org.apache.slide.search.basic
Class NotNormalizer

java.lang.Object
  org.apache.slide.search.basic.NotNormalizer

public class NotNormalizer

extends java.lang.Object

This class recursivly removes all <not> expressions and replaces their successors by appropriate negated expressions. Since an example explains more than a thousand words:

 <D:not>
    <D:or>
       <D:lt>
          <D:prop>
             <D:getcontentlength>
          </D:prop>
          <D:literal>1000</D:literal>
       </D:lt>
       <D:eq>
          <D:prop>
             <D:getcontenttype>
          </D:prop>
          <D:literal>text/xml</D:literal>
       </D:eq>
    </D:or>
 </D:not>
 

will be transformed to

 <D:and>
    <D:not-lt>
       <D:prop>
          <D:getcontentlength>
       </D:prop>
       <D:literal>1000</D:literal>
    </D:not-lt>
    <D:not-eq>
       <D:prop>
          <D:getcontenttype>
       </D:prop>
       <D:literal>text/xml</D:literal>
    </D:not-eq>
 </D:and>
 

Version:

$Revision: 1.8 $

Field Summary

static java.lang.String

BAD_NOT_EXPRESSION_EXCEPTION_MESSAGE The message of the InvalidQueryException which is thrown by getQueryWithoutNotExpression if a <not> expression has NOT exactly one successor.

Constructor Summary

NotNormalizer()

Method Summary

protected org.jdom.Element	getNamedClone(org.jdom.Element source, java.lang.String newName, org.jdom.Namespace newNamespace) Creates a new Element with the given newName in the newNamespace and sets the value (text) and attributes of the given source element.
protected org.jdom.Element	getNegatedDAVQueryElement(org.jdom.Element expressionElement) Returns the negation of the given expressionElement, which is in the DAV: namespace.
protected org.jdom.Element	getNegatedQueryElement(org.jdom.Element expressionElement) Returns the negation of the given expressionElement.
protected org.jdom.Element	getNegatedSlideQueryElement(org.jdom.Element expressionElement) Returns the negation of the given expressionElement, which is in the http://jakarta.apache.org/slide/ namespace.
protected org.jdom.Element	getNegatedUnknownQueryElement(org.jdom.Element expressionElement) Returns the negation of the given expressionElement, which is neither in DAV: nor http://jakarta.apache.org/slide/ namespace.
protected org.jdom.Element	getProcessedElement(org.jdom.Element expressionElement, boolean negate) Returns the appropriate replacement for the given expressionElement.
org.jdom.Element	getQueryWithoutNotExpression(org.jdom.Element expressionElement) Returns the transformed query where all <not> elements has been removed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BAD_NOT_EXPRESSION_EXCEPTION_MESSAGE

public static final java.lang.String BAD_NOT_EXPRESSION_EXCEPTION_MESSAGE

The message of the InvalidQueryException which is thrown by getQueryWithoutNotExpression if a <not> expression has NOT exactly one successor.

See Also:

Constant Field Values

Constructor Detail

NotNormalizer

public NotNormalizer()

Method Detail

getQueryWithoutNotExpression

public org.jdom.Element getQueryWithoutNotExpression(org.jdom.Element expressionElement)
                                              throws BadQueryException

Returns the transformed query where all <not> elements has been removed.

Parameters:

expressionElement - the (root) Element of the query to transform.

Returns:

the transformed query where all <not> elements has been removed.

Throws:

BadQueryException - if transformin the query failed (see BAD_NOT_EXPRESSION_EXCEPTION_MESSAGE).

getProcessedElement

protected org.jdom.Element getProcessedElement(org.jdom.Element expressionElement,
                                               boolean negate)
                                        throws BadQueryException

Returns the appropriate replacement for the given expressionElement. If negate is true, the Element has to be negated.

Parameters:

expressionElement - the Element for which to return the appropriate replacement.

negate - if negate is true, the given Element has to be negated.

Returns:

the appropriate replacement for the given expressionElement.

Throws:

BadQueryException - if the Element could not be processed.

getNegatedQueryElement

protected org.jdom.Element getNegatedQueryElement(org.jdom.Element expressionElement)
                                           throws BadQueryException

Returns the negation of the given expressionElement.

Parameters:

expressionElement - the Element to return the appropriate negation for.

Returns:

the negation of the given expressionElement.

Throws:

BadQueryException - if the Element could not be processed.

getNegatedUnknownQueryElement

protected org.jdom.Element getNegatedUnknownQueryElement(org.jdom.Element expressionElement)
                                                  throws BadQueryException

Returns the negation of the given expressionElement, which is neither in DAV: nor http://jakarta.apache.org/slide/ namespace.

Parameters:

expressionElement - the Element to return the appropriate negation for.

Returns:

the negation of the given expressionElement.

Throws:

BadQueryException - if the Element could not be processed.

getNegatedDAVQueryElement

protected org.jdom.Element getNegatedDAVQueryElement(org.jdom.Element expressionElement)
                                              throws BadQueryException

Returns the negation of the given expressionElement, which is in the DAV: namespace.

Parameters:

expressionElement - the Element to return the appropriate negation for.

Returns:

the negation of the given expressionElement.

Throws:

BadQueryException - if the Element could not be processed.

getNegatedSlideQueryElement

protected org.jdom.Element getNegatedSlideQueryElement(org.jdom.Element expressionElement)
                                                throws BadQueryException

Returns the negation of the given expressionElement, which is in the http://jakarta.apache.org/slide/ namespace.

Parameters:

expressionElement - the Element to return the appropriate negation for.

Returns:

the negation of the given expressionElement.

Throws:

BadQueryException - if the Element could not be processed.

getNamedClone

protected org.jdom.Element getNamedClone(org.jdom.Element source,
                                         java.lang.String newName,
                                         org.jdom.Namespace newNamespace)

Creates a new Element with the given newName in the newNamespace and sets the value (text) and attributes of the given source element.

Parameters:

source - the Element from which to copy the value and attributes.

newName - the name to use for the Element to create.

newNamespace - the Namespace to use for the Element to create.

Returns:

the created Element.