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package org.mule.devkit.model.code;
import java.util.HashSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utility methods that convert arbitrary strings into Java identifiers.
*/
public class JavaName {
/**
* Checks if a given string is usable as a Java identifier.
*/
public static boolean isJavaIdentifier(String s) {
if (s.length() == 0) {
return false;
}
if (reservedKeywords.contains(s)) {
return false;
}
if (!Character.isJavaIdentifierStart(s.charAt(0))) {
return false;
}
for (int i = 1; i < s.length(); i++) {
if (!Character.isJavaIdentifierPart(s.charAt(i))) {
return false;
}
}
return true;
}
/**
* Checks if the given string is a valid fully qualified name.
*/
public static boolean isFullyQualifiedClassName(String s) {
return isJavaPackageName(s);
}
/**
* Checks if the given string is a valid Java package name.
*/
public static boolean isJavaPackageName(String s) {
while (s.length() != 0) {
int idx = s.indexOf('.');
if (idx == -1) {
idx = s.length();
}
if (!isJavaIdentifier(s.substring(0, idx))) {
return false;
}
s = s.substring(idx);
if (s.length() != 0) {
s = s.substring(1); // remove '.'
}
}
return true;
}
/**
* <b>Experimental API:</b> converts an English word into a plural form.
*
* @param word a word, such as "child", "apple". Must not be null.
* It accepts word concatanation forms
* that are common in programming languages, such as "my_child", "MyChild",
* "myChild", "MY-CHILD", "CODE003-child", etc, and mostly tries to do the right thing.
* ("my_children","MyChildren","myChildren", and "MY-CHILDREN", "CODE003-children" respectively)
* <p/>
* Although this method only works for English words, it handles non-English
* words gracefully (by just returning it as-is.) For example, 日本語
* will be returned as-is without modified, not "日本語s"
* <p/>
* This method doesn't handle suffixes very well. For example, passing
* "person56" will return "person56s", not "people56".
* @return always non-null.
*/
public static String getPluralForm(String word) {
// remember the casing of the word
boolean allUpper = true;
// check if the word looks like an English word.
// if we see non-ASCII characters, abort
for (int i = 0; i < word.length(); i++) {
char ch = word.charAt(i);
if (ch >= 0x80) {
return word;
}
// note that this isn't the same as allUpper &= Character.isUpperCase(ch);
allUpper &= !Character.isLowerCase(ch);
}
for (Entry e : TABLE) {
String r = e.apply(word);
if (r != null) {
if (allUpper) {
r = r.toUpperCase();
}
return r;
}
}
// failed
return word;
}
/**
* All reserved keywords of Java.
*/
private static HashSet<String> reservedKeywords = new HashSet<String>();
static {
// see http://java.sun.com/docs/books/tutorial/java/nutsandbolts/_keywords.html
String[] words = new String[]{
"abstract",
"boolean",
"break",
"byte",
"case",
"catch",
"char",
"class",
"const",
"continue",
"default",
"do",
"double",
"else",
"extends",
"final",
"finally",
"float",
"for",
"goto",
"if",
"implements",
"import",
"instanceof",
"int",
"interface",
"long",
"native",
"new",
"package",
"private",
"protected",
"public",
"return",
"short",
"static",
"strictfp",
"super",
"switch",
"synchronized",
"this",
"throw",
"throws",
"transient",
"try",
"void",
"volatile",
"while",
// technically these are not reserved words but they cannot be used as identifiers.
"true",
"false",
"null",
// and I believe assert is also a new keyword
"assert",
// and 5.0 keywords
"enum"
};
for (String w : words) {
reservedKeywords.add(w);
}
}
private static class Entry {
private final Pattern pattern;
private final String replacement;
public Entry(String pattern, String replacement) {
this.pattern = Pattern.compile(pattern, Pattern.CASE_INSENSITIVE);
this.replacement = replacement;
}
String apply(String word) {
Matcher m = pattern.matcher(word);
if (m.matches()) {
StringBuffer buf = new StringBuffer();
m.appendReplacement(buf, replacement);
return buf.toString();
} else {
return null;
}
}
}
private static final Entry[] TABLE;
static {
String[] source = {
"(.*)child", "$1children",
"(.+)fe", "$1ves",
"(.*)mouse", "$1mise",
"(.+)f", "$1ves",
"(.+)ch", "$1ches",
"(.+)sh", "$1shes",
"(.*)tooth", "$1teeth",
"(.+)um", "$1a",
"(.+)an", "$1en",
"(.+)ato", "$1atoes",
"(.*)basis", "$1bases",
"(.*)axis", "$1axes",
"(.+)is", "$1ises",
"(.+)ss", "$1sses",
"(.+)us", "$1uses",
"(.+)s", "$1s",
"(.*)foot", "$1feet",
"(.+)ix", "$1ixes",
"(.+)ex", "$1ices",
"(.+)nx", "$1nxes",
"(.+)x", "$1xes",
"(.+)y", "$1ies",
"(.+)", "$1s",
};
TABLE = new Entry[source.length / 2];
for (int i = 0; i < source.length; i += 2) {
TABLE[i / 2] = new Entry(source[i], source[i + 1]);
}
}
}