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 com.google.common.annotations.Beta;
11 import com.google.common.base.Preconditions;
12 import com.google.common.base.Splitter;
13 import java.util.Iterator;
14 import java.util.function.Function;
15 import org.opendaylight.yangtools.yang.common.QName;
16 import org.opendaylight.yangtools.yang.common.QNameModule;
19 * Utility methods for parsing and writing QNames.
21 * @author Robert Varga
24 public final class QNameCodecUtil {
25 private static final Splitter COLON_SPLITTER = Splitter.on(':').trimResults();
27 public static QName decodeQName(final String str, final Function<String, QNameModule> prefixToModule) {
28 final Iterator<String> it = COLON_SPLITTER.split(str).iterator();
31 final String identifier;
34 final String first = it.next();
36 // It is "prefix:value"
38 identifier = it.next();
39 Preconditions.checkArgument(!it.hasNext(), "Malformed QName '" + str + "'");
49 final QNameModule module = prefixToModule.apply(prefix);
50 Preconditions.checkArgument(module != null, "Cannot resolve prefix '%s' from %s", prefix, str);
51 return QName.create(module, identifier);
54 public static String encodeQName(final QName qname, final Function<QNameModule, String> moduleToPrefix) {
55 final String prefix = moduleToPrefix.apply(qname.getModule());
56 Preconditions.checkArgument(prefix != null, "Cannot allocated prefix for %s", qname);
57 return prefix.isEmpty() ? qname.getLocalName() : prefix + ":" + qname.getLocalName();