/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.maven.model.interpolation;
  
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.GregorianCalendar;
  import java.util.Properties;
  import java.util.TimeZone;
  
  /**
   * MavenBuildTimestamp
   */
  public class MavenBuildTimestamp {
      // ISO 8601-compliant timestamp for machine readability
      public static final String DEFAULT_BUILD_TIMESTAMP_FORMAT = "yyyy-MM-dd'T'HH:mm:ss'Z'";
  
      public static final String BUILD_TIMESTAMP_FORMAT_PROPERTY = "maven.build.timestamp.format";
  
      public static final TimeZone DEFAULT_BUILD_TIME_ZONE = TimeZone.getTimeZone("Etc/UTC");
  
      private String formattedTimestamp;
  
      public MavenBuildTimestamp() {
          this(new Date());
      }
  
      public MavenBuildTimestamp(Date time) {
          this(time, DEFAULT_BUILD_TIMESTAMP_FORMAT);
      }
  
      public MavenBuildTimestamp(Date time, Properties properties) {
          this(time, properties != null ? properties.getProperty(BUILD_TIMESTAMP_FORMAT_PROPERTY) : null);
      }
  
      public MavenBuildTimestamp(Date time, String timestampFormat) {
          if (timestampFormat == null) {
              timestampFormat = DEFAULT_BUILD_TIMESTAMP_FORMAT;
          }
          if (time == null) {
              time = new Date();
          }
          SimpleDateFormat dateFormat = new SimpleDateFormat(timestampFormat);
          dateFormat.setCalendar(new GregorianCalendar());
          dateFormat.setTimeZone(DEFAULT_BUILD_TIME_ZONE);
          formattedTimestamp = dateFormat.format(time);
      }
  
      public String formattedTimestamp() {
          return formattedTimestamp;
      }
  }