/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.tdb.nodetable;
import org.apache.jena.atlas.lib.StrUtils ;
import org.apache.jena.atlas.logging.Log ;
import com.hp.hpl.jena.graph.Node ;
import com.hp.hpl.jena.graph.NodeFactory ;
import com.hp.hpl.jena.rdf.model.AnonId ;
import com.hp.hpl.jena.shared.PrefixMapping ;
import com.hp.hpl.jena.sparql.sse.SSE ;
import com.hp.hpl.jena.sparql.sse.SSEParseException ;
import com.hp.hpl.jena.tdb.lib.NodeFmtLib ;
import com.hp.hpl.jena.tdb.lib.NodeLib ;
/** Utilities for encoding/decoding nodes as strings.
* Normally use a Nodec (byte buffers) instead.
*/
public class NodecLib
{
// Better sharing with NodecSSE
// Characters in IRIs that are illegal and cause SSE problems, but we wish to keep.
final private static char MarkerChar = '_' ;
final private static char[] invalidIRIChars = { MarkerChar , ' ' } ;
public static String encode(Node node) { return encode(node, null) ; }
public static String encode(Node node, PrefixMapping pmap)
{
if ( node.isBlank() )
// Raw label.
return "_:"+node.getBlankNodeLabel() ;
if ( node.isURI() )
{
// Pesky spaces
//throw new TDBException("Space found in URI: "+node) ;
String x = StrUtils.encodeHex(node.getURI(), '_', invalidIRIChars) ;
if ( x != node.getURI() )
node = NodeFactory.createURI(x) ;
}
return NodeFmtLib.serialize(node) ;
}
public static Node decode(String s) { return decode(s, null) ; }
public static Node decode(String s, PrefixMapping pmap)
{
if ( s.startsWith("_:") )
{
s = s.substring(2) ;
return NodeFactory.createAnon(new AnonId(s)) ;
}
if ( s.startsWith("<") )
{
s = s.substring(1,s.length()-1) ;
s = StrUtils.decodeHex(s, MarkerChar) ;
return NodeFactory.createURI(s) ;
}
try {
// SSE invocation is expensive (??).
// Try TokenizerText?
// Use for literals only.
Node n = SSE.parseNode(s, pmap) ;
return n ;
} catch (SSEParseException ex)
{
Log.fatal(NodeLib.class, "decode: Failed to parse: "+s) ;
throw ex ;
}
}
}