AGUtils.java
package com.franz.agbase.examples;
import com.franz.agbase.*;
/**
* Demonstrates some basics of using TriplesIterators and ValueSetIterators
* and showing results.
*
* This is a general utility class with no main method.
*
*/
public class AGUtils {
/**
* A default limit on the number of triples to show, to avoid showing
* overwhelmingly many.
*/
private static int showLimit = 100;
public static void showTriples(String msg, TriplesIterator it) throws AllegroGraphException {
System.out.println(msg);
showTriples(it);
}
public static void showTriples(TriplesIterator it) throws AllegroGraphException {
showTriples(it, showLimit);
}
public static void showTriples(TriplesIterator it, int limit) throws AllegroGraphException {
int i=0;
while (i<limit && it.step()) {
showTriple(it.getTriple());
i++;
}
if (it.step()) {
System.out.println("[Showing " + limit + " triples, there are more]");
}
}
public static void showTriple(Triple tr) throws AllegroGraphException {
System.out.println(tr.toString());
}
public static void showResults(ValueSetIterator it) throws AllegroGraphException {
String[] var = it.getNames();
System.out.println("Number of solutions: " + it.getCount());
for (int i=0; it.hasNext(); i++) {
ValueObject[] objects = it.next();
System.out.println("Solution " + (i+1) + ":");
for (int j = 0; j < objects.length; j++) {
ValueObject term = objects[j];
System.out.println(" " + var[j] + " = " + printValueObject(term));
}
}
}
public static String printValueObject(ValueObject o) {
String result;
if (o == null) {
result = "Null";
} else if (o instanceof LiteralNode) {
LiteralNode l = (LiteralNode)o;
result = l.getLabel();
} else if (o instanceof BlankNode) {
BlankNode b = (BlankNode)o;
result = b.getID();
} else if (o instanceof ValueNode) {
ValueNode n = (ValueNode)o;
result = n.toString();
} else {
result = o.toString();
}
return result;
}
public static void showURI (URINode r) {
System.out.println(r.getURI() + ":");
System.out.println(" Namespace: " + r.getNamespace());
System.out.println(" LocalName: " + r.getLocalName());
}
public static void showLiteral (LiteralNode lit) {
System.out.println("Literal: " + lit.toString());
System.out.println(" Label: " + lit.getLabel());
System.out.println(" Datatype: " + lit.getDatatype());
System.out.println(" Language: " + lit.getLanguage());
// Note that only Literals added to the store have a UPI
System.out.println(" UPI: " + ((ValueNode)lit).queryAGId());
}
public static void showEncodedLiteral (EncodedLiteral lit) {
System.out.println("EncodedLiteral: " + lit.toString());
System.out.println(" Label: " + lit.getLabel());
System.out.println(" Datatype: " + lit.getDatatype());
System.out.println(" Language: " + lit.getLanguage());
// Note that only Literals added to the store have a UPI
System.out.println(" UPI: " + ((ValueNode)lit).queryAGId());
}
public static void printObjectArray(String msg, Object[] objArr) {
System.out.println(msg);
if (objArr != null) {
for (int i=0; i<objArr.length;i++) {
System.out.println(" "+i+": "+objArr[i]);
}
}
}
public static void printUPIArray(String msg, AllegroGraph ts, UPI[] objArr) throws AllegroGraphException {
System.out.println(msg);
if (objArr != null) {
for (int i=0; i<objArr.length;i++) {
String[] parts = ts.getParts(objArr[i]);
System.out.println(" "+i+": "+parts[1]);
}
}
}
public static String upiArrayToString(AllegroGraph ts, UPI[] objArr) throws AllegroGraphException {
StringBuffer buf = new StringBuffer();
if (objArr != null) {
buf.append("{");
for (int i=0; i<objArr.length;i++) {
String[] parts = ts.getParts(objArr[i]);
buf.append(parts[1]).append(" ");
}
buf.append("}");
}
return buf.toString();
}
public static void printStringArray(String msg, String[] objArr) {
System.out.println(msg);
if (objArr != null) {
for (int i=0; i<objArr.length;i++) {
System.out.println(" "+i+": "+objArr[i]);
}
}
}
public static String elapsedTime(long start) {
long total = System.currentTimeMillis() - start;
long min = total/60000;
long msec = total%60000;
double sec = msec/1000.0;
String report;
if (min > 0) {
report = min + ":" + sec + " minutes:seconds";
} else {
report = sec + " seconds";
}
return report;
}
}
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