src/main/java/org/intellimate/izou/sdk/resource/ListResourceProviderImpl.java
@Override
    public boolean containsResourcesFromSource(String sourceID) {
        return resources.stream()
                .map(ResourceModel::getResourceID)
                .anyMatch(source -> source.equals(sourceID));
    }
@Override
    public boolean containsResourcesFromSource(String sourceID) {
        return resources.stream()
                .map(ResourceModel::getResourceID)
                .anyMatch(source -> source.equals(sourceID));
    }
checks whether there are any resources registered from the source

@param sourceID the ID of the source
@return true if the container has resources from the source