/*
  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.example.logging;

import com.google.api.gax.paging.Page;
import com.google.cloud.logging.LogEntry;
import com.google.cloud.logging.Logging;
import com.google.cloud.logging.Logging.EntryListOption;
import com.google.cloud.logging.LoggingOptions;

/**
 * List logs programmatically using the StackDriver Logging API.
 */
public class ListLogs {

  /** Expects an existing Stackdriver log name as an argument. */
  public static void main(String... args) throws Exception {
    // [START listlogs]
    // Instantiates a client
    LoggingOptions options = LoggingOptions.getDefaultInstance();

    String logName = args[0];

    try (Logging logging = options.getService()) {

      String logFilter = "logName=projects/" + options.getProjectId() + "/logs/" + logName;

      // List log entries
      Page<LogEntry> entries = logging.listLogEntries(
          EntryListOption.filter(logFilter));
      for (LogEntry logEntry : entries.iterateAll()) {
        System.out.println(logEntry);
      }
      // Use entries.getNextPage() to paginate
    }
    // [END listlogs]
  }
}
