com.google.firebase.database.snapshot.ChildKey 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.

There is a newer version: 9.2.0

Show 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;

import com.google.firebase.database.utilities.Utilities;

public class ChildKey implements Comparable {

  private static final ChildKey MIN_KEY = new ChildKey("[MIN_KEY]");
  private static final ChildKey MAX_KEY = new ChildKey("[MAX_KEY]");
  // Singleton for priority child keys
  private static final ChildKey PRIORITY_CHILD_KEY = new ChildKey(".priority");
  private static final ChildKey INFO_CHILD_KEY = new ChildKey(".info");
  private final String key;

  private ChildKey(String key) {
    this.key = key;
  }

  public static ChildKey getMinName() {
    return MIN_KEY;
  }

  public static ChildKey getMaxName() {
    return MAX_KEY;
  }

  public static ChildKey getPriorityKey() {
    return PRIORITY_CHILD_KEY;
  }

  public static ChildKey getInfoKey() {
    return INFO_CHILD_KEY;
  }

  public static ChildKey fromString(String key) {
    Integer intValue = Utilities.tryParseInt(key);
    if (intValue != null) {
      return new IntegerChildKey(key, intValue);
    } else if (key.equals(".priority")) {
      return PRIORITY_CHILD_KEY;
    } else {
      assert !key.contains("/");
      return new ChildKey(key);
    }
  }

  public String asString() {
    return this.key;
  }

  public boolean isPriorityChildName() {
    return this == PRIORITY_CHILD_KEY;
  }

  protected boolean isInt() {
    return false;
  }

  protected int intValue() {
    return 0;
  }

  @Override
  public int compareTo(ChildKey other) {
    if (this == other) {
      return 0;
    } else if (this == MIN_KEY || other == MAX_KEY) {
      return -1;
    } else if (other == MIN_KEY || this == MAX_KEY) {
      return 1;
    } else if (this.isInt()) {
      if (other.isInt()) {
        int cmp = Utilities.compareInts(this.intValue(), other.intValue());
        return cmp == 0 ? Utilities.compareInts(this.key.length(), other.key.length()) : cmp;
      } else {
        return -1;
      }
    } else if (other.isInt()) {
      return 1;
    } else {
      return this.key.compareTo(other.key);
    }
  }

  @Override
  public String toString() {
    return "ChildKey(\"" + this.key + "\")";
  }

  @Override
  public int hashCode() {
    return this.key.hashCode();
  }

  @Override
  public boolean equals(Object obj) {
    if (!(obj instanceof ChildKey)) {
      return false;
    }
    if (this == obj) {
      return true;
    }
    ChildKey other = (ChildKey) obj;
    return this.key.equals(other.key);
  }

  private static class IntegerChildKey extends ChildKey {

    private final int intValue;

    IntegerChildKey(String name, int intValue) {
      super(name);
      this.intValue = intValue;
    }

    @Override
    protected boolean isInt() {
      return true;
    }

    @Override
    protected int intValue() {
      return this.intValue;
    }

    @Override
    public String toString() {
      return "IntegerChildName(\"" + super.key + "\")";
    }
  }
}