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Copy pathIxToMap.java
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76 lines (56 loc) · 2.29 KB
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/*
* Copyright 2011-2016 David Karnok
*
* 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 ix;
import java.util.*;
final class IxToMap<T, K, V> extends IxSource<T, Map<K, V>> {
final IxFunction<? super T, ? extends K> keySelector;
final IxFunction<? super T, ? extends V> valueSelector;
IxToMap(Iterable<T> source, IxFunction<? super T, ? extends K> keySelector, IxFunction<? super T, ? extends V> valueSelector) {
super(source);
this.keySelector = keySelector;
this.valueSelector = valueSelector;
}
@Override
public Iterator<Map<K, V>> iterator() {
return new ToMapIterator<T, K, V>(source.iterator(), keySelector, valueSelector);
}
static final class ToMapIterator<T, K, V> extends IxSourceIterator<T, Map<K, V>> {
final IxFunction<? super T, ? extends K> keySelector;
final IxFunction<? super T, ? extends V> valueSelector;
ToMapIterator(Iterator<T> it, IxFunction<? super T, ? extends K> keySelector, IxFunction<? super T, ? extends V> valueSelector) {
super(it);
this.keySelector = keySelector;
this.valueSelector = valueSelector;
}
@Override
protected boolean moveNext() {
Iterator<T> it = this.it;
IxFunction<? super T, ? extends K> keySelector = this.keySelector;
IxFunction<? super T, ? extends V> valueSelector = this.valueSelector;
Map<K, V> result = new HashMap<K, V>();
while (it.hasNext()) {
T t = it.next();
K k = keySelector.apply(t);
V v = valueSelector.apply(t);
result.put(k, v);
}
value = result;
hasValue = true;
done = true;
return true;
}
}
}