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/*
* Copyright 2000-2013 JetBrains s.r.o.
*
* 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 com.intellij.util.containers;
import com.intellij.openapi.util.Condition;
import java.util.Collection;
import java.util.Map;
/**
* User: lex
* Date: Sep 25, 2003
* Time: 12:16:58 AM
*/
public interface InternalIterator<T>{
/**
* @param element
* @return false to stop iteration true to continue if more elements are avaliable.
*/
boolean visit(T element);
class Collector<T> implements InternalIterator<T> {
private final Collection<T> myCollection;
public Collector(Collection<T> collection) {
myCollection = collection;
}
@Override
public boolean visit(T value) {
return myCollection.add(value);
}
public static <T> InternalIterator<T> create(Collection<T> collection) {
return new Collector<T>(collection);
}
}
class MapFromValues<K, Dom, V extends Dom> implements InternalIterator<V> {
private final Map<K, V> myMap;
private final Convertor<Dom, K> myToKeyConvertor;
public MapFromValues(Map<K, V> map, Convertor<Dom, K> toKeyConvertor) {
myMap = map;
myToKeyConvertor = toKeyConvertor;
}
@Override
public boolean visit(V value) {
myMap.put(myToKeyConvertor.convert(value), value);
return true;
}
public static <Dom, K, V extends Dom> InternalIterator<V> create(Convertor<Dom, K> toKey, Map<K, V> map) {
return new MapFromValues<K, Dom, V>(map, toKey);
}
}
class Filtering<T> implements InternalIterator<T> {
private final Condition<? super T> myFilter;
private final InternalIterator<T> myIterator;
public Filtering(InternalIterator<T> iterator, Condition<? super T> filter) {
myIterator = iterator;
myFilter = filter;
}
@Override
public boolean visit(T value) {
return !myFilter.value(value) || myIterator.visit(value);
}
public static <T> InternalIterator<T> create(InternalIterator<T> iterator, Condition<T> filter) {
return new Filtering<T>(iterator, filter);
}
public static <T, V extends T> InternalIterator<T> createInstanceOf(InternalIterator<V> iterator, FilteringIterator.InstanceOf<V> filter) {
return new Filtering<T>((InternalIterator<T>)iterator, filter);
}
public static <T> InternalIterator createInstanceOf(InternalIterator<T> iterator, Class<T> aClass) {
return createInstanceOf(iterator, FilteringIterator.instanceOf(aClass));
}
}
class Converting<Dom, Rng> implements InternalIterator<Dom> {
private final Convertor<Dom, Rng> myConvertor;
private final InternalIterator<Rng> myIterator;
public Converting(InternalIterator<Rng> iterator, Convertor<Dom, Rng> convertor) {
myIterator = iterator;
myConvertor = convertor;
}
@Override
public boolean visit(Dom element) {
return myIterator.visit(myConvertor.convert(element));
}
public static <Dom, Rng> InternalIterator<Dom> create(Convertor<Dom, Rng> convertor, InternalIterator<Rng> iterator) {
return new Converting<Dom, Rng>(iterator, convertor);
}
}
}
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