com.google.firebase.database.core.ChildEventRegistration Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of firebase-admin Show documentation
This is the official Firebase Admin Java SDK. Build extraordinary native JVM apps in minutes with Firebase. The Firebase platform can power your app’s backend, user authentication, static hosting, and more.
The newest version!
/*
 * Copyright 2017 Google Inc.
 *
 * 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 com.google.firebase.database.core;

import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.InternalHelpers;
import com.google.firebase.database.annotations.NotNull;
import com.google.firebase.database.core.view.Change;
import com.google.firebase.database.core.view.DataEvent;
import com.google.firebase.database.core.view.Event;
import com.google.firebase.database.core.view.QuerySpec;

public class ChildEventRegistration extends EventRegistration {

  private final Repo repo;
  private final ChildEventListener eventListener;
  private final QuerySpec spec;

  public ChildEventRegistration(
      @NotNull Repo repo, @NotNull ChildEventListener eventListener, @NotNull QuerySpec spec) {
    this.repo = repo;
    this.eventListener = eventListener;
    this.spec = spec;
  }

  @Override
  public boolean respondsTo(Event.EventType eventType) {
    return eventType != Event.EventType.VALUE;
  }

  @Override
  public boolean equals(Object other) {
    return other instanceof ChildEventRegistration
        && ((ChildEventRegistration) other).eventListener.equals(eventListener)
        && ((ChildEventRegistration) other).repo.equals(repo)
        && ((ChildEventRegistration) other).spec.equals(spec);
  }

  @Override
  public int hashCode() {
    int result = this.eventListener.hashCode();
    result = 31 * result + this.repo.hashCode();
    result = 31 * result + this.spec.hashCode();
    return result;
  }

  @Override
  public DataEvent createEvent(Change change, QuerySpec query) {
    DatabaseReference ref =
        InternalHelpers.createReference(repo, query.getPath().child(change.getChildKey()));

    DataSnapshot snapshot = InternalHelpers.createDataSnapshot(ref, change.getIndexedNode());
    String prevName = change.getPrevName() != null ? change.getPrevName().asString() : null;
    return new DataEvent(change.getEventType(), this, snapshot, prevName);
  }

  @Override
  public void fireEvent(final DataEvent eventData) {
    if (isZombied()) {
      return;
    }
    switch (eventData.getEventType()) {
      case CHILD_ADDED:
        eventListener.onChildAdded(eventData.getSnapshot(), eventData.getPreviousName());
        break;
      case CHILD_CHANGED:
        eventListener.onChildChanged(eventData.getSnapshot(), eventData.getPreviousName());
        break;
      case CHILD_MOVED:
        eventListener.onChildMoved(eventData.getSnapshot(), eventData.getPreviousName());
        break;
      case CHILD_REMOVED:
        eventListener.onChildRemoved(eventData.getSnapshot());
        break;
      default:
        // Shouldn't ever happen. No-op
    }
  }

  @Override
  public void fireCancelEvent(final DatabaseError error) {
    eventListener.onCancelled(error);
  }

  @Override
  public EventRegistration clone(QuerySpec newQuery) {
    return new ChildEventRegistration(this.repo, this.eventListener, newQuery);
  }

  @Override
  public boolean isSameListener(EventRegistration other) {
    return (other instanceof ChildEventRegistration)
        && ((ChildEventRegistration) other).eventListener.equals(eventListener);
  }

  @NotNull
  @Override
  public QuerySpec getQuerySpec() {
    return spec;
  }

  @Override
  public String toString() {
    return "ChildEventRegistration";
  }

  @Override
  Repo getRepo() {
    return repo;
  }
}