com.google.firebase.database.snapshot.PriorityIndex Maven / Gradle / Ivy

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.snapshot;

public class PriorityIndex extends Index {

  private static final PriorityIndex INSTANCE = new PriorityIndex();

  private PriorityIndex() {
    // prevent creation
  }

  public static PriorityIndex getInstance() {
    return INSTANCE;
  }

  @Override
  public int compare(NamedNode node1, NamedNode node2) {
    Node priority1 = node1.getNode().getPriority();
    Node priority2 = node2.getNode().getPriority();
    return NodeUtilities.nameAndPriorityCompare(
        node1.getName(), priority1, node2.getName(), priority2);
  }

  @Override
  public boolean isDefinedOn(Node a) {
    return !a.getPriority().isEmpty();
  }

  @Override
  public NamedNode makePost(ChildKey name, Node value) {
    return new NamedNode(name, new StringNode("[PRIORITY-POST]", value));
  }

  @Override
  public NamedNode maxPost() {
    return makePost(ChildKey.getMaxName(), Node.MAX_NODE);
  }

  @Override
  public String getQueryDefinition() {
    throw new IllegalArgumentException("Can't get query definition on priority index!");
  }

  @Override
  public boolean equals(Object o) {
    return o instanceof PriorityIndex;
  }

  @Override
  public int hashCode() {
    // chosen by a fair dice roll. Guaranteed to be random
    return 3155577;
  }

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