Java Class Name Extract extractClassName(String javaSource)

Description

Extract the class name of the Java source code

License

Open Source License

Parameter

Parameter	Description
javaSource	String containing Java source code of a class

Exception

Parameter	Description
IllegalArgumentException	When the source code does not contains a class or is invalid

Declaration

public static String extractClassName(String javaSource) 

Method Source Code

//package com.java2s;
/*//from  www  . j  ava2  s .co m
 * Copyright (C) 2014 Project-Phoenix
 * 
 * This file is part of library.
 * 
 * library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3 of the License.
 * 
 * library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with library.  If not, see <http://www.gnu.org/licenses/>.
 */

public class Main {
    /**
     * Extract the class name of the Java source code
     * 
     * @param javaSource
     *            String containing Java source code of a class
     * @return
     * @throws IllegalArgumentException
     *             When the source code does not contains a class or is invalid
     */
    public static String extractClassName(String javaSource) {
        // Remove all tabs
        javaSource = javaSource.replaceAll("\t", "    ");

        int classIndex = javaSource.indexOf("class ");
        if (classIndex == -1)
            throw new IllegalArgumentException("Is not a class!");
        int bracketIndex = javaSource.indexOf('{', classIndex);
        if (bracketIndex == -1)
            throw new IllegalArgumentException("{ not after class");

        classIndex += "class ".length();
        String className = javaSource.substring(classIndex, bracketIndex).trim();
        if (className.isEmpty()) {
            throw new IllegalArgumentException("No class name found!");
        }
        return className;

    }
}

Related

1. extractClassName(final String classPath)
2. extractClassName(final String fullClassName)
3. extractClassName(String fullClassName)
4. extractClassName(String fullElement)
5. extractClassName(String fullyQualifiedClassName)
6. extractClassName(String methodName)
7. extractClassName(String qualifiedName)
8. extractClassNameFromArray(final String arrayName)
9. extractClassNames(Class[] classArray)