org.topbraid.jenax.util.PrefixUtils Maven / Gradle / Ivy
package org.topbraid.jenax.util;
import java.util.Map;
import org.apache.jena.graph.Graph;
import org.apache.jena.shared.PrefixMapping;
public class PrefixUtils {
/**
* Make the {@code dstGraph} prefix map the same {@code srcGraph} prefix map,
* only making chnages where necessary.
* @param dstGraph the destination graph
* @param srcGraph the source graph
* @return false if no changes where made.
*/
public static boolean alignPrefixMap(Graph dstGraph, Graph srcGraph) {
boolean changeMade1 = copyPrefixMap(dstGraph, srcGraph);
boolean changeMade2 = removeMissingPrefixes(dstGraph, srcGraph);
return changeMade1 | changeMade2 ;
}
/**
* Copy prefix mappings into {@code dstGraph} from {@code srcGraph},
* checking whether the prefix mapping is already set.
* @param dstGraph the destination graph
* @param srcGraph the source graph
* @return false if no changes where made.
*/
public static boolean copyPrefixMap(Graph dstGraph, Graph srcGraph) {
boolean changeMade = false;
PrefixMapping dstPM = dstGraph.getPrefixMapping();
PrefixMapping srcPM = srcGraph.getPrefixMapping();
// Copy different prefix mappings.
for (Map.Entry e : srcPM.getNsPrefixMap().entrySet()) {
if (!e.getValue().equals(dstPM.getNsPrefixURI(e.getKey()))) {
dstPM.setNsPrefix(e.getKey(), e.getValue());
changeMade = true;
}
}
return changeMade;
}
/**
* Remove prefix mappings from {@code dstGraph} that do not exist in {@code srcGraph}.
* @param dstGraph the destination graph
* @param srcGraph the source graph
* @return false if no changes where made.
*/
public static boolean removeMissingPrefixes(Graph dstGraph, Graph srcGraph) {
boolean changeMade = false;
PrefixMapping dstPM = dstGraph.getPrefixMapping();
PrefixMapping srcPM = srcGraph.getPrefixMapping();
// Delete those from dstPM that are not in srcPM
for(String prefix : dstPM.getNsPrefixMap().keySet()) {
if(srcPM.getNsPrefixURI(prefix) == null) {
dstPM.removeNsPrefix(prefix);
changeMade = true;
}
}
return changeMade;
}
}