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* @return A view of {@code list} whose values have been mapped to elements of
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* type {@code N} using {@code funcMtoN}.
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*/
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public static <M, N, P> List<N> transformedList(final List<M> list,
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final Function<? super M, ? extends N, P> funcMtoN,
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final Function<? super N, ? extends M, P> funcNtoM, final P p)
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{
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return new TransformedList<M, N, P>(list, funcMtoN, funcNtoM, p);
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}
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/**
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* Returns a view of {@code list} whose values have been mapped to elements of
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* type {@code N} using {@code funcMtoN}. The returned list supports all
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* operations.
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*
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* @param <M>
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* The type of elements contained in {@code list}.
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* @param <N>
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* The type of elements contained in the returned list.
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* @param list
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* The list to be transformed.
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* @param funcMtoN
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* A function which maps values of type {@code M} to values of type
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* {@code N}. This function will be used when retrieving values from
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* {@code list}.
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* @param funcNtoM
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* A function which maps values of type {@code N} to values of type
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* {@code M}. This function will be used when performing queries and
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* adding values to {@code list} .
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* @return A view of {@code list} whose values have been mapped to elements of
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* type {@code N} using {@code funcMtoN}.
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*/
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public static <M, N> List<N> transformedList(final List<M> list,
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final Function<? super M, ? extends N, Void> funcMtoN,
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final Function<? super N, ? extends M, Void> funcNtoM)
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{
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return new TransformedList<M, N, Void>(list, funcMtoN, funcNtoM, null);
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}
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// Prevent instantiation
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private Collections2()
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{
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// Do nothing.
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}
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}
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