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## org.jdom
Class Verifier

    java.lang.Object
      |
      +--org.jdom.Verifier

public final class Verifier
extends java.lang.Object

A utility class to handle well-formedness checks on names, data, and other verification tasks for JDOM. The class is final and may not be subclassed.

Version:
  $Revision: 1.49 $, $Date: 2004/02/06 09:28:30 $
Author:
  Brett McLaughlin, Elliotte Rusty Harold, Jason Hunter, Bradley S. Huffman

Method Summary
`static java.lang.String` | `checkAttributeName(java.lang.String name)` This will check the supplied name to see if it is legal for use as a JDOM ``Attribute`` name.
`static java.lang.String` | `checkCDATASection(java.lang.String data)` This will check the supplied data to see if it is legal for use as JDOM ``CDATA``.
`static java.lang.String` | `checkCharacterData(java.lang.String text)` This will check the supplied string to see if it only contains characters allowed by the XML 1.0 specification.
`static java.lang.String` | `checkCommentData(java.lang.String data)` This will check the supplied data to see if it is legal for use as JDOM ``Comment`` data.
`static java.lang.String` | `checkElementName(java.lang.String name)` This will check the supplied name to see if it is legal for use as a JDOM ``Element`` name.
`static java.lang.String` | `checkNamespaceCollision(Attribute attribute, Element element)` Check if ``Attribute``'s namespace collides with a ``Element``'s namespace.
`static java.lang.String` | `checkNamespaceCollision(Namespace namespace, Attribute attribute)` Check if a ``Namespace`` collides with a ``Attribute``'s namespace.
`static java.lang.String` | `checkNamespaceCollision(Namespace namespace, Element element)` Check if a ``Namespace`` collides with a ``Element``'s namespace.
`static java.lang.String` | `checkNamespaceCollision(Namespace namespace, java.util.List list)` Check if a ``Namespace`` collides with any namespace from a list of objects.
`static java.lang.String` | `checkNamespaceCollision(Namespace namespace, Namespace other)` Check if two namespaces collide.
`static java.lang.String` | `checkNamespacePrefix(java.lang.String prefix)` This will check the supplied name to see if it is legal for use as a JDOM ``Namespace`` prefix.
`static java.lang.String` | `checkNamespaceURI(java.lang.String uri)` This will check the supplied name to see if it is legal for use as a JDOM ``Namespace`` URI.
`static java.lang.String` | `checkProcessingInstructionData(java.lang.String data)` This will check the supplied data to see if it is legal for use as ``ProcessingInstruction`` data.
`static java.lang.String` | `checkProcessingInstructionTarget(java.lang.String target)` This will check the supplied data to see if it is legal for use as a JDOM ``ProcessingInstruction`` target.
`static java.lang.String` | `checkPublicID(java.lang.String publicID)` This will ensure that the data for a public identifier is legal.
`static java.lang.String` | `checkSystemLiteral(java.lang.String systemLiteral)` This will ensure that the data for a system literal is legal.
`static java.lang.String` | `checkURI(java.lang.String uri)` Checks a string to see if it is a legal RFC 2396 URI.
`static java.lang.String` | `checkXMLName(java.lang.String name)` This is a utility function for sharing the base process of checking any XML name.

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

Method Detail

### checkElementName

    public static java.lang.String checkElementName(java.lang.String name)

  This will check the supplied name to see if it is legal for use as a JDOM ``Element`` name.

  Parameters:
    `name` - `String` name to check.
  Returns:
    `String` reason name is illegal, or `null` if name is OK.

### checkAttributeName

    public static java.lang.String checkAttributeName(java.lang.String name)

  This will check the supplied name to see if it is legal for use as a JDOM ``Attribute`` name.

  Parameters:
    `name` - `String` name to check.
  Returns:
    `String` reason name is illegal, or `null` if name is OK.

### checkCharacterData

    public static java.lang.String checkCharacterData(java.lang.String text)

  This will check the supplied string to see if it only contains characters allowed by the XML 1.0 specification. The C0 controls (e.g. null, vertical tab, formfeed, etc.) are specifically excluded except for carriage return, linefeed, and the horizontal tab. Surrogates are also excluded.

  This method is useful for checking element content and attribute values. Note that characters like " and < are allowed in attribute values and element content. They will simply be escaped as " or < when the value is serialized.

  Parameters:
    `text` - `String` value to check.
  Returns:
    `String` reason name is illegal, or `null` if name is OK.

### checkCDATASection

    public static java.lang.String checkCDATASection(java.lang.String data)

  This will check the supplied data to see if it is legal for use as JDOM ``CDATA``.

  Parameters:
    `data` - `String` data to check.
  Returns:
    `String` reason data is illegal, or `null` is name is OK.

### checkNamespacePrefix

    public static java.lang.String checkNamespacePrefix(java.lang.String prefix)

  This will check the supplied name to see if it is legal for use as a JDOM ``Namespace`` prefix.

  Parameters:
    `prefix` - `String` prefix to check.
  Returns:
    `String` reason name is illegal, or `null` if name is OK.

### checkNamespaceURI

    public static java.lang.String checkNamespaceURI(java.lang.String uri)

  This will check the supplied name to see if it is legal for use as a JDOM ``Namespace`` URI.

  Parameters:
    `uri` - `String` URI to check.
  Returns:
    `String` reason name is illegal, or `null` if name is OK.

### checkNamespaceCollision

    public static java.lang.String checkNamespaceCollision(Namespace namespace,
                                                           Namespace other)

  Check if two namespaces collide.

  Parameters:
    `namespace` - `Namespace` to check.
    `other` - `Namespace` to check against.
  Returns:
    `String` reason for collision, or `null` if no collision.

### checkNamespaceCollision

    public static java.lang.String checkNamespaceCollision(Attribute attribute,
                                                           Element element)

  Check if ``Attribute``'s namespace collides with a ``Element``'s namespace.

  Parameters:
    `attribute` - `Attribute` to check.
    `element` - `Element` to check against.
  Returns:
    `String` reason for collision, or `null` if no collision.

### checkNamespaceCollision

    public static java.lang.String checkNamespaceCollision(Namespace namespace,
                                                           Element element)

  Check if a ``Namespace`` collides with a ``Element``'s namespace.

  Parameters:
    `namespace` - `Namespace` to check.
    `element` - `Element` to check against.
  Returns:
    `String` reason for collision, or `null` if no collision.

### checkNamespaceCollision

    public static java.lang.String checkNamespaceCollision(Namespace namespace,
                                                           Attribute attribute)

  Check if a ``Namespace`` collides with a ``Attribute``'s namespace.

  Parameters:
    `namespace` - `Namespace` to check.
    `attribute` - `Attribute` to check against.
  Returns:
    `String` reason for collision, or `null` if no collision.

### checkNamespaceCollision

    public static java.lang.String checkNamespaceCollision(Namespace namespace,
                                                           java.util.List list)

  Check if a ``Namespace`` collides with any namespace from a list of objects.

  Parameters:
    `namespace` - `Namespace` to check.
    `list` - `List` to check against.
  Returns:
    `String` reason for collision, or `null` if no collision.

### checkProcessingInstructionTarget

    public static java.lang.String checkProcessingInstructionTarget(java.lang.String target)

  This will check the supplied data to see if it is legal for use as a JDOM ``ProcessingInstruction`` target.

  Parameters:
    `target` - `String` target to check.
  Returns:
    `String` reason target is illegal, or `null` if target is OK.

### checkProcessingInstructionData

    public static java.lang.String checkProcessingInstructionData(java.lang.String data)

  This will check the supplied data to see if it is legal for use as ``ProcessingInstruction`` data. Besides checking that all the characters are allowed in XML, this also checks that the data does not contain the PI end-string "?>".

  Parameters:
    `data` - `String` data to check.
  Returns:
    `String` reason data is illegal, or `null` if data is OK.

### checkCommentData

    public static java.lang.String checkCommentData(java.lang.String data)

  This will check the supplied data to see if it is legal for use as JDOM ``Comment`` data.

  Parameters:
    `data` - `String` data to check.
  Returns:
    `String` reason data is illegal, or `null` if data is OK.

### checkPublicID

    public static java.lang.String checkPublicID(java.lang.String publicID)

  This will ensure that the data for a public identifier is legal.

  Parameters:
    `publicID` - `String` public ID to check.
  Returns:
    `String` reason public ID is illegal, or `null` if public ID is OK.

### checkSystemLiteral

    public static java.lang.String checkSystemLiteral(java.lang.String systemLiteral)

  This will ensure that the data for a system literal is legal.

  Parameters:
    `systemLiteral` - `String` system literal to check.
  Returns:
    `String` reason system literal is illegal, or `null` if system literal is OK.

### checkXMLName

    public static java.lang.String checkXMLName(java.lang.String name)

  This is a utility function for sharing the base process of checking any XML name.

  Parameters:
    `name` - `String` to check for XML name compliance.
  Returns:
    `String` reason the name is illegal, or `null` if OK.

### checkURI

    public static java.lang.String checkURI(java.lang.String uri)

  Checks a string to see if it is a legal RFC 2396 URI. Both absolute and relative URIs are supported.

  Parameters:
    `uri` - `String` to check.
  Returns:
    `String` reason the URI is illegal, or `null` if OK.

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Copyright © 2004 Jason Hunter, Brett McLaughlin. All Rights Reserved.