PrologCodeWriter.java

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package org.mule.devkit.model.code.writer;

import org.mule.devkit.model.code.CodeWriter;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

/**
 * Writes all the source files under the specified file folder and
 * inserts a file prolog comment in each java source file.
 *
 * @author Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public class PrologCodeWriter extends FilterCodeWriter {

    /**
     * prolog comment
     */
    private final String prolog;

    /**
     * @param core   This CodeWriter will be used to actually create a storage for files.
     *               PrologCodeWriter simply decorates this underlying CodeWriter by
     *               adding prolog comments.
     * @param prolog Strings that will be added as comments.
     *               This string may contain newlines to produce multi-line comments.
     *               '//' will be inserted at the beginning of each line to make it
     *               a valid Java comment, so the caller can just pass strings like
     *               "abc\ndef"
     */
    public PrologCodeWriter(CodeWriter core, String prolog) {
        super(core);
        this.prolog = prolog;
    }


    public Writer openSource(org.mule.devkit.model.code.Package pkg, String fileName) throws IOException {
        Writer w = super.openSource(pkg, fileName);

        PrintWriter out = new PrintWriter(w);

        // write prolog if this is a java source file
        if (prolog != null) {
            out.println("//");

            String s = prolog;
            int idx;
            while ((idx = s.indexOf('\n')) != -1) {
                out.println("// " + s.substring(0, idx));
                s = s.substring(idx + 1);
            }
            out.println("//");
            out.println();
        }
        out.flush();    // we can't close the stream for that would close the undelying stream.

        return w;
    }
}