Examples of groovy.lang.Writable

groovy.lang.Writable

Represents an object which is capable of writing itself to a text stream in a more efficient format than just creating a toString() representation of itself. This mechanism is particularly useful for templates and such like.

It is worth noting that writable implementations often override their toString() implementation as well to allow rendering the same result directly to a String; however this is not required.
@author James Strachan @version $Revision: 18909 $

   @Deprecated
   public void merge(Template template, BindingContext context) throws Exception
   {
      context.put("_ctx", context);
      context.setGroovyTemplateService(this);
      Writable writable = template.make(context);
      writable.writeTo(context.getWriter());
   }

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            throw new ScriptException("Unable to compile GSP script: " + e.getMessage());
        }


        Bindings bindings = ctx.getBindings(ScriptContext.ENGINE_SCOPE);


        Writable result = template.make(bindings);


        try {
            result.writeTo(ctx.getWriter());
        } catch (IOException e) {
            throw new ScriptException("Unable to write result of script execution: " + e.getMessage());
        }


        return null;

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     * @param chunked whether or not the Base64 encoded data should be MIME chunked
     * @return object which will write the Base64 encoding of the byte array
     * @since 1.5.7
     */
    public static Writable encodeBase64(final byte[] data, final boolean chunked) {
        return new Writable() {
            public Writer writeTo(final Writer writer) throws IOException {
                int charCount = 0;
                final int dLimit = (data.length / 3) * 3;


                for (int dIndex = 0; dIndex != dLimit; dIndex += 3) {

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    private static String asString(GPathResult node) {
        // little bit of hackery to avoid Groovy dependency in this file
        try {
            Object builder = ((Class) Class.forName("groovy.xml.StreamingMarkupBuilder")).newInstance();
            Writable w = (Writable) InvokerHelper.invokeMethod(builder, "bindNode", node);
            return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + w.toString();
        } catch (Exception e) {
            return "Couldn't convert node to string because: " + e.getMessage();
        }
    }

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    private static String asString(GPathResult node) {
        // little bit of hackery to avoid Groovy dependency in this file
        try {
            Object builder = ((Class) Class.forName("groovy.xml.StreamingMarkupBuilder")).newInstance();
            Writable w = (Writable) InvokerHelper.invokeMethod(builder, "bindNode", node);
            return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + w.toString();
        } catch (Exception e) {
            return "Couldn't convert node to string because: " + e.getMessage();
        }
    }

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     * @param chunked whether or not the Base64 encoded data should be MIME chunked
     * @return object which will write the Base64 encoding of the byte array
     * @since 1.5.7
     */
    public static Writable encodeBase64(final byte[] data, final boolean chunked) {
        return new Writable() {
            public Writer writeTo(final Writer writer) throws IOException {
                int charCount = 0;
                final int dLimit = (data.length / 3) * 3;


                for (int dIndex = 0; dIndex != dLimit; dIndex += 3) {

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    public void marshalObject(Object object, XML xml) throws ConverterException {
        xml.attribute("encoding", "BASE-64");
        xml.chars("");


        Writable w;
        if (object instanceof byte[]) {
            w = EncodingGroovyMethods.encodeBase64((byte[])object);
        }
        else {
            w = EncodingGroovyMethods.encodeBase64((Byte[])object);
        }


        try {
            w.writeTo(xml.getStream());
        }
        catch (IOException e) {
            throw new ConverterException(e);
        }
    }

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    public static void writeSlurperResult(GPathResult result, Writer output) throws IOException {
        Binding b = new Binding();
        b.setVariable("node", result);
        // this code takes the XML parsed by XmlSlurper and writes it out using StreamingMarkupBuilder
        // don't ask me how it works, refer to John Wilson ;-)
        Writable w = (Writable)new GroovyShell(b).evaluate(
                "new groovy.xml.StreamingMarkupBuilder().bind {" +
                " mkp.declareNamespace(\"\":  \"http://java.sun.com/xml/ns/j2ee\");" +
                " mkp.yield node}");
        w.writeTo(output);
    }

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    private static String asString(GPathResult node) {
        // little bit of hackery to avoid Groovy dependency in this file
        try {
            Object builder = ((Class) Class.forName("groovy.xml.StreamingMarkupBuilder")).newInstance();
            InvokerHelper.setProperty(builder, "encoding", "UTF-8");
            Writable w = (Writable) InvokerHelper.invokeMethod(builder, "bindNode", node);
            return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + w.toString();
        } catch (Exception e) {
            return "Couldn't convert node to string because: " + e.getMessage();
        }
    }

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     *         from the reader when the Writable#writeTo(Writer) is called.
     * @since 1.0
     */
    public static Writable filterLine(Reader reader, final @ClosureParams(value=SimpleType.class, options="java.lang.String") Closure closure) {
        final BufferedReader br = new BufferedReader(reader);
        return new Writable() {
            public Writer writeTo(Writer out) throws IOException {
                BufferedWriter bw = new BufferedWriter(out);
                String line;
                BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
                while ((line = br.readLine()) != null) {

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