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.parser.rfc7950.stmt;
10 import static org.opendaylight.yangtools.yang.common.YangConstants.RFC6020_YANG_NAMESPACE_STRING;
11 import static org.opendaylight.yangtools.yang.common.YangConstants.YANG_XPATH_FUNCTIONS_PREFIX;
13 import com.google.common.annotations.Beta;
14 import com.google.common.base.Splitter;
15 import com.google.common.collect.ImmutableBiMap;
16 import java.math.BigDecimal;
17 import java.util.ArrayList;
18 import java.util.List;
19 import java.util.regex.Matcher;
20 import java.util.regex.Pattern;
21 import javax.annotation.RegEx;
22 import javax.xml.xpath.XPath;
23 import javax.xml.xpath.XPathExpressionException;
24 import javax.xml.xpath.XPathFactory;
25 import org.eclipse.jdt.annotation.NonNull;
26 import org.opendaylight.yangtools.yang.common.QName;
27 import org.opendaylight.yangtools.yang.common.YangVersion;
28 import org.opendaylight.yangtools.yang.model.api.RevisionAwareXPath;
29 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
30 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
31 import org.opendaylight.yangtools.yang.model.api.stmt.UnresolvedNumber;
32 import org.opendaylight.yangtools.yang.model.util.RevisionAwareXPathImpl;
33 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
34 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
35 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
36 import org.slf4j.Logger;
37 import org.slf4j.LoggerFactory;
40 * Utility class for dealing with arguments encountered by StatementSupport classes. Note that using this class may
41 * result in thread-local state getting attached. To clean up this state, please invoke
42 * {@link #detachFromCurrentThread()} when appropriate.
45 public final class ArgumentUtils {
46 public static final Splitter PIPE_SPLITTER = Splitter.on('|').trimResults();
47 public static final Splitter TWO_DOTS_SPLITTER = Splitter.on("..").trimResults();
49 private static final Logger LOG = LoggerFactory.getLogger(ArgumentUtils.class);
52 private static final String YANG_XPATH_FUNCTIONS_STRING =
53 "(re-match|deref|derived-from(-or-self)?|enum-value|bit-is-set)([ \t\r\n]*)(\\()";
54 private static final Pattern YANG_XPATH_FUNCTIONS_PATTERN = Pattern.compile(YANG_XPATH_FUNCTIONS_STRING);
57 private static final String PATH_ABS_STR = "/[^/].*";
58 private static final Pattern PATH_ABS = Pattern.compile(PATH_ABS_STR);
59 private static final Splitter SLASH_SPLITTER = Splitter.on('/').omitEmptyStrings().trimResults();
61 // XPathFactory is not thread-safe, rather than locking around a shared instance, we use a thread-local one.
62 private static final ThreadLocal<XPathFactory> XPATH_FACTORY = new ThreadLocal<XPathFactory>() {
64 protected XPathFactory initialValue() {
65 return XPathFactory.newInstance();
69 // these objects are to compare whether range has MAX or MIN value
70 // none of these values should appear as Yang number according to spec so they are safe to use
71 private static final BigDecimal YANG_MIN_NUM = BigDecimal.valueOf(-Double.MAX_VALUE);
72 private static final BigDecimal YANG_MAX_NUM = BigDecimal.valueOf(Double.MAX_VALUE);
74 private ArgumentUtils() {
75 throw new UnsupportedOperationException();
78 public static int compareNumbers(final Number n1, final Number n2) {
79 final BigDecimal num1 = yangConstraintToBigDecimal(n1);
80 final BigDecimal num2 = yangConstraintToBigDecimal(n2);
81 return new BigDecimal(num1.toString()).compareTo(new BigDecimal(num2.toString()));
84 public static String internBoolean(final String input) {
85 if ("true".equals(input)) {
87 } else if ("false".equals(input)) {
94 public static @NonNull Boolean parseBoolean(final StmtContext<?, ?, ?> ctx, final String input) {
95 if ("true".equals(input)) {
97 } else if ("false".equals(input)) {
100 final StatementDefinition def = ctx.getPublicDefinition();
101 throw new SourceException(ctx.getStatementSourceReference(),
102 "Invalid '%s' statement %s '%s', it can be either 'true' or 'false'",
103 def.getStatementName(), def.getArgumentDefinition().get().getArgumentName(), input);
107 public static RevisionAwareXPath parseXPath(final StmtContext<?, ?, ?> ctx, final String path) {
108 final XPath xPath = XPATH_FACTORY.get().newXPath();
109 xPath.setNamespaceContext(StmtNamespaceContext.create(ctx,
110 ImmutableBiMap.of(RFC6020_YANG_NAMESPACE_STRING, YANG_XPATH_FUNCTIONS_PREFIX)));
112 final String trimmed = trimSingleLastSlashFromXPath(path);
114 // XPath extension functions have to be prefixed
115 // yang-specific XPath functions are in fact extended functions, therefore we have to add
116 // "yang" prefix to them so that they can be properly validated with the XPath.compile() method
117 // the "yang" prefix is bound to RFC6020 YANG namespace
118 final String prefixedXPath = addPrefixToYangXPathFunctions(trimmed, ctx);
119 // TODO: we could capture the result and expose its 'evaluate' method
120 xPath.compile(prefixedXPath);
121 } catch (final XPathExpressionException e) {
122 LOG.warn("Argument \"{}\" is not valid XPath string at \"{}\"", path, ctx.getStatementSourceReference(), e);
125 return new RevisionAwareXPathImpl(path, PATH_ABS.matcher(path).matches());
128 @SuppressWarnings("checkstyle:illegalCatch")
129 public static SchemaNodeIdentifier nodeIdentifierFromPath(final StmtContext<?, ?, ?> ctx, final String path) {
130 // FIXME: is the path trimming really necessary??
131 final List<QName> qNames = new ArrayList<>();
132 for (final String nodeName : SLASH_SPLITTER.split(trimSingleLastSlashFromXPath(path))) {
134 qNames.add(StmtContextUtils.parseNodeIdentifier(ctx, nodeName));
135 } catch (final RuntimeException e) {
136 throw new SourceException(ctx.getStatementSourceReference(), e,
137 "Failed to parse node '%s' in path '%s'", nodeName, path);
141 return SchemaNodeIdentifier.create(qNames, PATH_ABS.matcher(path).matches());
145 * Cleanup any resources attached to the current thread. Threads interacting with this class can cause thread-local
146 * caches to them. Invoke this method if you want to detach those resources.
148 public static void detachFromCurrentThread() {
149 XPATH_FACTORY.remove();
152 private static String addPrefixToYangXPathFunctions(final String path, final StmtContext<?, ?, ?> ctx) {
153 if (ctx.getRootVersion() == YangVersion.VERSION_1_1) {
154 // FIXME once Java 9 is available, change this to StringBuilder as Matcher.appendReplacement() and
155 // Matcher.appendTail() will accept StringBuilder parameter in Java 9
156 final StringBuffer result = new StringBuffer();
157 final String prefix = YANG_XPATH_FUNCTIONS_PREFIX + ":";
158 final Matcher matcher = YANG_XPATH_FUNCTIONS_PATTERN.matcher(path);
159 while (matcher.find()) {
160 matcher.appendReplacement(result, prefix + matcher.group());
163 matcher.appendTail(result);
164 return result.toString();
170 private static String trimSingleLastSlashFromXPath(final String path) {
171 return path.endsWith("/") ? path.substring(0, path.length() - 1) : path;
174 private static BigDecimal yangConstraintToBigDecimal(final Number number) {
175 if (UnresolvedNumber.max().equals(number)) {
178 if (UnresolvedNumber.min().equals(number)) {
182 return new BigDecimal(number.toString());