| // Copyright 2010, 2012 The Apache Software Foundation |
| // |
| // 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 org.apache.tapestry5.func; |
| |
| import java.util.*; |
| |
| /** |
| * The single implementation of {@link ZippedFlow}, that operates by wrapping around an ordinary {@link Flow} of the |
| * {@link Tuples} of the zipped flow. In the future, we may create an |
| * EmptyZippedFlow implementation as well. |
| * |
| * @param <A> |
| * type of first value in tuple |
| * @param <B> |
| * type of second value in tuple |
| */ |
| class ZippedFlowImpl<A, B> implements ZippedFlow<A, B> |
| { |
| private final Flow<Tuple<A, B>> tupleFlow; |
| |
| private ZippedFlowImpl(Flow<Tuple<A, B>> tupleFlow) |
| { |
| this.tupleFlow = tupleFlow; |
| } |
| |
| @Override |
| public Tuple<Flow<A>, Flow<B>> unzip() |
| { |
| return Tuple.create(firsts(), seconds()); |
| } |
| |
| static <X, Y> ZippedFlow<X, Y> create(Flow<Tuple<X, Y>> wrappedTupleFlow) |
| { |
| assert wrappedTupleFlow != null; |
| |
| return new ZippedFlowImpl<X, Y>(wrappedTupleFlow); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> filter(Predicate<? super Tuple<A, B>> predicate) |
| { |
| return create(tupleFlow.filter(predicate)); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> remove(Predicate<? super Tuple<A, B>> predicate) |
| { |
| return create(tupleFlow.remove(predicate)); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> each(Worker<? super Tuple<A, B>> worker) |
| { |
| tupleFlow.each(worker); |
| |
| return this; |
| } |
| |
| @Override |
| public List<Tuple<A, B>> toList() |
| { |
| return tupleFlow.toList(); |
| } |
| |
| @Override |
| public Set<Tuple<A, B>> toSet() |
| { |
| return tupleFlow.toSet(); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> reverse() |
| { |
| return create(tupleFlow.reverse()); |
| } |
| |
| @Override |
| public boolean isEmpty() |
| { |
| return tupleFlow.isEmpty(); |
| } |
| |
| @Override |
| public Tuple<A, B> first() |
| { |
| return tupleFlow.first(); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> rest() |
| { |
| return create(tupleFlow.rest()); |
| } |
| |
| @Override |
| public int count() |
| { |
| return tupleFlow.count(); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> sort(Comparator<Tuple<A, B>> comparator) |
| { |
| return create(tupleFlow.sort(comparator)); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> take(int length) |
| { |
| return create(tupleFlow.take(length)); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> drop(int length) |
| { |
| return create(tupleFlow.drop(length)); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> concat(Collection<? extends Tuple<A, B>> collection) |
| { |
| return create(tupleFlow.concat(collection)); |
| } |
| |
| @Override |
| public Iterator<Tuple<A, B>> iterator() |
| { |
| return tupleFlow.iterator(); |
| } |
| |
| @Override |
| public <O> O reduce(Reducer<O, Tuple<A, B>> reducer, O initial) |
| { |
| return tupleFlow.reduce(reducer, initial); |
| } |
| |
| @Override |
| public <X, Y> ZippedFlow<X, Y> mapTuples(Mapper<Tuple<A, B>, Tuple<X, Y>> mapper) |
| { |
| return create(tupleFlow.map(mapper)); |
| } |
| |
| @Override |
| public Flow<A> firsts() |
| { |
| return tupleFlow.map(new Mapper<Tuple<A, B>, A>() |
| { |
| @Override |
| public A map(Tuple<A, B> value) |
| { |
| return value.first; |
| } |
| }); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> removeNulls() |
| { |
| return create(tupleFlow.removeNulls()); |
| } |
| |
| @Override |
| public Flow<B> seconds() |
| { |
| return tupleFlow.map(new Mapper<Tuple<A, B>, B>() |
| { |
| @Override |
| public B map(Tuple<A, B> value) |
| { |
| return value.second; |
| } |
| }); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> filterOnFirst(final Predicate<? super A> predicate) |
| { |
| assert predicate != null; |
| |
| return filter(new Predicate<Tuple<A, B>>() |
| { |
| @Override |
| public boolean accept(Tuple<A, B> element) |
| { |
| return predicate.accept(element.first); |
| } |
| }); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> filterOnSecond(final Predicate<? super B> predicate) |
| { |
| assert predicate != null; |
| |
| return filter(new Predicate<Tuple<A, B>>() |
| { |
| @Override |
| public boolean accept(Tuple<A, B> element) |
| { |
| return predicate.accept(element.second); |
| } |
| }); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> removeOnFirst(Predicate<? super A> predicate) |
| { |
| assert predicate != null; |
| |
| return filterOnFirst(F.not(predicate)); |
| } |
| |
| @Override |
| public ZippedFlow<A, B> removeOnSecond(Predicate<? super B> predicate) |
| { |
| assert predicate != null; |
| |
| return filterOnSecond(F.not(predicate)); |
| } |
| |
| @Override |
| public Map<A, B> toMap() |
| { |
| final Map<A, B> result = new HashMap<A, B>(); |
| |
| tupleFlow.each(new Worker<Tuple<A, B>>() |
| { |
| @Override |
| public void work(Tuple<A, B> value) |
| { |
| result.put(value.first, value.second); |
| } |
| }); |
| |
| return result; |
| } |
| } |