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Implement Change() and Move() on composite datasource. Realize that these interfaces are going to be a nightmare to do the right way.

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This commit is contained in:
waterson%netscape.com 1999-07-03 02:40:35 +00:00
parent 689199ce89
commit c6efb35f4a
1 changed files with 74 additions and 4 deletions
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78
rdf/base/src/nsCompositeDataSource.cpp
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@ -916,8 +916,43 @@ CompositeDataSourceImpl::Change(nsIRDFResource* aSource,
nsIRDFNode* aOldTarget,
nsIRDFNode* aNewTarget)
{
NS_NOTYETIMPLEMENTED("write me");
return NS_ERROR_NOT_IMPLEMENTED;
NS_PRECONDITION(aSource != nsnull, "null ptr");
if (! aSource)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aProperty != nsnull, "null ptr");
if (! aProperty)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aOldTarget != nsnull, "null ptr");
if (! aOldTarget)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aNewTarget != nsnull, "null ptr");
if (! aNewTarget)
return NS_ERROR_NULL_POINTER;
nsresult rv;
// XXX So we're assuming that a datasource _must_ accept the
// atomic change; i.e., we can't split it up across two
// datasources. That sucks.
// We iterate backwards from the last data source which was added
// ("the most remote") to the first ("the most local"), trying to
// apply the change in each.
for (PRInt32 i = mDataSources.Count() - 1; i >= 0; --i) {
nsIRDFDataSource* ds = NS_STATIC_CAST(nsIRDFDataSource*, mDataSources[i]);
rv = ds->Change(aSource, aProperty, aOldTarget, aNewTarget);
if (NS_RDF_ASSERTION_ACCEPTED == rv)
return rv;
if (NS_FAILED(rv))
return rv;
}
// nobody wanted to accept it
return NS_RDF_ASSERTION_REJECTED;
}
NS_IMETHODIMP
@ -926,8 +961,43 @@ CompositeDataSourceImpl::Move(nsIRDFResource* aOldSource,
nsIRDFResource* aProperty,
nsIRDFNode* aTarget)
{
NS_NOTYETIMPLEMENTED("write me");
return NS_ERROR_NOT_IMPLEMENTED;
NS_PRECONDITION(aOldSource != nsnull, "null ptr");
if (! aOldSource)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aNewSource != nsnull, "null ptr");
if (! aNewSource)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aProperty != nsnull, "null ptr");
if (! aProperty)
return NS_ERROR_NULL_POINTER;
NS_PRECONDITION(aTarget != nsnull, "null ptr");
if (! aTarget)
return NS_ERROR_NULL_POINTER;
nsresult rv;
// XXX So we're assuming that a datasource _must_ accept the
// atomic move; i.e., we can't split it up across two
// datasources. That sucks.
// We iterate backwards from the last data source which was added
// ("the most remote") to the first ("the most local"), trying to
// apply the assertion in each.
for (PRInt32 i = mDataSources.Count() - 1; i >= 0; --i) {
nsIRDFDataSource* ds = NS_STATIC_CAST(nsIRDFDataSource*, mDataSources[i]);
rv = ds->Move(aOldSource, aNewSource, aProperty, aTarget);
if (NS_RDF_ASSERTION_ACCEPTED == rv)
return rv;
if (NS_FAILED(rv))
return rv;
}
// nobody wanted to accept it
return NS_RDF_ASSERTION_REJECTED;
}