2 * Copyright (c) 2017 Cisco Systems, Inc. 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.mdsal.binding.javav2.generator.util;
10 import com.google.common.annotations.Beta;
11 import com.google.common.collect.ArrayListMultimap;
12 import com.google.common.collect.ImmutableSet;
13 import com.google.common.collect.ListMultimap;
14 import java.util.List;
16 import org.apache.commons.lang3.StringUtils;
17 import org.opendaylight.mdsal.binding.javav2.model.api.Enumeration;
18 import org.opendaylight.mdsal.binding.javav2.model.api.Enumeration.Pair;
19 import org.opendaylight.mdsal.binding.javav2.util.BindingMapping;
22 * This util class converts every non-java char in identifier to java char by
23 * its unicode name (<a href=
24 * "http://docs.oracle.com/javase/specs/jls/se8/html/jls-3.html#jls-3.8">JAVA SE
25 * SPECIFICATIONS - Identifiers</a>). There are special types of mapping
26 * non-java chars to original identifiers according to specific
27 * {@linkplain JavaIdentifier java type}:
29 * <li>class, enum, interface</li>
32 * <li>without special separator</li>
33 * <li>the first character of identifier, any other first character of
34 * identifier part mapped by non-Java char name from unicode and char in
35 * identifier behind non-java char name are converting to upper case</li>
39 * <li>example* - ExampleAsterisk</li>
40 * <li>example*example - ExampleAserisksExample</li>
41 * <li>\example - ReverseSolidusExample</li>
42 * <li>1example - DigitOneExample</li>
43 * <li>example1 - Example1</li>
44 * <li>int - IntReservedKeyword</li>
45 * <li>con - ConReservedKeyword</li>
50 * <li>enum value, constant</li>
53 * <li>used underscore as special separator</li>
54 * <li>converted identifier to upper case</li>
58 * <li>example* - EXAMPLE_ASTERISK</li>
59 * <li>example*example - EXAMPLE_ASTERISK_EXAMPLE</li>
60 * <li>\example - REVERSE_SOLIDUS_EXAMPLE</li>
61 * <li>1example - DIGIT_ONE_EXAMPLE</li>
62 * <li>example1 - EXAMPLE1</li>
63 * <li>int - INT_RESERVED_KEYWORD</li>
64 * <li>con - CON_RESERVED_KEYWORD</li>
69 * <li>method, variable</li>
73 * <li>without special separator</li>
74 * <li>the first character of identifier is converting to lower case</li>
75 * <li>any other first character of identifier part mapped by non-Java char name
76 * from unicode and char in identifier behind non-java char name are converting
81 * <li>example* - exampleAsterisk</li>
82 * <li>example*example - exampleAserisksExample</li>
83 * <li>\example - reverseSolidusExample</li>
84 * <li>1example - digitOneExample</li>
85 * <li>example1 - example1</li>
86 * <li>int - intReservedKeyword</li>
87 * <li>con - conReservedKeyword</li>
92 * <li>package - full package name (<a href=
93 * "https://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html">
94 * Naming a package</a>)</li>
98 * <li>parts of package name are separated by dots</li>
99 * <li>parts of package name are converting to lower case</li>
100 * <li>if parts of package name are reserved Java or Windows keywords, such as
101 * 'int' the suggested convention is to add an underscore to keyword</li>
102 * <li>dash is parsed as underscore according to <a href=
103 * "https://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html">
104 * Naming a package</a></li>
108 * <li>org.example* - org.exampleasterisk</li>
109 * <li>org.example*example - org.exampleasteriskexample</li>
110 * <li>org.\example - org.reversesolidusexample</li>
111 * <li>org.1example - org.digitoneexample</li>
112 * <li>org.example1 - org.example1</li>
113 * <li>org.int - org.int_</li>
114 * <li>org.con - org.con_</li>
115 * <li>org.foo-cont - org.foo_cont</li>
122 * There is special case in CLASS, INTERFACE, ENUM, ENUM VALUE, CONSTANT, METHOD
123 * and VARIABLE if identifier contains single dash - then the converter ignores
124 * the single dash in the way of the non-java chars. In other way, if dash is
125 * the first or the last char in the identifier or there is more dashes in a row
126 * in the identifier, then these dashes are converted as non-java chars.
129 * <li>class, enum, interface</li>
132 * <li>foo-cont - FooCont</li>
133 * <li>foo--cont - FooHyphenMinusHyphenMinusCont</li>
134 * <li>-foo - HyphenMinusFoo</li>
135 * <li>foo- - FooHyphenMinus</li>
138 * <li>enum value, constant
141 * <li>foo-cont - FOO_CONT</li>
142 * <li>foo--cont - FOO_HYPHEN_MINUS_HYPHEN_MINUS_CONT</li>
143 * <li>-foo - HYPHEN_MINUS_FOO</li>
144 * <li>foo- - FOO_HYPHEN_MINUS</li>
147 * <li>method, variable</li>
150 * <li>foo-cont - fooCont</li>
151 * <li>foo--cont - fooHyphenMinusHyphenMinusCont</li>
152 * <li>-foo - hyphenMinusFoo</li>
153 * <li>foo- - fooHyphenMinus</li>
158 * Next special case talks about normalizing class name which already exists in
159 * package - but with different camel cases (foo, Foo, fOo, ...). To every next
160 * classes with same names will by added their actual rank (serial number),
161 * except the first one. This working for CLASS, ENUM and INTEFACE java
162 * identifiers. If there exist the same ENUM VALUES in ENUM (with different
163 * camel cases), then it's parsed with same logic like CLASSES, ENUMS and
164 * INTERFACES but according to list of pairs of their ENUM parent. Example:
167 * <li>class, enum, interface</li>
170 * <li>package name org.example, class (or interface or enum) Foo - normalized
172 * <li>package name org.example, class (or interface or enum) fOo - normalized
176 * <li>enum value</li>
189 * <li>YANG enum values will be mapped to 'FOO' and 'FOO_1' Java enum
196 public final class JavaIdentifierNormalizer {
198 private static final int FIRST_CHAR = 0;
199 private static final int FIRST_INDEX = 1;
200 private static final char UNDERSCORE = '_';
201 private static final char DASH = '-';
202 private static final String EMPTY_STRING = "";
203 private static final String RESERVED_KEYWORD = "reserved_keyword";
204 private static final ListMultimap<String, String> PACKAGES_MAP = ArrayListMultimap.create();
205 public static final Set<String> SPECIAL_RESERVED_PATHS =
206 ImmutableSet.of("org.opendaylight.yangtools.yang.model","org.opendaylight.yangtools.concepts","org.opendaylight.yangtools.yang.common",
207 "org.opendaylight.mdsal.binding.javav2.spec","java", "com");
209 private JavaIdentifierNormalizer() {
210 throw new UnsupportedOperationException("Util class");
215 * According to <a href="https://tools.ietf.org/html/rfc7950#section-9.6.4">YANG RFC 7950</a>,
216 * all assigned names in an enumeration MUST be unique. Created names are contained in the list
217 * of {@link Enumeration.Pair}. This method adds actual index with underscore behind name of new
218 * enum value only if this name already exists in one of the list of {@link Enumeration.Pair}.
219 * Then, the name will be converted to java chars according to {@link JavaIdentifier#ENUM_VALUE}
231 * YANG enum values will be mapped to 'FOO' and 'FOO_1' Java enum values.
234 * - name of new enum value
236 * - list of all actual enum values
237 * @return converted and fixed name of new enum value
239 public static String normalizeEnumValueIdentifier(final String name, final List<Pair> values) {
240 return convertIdentifierEnumValue(name, name, values, FIRST_INDEX);
244 * Normalizing full package name by non java chars and reserved keywords.
246 * @param fullPackageName
247 * - full package name
248 * @return normalized name
250 public static String normalizeFullPackageName(final String fullPackageName) {
251 final String[] packageNameParts = fullPackageName.split("\\.");
252 final StringBuilder sb = new StringBuilder();
253 for (int i = 0; i < packageNameParts.length; i++) {
254 String normalizedPartialPackageName = normalizePartialPackageName(packageNameParts[i]);
256 // check if fullPackageName contains class name at the end and
257 // capitalize last part of normalized package name
258 if (packageNameParts.length != 1 && i == packageNameParts.length - 1
259 && Character.isUpperCase(packageNameParts[i].charAt(FIRST_CHAR))) {
260 normalizedPartialPackageName = StringUtils.capitalize(normalizedPartialPackageName);
263 sb.append(normalizedPartialPackageName);
265 if (i != (packageNameParts.length - 1)) {
269 return sb.toString();
273 * Normalizing part of package name by non java chars.
275 * @param packageNamePart
276 * - part of package name
277 * @return normalized name
279 public static String normalizePartialPackageName(final String packageNamePart) {
280 // if part of package name consist from java or windows reserved word, return it with
281 // underscore at the end and in lower case
282 if (BindingMapping.JAVA_RESERVED_WORDS.contains(packageNamePart.toLowerCase())
283 || BindingMapping.WINDOWS_RESERVED_WORDS.contains(packageNamePart.toUpperCase())) {
284 return new StringBuilder(packageNamePart).append(UNDERSCORE).toString().toLowerCase();
286 String normalizedPackageNamePart = packageNamePart;
287 if (packageNamePart.contains(String.valueOf(DASH))) {
288 normalizedPackageNamePart = packageNamePart.replaceAll(String.valueOf(DASH), String.valueOf(UNDERSCORE));
290 final StringBuilder sb = new StringBuilder();
291 StringBuilder innserSb = new StringBuilder();
292 for (int i = 0; i < normalizedPackageNamePart.length(); i++) {
293 if (normalizedPackageNamePart.charAt(i) == UNDERSCORE) {
294 if (!innserSb.toString().isEmpty()) {
295 sb.append(normalizeSpecificIdentifier(innserSb.toString(), JavaIdentifier.PACKAGE));
296 innserSb = new StringBuilder();
298 sb.append(UNDERSCORE);
300 innserSb.append(normalizedPackageNamePart.charAt(i));
303 if (!innserSb.toString().isEmpty()) {
304 sb.append(normalizeSpecificIdentifier(innserSb.toString(), JavaIdentifier.PACKAGE));
306 // returned normalized part of package name
307 return sb.toString();
311 * Find and convert non Java chars in identifiers of generated transfer objects, initially
312 * derived from corresponding YANG according to
313 * <a href="http://docs.oracle.com/javase/specs/jls/se8/html/jls-3.html#jls-3.8"> Java
314 * Specifications - Identifiers</a>. If there is more same class names at the same package, then
315 * append rank (serial number) to the end of them. Works for class, enum, interface.
318 * - package of identifier
320 * - name of identifier
321 * @return - java acceptable identifier
323 public static String normalizeClassIdentifier(final String packageName, final String className) {
324 for (final String reservedPath : SPECIAL_RESERVED_PATHS) {
325 if (packageName.startsWith(reservedPath)) {
329 final String convertedClassName = normalizeSpecificIdentifier(className, JavaIdentifier.CLASS);
330 // if packageName contains class name at the end, then the className is
331 // name of inner class
332 final String[] packageNameParts = packageName.split("\\.");
333 String suppInnerClassPackageName = packageName;
334 if (packageNameParts.length > 1) {
335 if (Character.isUpperCase(packageNameParts[packageNameParts.length - 1].charAt(FIRST_CHAR))) {
336 final StringBuilder sb = new StringBuilder();
337 // ignore class name in package name - inner class name has
338 // to be normalizing according to original package of parent
340 for (int i = 0; i < packageNameParts.length - 1; i++) {
341 sb.append(packageNameParts[i]);
342 if (i != (packageNameParts.length - 2)) {
346 suppInnerClassPackageName = sb.toString();
350 return normalizeClassIdentifier(suppInnerClassPackageName, convertedClassName, convertedClassName, FIRST_INDEX);
354 * Find and convert non Java chars in identifiers of generated transfer objects, initially
355 * derived from corresponding YANG.
358 * - name of identifier
359 * @param javaIdentifier
360 * - java type of identifier
361 * @return - java acceptable identifier
363 public static String normalizeSpecificIdentifier(final String identifier, final JavaIdentifier javaIdentifier) {
364 final StringBuilder sb = new StringBuilder();
366 // if identifier isn't PACKAGE type then check it by reserved keywords
367 if(javaIdentifier != JavaIdentifier.PACKAGE) {
368 if (BindingMapping.JAVA_RESERVED_WORDS.contains(identifier.toLowerCase())
369 || BindingMapping.WINDOWS_RESERVED_WORDS.contains(identifier.toUpperCase())) {
370 return fixCasesByJavaType(
371 sb.append(identifier).append(UNDERSCORE).append(RESERVED_KEYWORD).toString().toLowerCase(),
376 // check and convert first char in identifier if there is non-java char
377 final char firstChar = identifier.charAt(FIRST_CHAR);
378 if (!Character.isJavaIdentifierStart(firstChar)) {
379 // converting first char of identifier
380 sb.append(convertFirst(firstChar, existNext(identifier, FIRST_CHAR)));
382 sb.append(firstChar);
384 // check and convert other chars in identifier, if there is non-java char
385 for (int i = 1; i < identifier.length(); i++) {
386 final char actualChar = identifier.charAt(i);
387 // ignore single dash as non java char - if there is more dashes in a row or dash is as
388 // the last char in identifier then parse these dashes as non java chars
389 if ((actualChar == '-') && existNext(identifier, i)) {
390 if ((identifier.charAt(i - 1) != DASH) && (identifier.charAt(i + 1) != DASH)) {
391 sb.append(UNDERSCORE);
395 if (!Character.isJavaIdentifierPart(actualChar)) {
396 // prepare actual string of sb for checking if underscore exist on position of the
398 final String partialConvertedIdentifier = sb.toString();
399 sb.append(convert(actualChar, existNext(identifier, i),
400 partialConvertedIdentifier.charAt(partialConvertedIdentifier.length() - 1)));
402 sb.append(actualChar);
405 // apply camel case in appropriate way
406 return fixCasesByJavaType(sb.toString().replace("__", "_").toLowerCase(), javaIdentifier);
410 * Checking while there doesn't exist any class name with the same name
411 * (regardless of camel cases) in package.
414 * - package of class name
415 * @param origClassName
416 * - original class name
417 * @param actualClassName
418 * - actual class name with rank (serial number)
420 * - actual rank (serial number)
421 * @return converted identifier
423 private static String normalizeClassIdentifier(final String packageName, final String origClassName,
424 final String actualClassName, final int rank) {
425 if (PACKAGES_MAP.containsKey(packageName)) {
426 for (final String existingName : PACKAGES_MAP.get(packageName)) {
427 if (existingName.toLowerCase().equals(actualClassName.toLowerCase())) {
428 final int nextRank = rank + 1;
429 return normalizeClassIdentifier(packageName, origClassName,
430 new StringBuilder(origClassName).append(rank).toString(), nextRank);
434 PACKAGES_MAP.put(packageName, actualClassName);
435 return actualClassName;
439 * Fix cases of converted identifiers by Java type
442 * - converted identifier
443 * @param javaIdentifier
444 * - java type of identifier
445 * @return converted identifier with right cases according to java type
447 private static String fixCasesByJavaType(final String convertedIdentifier, final JavaIdentifier javaIdentifier) {
448 switch (javaIdentifier) {
452 return capitalize(fixCases(convertedIdentifier));
455 return convertedIdentifier.toUpperCase();
458 return fixCases(convertedIdentifier);
460 return convertedIdentifier.replaceAll(String.valueOf(UNDERSCORE), EMPTY_STRING);
462 throw new IllegalArgumentException("Unknown java type of identifier : " + javaIdentifier.toString());
467 * Delete unnecessary chars in converted identifier and apply camel case in appropriate way.
469 * @param convertedIdentifier
470 * - original converted identifier
471 * @return resolved identifier
473 private static String fixCases(final String convertedIdentifier) {
474 final StringBuilder sb = new StringBuilder();
475 if (convertedIdentifier.contains(String.valueOf(UNDERSCORE))) {
476 boolean isFirst = true;
477 for (final String part : convertedIdentifier.split(String.valueOf(UNDERSCORE))) {
482 sb.append(capitalize(part));
486 sb.append(convertedIdentifier);
488 return sb.toString();
492 * Check if there exist next char in identifier behind actual char position
495 * - original identifier
497 * - actual char position
498 * @return true if there is another char, false otherwise
500 private static boolean existNext(final String identifier, final int actual) {
501 return (identifier.length() - 1) < (actual + 1) ? false : true;
505 * Converting first char of identifier. This happen only if this char is
511 * - existing of next char behind actual char
512 * @return converted char
514 private static String convertFirst(final char c, final boolean existNext) {
515 String name = Character.getName(c);
516 if (name.contains(String.valueOf(DASH))) {
517 name = name.replaceAll(String.valueOf(DASH), String.valueOf(UNDERSCORE));
519 name = existNext ? (name + "_") : name;
520 return name.contains(" ") ? name.replaceAll(" ", "_") : name;
524 * Converting any char in java identifier, This happen only if this char is
530 * - existing of next char behind actual char
531 * @param partialLastChar
532 * - last char of partial converted identifier
533 * @return converted char
535 private static String convert(final char c, final boolean existNext, final char partialLastChar) {
536 return partialLastChar == '_' ? convertFirst(c, existNext) : "_" + convertFirst(c, existNext);
540 * Capitalize input string
543 * - string to be capitalized
545 private static String capitalize(final String identifier) {
546 return identifier.substring(FIRST_CHAR, FIRST_CHAR + 1).toUpperCase() + identifier.substring(1);
549 private static String convertIdentifierEnumValue(final String name, final String origName, final List<Pair> values,
551 String newName = name;
552 for (final Pair pair : values) {
553 if (pair.getName().toLowerCase().equals(name.toLowerCase())
554 || pair.getMappedName().toLowerCase().equals(name.toLowerCase())) {
555 int actualRank = rank;
556 final StringBuilder actualNameBuilder =
557 new StringBuilder(origName).append(UNDERSCORE).append(actualRank);
558 newName = convertIdentifierEnumValue(actualNameBuilder.toString(), origName, values, ++actualRank);
561 return normalizeSpecificIdentifier(newName, JavaIdentifier.ENUM_VALUE);