ServerValue.java

/*
 * 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;

// Server values

import com.google.firebase.database.core.ServerValues;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/** Contains placeholder values to use when writing data to the Firebase Database. */
public class ServerValue {

  /**
   * A placeholder value for auto-populating the current timestamp (time since the Unix epoch, in
   * milliseconds) by the Firebase Database servers.
   */
  public static final Map<String, String> TIMESTAMP = createServerValuePlaceholder("timestamp");

  private static Map<String, String> createServerValuePlaceholder(String key) {
    Map<String, String> result = new HashMap<>();
    result.put(ServerValues.NAME_SUBKEY_SERVERVALUE, key);
    return Collections.unmodifiableMap(result);
  }
}