Example usage for org.apache.commons.compress.archivers.tar TarArchiveEntry isGlobalPaxHeader

Introduction

In this page you can find the example usage for org.apache.commons.compress.archivers.tar TarArchiveEntry isGlobalPaxHeader.

Prototype

public boolean isGlobalPaxHeader() 

Source Link

Document

Check if this is a Pax header.

Usage

From source file:com.puppetlabs.geppetto.forge.util.TarUtils.java

/**
 * Unpack the content read from <i>source</i> into <i>targetFolder</i>. If the
 * <i>skipTopFolder</i> is set, then don't assume that the archive contains one
 * single folder and unpack the content of that folder, not including the folder
 * itself./*from w  ww  .  j  ava2s .  c o m*/
 * 
 * @param source
 *            The input source. Must be in <i>TAR</i> format.
 * @param targetFolder
 *            The destination folder for the unpack. Not used when a <tt>fileCatcher</tt> is provided
 * @param skipTopFolder
 *            Set to <code>true</code> to unpack beneath the top folder
 *            of the archive. The archive must consist of one single folder and nothing else
 *            in order for this to work.
 * @param fileCatcher
 *            Used when specific files should be picked from the archive without writing them to disk. Can be
 *            <tt>null</tt>.
 * @throws IOException
 */
public static void unpack(InputStream source, File targetFolder, boolean skipTopFolder, FileCatcher fileCatcher)
        throws IOException {
    String topFolderName = null;
    Map<File, Map<Integer, List<String>>> chmodMap = new HashMap<File, Map<Integer, List<String>>>();
    TarArchiveInputStream in = new TarArchiveInputStream(source);
    try {
        TarArchiveEntry te = in.getNextTarEntry();
        if (te == null) {
            throw new IOException("No entry in the tar file");
        }
        do {
            if (te.isGlobalPaxHeader())
                continue;

            String name = te.getName();
            if (skipTopFolder) {
                int firstSlash = name.indexOf('/');
                if (firstSlash < 0)
                    throw new IOException("Archive doesn't contain one single folder");

                String tfName = name.substring(0, firstSlash);
                if (topFolderName == null)
                    topFolderName = tfName;
                else if (!tfName.equals(topFolderName))
                    throw new IOException("Archive doesn't contain one single folder");
                name = name.substring(firstSlash + 1);
            }
            if (name.length() == 0)
                continue;

            String linkName = te.getLinkName();
            if (linkName != null) {
                if (linkName.trim().equals(""))
                    linkName = null;
            }

            if (fileCatcher != null) {
                if (linkName == null && !te.isDirectory() && fileCatcher.accept(name)) {
                    if (fileCatcher.catchData(name, in))
                        // We're done here
                        return;
                }
                continue;
            }

            File outFile = new File(targetFolder, name);
            if (linkName != null) {
                if (!OsUtil.link(targetFolder, name, te.getLinkName()))
                    throw new IOException("Archive contains links but they are not supported on this platform");
            } else {
                if (te.isDirectory()) {
                    outFile.mkdirs();
                } else {
                    outFile.getParentFile().mkdirs();
                    OutputStream target = new FileOutputStream(outFile);
                    StreamUtil.copy(in, target);
                    target.close();
                    outFile.setLastModified(te.getModTime().getTime());
                }
                registerChmodFile(chmodMap, targetFolder, Integer.valueOf(te.getMode()), name);
            }
        } while ((te = in.getNextTarEntry()) != null);
    } finally {
        StreamUtil.close(in);
    }
    chmod(chmodMap);
}

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