/*
* Copyright 2009 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;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.gradle.api.Action;
import org.gradle.api.DomainObjectCollection;
import org.gradle.api.specs.Spec;
import org.gradle.internal.Actions;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
/**
* A domain object collection that presents a combined view of one or more collections.
*
* @param <T> The type of domain objects in the component collections of this collection.
*/
public class CompositeDomainObjectSet<T> extends DelegatingDomainObjectSet<T> implements WithEstimatedSize {
private final Spec<T> uniqueSpec = new ItemIsUniqueInCompositeSpec();
private final Spec<T> notInSpec = new ItemNotInCompositeSpec();
private final DefaultDomainObjectSet<T> backingSet;
public static <T> CompositeDomainObjectSet<T> create(Class<T> type, DomainObjectCollection<? extends T>... collections) {
//noinspection unchecked
DefaultDomainObjectSet<T> backingSet = new DefaultDomainObjectSet<T>(type, new DomainObjectCompositeCollection());
CompositeDomainObjectSet<T> out = new CompositeDomainObjectSet<T>(backingSet);
for (DomainObjectCollection<? extends T> c : collections) {
out.addCollection(c);
}
return out;
}
CompositeDomainObjectSet(DefaultDomainObjectSet<T> backingSet) {
super(backingSet);
this.backingSet = backingSet; //TODO SF try avoiding keeping this state here
}
public class ItemIsUniqueInCompositeSpec implements Spec<T> {
public boolean isSatisfiedBy(T element) {
int matches = 0;
for (Object collection : getStore().store) {
if (((Collection) collection).contains(element)) {
if (++matches > 1) {
return false;
}
}
}
return true;
}
}
public class ItemNotInCompositeSpec implements Spec<T> {
public boolean isSatisfiedBy(T element) {
return !getStore().contains(element);
}
}
@SuppressWarnings("unchecked")
protected DomainObjectCompositeCollection getStore() {
return (DomainObjectCompositeCollection) this.backingSet.getStore();
}
public Action<? super T> whenObjectAdded(Action<? super T> action) {
return super.whenObjectAdded(Actions.filter(action, uniqueSpec));
}
public Action<? super T> whenObjectRemoved(Action<? super T> action) {
return super.whenObjectRemoved(Actions.filter(action, notInSpec));
}
public void addCollection(DomainObjectCollection<? extends T> collection) {
if (!getStore().containsCollection(collection)) {
getStore().addComposited(collection);
collection.all(backingSet.getEventRegister().getAddAction());
collection.whenObjectRemoved(backingSet.getEventRegister().getRemoveAction());
}
}
public void removeCollection(DomainObjectCollection<? extends T> collection) {
getStore().removeComposited(collection);
Action<? super T> action = this.backingSet.getEventRegister().getRemoveAction();
for (T item : collection) {
action.execute(item);
}
}
@SuppressWarnings({"NullableProblems", "unchecked"})
@Override
public Iterator<T> iterator() {
DomainObjectCompositeCollection store = getStore();
if (store.isEmpty()) {
return Iterators.emptyIterator();
}
return SetIterator.of(store);
}
@SuppressWarnings("unchecked")
/**
* This method is expensive. Avoid calling it if possible. If all you need is a rough
* estimate, call {@link #estimatedSize()} instead.
*/
public int size() {
DomainObjectCompositeCollection store = getStore();
if (store.isEmpty()) {
return 0;
}
Set<T> tmp = Sets.newHashSetWithExpectedSize(estimatedSize());
tmp.addAll(store);
return tmp.size();
}
@Override
public int estimatedSize() {
return getStore().estimatedSize();
}
public void all(Action<? super T> action) {
//calling overloaded method with extra behavior:
whenObjectAdded(action);
for (T t : this) {
action.execute(t);
}
}
private final static class DomainObjectCompositeCollection<T> implements Collection<T>, WithEstimatedSize {
private final List<DomainObjectCollection<? extends T>> store = Lists.newLinkedList();
public boolean containsCollection(DomainObjectCollection<? extends T> collection) {
for (DomainObjectCollection<? extends T> ts : store) {
if (ts == collection) {
return true;
}
}
return false;
}
@Override
public int size() {
int size = 0;
for (DomainObjectCollection<? extends T> ts : store) {
size += ts.size();
}
return size;
}
@Override
public boolean isEmpty() {
for (DomainObjectCollection<? extends T> ts : store) {
if (!ts.isEmpty()) {
return false;
}
}
return true;
}
@Override
public boolean contains(Object o) {
for (DomainObjectCollection<? extends T> ts : store) {
if (ts.contains(o)) {
return true;
}
}
return false;
}
@Override
@SuppressWarnings("unchecked")
public Iterator<T> iterator() {
if (store.isEmpty()) {
return Iterators.emptyIterator();
}
if (store.size() == 1) {
return (Iterator<T>) store.get(0).iterator();
}
Iterator[] iterators = new Iterator[store.size()];
int i=0;
for (DomainObjectCollection<? extends T> ts : store) {
iterators[i++] = ts.iterator();
}
return Iterators.<T>concat(iterators);
}
@Override
public Object[] toArray() {
throw new UnsupportedOperationException();
}
@Override
public <V> V[] toArray(V[] a) {
throw new UnsupportedOperationException();
}
@Override
public boolean add(T t) {
throw new UnsupportedOperationException();
}
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
@Override
public boolean containsAll(Collection<?> c) {
throw new UnsupportedOperationException();
}
@Override
public boolean addAll(Collection<? extends T> c) {
throw new UnsupportedOperationException();
}
@Override
public boolean removeAll(Collection<?> c) {
throw new UnsupportedOperationException();
}
@Override
public boolean retainAll(Collection<?> c) {
throw new UnsupportedOperationException();
}
@Override
public void clear() {
throw new UnsupportedOperationException();
}
public void addComposited(DomainObjectCollection<? extends T> collection) {
this.store.add(collection);
}
public void removeComposited(DomainObjectCollection<? extends T> collection) {
Iterator<DomainObjectCollection<? extends T>> iterator = store.iterator();
while (iterator.hasNext()) {
DomainObjectCollection<? extends T> next = iterator.next();
if (next == collection) {
iterator.remove();
break;
}
}
}
@Override
public int estimatedSize() {
int size = 0;
for (DomainObjectCollection<? extends T> ts : store) {
size += Estimates.estimateSizeOf(ts);
}
return size;
}
}
}