gecko-dev/rdf/tests/dsds/nsRDFDataSourceDS.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCRT.h"
#include "nsCOMPtr.h"
#include "nsIRDFService.h"
#include "nsRDFCID.h"
#include "nsIRDFDataSource.h"
#include "nsIRDFRemoteDataSource.h"
#include "rdf.h"
#include "nsIServiceManager.h"
#include "nsEnumeratorUtils.h"
#include "nsXPIDLString.h"
#ifdef NS_DEBUG
#include <stdio.h>
#endif
/**
* RDF vocabulary describing assertions in inner datasource
*
* For a particular resource, we want to provide all arcs out and
* in that the inner datasource has.
* This is done by introducing helper resources for each triple of
* the form
* x-moz-dsds:<subject-resource-pointer><predicate-resource-pointer>\
* <object-node-pointer>
* For each triple, that has the resource in question as subject, a
* "arcsout" assertion goes from that resource to a x-moz-dsds resource.
* For each triple, that has the resource in question as object, a
* "arcsin" assertion goes from that resource to a x-moz-dsds resource.
* For each x-moz-dsds resource, there is a "subject" arc to the subject,
* a "predicate" arc to the predicate and a "object" arc to the object.
*
* The namespace of this vocabulary is
* "http://www.mozilla.org/rdf/vocab/dsds".
*
* XXX we might want to add a "qname" resource from each resource to a
* somewhat canonical "prefix:localname" literal.
*/
#define NS_RDF_DSDS_NAMESPACE_URI "http://www.mozilla.org/rdf/vocab/dsds#"
#define NS_RDF_ARCSOUT NS_RDF_DSDS_NAMESPACE_URI "arcsout"
#define NS_RDF_ARCSIN NS_RDF_DSDS_NAMESPACE_URI "arcsin"
#define NS_RDF_SUBJECT NS_RDF_DSDS_NAMESPACE_URI "subject"
#define NS_RDF_PREDICATE NS_RDF_DSDS_NAMESPACE_URI "predicate"
#define NS_RDF_OBJECT NS_RDF_DSDS_NAMESPACE_URI "object"
#define NC_RDF_Name NC_NAMESPACE_URI "Name"
#define NC_RDF_Value NC_NAMESPACE_URI "Value"
#define NC_RDF_Child NC_NAMESPACE_URI "child"
static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
class nsRDFDataSourceDataSource :
public nsIRDFDataSource,
public nsIRDFRemoteDataSource {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRDFDATASOURCE
NS_DECL_NSIRDFREMOTEDATASOURCE
nsRDFDataSourceDataSource();
virtual ~nsRDFDataSourceDataSource();
private:
nsCString mURI;
nsCOMPtr<nsIRDFDataSource> mDataSource;
static nsIRDFResource* kNC_Name;
static nsIRDFResource* kNC_Value;
static nsIRDFResource* kNC_Child;
};
nsIRDFResource* nsRDFDataSourceDataSource::kNC_Name=nsnull;
nsIRDFResource* nsRDFDataSourceDataSource::kNC_Value=nsnull;
nsIRDFResource* nsRDFDataSourceDataSource::kNC_Child=nsnull;
nsRDFDataSourceDataSource::nsRDFDataSourceDataSource()
{
}
nsRDFDataSourceDataSource::~nsRDFDataSourceDataSource()
{
}
NS_IMPL_ISUPPORTS2(nsRDFDataSourceDataSource,
nsIRDFDataSource,
nsIRDFRemoteDataSource)
/**
* Implement nsIRDFRemoteDataSource
*/
/* readonly attribute boolean loaded; */
NS_IMETHODIMP nsRDFDataSourceDataSource::GetLoaded(PRBool *aLoaded)
{
nsCOMPtr<nsIRDFRemoteDataSource> remote =
do_QueryInterface(mDataSource);
if (remote) {
return remote->GetLoaded(aLoaded);
}
*aLoaded = PR_TRUE;
return NS_OK;
}
/* void Init (in string uri); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::Init(const char *uri)
{
nsresult rv;
mURI = uri;
// cut off "rdf:datasource?"
NS_NAMED_LITERAL_CSTRING(prefix, "rdf:datasource");
nsCAutoString mInnerURI;
mInnerURI = Substring(mURI, prefix.Length() + 1);
// bail if datasorce is empty or we're trying to inspect ourself
if (mInnerURI.IsEmpty() || mInnerURI == prefix) {
mURI.Truncate();
return NS_ERROR_INVALID_ARG;
}
nsCOMPtr<nsIRDFService> rdf(do_GetService(kRDFServiceCID, &rv));
rv = rdf->GetDataSource(mInnerURI.get(), getter_AddRefs(mDataSource));
if (NS_FAILED(rv)) {
mURI.Truncate();
NS_WARNING("Could not get inner datasource");
return rv;
}
// get RDF resources
if (!kNC_Name) {
rdf->GetResource(NS_LITERAL_CSTRING(NC_RDF_Name), &kNC_Name);
rdf->GetResource(NS_LITERAL_CSTRING(NC_RDF_Child), &kNC_Child);
rdf->GetResource(NS_LITERAL_CSTRING(NC_RDF_Value), &kNC_Value);
}
#ifdef DEBUG_alecf
printf("nsRDFDataSourceDataSource::Init(%s)\n", uri);
#endif
return NS_OK;
}
/* void Refresh (in boolean aBlocking); */
NS_IMETHODIMP nsRDFDataSourceDataSource::Refresh(PRBool aBlocking)
{
nsCOMPtr<nsIRDFRemoteDataSource> remote =
do_QueryInterface(mDataSource);
if (remote) {
return remote->Refresh(aBlocking);
}
return NS_OK;
}
/* void Flush (); */
NS_IMETHODIMP nsRDFDataSourceDataSource::Flush()
{
return NS_ERROR_NOT_IMPLEMENTED;
}
/* void FlushTo (in string aURI); */
NS_IMETHODIMP nsRDFDataSourceDataSource::FlushTo(const char *aURI)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
/**
* Implement nsIRDFDataSource
*/
/* readonly attribute string URI; */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetURI(char * *aURI)
{
#ifdef DEBUG_alecf
printf("nsRDFDataSourceDataSource::GetURI()\n");
#endif
*aURI = ToNewCString(mURI);
return NS_OK;
}
/* nsIRDFResource GetSource (in nsIRDFResource aProperty, in nsIRDFNode aTarget, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetSource(nsIRDFResource *aProperty,
nsIRDFNode *aTarget,
PRBool aTruthValue,
nsIRDFResource **_retval)
{
return NS_RDF_NO_VALUE;
}
/* nsISimpleEnumerator GetSources (in nsIRDFResource aProperty, in nsIRDFNode aTarget, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetSources(nsIRDFResource *aProperty,
nsIRDFNode *aTarget,
PRBool aTruthValue,
nsISimpleEnumerator **_retval)
{
return NS_RDF_NO_VALUE;
}
/* nsIRDFNode GetTarget (in nsIRDFResource aSource, in nsIRDFResource aProperty, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetTarget(nsIRDFResource *aSource,
nsIRDFResource *aProperty,
PRBool aTruthValue,
nsIRDFNode **_retval)
{
#ifdef DEBUG_alecf
nsXPIDLCString sourceval;
nsXPIDLCString propval;
aSource->GetValue(getter_Copies(sourceval));
aProperty->GetValue(getter_Copies(propval));
printf("GetTarget(%s, %s,..)\n", (const char*)sourceval,
(const char*)propval);
#endif
return NS_OK;
}
/* nsISimpleEnumerator GetTargets (in nsIRDFResource aSource, in nsIRDFResource aProperty, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetTargets(nsIRDFResource *aSource,
nsIRDFResource *aProperty,
PRBool aTruthValue,
nsISimpleEnumerator **_retval)
{
nsXPIDLCString sourceval;
aSource->GetValue(getter_Copies(sourceval));
nsXPIDLCString propval;
aProperty->GetValue(getter_Copies(propval));
#ifdef DEBUG_alecf
printf("GetTargets(%s, %s,..)\n", (const char*)sourceval,
(const char*)propval);
#endif
nsresult rv;
PRBool isProp;
nsCOMPtr<nsISupportsArray> arcs;
nsISimpleEnumerator *enumerator;
if (NS_SUCCEEDED(aProperty->EqualsNode(kNC_Child, &isProp)) &&
isProp) {
// here we need to determine if we need to extract out the source
// or use aSource?
if (StringBeginsWith(sourceval, NS_LITERAL_CSTRING("dsresource:"))) {
// somehow get the source
// XXX ? rv = mDataSource->ArcLabelsOut(realsource, &enumerator);
rv = mDataSource->ArcLabelsOut(aSource, &enumerator);
} else {
rv = mDataSource->ArcLabelsOut(aSource, &enumerator);
}
// enumerate all the children and create the composite resources
PRBool hasMoreArcs=PR_FALSE;
rv = enumerator->HasMoreElements(&hasMoreArcs);
while (NS_SUCCEEDED(rv) && hasMoreArcs) {
// get the next arc
nsCOMPtr<nsISupports> arcSupports;
rv = enumerator->GetNext(getter_AddRefs(arcSupports));
nsCOMPtr<nsIRDFResource> arc = do_QueryInterface(arcSupports, &rv);
// get all the resources on the ends of the arc arcs
nsCOMPtr<nsISimpleEnumerator> targetEnumerator;
rv = mDataSource->GetTargets(aSource, arc, PR_TRUE,
getter_AddRefs(targetEnumerator));
PRBool hasMoreTargets;
rv = targetEnumerator->HasMoreElements(&hasMoreTargets);
while (NS_SUCCEEDED(rv) && hasMoreTargets) {
// get the next target
nsCOMPtr<nsISupports> targetSupports;
rv = enumerator->GetNext(getter_AddRefs(targetSupports));
nsCOMPtr<nsIRDFResource> target=do_QueryInterface(targetSupports, &rv);
// now we have an (arc, target) tuple that will be our node
// arc will become #Name
// target will become #Value
#ifdef DEBUG_alecf
nsXPIDLString arcValue;
nsXPIDLString targetValue;
arc->GetValue(getter_Copies(arcValue));
target->GetValue(getter_Copies(targetValue));
printf("#child of %s:\n\t%s = %s\n",
(const char*)sourceval
#endif
}
rv = enumerator->HasMoreElements(&hasMoreArcs);
}
} else if (NS_SUCCEEDED(aProperty->EqualsNode(kNC_Name, &isProp)) &&
isProp) {
if (StringBeginsWith(sourceval, NS_LITERAL_CSTRING("dsresource:"))) {
// extract out the name
}
} else if (NS_SUCCEEDED(aProperty->EqualsNode(kNC_Value, &isProp)) &&
isProp) {
} else {
rv = NS_NewISupportsArray(getter_AddRefs(arcs));
if (NS_FAILED(rv)) return rv;
nsArrayEnumerator* cursor =
new nsArrayEnumerator(arcs);
if (!cursor) return NS_ERROR_OUT_OF_MEMORY;
*_retval = cursor;
NS_ADDREF(*_retval);
}
return NS_OK;
}
/* void Assert (in nsIRDFResource aSource, in nsIRDFResource aProperty, in nsIRDFNode aTarget, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::Assert(nsIRDFResource *aSource, nsIRDFResource *aProperty, nsIRDFNode *aTarget, PRBool aTruthValue)
{
return NS_RDF_NO_VALUE;
}
/* void Unassert (in nsIRDFResource aSource, in nsIRDFResource aProperty, in nsIRDFNode aTarget); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::Unassert(nsIRDFResource *aSource, nsIRDFResource *aProperty, nsIRDFNode *aTarget)
{
return NS_RDF_NO_VALUE;
}
/* boolean HasAssertion (in nsIRDFResource aSource, in nsIRDFResource aProperty, in nsIRDFNode aTarget, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::HasAssertion(nsIRDFResource *aSource, nsIRDFResource *aProperty, nsIRDFNode *aTarget, PRBool aTruthValue, PRBool *_retval)
{
return NS_RDF_NO_VALUE;
}
/* void AddObserver (in nsIRDFObserver aObserver); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::AddObserver(nsIRDFObserver *aObserver)
{
return NS_RDF_NO_VALUE;
}
/* void RemoveObserver (in nsIRDFObserver aObserver); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::RemoveObserver(nsIRDFObserver *aObserver)
{
return NS_RDF_NO_VALUE;
}
/* nsISimpleEnumerator ArcLabelsIn (in nsIRDFNode aNode); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::ArcLabelsIn(nsIRDFNode *aNode, nsISimpleEnumerator **_retval)
{
return NS_RDF_NO_VALUE;
}
/* nsISimpleEnumerator ArcLabelsOut (in nsIRDFResource aSource); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::ArcLabelsOut(nsIRDFResource *aSource,
nsISimpleEnumerator **_retval)
{
nsresult rv=NS_OK;
nsCOMPtr<nsISupportsArray> arcs;
rv = NS_NewISupportsArray(getter_AddRefs(arcs));
if (NS_FAILED(rv)) return rv;
nsXPIDLCString sourceval;
aSource->GetValue(getter_Copies(sourceval));
#ifdef DEBUG_alecf
printf("ArcLabelsOut(%s)\n", (const char*)sourceval);
#endif
arcs->AppendElement(kNC_Name);
arcs->AppendElement(kNC_Value);
arcs->AppendElement(kNC_Child);
nsArrayEnumerator* cursor =
new nsArrayEnumerator(arcs);
if (!cursor) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(cursor);
*_retval = cursor;
return NS_OK;
}
/* nsISimpleEnumerator GetAllResources (); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetAllResources(nsISimpleEnumerator **_retval)
{
return NS_RDF_NO_VALUE;
}
/* boolean IsCommandEnabled (in nsISupportsArray aSources, in nsIRDFResource aCommand, in nsISupportsArray aArguments); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::IsCommandEnabled(nsISupportsArray * aSources, nsIRDFResource *aCommand, nsISupportsArray * aArguments, PRBool *_retval)
{
return NS_RDF_NO_VALUE;
}
/* void DoCommand (in nsISupportsArray aSources, in nsIRDFResource aCommand, in nsISupportsArray aArguments); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::DoCommand(nsISupportsArray * aSources, nsIRDFResource *aCommand, nsISupportsArray * aArguments)
{
return NS_RDF_NO_VALUE;
}
/* void beginUpdateBatch (); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::BeginUpdateBatch()
{
return NS_OK;
}
/* void endUpdateBatch (); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::EndUpdateBatch()
{
return NS_OK;
}
nsresult
NS_NewRDFDataSourceDataSource(nsISupports *, const nsIID& iid,
void ** result)
{
nsRDFDataSourceDataSource * dsds = new nsRDFDataSourceDataSource();
if (!dsds) return NS_ERROR_NOT_INITIALIZED;
return dsds->QueryInterface(iid, result);
}