org.xmlpull.infoset.xpath.jaxen.pattern.PatternHandler Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of xpp5 Show documentation
Show all versions of xpp5 Show documentation
XML Pull parser library developed by extreme lab
/*
* $Header: /l/extreme/cvs/codes/xpp5/xis5/infoset_xpath_jaxen/org/xmlpull/infoset/xpath/jaxen/pattern/PatternHandler.java,v 1.1 2005/05/16 23:59:26 aslom Exp $
* $Revision: 1.1 $
* $Date: 2005/05/16 23:59:26 $
*
* ====================================================================
*
* Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions, and the disclaimer that follows
* these conditions in the documentation and/or other materials
* provided with the distribution.
*
* 3. The name "Jaxen" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 4. Products derived from this software may not be called "Jaxen", nor
* may "Jaxen" appear in their name, without prior written permission
* from the Jaxen Project Management ([email protected]).
*
* In addition, we request (but do not require) that you include in the
* end-user documentation provided with the redistribution and/or in the
* software itself an acknowledgement equivalent to the following:
* "This product includes software developed by the
* Jaxen Project (http://www.jaxen.org/)."
* Alternatively, the acknowledgment may be graphical using the logos
* available at http://www.jaxen.org/
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* ====================================================================
* This software consists of voluntary contributions made by many
* individuals on behalf of the Jaxen Project and was originally
* created by bob mcwhirter and
* James Strachan . For more information on the
* Jaxen Project, please see XPathHandler implementation capable
* of building Jaxen expression trees which can walk various
* different object models.
*
* @author bob mcwhirter ([email protected])
*/
public class PatternHandler extends JaxenHandler
{
private Pattern pattern;
public PatternHandler()
{
}
/** Retrieve the simplified Jaxen Pattern expression tree.
*
*
* This method is only valid once XPathReader.parse(...)
* successfully returned.
*
*
* @return The Pattern expression tree.
*/
public Pattern getPattern()
{
return getPattern( true );
}
/** Retrieve the Jaxen Pattern expression tree, optionally
* simplified.
*
*
* This method is only valid once XPathReader.parse(...)
* successfully returned.
*
*
* @return The Pattern expression tree.
*/
public Pattern getPattern(boolean shouldSimplify)
{
if ( shouldSimplify && ! this.simplified )
{
//System.err.println("simplifyin....");
this.pattern.simplify();
this.simplified = true;
}
return this.pattern;
}
public void endXPath() throws JaxenException
{
this.pattern = (Pattern) pop();
System.out.println( "stack is: " + stack );
popFrame();
}
public void endPathExpr() throws JaxenException
{
//System.err.println("endPathExpr()");
// PathExpr ::= LocationPath
// | FilterExpr
// | FilterExpr / RelativeLocationPath
// | FilterExpr // RelativeLocationPath
//
// If the current stack-frame has two items, it's a
// FilterExpr and a LocationPath (of some flavor).
//
// If the current stack-frame has one item, it's simply
// a FilterExpr, and more than like boils down to a
// primary expr of some flavor. But that's for another
// method...
LinkedList frame = popFrame();
System.out.println( "endPathExpr(): " + frame );
push( frame.removeFirst() );
/*
LocationPathPattern locationPath = new LocationPathPattern();
push( locationPath );
while (! frame.isEmpty() )
{
Object filter = frame.removeLast();
if ( filter instanceof NodeTest )
{
locationPath.setNodeTest( (NodeTest) filter );
}
else if ( filter instanceof FilterExpr )
{
locationPath.addFilter( (FilterExpr) filter );
}
else if ( filter instanceof LocationPathPattern )
{
LocationPathPattern parent = (LocationPathPattern) filter;
locationPath.setParentPattern( parent );
locationPath = parent;
}
else if ( filter != null )
{
throw new JaxenException( "Unknown filter: " + filter );
}
}
*/
}
public void startAbsoluteLocationPath() throws JaxenException
{
//System.err.println("startAbsoluteLocationPath()");
pushFrame();
push( createAbsoluteLocationPath() );
}
public void endAbsoluteLocationPath() throws JaxenException
{
//System.err.println("endAbsoluteLocationPath()");
endLocationPath();
}
public void startRelativeLocationPath() throws JaxenException
{
//System.err.println("startRelativeLocationPath()");
pushFrame();
push( createRelativeLocationPath() );
}
public void endRelativeLocationPath() throws JaxenException
{
//System.err.println("endRelativeLocationPath()");
endLocationPath();
}
protected void endLocationPath() throws JaxenException
{
// start at the back, its the main pattern then add everything else as
LinkedList list = popFrame();
System.out.println( "endLocationPath: " + list );
LocationPathPattern locationPath = (LocationPathPattern) list.removeFirst();
push( locationPath );
boolean doneNodeTest = false;
while ( ! list.isEmpty() )
{
Object filter = list.removeFirst();
if ( filter instanceof NodeTest )
{
if ( doneNodeTest )
{
LocationPathPattern parent = new LocationPathPattern( (NodeTest) filter );
locationPath.setParentPattern( parent );
locationPath = parent;
doneNodeTest = false;
}
else
{
locationPath.setNodeTest( (NodeTest) filter );
}
}
else if ( filter instanceof FilterExpr )
{
locationPath.addFilter( (FilterExpr) filter );
}
else if ( filter instanceof LocationPathPattern )
{
LocationPathPattern parent = (LocationPathPattern) filter;
locationPath.setParentPattern( parent );
locationPath = parent;
doneNodeTest = false;
}
}
}
public void startNameStep(int axis,
String prefix,
String localName) throws JaxenException
{
//System.err.println("startNameStep(" + axis + ", " + prefix + ", " + localName + ")");
pushFrame();
short nodeType = Pattern.ELEMENT_NODE;
switch ( axis )
{
case Axis.ATTRIBUTE:
nodeType = Pattern.ATTRIBUTE_NODE;
break;
case Axis.NAMESPACE:
nodeType = Pattern.NAMESPACE_NODE;
break;
}
if ( prefix != null && prefix.length() > 0 && ! prefix.equals( "*" ) )
{
push( new NamespaceTest( prefix, nodeType ) );
}
if ( localName != null && localName.length() > 0 && ! localName.equals( "*" ) )
{
push( new NameTest( localName, nodeType ) );
}
}
public void startTextNodeStep(int axis) throws JaxenException
{
//System.err.println("startTextNodeStep()");
pushFrame();
push( new NodeTypeTest( Pattern.TEXT_NODE ) );
}
public void startCommentNodeStep(int axis) throws JaxenException
{
//System.err.println("startCommentNodeStep()");
pushFrame();
push( new NodeTypeTest( Pattern.COMMENT_NODE ) );
}
public void startAllNodeStep(int axis) throws JaxenException
{
//System.err.println("startAllNodeStep()");
pushFrame();
push( AnyNodeTest.getInstance() );
}
public void startProcessingInstructionNodeStep(int axis,
String name) throws JaxenException
{
//System.err.println("startProcessingInstructionStep()");
pushFrame();
// XXXX: should we throw an exception if name is present?
push( new NodeTypeTest( Pattern.PROCESSING_INSTRUCTION_NODE ) );
}
protected void endStep()
{
LinkedList list = popFrame();
if ( ! list.isEmpty() )
{
push( list.removeFirst() );
if ( ! list.isEmpty() )
{
System.out.println( "List should now be empty!" + list );
}
}
}
public void startUnionExpr() throws JaxenException
{
//System.err.println("startUnionExpr()");
}
public void endUnionExpr(boolean create) throws JaxenException
{
//System.err.println("endUnionExpr()");
if ( create )
{
//System.err.println("makeUnionExpr");
Expr rhs = (Expr) pop();
Expr lhs = (Expr) pop();
push( getXPathFactory().createUnionExpr( lhs,
rhs ) );
}
}
protected Pattern createAbsoluteLocationPath()
{
return new LocationPathPattern( NodeTypeTest.DOCUMENT_TEST );
}
protected Pattern createRelativeLocationPath()
{
return new LocationPathPattern();
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy