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Gradle 5.5.1 API redistribution.
/*
* Copyright 2011 the original author or authors.
*
* 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.gradle.api.internal.collections;
import org.gradle.api.Action;
import org.gradle.api.internal.MutationGuard;
import org.gradle.api.internal.WithEstimatedSize;
import org.gradle.api.internal.provider.CollectionProviderInternal;
import org.gradle.api.internal.provider.ProviderInternal;
import org.gradle.internal.Cast;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
public class FilteredCollection implements ElementSource {
protected final ElementSource collection;
protected final CollectionFilter filter;
public FilteredCollection(ElementSource collection, CollectionFilter filter) {
this.collection = collection;
this.filter = filter;
}
@Override
public boolean add(S o) {
throw new UnsupportedOperationException(String.format("Cannot add '%s' to '%s' as it is a filtered collection", o, this));
}
@Override
public boolean addRealized(S o) {
throw new UnsupportedOperationException(String.format("Cannot add '%s' to '%s' as it is a filtered collection", o, this));
}
@Override
public void clear() {
throw new UnsupportedOperationException(String.format("Cannot clear '%s' as it is a filtered collection", this));
}
protected boolean accept(Object o) {
return filter.filter(o) != null;
}
@Override
public boolean contains(Object o) {
return collection.contains(o) && accept(o);
}
@Override
public boolean containsAll(Collection c) {
if (collection.containsAll(c)) {
for (Object o : c) {
if (!accept(o)) {
return false;
}
}
return true;
} else {
return false;
}
}
@Override
public boolean constantTimeIsEmpty() {
return collection.constantTimeIsEmpty();
}
@Override
public boolean isEmpty() {
if (collection.isEmpty()) {
return true;
} else {
for (T o : this) {
if (accept(o)) {
return false;
}
}
return true;
}
}
@Override
public int estimatedSize() {
return collection.estimatedSize();
}
@Override
public MutationGuard getMutationGuard() {
return collection.getMutationGuard();
}
private static class FilteringIterator implements Iterator, WithEstimatedSize {
private final CollectionFilter filter;
private final Iterator iterator;
private final int estimatedSize;
private S next;
FilteringIterator(ElementSource collection, CollectionFilter filter) {
this.iterator = collection.iteratorNoFlush();
this.filter = filter;
this.estimatedSize = collection.estimatedSize();
this.next = findNext();
}
private S findNext() {
while (iterator.hasNext()) {
T potentialNext = iterator.next();
S filtered = filter.filter(potentialNext);
if (filtered != null) {
return filtered;
}
}
return null;
}
@Override
public boolean hasNext() {
return next != null;
}
@Override
public S next() {
if (next != null) {
S thisNext = next;
next = findNext();
return thisNext;
} else {
throw new NoSuchElementException();
}
}
@Override
public void remove() {
throw new UnsupportedOperationException("This iterator does not support removal");
}
@Override
public int estimatedSize() {
return estimatedSize;
}
}
@Override
public Iterator iterator() {
collection.realizePending(filter.getType());
return new FilteringIterator(collection, filter);
}
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException(String.format("Cannot remove '%s' from '%s' as it is a filtered collection", o, this));
}
@Override
public int size() {
int i = 0;
// NOTE: There isn't much we can do about collection.matching { } filters as the spec requires a realized element, unless make major changes
for (T o : this) {
if (accept(o)) {
++i;
}
}
return i;
}
@Override
public Iterator iteratorNoFlush() {
return new FilteringIterator(collection, filter);
}
@Override
public void realizePending() {
realizePending(filter.getType());
}
@Override
public void realizePending(Class type) {
collection.realizePending(type);
}
@Override
public boolean addPending(ProviderInternal provider) {
return collection.addPending(provider);
}
@Override
public boolean removePending(ProviderInternal provider) {
return collection.removePending(provider);
}
@Override
public boolean addPendingCollection(CollectionProviderInternal> provider) {
CollectionProviderInternal> providerOfT = Cast.uncheckedCast(provider);
return collection.addPendingCollection(providerOfT);
}
@Override
public boolean removePendingCollection(CollectionProviderInternal> provider) {
CollectionProviderInternal> providerOfT = Cast.uncheckedCast(provider);
return collection.removePendingCollection(providerOfT);
}
@Override
public void onRealize(Action action) { }
@Override
public void realizeExternal(ProviderInternal provider) {
collection.realizeExternal(provider);
}
}