Copyright (c) 2016-present, RxJava Contributors.
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.
/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * 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 io.reactivex.internal.disposables;

import java.util.*;

import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.*;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.util.ExceptionHelper;

A disposable container that can hold onto multiple other disposables.
/**
 * A disposable container that can hold onto multiple other disposables.
 */
public final class ListCompositeDisposable implements Disposable, DisposableContainer {

    List<Disposable> resources;

    volatile boolean disposed;

    public ListCompositeDisposable() {
    }

    public ListCompositeDisposable(Disposable... resources) {
        ObjectHelper.requireNonNull(resources, "resources is null");
        this.resources = new LinkedList<Disposable>();
        for (Disposable d : resources) {
            ObjectHelper.requireNonNull(d, "Disposable item is null");
            this.resources.add(d);
        }
    }

    public ListCompositeDisposable(Iterable<? extends Disposable> resources) {
        ObjectHelper.requireNonNull(resources, "resources is null");
        this.resources = new LinkedList<Disposable>();
        for (Disposable d : resources) {
            ObjectHelper.requireNonNull(d, "Disposable item is null");
            this.resources.add(d);
        }
    }

    @Override
    public void dispose() {
        if (disposed) {
            return;
        }
        List<Disposable> set;
        synchronized (this) {
            if (disposed) {
                return;
            }
            disposed = true;
            set = resources;
            resources = null;
        }

        dispose(set);
    }

    @Override
    public boolean isDisposed() {
        return disposed;
    }

    @Override
    public boolean add(Disposable d) {
        ObjectHelper.requireNonNull(d, "d is null");
        if (!disposed) {
            synchronized (this) {
                if (!disposed) {
                    List<Disposable> set = resources;
                    if (set == null) {
                        set = new LinkedList<Disposable>();
                        resources = set;
                    }
                    set.add(d);
                    return true;
                }
            }
        }
        d.dispose();
        return false;
    }

    public boolean addAll(Disposable... ds) {
        ObjectHelper.requireNonNull(ds, "ds is null");
        if (!disposed) {
            synchronized (this) {
                if (!disposed) {
                    List<Disposable> set = resources;
                    if (set == null) {
                        set = new LinkedList<Disposable>();
                        resources = set;
                    }
                    for (Disposable d : ds) {
                        ObjectHelper.requireNonNull(d, "d is null");
                        set.add(d);
                    }
                    return true;
                }
            }
        }
        for (Disposable d : ds) {
            d.dispose();
        }
        return false;
    }

    @Override
    public boolean remove(Disposable d) {
        if (delete(d)) {
            d.dispose();
            return true;
        }
        return false;
    }

    @Override
    public boolean delete(Disposable d) {
        ObjectHelper.requireNonNull(d, "Disposable item is null");
        if (disposed) {
            return false;
        }
        synchronized (this) {
            if (disposed) {
                return false;
            }

            List<Disposable> set = resources;
            if (set == null || !set.remove(d)) {
                return false;
            }
        }
        return true;
    }

    public void clear() {
        if (disposed) {
            return;
        }
        List<Disposable> set;
        synchronized (this) {
            if (disposed) {
                return;
            }

            set = resources;
            resources = null;
        }

        dispose(set);
    }

    void dispose(List<Disposable> set) {
        if (set == null) {
            return;
        }
        List<Throwable> errors = null;
        for (Disposable o : set) {
            try {
                o.dispose();
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                if (errors == null) {
                    errors = new ArrayList<Throwable>();
                }
                errors.add(ex);
            }
        }
        if (errors != null) {
            if (errors.size() == 1) {
                throw ExceptionHelper.wrapOrThrow(errors.get(0));
            }
            throw new CompositeException(errors);
        }
    }
}