Versioning of XML Output
------------------------
Key: BETWIXT-50
URL: http://issues.apache.org/jira/browse/BETWIXT-50
Project: Commons Betwixt
Type: Improvement
Reporter: Holger Haag
Referring to the thread "Versioning of XML Output"
(http://mail-archives.apache.org/mod_mbox/jakarta-commons-user/200605.mbox/[EMAIL
PROTECTED]) on the jakarta-commons-user mailing list, I'll provide here a SVN
patch for the described problem.
- Two new strategies: Attribute and Element suppression. Chose interfaces
instead of abstract class so that one class (see test cases) can implement
both.
- After an element/attribute descriptor has been build completely (including
the options), the suppression strategies are evaluated. If the
element/attribute shall be suppressed, it is removed from the introspection
results.
- Important: use <addDefaults add-properties="false" /> ! Otherwise the
effects of element/attribute suppression will be ... none.
- Test cases for illustration
=== Code snippets + explanation == :
* Added new Interfaces
org.apache.commons.betwixt.strategy.AttributeSuppressionStrategy
public boolean suppress(AttributeDescriptor descr);
org.apache.commons.betwixt.strategy.ElementSuppressionStrategy
public boolean suppress(ElementDescriptor descr);
* Added setter/getter methods for such strategies in
org.apache.commons.betwixt.IntrospectionConfiguration
* org.apache.commons.betwixt.digester.ElementRule: Remove element descriptor
if suppressed:
ElementDescriptor descriptor = (ElementDescriptor)digester.pop();
final Object peek = digester.peek();
if(peek instanceof ElementDescriptor) {
ElementDescriptor parent = (ElementDescriptor)digester.peek();
// check for element suppression
if(
getXMLIntrospector().getConfiguration().getElementSuppressionStrategy().suppress(descriptor))
{
parent.removeElementDescriptor(descriptor);
}
}
* org.apache.commons.betwixt.digester.AttributeRule: Remove attribute
descrptor if suppressed:
AttributeDescriptor descriptor =
(AttributeDescriptor)digester.pop();
ElementDescriptor parent = (ElementDescriptor)digester.peek();
// check for attribute suppression
if(
getXMLIntrospector().getConfiguration().getAttributeSuppressionStrategy().suppress(descriptor))
{
parent.removeAttributeDescriptor(descriptor);
}
* ElementDescriptor: new methods:
public void removeAttributeDescriptor(AttributeDescriptor descriptor) {
getAttributeList().remove(descriptor);
}
public void removeElementDescriptor(ElementDescriptor descriptor) {
getElementList().remove(descriptor);
getContentList().remove(descriptor);
}
public AttributeDescriptor getAttributeDescriptor(final String name)
{
for (int i = 0, size = attributeDescriptors.length; i < size;
i++)
{
AttributeDescriptor descr = attributeDescriptors[i];
if (descr.getQualifiedName().equals(name)) {
return descr;
}
}
return null;
}
* Test cases: package org.apache.commons.betwixt.versioning
VersioningStrategy implements both an element and versioning strategy
VersioningTest well.. .test the versioning.
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