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## com.install4j.api
Class ApplicationRegistry

    java.lang.Object
      com.install4j.api.ApplicationRegistry

    public class ApplicationRegistry

extends java.lang.Object

The class provides information about applications installed with install4j.

Author:
  ej-technologies GmbH

Nested Class Summary
`static interface` | `ApplicationRegistry.ApplicationInfo` Provides information about an application installed by install4j.

Constructor Summary
`ApplicationRegistry()`

Method Summary
`static boolean` | `checkApplicationId(java.io.File dir)` Returns true if the application can be safely installed into the given directory.
`static ApplicationRegistry.ApplicationInfo[]` | `getAddOnApplicationInfoByDir(java.io.File dir)` Checks if the specified directory contains an application installed by install4j and retrieves information about the add-on installers in it.
`static ApplicationRegistry.ApplicationInfo` | `getApplicationInfoByDir(java.io.File dir)` Checks if the specified directory contains an application installed by install4j and retrieves information about it.
`static ApplicationRegistry.ApplicationInfo[]` | `getApplicationInfoById(java.lang.String id)` Retrieves information about an application installed by install4j via its application id.
`static boolean` | `isUpdateDirectory(java.io.File dir)` Returns true if this application is already installed in the given directory.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ApplicationRegistry

    public ApplicationRegistry()

Method Detail

### checkApplicationId

    public static boolean checkApplicationId(java.io.File dir)

  Returns true if the application can be safely installed into the given directory. If this is an add-on installer it returns true if the directory contains the target app.

  Parameters:
    `dir` - the directory to be checked
  Returns:
    true if safe

### isUpdateDirectory

    public static boolean isUpdateDirectory(java.io.File dir)

  Returns true if this application is already installed in the given directory.

  Parameters:
    `dir` - the directory to be checked
  Returns:
    true if update

### getApplicationInfoById

    public static ApplicationRegistry.ApplicationInfo[] getApplicationInfoById(java.lang.String id)

  Retrieves information about an application installed by install4j via its application id.

  Parameters:
    `id` - the application id
  Returns:
    an array of ApplicationInfo objects containing all installations of the application with this id. The newest installation is the first element. Empty array if there are no installations.

### getApplicationInfoByDir

    public static ApplicationRegistry.ApplicationInfo getApplicationInfoByDir(java.io.File dir)

  Checks if the specified directory contains an application installed by install4j and retrieves information about it.

  Parameters:
    `dir` - the base directory to check
  Returns:
    an ApplicationInfo object if the directory contains an application installed with install4j, `null` otherwise.

### getAddOnApplicationInfoByDir

    public static ApplicationRegistry.ApplicationInfo[] getAddOnApplicationInfoByDir(java.io.File dir)

  Checks if the specified directory contains an application installed by install4j and retrieves information about the add-on installers in it.

  Parameters:
    `dir` - the base directory to check
  Returns:
    an array of ApplicationInfo objects if the directory contains an application installed with install4j, `null` otherwise. The array will be empty if there are no add-ons installed.

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