org.apache.shindig.gadgets.rewrite
Class ResourceMutateVisitor

java.lang.Object
  org.apache.shindig.gadgets.rewrite.ResourceMutateVisitor

All Implemented Interfaces:

DomWalker.Visitor

Direct Known Subclasses:

ProxyingVisitor

public abstract class ResourceMutateVisitor
extends Object
implements DomWalker.Visitor

Abstract visitor that walks over html tags as specified by resourceTags and prepares list of html tag nodes whose uri attributes can be mutated. Implementations can override mutateUris(org.apache.shindig.gadgets.Gadget, java.util.Collection) for uses cases like proxying resources, making url's absolute, prefetching images etc. TODO: Refactor AbsolutePathReferenceVisitor to extend ResourceMutateVisitor.

Since:

2.0.0

Nested Class Summary

static class

ResourceMutateVisitor.Tags Enum for resource tags and associated attributes that should be mutated.

Nested classes/interfaces inherited from interface org.apache.shindig.gadgets.rewrite.DomWalker.Visitor

DomWalker.Visitor.VisitStatus

Field Summary

protected ContentRewriterFeature.Config	featureConfig
protected Map<String,String>	resourceTags

Constructor Summary

ResourceMutateVisitor(ContentRewriterFeature.Config featureConfig, ResourceMutateVisitor.Tags... resourceTags)

Method Summary

protected abstract Collection<Pair<Node,Uri>>	mutateUris(Gadget gadget, Collection<Node> nodes)
boolean	revisit(Gadget gadget, List<Node> nodes) Revisit a node in the DOM that was marked by the visit(Gadget, Node) as reserved during DOM traversal.
DomWalker.Visitor.VisitStatus	visit(Gadget gadget, Node node) Visit a particular Node in the DOM.

Methods inherited from class java.lang.Object

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

Field Detail

resourceTags

protected final Map<String,String> resourceTags

featureConfig

protected final ContentRewriterFeature.Config featureConfig

Constructor Detail

ResourceMutateVisitor

public ResourceMutateVisitor(ContentRewriterFeature.Config featureConfig,
                             ResourceMutateVisitor.Tags... resourceTags)

Method Detail

visit

public DomWalker.Visitor.VisitStatus visit(Gadget gadget,
                                           Node node)
                                    throws RewritingException

Visit a particular Node in the DOM.

Specified by:

visit in interface DomWalker.Visitor

Parameters:

gadget - Context for the request.

node - Node being visited.

Returns:

Status, see VisitStatus

Throws:

RewritingException

revisit

public boolean revisit(Gadget gadget,
                       List<Node> nodes)
                throws RewritingException

Revisit a node in the DOM that was marked by the visit(Gadget, Node) as reserved during DOM traversal.

Specified by:

revisit in interface DomWalker.Visitor

Parameters:

gadget - Context for the request.

nodes - Nodes being revisited, previously marked as reserved.

Returns:

True if any node modified, false otherwise.

Throws:

RewritingException

mutateUris

protected abstract Collection<Pair<Node,Uri>> mutateUris(Gadget gadget,
                                                         Collection<Node> nodes)