Posted By

akostajti on 12/01/09

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java

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Last Edited at 12/01/09 09:09am

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programmatically compiling a Java source file

/ Published in: Java

this simple snippet compiles a Java source file.

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package ex.tajti.tools;

import javax.tools.Diagnostic;
import javax.tools.DiagnosticListener;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

/**
 *
 * @author Ã¡kos tajti
 */
public class Compiler {

/**
     * compiles a java source file with the given <code>fileName</code>
     * 
     * @param fileName
     */
    public void compile(String fileName) {
        /*
         * the compiler will send its messages to this listener
         */
        DiagnosticListener listener = new DiagnosticListener() {

public void report(Diagnostic diagnostic) {
                System.err.println("gond: " + diagnostic.getMessage(null));
                System.err.println("sor: " + diagnostic.getLineNumber());
                System.err.println(diagnostic.getSource());
            }
        };
        
        //getting the compiler object
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        StandardJavaFileManager manager = compiler.getStandardFileManager(null, null, null);
        Iterable<? extends JavaFileObject> files = manager.getJavaFileObjects(fileName);
        JavaCompiler.CompilationTask task = compiler.getTask(null, manager, listener, null, null, files);
        
        // the compilation occures here
        task.call();
    }
}

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