2 * Copyright (c) 2017 Pantheon Technologies, s.r.o. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.yangtools.yang.data.util.codec;
10 import static com.google.common.base.Preconditions.checkArgument;
12 import com.google.common.annotations.Beta;
13 import com.google.common.base.Splitter;
14 import java.util.Iterator;
15 import java.util.function.Function;
16 import org.opendaylight.yangtools.yang.common.QName;
17 import org.opendaylight.yangtools.yang.common.QNameModule;
20 * Utility methods for parsing and writing QNames.
22 * @author Robert Varga
25 public final class QNameCodecUtil {
26 private static final Splitter COLON_SPLITTER = Splitter.on(':').trimResults();
28 private QNameCodecUtil() {
32 public static QName decodeQName(final String str, final Function<String, QNameModule> prefixToModule) {
33 final Iterator<String> it = COLON_SPLITTER.split(str).iterator();
36 final String identifier;
39 final String first = it.next();
41 // It is "prefix:value"
43 identifier = it.next();
44 checkArgument(!it.hasNext(), "Malformed QName '%s'", str);
54 final QNameModule module = prefixToModule.apply(prefix);
55 checkArgument(module != null, "Cannot resolve prefix '%s' from %s", prefix, str);
56 return QName.create(module, identifier);
59 public static String encodeQName(final QName qname, final Function<QNameModule, String> moduleToPrefix) {
60 final String prefix = moduleToPrefix.apply(qname.getModule());
61 checkArgument(prefix != null, "Cannot allocated prefix for %s", qname);
62 return prefix.isEmpty() ? qname.getLocalName() : prefix + ":" + qname.getLocalName();