nom.tam.fits.compress.CloseIS Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of nom-tam-fits Show documentation
Java library for reading and writing FITS files. FITS, the Flexible Image Transport System, is the format commonly used in the archiving and transport of astronomical data.
There is a newer version: 1.20.2
Show newest version
package nom.tam.fits.compress;

/*
 * #%L
 * nom.tam FITS library
 * %%
 * Copyright (C) 1996 - 2015 nom-tam-fits
 * %%
 * This is free and unencumbered software released into the public domain.
 * 
 * Anyone is free to copy, modify, publish, use, compile, sell, or
 * distribute this software, either in source code form or as a compiled
 * binary, for any purpose, commercial or non-commercial, and by any
 * means.
 * 
 * In jurisdictions that recognize copyright laws, the author or authors
 * of this software dedicate any and all copyright interest in the
 * software to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and
 * successors. We intend this dedication to be an overt act of
 * relinquishment in perpetuity of all present and future rights to this
 * software under copyright law.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 * #L%
 */

import static nom.tam.util.LoggerHelper.getLogger;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.logging.Level;
import java.util.logging.Logger;

public class CloseIS extends FilterInputStream {

    private static final Logger LOG = getLogger(CloseIS.class);

    private static final int COPY_BUFFER_SIZE = 64 * 1024;

    private InputStream output;

    private OutputStream input;

    private String errorText;

    private IOException exception;

    private final Thread stdError;

    private final Thread copier;

    private final Process proc;

    public CloseIS(Process proc, final InputStream compressed) {
        super(new BufferedInputStream(proc.getInputStream(), CompressionManager.ONE_MEGABYTE));
        if (compressed == null) {
            throw new NullPointerException();
        }
        this.proc = proc;
        final InputStream error = proc.getErrorStream();
        this.output = proc.getInputStream();
        this.input = proc.getOutputStream();
        stdError = new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
                    byte[] buffer = new byte[COPY_BUFFER_SIZE];
                    int len;
                    while ((len = error.read(buffer, 0, buffer.length)) >= 0) {
                        bytes.write(buffer, 0, len);
                    }
                    error.close();
                    errorText = new String(bytes.toByteArray(), Charset.defaultCharset());
                } catch (IOException e) {
                    exception = e;
                }
            }
        });
        // Now copy everything in a separate thread.
        copier = new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    byte[] buffer = new byte[COPY_BUFFER_SIZE];
                    int len;
                    while ((len = compressed.read(buffer, 0, buffer.length)) >= 0) {
                        input.write(buffer, 0, len);
                    }
                    input.close();
                } catch (IOException e) {
                    exception = e;
                }
                try {
                    compressed.close();
                } catch (IOException e) {
                    if (exception == null) {
                        exception = e;
                    }
                }
            }
        });
        start();
    }

    /**
     * start all threads.
     */
    private void start() {
        stdError.start();
        copier.start();
    }

    @Override
    public int read() throws IOException {
        int result = 0;
        try {
            result = super.read();
            return result;
        } catch (IOException e) {
            result = -1;
            throw e;
        } finally {
            handledOccuredException(result);
        }
    }

    private void handledOccuredException(int result) throws IOException {
        int exitValue = 0;
        if (result < 0) {
            try {
                stdError.join();
                copier.join();
                exitValue = proc.exitValue();
            } catch (Exception e) {
                LOG.log(Level.WARNING, "could not join the stream processes", e);
            }
        }
        if (exception != null || exitValue != 0) {
            if (errorText != null && !errorText.trim().isEmpty()) {
                throw new IOException(errorText, exception);
            } else {
                if (exception == null) {
                    throw new IOException("exit value was " + exitValue);
                } else {
                    throw exception;
                }
            }
        }
    }

    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        int result = 0;
        try {
            result = super.read(b, off, len);
            return result;
        } catch (IOException e) {
            throw e;
        } finally {
            handledOccuredException(result);
        }
    }

    @Override
    public void close() throws IOException {
        super.close();
        this.input.close();
        this.output.close();
    }

}