| package org.apache.myfaces.extensions.scripting.sandbox.compiler; |
| |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * <p>This factory chooses and creates an instance of the according compiler |
| * implementation based on the current JVM for you. If you're using a Java 6 |
| * VM, it will return a compiler using the JSR-199 API, otherwise it will |
| * return a compiler that uses the JavaC tool.</p> |
| */ |
| public class CompilerFactory { |
| |
| /** |
| * The logger instance for this class. |
| */ |
| private static final Logger logger = Logger.getLogger(CompilerFactory.class.getName()); |
| |
| // ------------------------------------------ Public methods |
| |
| /** |
| * <p>Factory method that creates a new Java compiler depending on the |
| * Java runtime that this application is running on. That means, if the |
| * Java runtime supports the JSR-199 API (i.e. it's at least a Java 6 |
| * runtime) this API will be used. Otherwise a compiler will be returned |
| * that tries to use some internal JDK classes.</p> |
| * |
| * @return a new Java compiler depending on the Java runtime |
| */ |
| public static Compiler createCompiler() { |
| if (logger.isLoggable(Level.WARNING) && |
| !System.getProperty("java.vendor").contains("Sun Microsystems")) { |
| logger.warning("This application is running on a Java runtime that neither supports the JSR-199 API " + |
| "nor is it distributed by Sun Microsystems. However, the compiler implementation that will " + |
| "be used depends on internal classes in the package 'com.sun.tools.javac' so compilation " + |
| "is likely to fail! Be sure that the Java runtime that you're using provides these internal " + |
| "classes!"); |
| } |
| |
| return new JavacCompiler(); |
| } |
| } |