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/*
 * Copyright 2015 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.tasks;

import groovy.lang.Closure;
import org.gradle.api.*;
import org.gradle.api.specs.Spec;
import org.gradle.api.tasks.TaskCollection;
import org.gradle.model.internal.core.ModelNode;
import org.gradle.model.internal.core.MutableModelNode;
import org.gradle.model.internal.type.ModelType;

import java.util.*;
import java.util.concurrent.atomic.AtomicBoolean;

public class RealizableTaskCollection implements TaskCollection, Iterable {

    private final TaskCollection delegate;
    private final Class type;
    private final AtomicBoolean realized = new AtomicBoolean(false);
    private final MutableModelNode modelNode;

    public RealizableTaskCollection(Class type, TaskCollection delegate, MutableModelNode modelNode) {
        assert !(delegate instanceof RealizableTaskCollection) : "Attempt to wrap already realizable task collection in realizable wrapper: " + delegate;

        this.delegate = delegate;
        this.type = type;
        this.modelNode = modelNode;
    }

    public void realizeRuleTaskTypes() {
        // Task dependencies may be calculated more than once.
        // This guard is purely an optimisation.
        if (realized.compareAndSet(false, true)) {
            modelNode.ensureAtLeast(ModelNode.State.SelfClosed);
            for (MutableModelNode node : modelNode.getLinks(ModelType.of(type))) {
                node.ensureAtLeast(ModelNode.State.GraphClosed);
            }
        }
    }

    private  RealizableTaskCollection realizable(Class type, TaskCollection collection) {
        return new RealizableTaskCollection(type, collection, modelNode);
    }

    @Override
    public TaskCollection matching(Spec spec) {
        return realizable(type, delegate.matching(spec));
    }

    @Override
    public TaskCollection matching(Closure closure) {
        return realizable(type, delegate.matching(closure));
    }

    @Override
    public T getByName(String name, Closure configureClosure) throws UnknownTaskException {
        return delegate.getByName(name, configureClosure);
    }

    @Override
    public T getByName(String name, Action configureAction) throws UnknownTaskException {
        return delegate.getByName(name, configureAction);
    }

    @Override
    public T getByName(String name) throws UnknownTaskException {
        return delegate.getByName(name);
    }

    @Override
    public  TaskCollection withType(Class type) {
        return realizable(type, delegate.withType(type));
    }

    @Override
    public Action whenTaskAdded(Action action) {
        return delegate.whenTaskAdded(action);
    }

    @Override
    public void whenTaskAdded(Closure closure) {
        delegate.whenTaskAdded(closure);
    }

    @Override
    public T getAt(String name) throws UnknownTaskException {
        return delegate.getAt(name);
    }

    @Override
    public Set findAll(Closure spec) {
        return delegate.findAll(spec);
    }

    @Override
    public boolean add(T e) {
        return delegate.add(e);
    }

    @Override
    public boolean addAll(Collection c) {
        return delegate.addAll(c);
    }

    @Override
    public Namer getNamer() {
        return delegate.getNamer();
    }

    @Override
    public SortedMap getAsMap() {
        return delegate.getAsMap();
    }

    @Override
    public SortedSet getNames() {
        return delegate.getNames();
    }

    @Override
    public T findByName(String name) {
        return delegate.findByName(name);
    }

    @Override
    public Rule addRule(Rule rule) {
        return delegate.addRule(rule);
    }

    @Override
    public Rule addRule(String description, Closure ruleAction) {
        return delegate.addRule(description, ruleAction);
    }

    @Override
    public List getRules() {
        return delegate.getRules();
    }

    @Override
    public  DomainObjectCollection withType(Class type, Action configureAction) {
        return realizable(type, (DefaultTaskCollection) delegate.withType(type, configureAction));
    }

    @Override
    public  DomainObjectCollection withType(Class type, Closure configureClosure) {
        return realizable(type, (DefaultTaskCollection) delegate.withType(type, configureClosure));
    }

    @Override
    public Action whenObjectAdded(Action action) {
        return delegate.whenObjectAdded(action);
    }

    @Override
    public void whenObjectAdded(Closure action) {
        delegate.whenObjectAdded(action);
    }

    @Override
    public Action whenObjectRemoved(Action action) {
        return delegate.whenObjectRemoved(action);
    }

    @Override
    public void whenObjectRemoved(Closure action) {
        delegate.whenObjectRemoved(action);
    }

    @Override
    public void all(Action action) {
        delegate.all(action);
    }

    @Override
    public void all(Closure action) {
        delegate.all(action);
    }

    @Override
    public int size() {
        return delegate.size();
    }

    @Override
    public boolean isEmpty() {
        return delegate.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return delegate.contains(o);
    }

    @Override
    public Iterator iterator() {
        return delegate.iterator();
    }

    @Override
    public Object[] toArray() {
        return delegate.toArray();
    }

    @Override
    public  R[] toArray(R[] a) {
        return delegate.toArray(a);
    }

    @Override
    public boolean remove(Object o) {
        return delegate.remove(o);
    }

    @Override
    public boolean containsAll(Collection c) {
        return delegate.containsAll(c);
    }

    @Override
    public boolean removeAll(Collection c) {
        return delegate.removeAll(c);
    }

    @Override
    public boolean retainAll(Collection c) {
        return delegate.retainAll(c);
    }

    @Override
    public void clear() {
        delegate.clear();
    }
}