java/src/main/com/google/apphosting/base/AppId.java

   1 // Copyright 2011 Google Inc. All Rights Reserved.
   2
   3 package com.google.apphosting.base;
   4
   5 import java.util.regex.Matcher;
   6 import java.util.regex.Pattern;
   7
   8 /**
   9  * Class used for parsing the various components of the AppId.
  10  *
  11  */
  12 public class AppId {
  13   private static final int APP_ID_MAX_LEN = 100;
  14   private static final Pattern DISPLAY_APP_ID_RE =
  15       Pattern.compile("[a-z\\d\\-]{1," + APP_ID_MAX_LEN + "}", Pattern.CASE_INSENSITIVE);
  16   private static final Pattern DOMAIN_RE =
  17       Pattern.compile("([a-z\\d\\-\\.]{1," + APP_ID_MAX_LEN + "})?\\:", Pattern.CASE_INSENSITIVE);
  18   private static final Pattern PARTITION_RE =
  19       Pattern.compile("([a-z\\d\\-]{1," + APP_ID_MAX_LEN + "})?\\~", Pattern.CASE_INSENSITIVE);
  20   private static final Pattern APP_ID_RE =
  21       Pattern.compile(
  22           "(?:" + PARTITION_RE + ")?((?:" + DOMAIN_RE + ")?(" + DISPLAY_APP_ID_RE + "))",
  23           Pattern.CASE_INSENSITIVE);
  24   private String appId;
  25   private String domain;
  26   private String longAppId;
  27   private String displayAppId;
  28   private String partition;
  29
  30   /**
  31    * Create a new AppId based on an appId formatted as follows:
  32    *
  33    * [(partition)~][(domain):](display-app-id)
  34    *
  35    * @param appId The appId to parse.
  36    */
  37   private AppId(String appId) {
  38     this.appId = appId;
  39     if (appId == null || appId.length() == 0) {
  40       return;
  41     }
  42     Matcher matcher = APP_ID_RE.matcher(appId);
  43     if (!matcher.matches()) {
  44       return;
  45     }
  46     this.partition = matcher.group(1);
  47     this.longAppId = matcher.group(2);
  48     this.domain = matcher.group(3);
  49     this.displayAppId = matcher.group(4);
  50   }
  51
  52   /**
  53    * @return The full appId.
  54    */
  55   public String getAppId() {
  56     return appId;
  57   }
  58
  59   /**
  60    * @return The domain component of this appId.
  61    */
  62   public String getDomain() {
  63     return domain;
  64   }
  65
  66   /**
  67    * @return The display-app-id component of this appId.
  68    */
  69   public String getDisplayAppId() {
  70     return displayAppId;
  71   }
  72
  73   /**
  74    * @return The partition component of the appId.
  75    */
  76   public String getPartition() {
  77     return partition;
  78   }
  79
  80   /**
  81    * @return The appId without the partition component.
  82    */
  83   public String getLongAppId() {
  84     return longAppId;
  85   }
  86
  87   /**
  88    * Returns a new AppId object based on an appId formatted as follows:
  89    *
  90    * [(partition)~][(domain):](display-app-id)
  91    *
  92    * @param appId The appId to parse.
  93    *
  94    * @return AppId object with the parsed appid components.
  95    */
  96   public static AppId parse(String appId) {
  97     return new AppId(appId);
  98   }
  99
 100 }