redirector.java

Use the links below to download a source distribution of Ant from one of our mirrors. It is good pra

     */
    public synchronized void setOutputFilterChains(Vector outputFilterChains) {
        this.outputFilterChains = outputFilterChains;
    }

    /**
     * Set the error <code>FilterChain</code>s.
     *
     * @param errorFilterChains <code>Vector</code> containing <code>FilterChain</code>.
     */
    public synchronized void setErrorFilterChains(Vector errorFilterChains) {
        this.errorFilterChains = errorFilterChains;
    }

    /**
     * Set a property from a ByteArrayOutputStream
     *
     * @param baos contains the property value.
     * @param propertyName the property name.
     *
     * @exception IOException if the value cannot be read form the stream.
     */
    private void setPropertyFromBAOS(ByteArrayOutputStream baos,
                                     String propertyName) throws IOException {

        BufferedReader in
            = new BufferedReader(new StringReader(Execute.toString(baos)));
        String line = null;
        StringBuffer val = new StringBuffer();
        while ((line = in.readLine()) != null) {
            if (val.length() != 0) {
                val.append(StringUtils.LINE_SEP);
            }
            val.append(line);
        }
        managingTask.getProject().setNewProperty(propertyName, val.toString());
    }

    /**
     * Create the input, error and output streams based on the
     * configuration options.
     */
    public synchronized void createStreams() {
        outStreams();
        errorStreams();
        if (alwaysLog || outputStream == null) {
            OutputStream outputLog
                = new LogOutputStream(managingTask, Project.MSG_INFO);
            outputStream = (outputStream == null)
                ? outputLog : new TeeOutputStream(outputLog, outputStream);
        }
        if (alwaysLog || errorStream == null) {
            OutputStream errorLog
                = new LogOutputStream(managingTask, Project.MSG_WARN);
            errorStream = (errorStream == null)
                ? errorLog : new TeeOutputStream(errorLog, errorStream);
        }
        if ((outputFilterChains != null && outputFilterChains.size() > 0)
            || !(outputEncoding.equalsIgnoreCase(inputEncoding))) {
            try {
                LeadPipeInputStream snk = new LeadPipeInputStream();
                snk.setManagingComponent(managingTask);

                InputStream outPumpIn = snk;

                Reader reader = new InputStreamReader(outPumpIn, inputEncoding);

                if (outputFilterChains != null && outputFilterChains.size() > 0) {
                    ChainReaderHelper helper = new ChainReaderHelper();
                    helper.setProject(managingTask.getProject());
                    helper.setPrimaryReader(reader);
                    helper.setFilterChains(outputFilterChains);
                    reader = helper.getAssembledReader();
                }
                outPumpIn = new ReaderInputStream(reader, outputEncoding);

                Thread t = new Thread(threadGroup, new StreamPumper(
                    outPumpIn, outputStream, true), "output pumper");
                t.setPriority(Thread.MAX_PRIORITY);
                outputStream = new PipedOutputStream(snk);
                t.start();
            } catch (IOException eyeOhEx) {
                throw new BuildException(
                    "error setting up output stream", eyeOhEx);
            }
        }

        if ((errorFilterChains != null && errorFilterChains.size() > 0)
            || !(errorEncoding.equalsIgnoreCase(inputEncoding))) {
            try {
                LeadPipeInputStream snk = new LeadPipeInputStream();
                snk.setManagingComponent(managingTask);

                InputStream errPumpIn = snk;

                Reader reader = new InputStreamReader(errPumpIn, inputEncoding);

                if (errorFilterChains != null && errorFilterChains.size() > 0) {
                    ChainReaderHelper helper = new ChainReaderHelper();
                    helper.setProject(managingTask.getProject());
                    helper.setPrimaryReader(reader);
                    helper.setFilterChains(errorFilterChains);
                    reader = helper.getAssembledReader();
                }
                errPumpIn = new ReaderInputStream(reader, errorEncoding);

                Thread t = new Thread(threadGroup, new StreamPumper(
                    errPumpIn, errorStream, true), "error pumper");
                t.setPriority(Thread.MAX_PRIORITY);
                errorStream = new PipedOutputStream(snk);
                t.start();
            } catch (IOException eyeOhEx) {
                throw new BuildException(
                    "error setting up error stream", eyeOhEx);
            }
        }

        // if input files are specified, inputString and inputStream are ignored;
        // classes that work with redirector attributes can enforce
        // whatever warnings are needed
        if (input != null && input.length > 0) {
            managingTask.log("Redirecting input from file"
                + ((input.length == 1) ? "" : "s"), Project.MSG_VERBOSE);
            try {
                inputStream = new ConcatFileInputStream(input);
            } catch (IOException eyeOhEx) {
                throw new BuildException(eyeOhEx);
            }
            ((ConcatFileInputStream) inputStream).setManagingComponent(managingTask);
        } else if (inputString != null) {
            StringBuffer buf = new StringBuffer("Using input ");
            if (logInputString) {
                buf.append('"').append(inputString).append('"');
            } else {
                buf.append("string");
            }
            managingTask.log(buf.toString(), Project.MSG_VERBOSE);
            inputStream = new ByteArrayInputStream(inputString.getBytes());
        }

        if (inputStream != null
            && inputFilterChains != null && inputFilterChains.size() > 0) {
            ChainReaderHelper helper = new ChainReaderHelper();
            helper.setProject(managingTask.getProject());
            try {
                helper.setPrimaryReader(
                    new InputStreamReader(inputStream, inputEncoding));
            } catch (IOException eyeOhEx) {
                throw new BuildException(
                    "error setting up input stream", eyeOhEx);
            }
            helper.setFilterChains(inputFilterChains);
            inputStream = new ReaderInputStream(
                helper.getAssembledReader(), inputEncoding);
        }
    }

    /** outStreams */
    private void outStreams() {
        if (out != null && out.length > 0) {
            String logHead = new StringBuffer("Output ").append(
                ((append) ? "appended" : "redirected")).append(
                " to ").toString();
            outputStream = foldFiles(out, logHead, Project.MSG_VERBOSE);
        }
        if (outputProperty != null) {
            if (baos == null) {
                baos = new PropertyOutputStream(outputProperty);
                managingTask.log("Output redirected to property: "
                    + outputProperty, Project.MSG_VERBOSE);
            }
            //shield it from being closed by a filtering StreamPumper
            OutputStream keepAliveOutput = new KeepAliveOutputStream(baos);
            outputStream = (outputStream == null) ? keepAliveOutput
                : new TeeOutputStream(outputStream, keepAliveOutput);
        } else {
            baos = null;
        }
    }

    private void errorStreams() {
        if (error != null && error.length > 0) {
            String logHead = new StringBuffer("Error ").append(
                ((append) ? "appended" : "redirected")).append(
                " to ").toString();
            errorStream = foldFiles(error, logHead, Project.MSG_VERBOSE);
        } else if (!(logError || outputStream == null)) {
            long funnelTimeout = 0L;
            OutputStreamFunneler funneler
                = new OutputStreamFunneler(outputStream, funnelTimeout);
            try {
                outputStream = funneler.getFunnelInstance();
                errorStream = funneler.getFunnelInstance();
            } catch (IOException eyeOhEx) {
                throw new BuildException(
                    "error splitting output/error streams", eyeOhEx);
            }
        }
        if (errorProperty != null) {
            if (errorBaos == null) {
                errorBaos = new PropertyOutputStream(errorProperty);
                managingTask.log("Error redirected to property: " + errorProperty,
                    Project.MSG_VERBOSE);
            }
            //shield it from being closed by a filtering StreamPumper
            OutputStream keepAliveError = new KeepAliveOutputStream(errorBaos);
            errorStream = (error == null || error.length == 0) ? keepAliveError
                : new TeeOutputStream(errorStream, keepAliveError);
        } else {
            errorBaos = null;
        }
    }

    /**
     * Create the StreamHandler to use with our Execute instance.
     *
     * @return the execute stream handler to manage the input, output and
     * error streams.
     *
     * @throws BuildException if the execute stream handler cannot be created.
     */
    public synchronized ExecuteStreamHandler createHandler()
        throws BuildException {
        createStreams();
        return new PumpStreamHandler(outputStream, errorStream, inputStream);
    }

    /**
     * Pass output sent to System.out to specified output.
     *
     * @param output the data to be output
     */
    protected synchronized void handleOutput(String output) {
        if (outPrintStream == null) {
            outPrintStream = new PrintStream(outputStream);
        }
        outPrintStream.print(output);
    }

    /**
     * Handle an input request
     *
     * @param buffer the buffer into which data is to be read.
     * @param offset the offset into the buffer at which data is stored.
     * @param length the amount of data to read
     *
     * @return the number of bytes read
     *
     * @exception IOException if the data cannot be read
     */
    protected synchronized int handleInput(byte[] buffer, int offset,
                                           int length) throws IOException {
        if (inputStream == null) {
            return managingTask.getProject().defaultInput(buffer, offset,
                                                          length);
        } else {
            return inputStream.read(buffer, offset, length);
        }
    }

    /**
     * Process data due to a flush operation.
     *
     * @param output the data being flushed.
     */
    protected synchronized void handleFlush(String output) {
        if (outPrintStream == null) {
            outPrintStream = new PrintStream(outputStream);
        }
        outPrintStream.print(output);
        outPrintStream.flush();
    }

    /**
     * Process error output
     *
     * @param output the error output data.
     */
    protected synchronized void handleErrorOutput(String output) {
        if (errorPrintStream == null) {
            errorPrintStream = new PrintStream(errorStream);
        }
        errorPrintStream.print(output);
    }

    /**
     * Handle a flush operation on the error stream
     *
     * @param output the error information being flushed.
     */
    protected synchronized void handleErrorFlush(String output) {
        if (errorPrintStream == null) {
            errorPrintStream = new PrintStream(errorStream);
        }
        errorPrintStream.print(output);
    }

    /**
     * Get the output stream for the redirector
     *
     * @return the redirector's output stream or null if no output
     *         has been configured
     */
    public synchronized OutputStream getOutputStream() {
        return outputStream;
    }

    /**
     * Get the error stream for the redirector
     *
     * @return the redirector's error stream or null if no output
     *         has been configured
     */
    public synchronized OutputStream getErrorStream() {
        return errorStream;
    }

    /**
     * Get the input stream for the redirector
     *
     * @return the redirector's input stream or null if no output
     *         has been configured
     */
    public synchronized InputStream getInputStream() {
        return inputStream;
    }

    /**
     * Complete redirection.
     *
     * This operation will close any streams and create any specified
     * property values.
     *
     * @throws IOException if the output properties cannot be read from their
     * output streams.
     */
    public synchronized void complete() throws IOException {
        System.out.flush();
        System.err.flush();

        if (inputStream != null) {
            inputStream.close();
        }

        outputStream.flush();
        outputStream.close();

        errorStream.flush();
        errorStream.close();

        //wait for the StreamPumpers to finish
        while (threadGroup.activeCount() > 0) {
            try {
                managingTask.log("waiting for " + threadGroup.activeCount()
                    + " Threads:", Project.MSG_DEBUG);
                Thread[] thread = new Thread[threadGroup.activeCount()];
                threadGroup.enumerate(thread);
                for (int i = 0; i < thread.length && thread[i] != null; i++) {
                    try {
                        managingTask.log(thread[i].toString(), Project.MSG_DEBUG);
                    } catch (NullPointerException enPeaEx) {
                        // Ignore exception
                    }
                }
                wait(ONE_SECOND);
            } catch (InterruptedException eyeEx) {
                // Ignore exception
            }
        }

        setProperties();

        inputStream = null;
        outputStream = null;
        errorStream = null;
        outPrintStream = null;
        errorPrintStream = null;
   }

    /**
     * Notify the <code>Redirector</code> that it is now okay
     * to set any output and/or error properties.
     */
    public synchronized void setProperties() {
        if (baos != null) {
            try {
                baos.close();
            } catch (IOException eyeOhEx) {
                // Ignore exception
            }
        }
        if (errorBaos != null) {
            try {
                errorBaos.close();
            } catch (IOException eyeOhEx) {
                // Ignore exception
            }
        }
    }

    private OutputStream foldFiles(File[] file, String logHead, int loglevel) {
        OutputStream result
            = new LazyFileOutputStream(file[0], append, createEmptyFiles);

        managingTask.log(logHead + file[0], loglevel);
        char[] c = new char[logHead.length()];
        Arrays.fill(c, ' ');
        String indent = new String(c);

        for (int i = 1; i < file.length; i++) {
            outputStream = new TeeOutputStream(outputStream,
                new LazyFileOutputStream(file[i], append, createEmptyFiles));
            managingTask.log(indent + file[i], loglevel);
        }
        return result;
    }
}