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JavaNames.java
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81 lines (75 loc) · 2.38 KB
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package act.internal.util;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* Licensed 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.
* #L%
*/
import org.osgl.util.E;
import org.osgl.util.S;
/**
* Provides utility methods relevant to Java names, e.g. package name validator etc
*/
public final class JavaNames {
/**
* Check if a given string is a valid java package or class name.
*
* This method use the technique documented in
* [this SO question](https://stackoverflow.com/questions/13557195/how-to-check-if-string-is-a-valid-class-identifier)
* with the following extensions:
*
* * if the string does not contain `.` then assume it is not a valid package or class name
*
* @param s
* the string to be checked
* @return
* `true` if `s` is a valid java package or class name
*/
public static boolean isPackageOrClassName(String s) {
if (S.blank(s)) {
return false;
}
S.List parts = S.fastSplit(s, ".");
if (parts.size() < 2) {
return false;
}
for (String part: parts) {
if (!Character.isJavaIdentifierStart(part.charAt(0))) {
return false;
}
for (int i = 1, len = part.length(); i < len; ++i) {
if (!Character.isJavaIdentifierPart(part.charAt(i))) {
return false;
}
}
}
return true;
}
/**
* Returns package name of a class
*
* @param clazz
* the class
* @return
* the package name of the class
*/
public static String packageNameOf(Class<?> clazz) {
String name = clazz.getName();
int pos = name.lastIndexOf('.');
E.unexpectedIf(pos < 0, "Class does not have package: " + name);
return name.substring(0, pos);
}
}