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## oracle.portal.provider.v2.preference
Class PreferenceStore

    java.lang.Object
      |
      +--oracle.portal.provider.v2.preference.PreferenceStore

All Implemented Interfaces:
  Validateable

Direct Known Subclasses:
  DBPreferenceStore, FilePreferenceStore

public abstract class PreferenceStore
extends java.lang.Object
implements Validateable

A `PreferenceStore` is a generic storage mechanism for loading and saving data items held in `PreferenceDataObject`s. Data is stored under a 'key' represented by a `Preference` whose primary components are a 'reference path' and a 'preference type'. See the `Preference` class for more details.

Note that a reference path, as returned by `Preference.getReferencePath()`, is a standard Java unicode String, and as such may contain multibyte characters. Implementations of `PreferenceStore` may therefore have to encode the String into a format more suitable for the underlying storage mechanism.

Field Summary
`static java.lang.String` | `DEFAULT_CUSTOMIZATION_TYPE` Path type used for storing system default and locale default level portlet customizations.
`static char` | `PATH_SEPARATOR_CHAR` The character used betwen path components in reference paths.
`static java.lang.String` | `PATH_SEPARATOR_STRING` String containing the single character used betwen path components in reference paths.
`static java.lang.String` | `USER_CUSTOMIZATION_TYPE` Path type used for storing user level portlet customizations.

Constructor Summary
`PreferenceStore()`

Method Summary
`void` | `copy(Preference sourcePref, Preference destPref, boolean overwrite)` Copies the data persisted for the given source `Preference` to the given destination `Preference`.
`void` | `copy(java.lang.String sourceContext, java.lang.String destContext, boolean overwrite)` Copies the data from all the `Preference` objects in this `PreferenceStore` with the given source context path to the given destination context path.
`void` | `copy(java.lang.String sourceContext, java.lang.String destContext, boolean overwrite, java.util.List preferenceTypes)` Copies the data from all the `Preference` objects in this `PreferenceStore` with the given source context path and one of the given preference types to the given destination context path.
`abstract void` | `destroy(Preference pref)` Destroys the data persisted for the given `Preference`.
`void` | `destroy(java.lang.String context)` Destroys all of the `Preference` objects in this `PreferenceStore` stored under the given context path.
`abstract void` | `destroy(java.lang.String context, java.util.List preferenceTypes)` Destroys all of the `Preference` objects in this `PreferenceStore` stored under the given context path with one of the given preference types.
`abstract boolean` | `exists(Preference pref)` Returns `true` if persisted data exists for the given `Preference`.
`abstract java.io.InputStream` | `getInputStream(Preference pref)` Gets an `InputStream` for reading the data of the given `Preference`.
`java.lang.String` | `getName()` Gets the name that should be used to identify this `PreferenceStore`.
`abstract java.io.OutputStream` | `getOutputStream(Preference pref, boolean overwrite)` Gets an `OutputStream` for writing the data of the given `Preference` directly into storage.
`java.util.Iterator` | `list(java.lang.String context)` Gets an `Iterator` over all of the `Preference` objects in this `PreferenceStore` stored under the given context path.
`abstract java.util.Iterator` | `list(java.lang.String context, java.util.List preferenceTypes)` Gets an `Iterator` over all of the `Preference` objects in this `PreferenceStore` stored under the given context path with one of the given preference types.
`void` | `read(Preference pref)` Loads a `PreferenceDataObject` into the given `Preference`.
`void` | `setName(java.lang.String name)` Sets the name that should be used to identify this `PreferenceStore`.
`void` | `validate(java.lang.String context, ValidationError errors)` Validates the internal state of this `PreferenceStore` instance.
`void` | `write(Preference pref, boolean overwrite)` Saves the `PreferenceDataObject` in the given `Preference` to storage.

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

Field Detail

### PATH_SEPARATOR_CHAR

    public static final char PATH_SEPARATOR_CHAR

  The character used betwen path components in reference paths.

  See Also:
    Constant Field Values

### PATH_SEPARATOR_STRING

    public static final java.lang.String PATH_SEPARATOR_STRING

  String containing the single character used betwen path components in reference paths.

  See Also:
    Constant Field Values

### USER_CUSTOMIZATION_TYPE

    public static final java.lang.String USER_CUSTOMIZATION_TYPE

  Path type used for storing user level portlet customizations. For backward compatibility with older versions of PDK-Java, this path type must be given special treatment by the default `PreferenceStore` implementations, hence the reason why it is defined at this level.

  See Also:
    Constant Field Values

### DEFAULT_CUSTOMIZATION_TYPE

    public static final java.lang.String DEFAULT_CUSTOMIZATION_TYPE

  Path type used for storing system default and locale default level portlet customizations. For backward compatibility with older versions of PDK-Java, this path type must be given special treatment by the default `PreferenceStore` implementations, hence the reason why it is defined at this level.

  See Also:
    Constant Field Values

Constructor Detail

### PreferenceStore

    public PreferenceStore()

Method Detail

### setName

    public void setName(java.lang.String name)

  Sets the name that should be used to identify this `PreferenceStore`.

  Parameters:
    `name` - name that should be used to identify this `PreferenceStore`.

### getName

    public final java.lang.String getName()

  Gets the name that should be used to identify this `PreferenceStore`.

  Returns:
    the name that should be used to identify this `PreferenceStore`.

### list

    public java.util.Iterator list(java.lang.String context)
                            throws PreferenceStoreException

  Gets an `Iterator` over all of the `Preference` objects in this `PreferenceStore` stored under the given context path. Note that this listing is 'recursive', in that `Preference`s stored in context paths below the given one will also be returned. Provided as shorthand for `list(context, null)`.

  Parameters:
    `context` - the context path under which `Preference`s should be listed.
  Throws:
    `PreferenceStoreException` - if an error occurs during the operation.

### list

    public abstract java.util.Iterator list(java.lang.String context,
                                            java.util.List preferenceTypes)
                                     throws PreferenceStoreException

  Gets an `Iterator` over all of the `Preference` objects in this `PreferenceStore` stored under the given context path with one of the given preference types. Note that this listing is 'recursive', in that `Preference`s stored in context paths below the given one will also be returned. Note also that the data object is not loaded into any of the listed `Preference`s.

  Parameters:
    `context` - the context path under which `Preference`s should be listed.
    `preferenceTypes` - a list of strings, naming the preference types to include, or `null` if all preference types should be included.
  Throws:
    `PreferenceStoreException` - if an error occurs during the operation.

### copy

    public void copy(java.lang.String sourceContext,
                     java.lang.String destContext,
                     boolean overwrite)
              throws EntryAlreadyExistsException,
                     PreferenceStoreException

  Copies the data from all the `Preference` objects in this `PreferenceStore` with the given source context path to the given destination context path. Note that this copy is 'recursive', in that `Preference`s stored in context paths below the given source context path will also be copied (with new context paths calculated relative to the given destination context path). Provided as shorthand for `copy(sourceContext, destContext, overwrite, null)`.

  Parameters:
    `sourceContext` - the source context path from which `Preference`s should be copied.
    `destContext` - the destination context path to which `Preference`s should be copied.
    `overwrite` - boolean indicating whether preferences existing under the destination context path should be overwritten.
  Throws:
    `EntryAlreadyExistsException` - if `overwrite` was false and one or more `Preference`s were found to already exist under their destination context paths.
    `PreferenceStoreException` - if any other error occurs during the operation.

### copy

    public void copy(java.lang.String sourceContext,
                     java.lang.String destContext,
                     boolean overwrite,
                     java.util.List preferenceTypes)
              throws EntryAlreadyExistsException,
                     PreferenceStoreException

  Copies the data from all the `Preference` objects in this `PreferenceStore` with the given source context path and one of the given preference types to the given destination context path. Note that this copy is 'recursive', in that `Preference`s stored in context paths below the given source context path will also be copied (with new context paths calculated relative to the given destination context path).

  Parameters:
    `sourceContext` - the source context path from which `Preference`s should be copied.
    `destContext` - the destination context path to which `Preference`s should be copied.
    `overwrite` - boolean indicating whether preferences existing under the destination context path should be overwritten.
    `preferenceTypes` - a list of strings, naming the preference types to include, or `null` if all preference types should be included.
  Throws:
    `EntryAlreadyExistsException` - if `overwrite` was false and one or more `Preference`s were found to already exist under their destination context paths.
    `PreferenceStoreException` - if any other error occurs during the operation.

### destroy

    public void destroy(java.lang.String context)
                 throws PreferenceStoreException

  Destroys all of the `Preference` objects in this `PreferenceStore` stored under the given context path. Note that this operation is 'recursive', in that `Preference`s stored in context paths below the given one will also be destroyed. Provided as shorthand for `destroy(context, null)`.

  Parameters:
    `context` - the context path under which `Preference`s should be listed.
  Throws:
    `PreferenceStoreException` - if an error occurs during the operation.

### destroy

    public abstract void destroy(java.lang.String context,
                                 java.util.List preferenceTypes)
                          throws PreferenceStoreException

  Destroys all of the `Preference` objects in this `PreferenceStore` stored under the given context path with one of the given preference types. Note that this operation is 'recursive', in that `Preference`s stored in context paths below the given one will also be destroyed.

  Parameters:
    `context` - the context path under which `Preference`s should be listed.
    `preferenceTypes` - a list of strings, naming the preference types to include, or `null` if all preference types should be included.
  Throws:
    `PreferenceStoreException` - if an error occurs during the operation.

### exists

    public abstract boolean exists(Preference pref)
                            throws PreferenceStoreException

  Returns `true` if persisted data exists for the given `Preference`.

  Returns:
    `true` if persisted data exists for the given `Preference`, `false` otherwise.
    `PreferenceStoreException`

### read

    public void read(Preference pref)
              throws EntryNotFoundException,
                     PreferenceStoreException

  Loads a `PreferenceDataObject` into the given `Preference`.

  Throws:
    `EntryNotFoundException` - if no data for the given `Preference` exists.
    `PreferenceStoreException` - if any other error occurs during the operation.

### getInputStream

    public abstract java.io.InputStream getInputStream(Preference pref)
                                                throws EntryNotFoundException,
                                                       PreferenceStoreException

  Gets an `InputStream` for reading the data of the given `Preference`.

  This method is provided in conjunction with `getOutputStream(oracle.portal.provider.v2.preference.Preference, boolean)` as a way of streamlining the process of copying data between `PreferenceStore`s, since data can be copied directly from the `InputStream` of one `Preference` to the `OutputStream` of another, without having to instantiate a `PreferenceDataObject`.

  Throws:
    `EntryNotFoundException` - if no data for the given `Preference` exists.
    `PreferenceStoreException` - if any other error occurs during the operation.

### write

    public void write(Preference pref,
                      boolean overwrite)
               throws EntryAlreadyExistsException,
                      PreferenceStoreException

  Saves the `PreferenceDataObject` in the given `Preference` to storage.

  Parameters:
    `overwrite` - boolean indicating whether data already existing for this `Preference` should be overwritten.
  Throws:
    `EntryAlreadyExistsException` - if `overwrite` was `false` and data for the given `Preference` already exists in storage.
    `PreferenceStoreException` - if any other error occurs during the operation.

### getOutputStream

    public abstract java.io.OutputStream getOutputStream(Preference pref,
                                                         boolean overwrite)
                                                  throws EntryAlreadyExistsException,
                                                         PreferenceStoreException

  Gets an `OutputStream` for writing the data of the given `Preference` directly into storage.

  This method is provided in conjunction with `getInputStream(oracle.portal.provider.v2.preference.Preference)` as a way of streamlining the process of copying data between `PreferenceStore`s, since data can be copied directly from the `InputStream` of one `Preference` to the `OutputStream` of another, without having to instantiate a `PreferenceDataObject`.

  Throws:
    `EntryAlreadyExistsException` - if `overwrite` was `false` and data for the given `Preference` already exists in storage.
    `PreferenceStoreException` - if any other error occurs during the operation.

### copy

    public void copy(Preference sourcePref,
                     Preference destPref,
                     boolean overwrite)
              throws EntryAlreadyExistsException,
                     PreferenceStoreException

  Copies the data persisted for the given source `Preference` to the given destination `Preference`.

  Parameters:
    `sourcePref` - the `Preference` to copy data from.
    `destPref` - the `Preference` to copy data to.
    `overwrite` - boolean indicating whether data already existing for `destPref` should be overwritten.
  Throws:
    `EntryAlreadyExistsException` - if `overwrite` was false and data was found to already exist for `destPref`.
    `PreferenceStoreException` - if any other error occurs during the operation.

### destroy

    public abstract void destroy(Preference pref)
                          throws PreferenceStoreException

  Destroys the data persisted for the given `Preference`.

  Parameters:
    `pref` - the `Preference` whose persisted data should be destroyed.
  Throws:
    `PreferenceStoreException` - if an error occurs during the operation.

### validate

    public void validate(java.lang.String context,
                         ValidationError errors)

  Validates the internal state of this `PreferenceStore` instance. Errors found are reported using the supplied `ValidationError` instance.

  Specified by:
    `validate` in interface `Validateable`
  Parameters:
    `context` - The context of the calling instance.
    `errors` - The current list of errors.

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