Package Utils
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.StringTokenizer;
public final class PackageUtils {
private static final Set<String> KEYWORDS = new HashSet<String>(Arrays
.asList(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", "true", "false", "null", "assert", "enum"}));
private PackageUtils() {
}
static String getPackageName(String className) {
int pos = className.lastIndexOf('.');
if (pos != -1) {
return className.substring(0, pos);
} else {
return "";
}
}
public static String getPackageName(Class<?> clazz) {
String className = clazz.getName();
if (className.startsWith("[L")) {
className = className.substring(2);
}
return getPackageName(className);
}
public static String parsePackageName(String namespace, String defaultPackageName) {
String packageName = (defaultPackageName != null && defaultPackageName.trim().length() > 0)
? defaultPackageName : null;
if (packageName == null) {
packageName = getPackageNameByNameSpaceURI(namespace);
}
return packageName;
}
public static String getPackageNameByNameSpaceURI(String nameSpaceURI) {
int idx = nameSpaceURI.indexOf(':');
String scheme = "";
if (idx >= 0) {
scheme = nameSpaceURI.substring(0, idx);
if ("http".equalsIgnoreCase(scheme) || "urn".equalsIgnoreCase(scheme)) {
nameSpaceURI = nameSpaceURI.substring(idx + 1);
}
}
List<String> tokens = tokenize(nameSpaceURI, "/: ");
if (tokens.size() == 0) {
return null;
}
if (tokens.size() > 1) {
String lastToken = tokens.get(tokens.size() - 1);
idx = lastToken.lastIndexOf('.');
if (idx > 0) {
lastToken = lastToken.substring(0, idx);
tokens.set(tokens.size() - 1, lastToken);
}
}
String domain = tokens.get(0);
idx = domain.indexOf(':');
if (idx >= 0) {
domain = domain.substring(0, idx);
}
List<String> r = reverse(tokenize(domain, "urn".equals(scheme) ? ".-" : "."));
if ("www".equalsIgnoreCase(r.get(r.size() - 1))) {
// remove leading www
r.remove(r.size() - 1);
}
// replace the domain name with tokenized items
tokens.addAll(1, r);
tokens.remove(0);
// iterate through the tokens and apply xml->java name algorithm
for (int i = 0; i < tokens.size(); i++) {
// get the token and remove illegal chars
String token = tokens.get(i);
token = removeIllegalIdentifierChars(token);
// this will check for reserved keywords
if (containsReservedKeywords(token)) {
token = '_' + token;
}
tokens.set(i, token.toLowerCase());
}
// concat all the pieces and return it
return combine(tokens, '.');
}
private static List<String> tokenize(String str, String sep) {
StringTokenizer tokens = new StringTokenizer(str, sep);
List<String> r = new ArrayList<String>();
while (tokens.hasMoreTokens()) {
r.add(tokens.nextToken());
}
return r;
}
private static <T> List<T> reverse(List<T> a) {
List<T> r = new ArrayList<T>();
for (int i = a.size() - 1; i >= 0; i--) {
r.add(a.get(i));
}
return r;
}
private static String removeIllegalIdentifierChars(String token) {
StringBuffer newToken = new StringBuffer();
for (int i = 0; i < token.length(); i++) {
char c = token.charAt(i);
if (i == 0 && !Character.isJavaIdentifierStart(c)) {
// prefix an '_' if the first char is illegal
newToken.append("_" + c);
} else if (!Character.isJavaIdentifierPart(c)) {
// replace the char with an '_' if it is illegal
newToken.append('_');
} else {
// add the legal char
newToken.append(c);
}
}
return newToken.toString();
}
private static String combine(List r, char sep) {
StringBuilder buf = new StringBuilder(r.get(0).toString());
for (int i = 1; i < r.size(); i++) {
buf.append(sep);
buf.append(r.get(i));
}
return buf.toString();
}
private static boolean containsReservedKeywords(String token) {
return KEYWORDS.contains(token);
}
public static String getNamespace(String packageName) {
if (packageName == null || packageName.length() == 0) {
return null;
}
StringTokenizer tokenizer = new StringTokenizer(packageName, ".");
String[] tokens;
if (tokenizer.countTokens() == 0) {
tokens = new String[0];
} else {
tokens = new String[tokenizer.countTokens()];
for (int i = tokenizer.countTokens() - 1; i >= 0; i--) {
tokens[i] = tokenizer.nextToken();
}
}
StringBuffer namespace = new StringBuffer("http://");
String dot = "";
for (int i = 0; i < tokens.length; i++) {
if (i == 1) {
dot = ".";
}
namespace.append(dot + tokens[i]);
}
namespace.append('/');
return namespace.toString();
}
}
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