package net.fortytwo.ripple.query.commands;
import net.fortytwo.flow.Collector;
import net.fortytwo.ripple.RippleException;
import net.fortytwo.ripple.io.RipplePrintStream;
import net.fortytwo.ripple.model.ModelConnection;
import net.fortytwo.ripple.query.Command;
import net.fortytwo.ripple.query.QueryEngine;
import org.openrdf.model.Namespace;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* @author Joshua Shinavier (http://fortytwo.net)
*/
public class ShowPrefixesCmd extends Command {
public void execute(final QueryEngine qe, final ModelConnection mc)
throws RippleException {
final RipplePrintStream ps = qe.getPrintStream();
// Create a map of prefixes to names and find the longest prefix.
Map<String, String> prefixesToNames = new HashMap<String, String>();
Collector<Namespace> coll = new Collector<Namespace>();
mc.getNamespaces().writeTo(coll);
int max = 0;
int j = 0;
for (Object aColl : coll) {
Namespace ns = (Namespace) aColl;
prefixesToNames.put(ns.getPrefix(), ns.getName());
int len = (ns.getPrefix() + j).length();
if (len > max) {
max = len;
}
j++;
}
final int maxlen = max + 4;
// Alphabetize the prefixes.
String[] array = new String[prefixesToNames.size()];
prefixesToNames.keySet().toArray(array);
Arrays.sort(array);
ps.println("");
// Print the namespaces, aligning the name portions with one another.
int i = 0;
for (String prefix : array) {
String s = "[" + i++ + "] " + prefix + ":";
int len = s.length();
ps.print(s);
for (int l = 0; l < maxlen - len + 2; l++) {
ps.print(' ');
}
ps.print(prefixesToNames.get(prefix));
ps.print('\n');
}
ps.println("");
}
public String getName() {
return "show prefixes";
}
protected void abort() {
}
}