org.apache.xml.utils

## Class SerializableLocatorImpl

- java.lang.Object
- - org.apache.xml.utils.SerializableLocatorImpl

- All Implemented Interfaces:
    java.io.Serializable, Locator

      public class SerializableLocatorImpl
      extends java.lang.Object
      implements Locator, java.io.Serializable

  The standard SAX implementation of LocatorImpl is not serializable, limiting its utility as "a persistent snapshot of a locator". This is a quick hack to make it so. Note that it makes more sense in many cases to set up fields to hold this data rather than pointing at another object... but that decision should be made on architectural grounds rather than serializability.

  It isn't clear whether subclassing LocatorImpl and adding serialization methods makes more sense than copying it and just adding Serializable to its interface. Since it's so simple, I've taken the latter approach for now.

  Since:
    XalanJ2
  Version:
    1.0
  Author:
    Joe Kesselman
  See Also:
    `LocatorImpl`, `Locator`, Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `SerializableLocatorImpl()` Zero-argument constructor.
    `SerializableLocatorImpl(Locator locator)` Copy constructor.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getColumnNumber()` Return the saved column number (1-based).
    `int` | `getLineNumber()` Return the saved line number (1-based).
    `java.lang.String` | `getPublicId()` Return the saved public identifier.
    `java.lang.String` | `getSystemId()` Return the saved system identifier.
    `void` | `setColumnNumber(int columnNumber)` Set the column number for this locator (1-based).
    `void` | `setLineNumber(int lineNumber)` Set the line number for this locator (1-based).
    `void` | `setPublicId(java.lang.String publicId)` Set the public identifier for this locator.
    `void` | `setSystemId(java.lang.String systemId)` Set the system identifier for this locator.

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### SerializableLocatorImpl

          public SerializableLocatorImpl()

      Zero-argument constructor.

      SAX says "This will not normally be useful, since the main purpose of this class is to make a snapshot of an existing Locator." In fact, it _is_ sometimes useful when you want to construct a new Locator pointing to a specific location... which, after all, is why the setter methods are provided.

    - #### SerializableLocatorImpl

          public SerializableLocatorImpl(Locator locator)

      Copy constructor.

      Create a persistent copy of the current state of a locator. When the original locator changes, this copy will still keep the original values (and it can be used outside the scope of DocumentHandler methods).

      Parameters:
        `locator` - The locator to copy.

  - ### Method Detail

    - #### getPublicId

          public java.lang.String getPublicId()

      Return the saved public identifier.
      Specified by:
        `getPublicId` in interface `Locator`
      Returns:
        The public identifier as a string, or null if none is available.
      See Also:
        `Locator.getPublicId()`, `setPublicId(java.lang.String)`

    - #### getSystemId

          public java.lang.String getSystemId()

      Return the saved system identifier.
      Specified by:
        `getSystemId` in interface `Locator`
      Returns:
        The system identifier as a string, or null if none is available.
      See Also:
        `Locator.getSystemId()`, `setSystemId(java.lang.String)`

    - #### getLineNumber

          public int getLineNumber()

      Return the saved line number (1-based).
      Specified by:
        `getLineNumber` in interface `Locator`
      Returns:
        The line number as an integer, or -1 if none is available.
      See Also:
        `Locator.getLineNumber()`, `setLineNumber(int)`

    - #### getColumnNumber

          public int getColumnNumber()

      Return the saved column number (1-based).
      Specified by:
        `getColumnNumber` in interface `Locator`
      Returns:
        The column number as an integer, or -1 if none is available.
      See Also:
        `Locator.getColumnNumber()`, `setColumnNumber(int)`

    - #### setPublicId

          public void setPublicId(java.lang.String publicId)

      Set the public identifier for this locator.
      Parameters:
        `publicId` - The new public identifier, or null if none is available.
      See Also:
        `getPublicId()`

    - #### setSystemId

          public void setSystemId(java.lang.String systemId)

      Set the system identifier for this locator.
      Parameters:
        `systemId` - The new system identifier, or null if none is available.
      See Also:
        `getSystemId()`

    - #### setLineNumber

          public void setLineNumber(int lineNumber)

      Set the line number for this locator (1-based).
      Parameters:
        `lineNumber` - The line number, or -1 if none is available.
      See Also:
        `getLineNumber()`

    - #### setColumnNumber

          public void setColumnNumber(int columnNumber)

      Set the column number for this locator (1-based).
      Parameters:
        `columnNumber` - The column number, or -1 if none is available.
      See Also:
        `getColumnNumber()`

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