processor.java

asm的源码包 并且包含英文的文档

        return bos.toByteArray();
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.util.Observer#update(java.util.Observable, java.lang.Object)
     */
    protected void update(final Object arg, final int n) {
        if (arg instanceof Throwable) {
            ((Throwable) arg).printStackTrace();
        } else {
            if (n % 100 == 0) {
                System.err.println(n + " " + arg);
            }
        }
    }

    public static void main(final String[] args) throws Exception {
        if (args.length < 2) {
            showUsage();
            return;
        }

        int inRepresentation = getRepresentation(args[0]);
        int outRepresentation = getRepresentation(args[1]);

        InputStream is = System.in;
        OutputStream os = new BufferedOutputStream(System.out);

        Source xslt = null;
        // boolean computeMax = true;

        for (int i = 2; i < args.length; i++) {
            if ("-in".equals(args[i])) {
                is = new FileInputStream(args[++i]);

            } else if ("-out".equals(args[i])) {
                os = new BufferedOutputStream(new FileOutputStream(args[++i]));

            } else if ("-xslt".equals(args[i])) {
                xslt = new StreamSource(new FileInputStream(args[++i]));

                // } else if( "-computemax".equals( args[ i].toLowerCase())) {
                // computeMax = true;

            } else {
                showUsage();
                return;

            }
        }

        if (inRepresentation == 0 || outRepresentation == 0) {
            showUsage();
            return;
        }

        Processor m = new Processor(inRepresentation,
                outRepresentation,
                is,
                os,
                xslt);

        long l1 = System.currentTimeMillis();
        int n = m.process();
        long l2 = System.currentTimeMillis();
        System.err.println(n);
        System.err.println("" + (l2 - l1) + "ms  " + 1000f * n / (l2 - l1)
                + " resources/sec");
    }

    private static int getRepresentation(final String s) {
        if ("code".equals(s)) {
            return BYTECODE;
        } else if ("xml".equals(s)) {
            return MULTI_XML;
        } else if ("singlexml".equals(s)) {
            return SINGLE_XML;
        }
        return 0;
    }

    private static void showUsage() {
        System.err.println("Usage: Main <in format> <out format> [-in <input jar>] [-out <output jar>] [-xslt <xslt fiel>]");
        System.err.println("  when -in or -out is omitted sysin and sysout would be used");
        System.err.println("  <in format> and <out format> - code | xml | singlexml");
    }

    /**
     * IputStream wrapper class used to protect input streams from being closed
     * by some stupid XML parsers.
     */
    private static final class ProtectedInputStream extends InputStream {
        private final InputStream is;

        private ProtectedInputStream(final InputStream is) {
            super();
            this.is = is;
        }

        public final void close() throws IOException {
        }

        public final int read() throws IOException {
            return is.read();
        }

        public final int read(final byte[] b, final int off, final int len)
                throws IOException
        {
            return is.read(b, off, len);
        }

        public final int available() throws IOException {
            return is.available();
        }
    }

    /**
     * A {@link ContentHandlerFactory ContentHandlerFactory} is used to create
     * {@link org.xml.sax.ContentHandler ContentHandler} instances for concrete
     * context.
     */
    private static interface ContentHandlerFactory {

        /**
         * Creates an instance of the content handler.
         * 
         * @return content handler
         */
        ContentHandler createContentHandler();

    }

    /**
     * SAXWriterFactory
     */
    private static final class SAXWriterFactory implements
            ContentHandlerFactory
    {
        private Writer w;

        private boolean optimizeEmptyElements;

        public SAXWriterFactory(
            final Writer w,
            final boolean optimizeEmptyElements)
        {
            this.w = w;
            this.optimizeEmptyElements = optimizeEmptyElements;
        }

        public final ContentHandler createContentHandler() {
            return new SAXWriter(w, optimizeEmptyElements);
        }

    }

    /**
     * ASMContentHandlerFactory
     */
    private static final class ASMContentHandlerFactory implements
            ContentHandlerFactory
    {
        private OutputStream os;

        private boolean computeMax;

        public ASMContentHandlerFactory(
            final OutputStream os,
            final boolean computeMax)
        {
            this.os = os;
            this.computeMax = computeMax;
        }

        public final ContentHandler createContentHandler() {
            return new ASMContentHandler(os, computeMax);
        }

    }

    /**
     * TransformerHandlerFactory
     */
    private static final class TransformerHandlerFactory implements
            ContentHandlerFactory
    {
        private SAXTransformerFactory saxtf;

        private Templates templates;

        private ContentHandler outputHandler;

        public TransformerHandlerFactory(
            final SAXTransformerFactory saxtf,
            final Templates templates,
            final ContentHandler outputHandler)
        {
            this.saxtf = saxtf;
            this.templates = templates;
            this.outputHandler = outputHandler;
        }

        public final ContentHandler createContentHandler() {
            try {
                TransformerHandler handler = saxtf.newTransformerHandler(templates);
                handler.setResult(new SAXResult(outputHandler));
                return handler;
            } catch (TransformerConfigurationException ex) {
                throw new RuntimeException(ex.toString());
            }
        }
    }

    /**
     * SubdocumentHandlerFactory
     */
    private final static class SubdocumentHandlerFactory implements
            ContentHandlerFactory
    {
        private ContentHandler subdocumentHandler;

        public SubdocumentHandlerFactory(final ContentHandler subdocumentHandler)
        {
            this.subdocumentHandler = subdocumentHandler;
        }

        public final ContentHandler createContentHandler() {
            return subdocumentHandler;
        }

    }

    /**
     * A {@link org.xml.sax.ContentHandler ContentHandler} and
     * {@link org.xml.sax.ext.LexicalHandler LexicalHandler} that serializes XML
     * from SAX 2.0 events into {@link java.io.Writer Writer}.
     * 
     * <i><blockquote> This implementation does not support namespaces, entity
     * definitions (uncluding DTD), CDATA and text elements. </blockquote></i>
     */
    private final static class SAXWriter extends DefaultHandler implements
            LexicalHandler
    {
        private static final char[] OFF = "                                                                                                        ".toCharArray();

        private Writer w;

        private boolean optimizeEmptyElements;

        private boolean openElement = false;

        private int ident = 0;

        /**
         * Creates <code>SAXWriter</code>.
         * 
         * @param w writer
         * @param optimizeEmptyElements if set to <code>true</code>, short
         *        XML syntax will be used for empty elements
         */
        public SAXWriter(final Writer w, final boolean optimizeEmptyElements) {
            this.w = w;
            this.optimizeEmptyElements = optimizeEmptyElements;
        }

        public final void startElement(
            final String ns,
            final String localName,
            final String qName,
            final Attributes atts) throws SAXException
        {
            try {
                closeElement();

                writeIdent();
                w.write("<".concat(qName));
                if (atts != null && atts.getLength() > 0) {
                    writeAttributes(atts);
                }

                if (!optimizeEmptyElements) {
                    w.write(">\n");
                } else {
                    openElement = true;
                }
                ident += 2;

            } catch (IOException ex) {
                throw new SAXException(ex);

            }
        }

        public final void endElement(
            final String ns,
            final String localName,
            final String qName) throws SAXException
        {
            ident -= 2;
            try {
                if (openElement) {
                    w.write("/>\n");
                    openElement = false;
                } else {
                    writeIdent();
                    w.write("</" + qName + ">\n");
                }

            } catch (IOException ex) {
                throw new SAXException(ex);

            }
        }

        public final void endDocument() throws SAXException {
            try {
                w.flush();

            } catch (IOException ex) {
                throw new SAXException(ex);

            }
        }

        public final void comment(final char[] ch, final int off, final int len)
                throws SAXException
        {
            try {
                closeElement();

                writeIdent();
                w.write("<!-- ");
                w.write(ch, off, len);
                w.write(" -->\n");

            } catch (IOException ex) {
                throw new SAXException(ex);

            }
        }

        public final void startDTD(
            final String arg0,
            final String arg1,
            final String arg2) throws SAXException
        {
        }

        public final void endDTD() throws SAXException {
        }

        public final void startEntity(final String arg0) throws SAXException {
        }

        public final void endEntity(final String arg0) throws SAXException {
        }