Main.java Source code

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Here is the source code for Main.java

Source

/*
 * Copyright Aduna (http://www.aduna-software.com/) (c) 1997-2006.
 *
 * Licensed under the Aduna BSD-style license.
 */
import java.io.File;
import java.io.IOException;

public class Main {

    /**
     * Creates a new and empty directory in the default temp directory using the
     * given prefix. This methods uses {@link File#createTempFile} to create a
     * new tmp file, deletes it and creates a directory for it instead.
     * 
     * @param prefix The prefix string to be used in generating the diretory's
     * name; must be at least three characters long.
     * @return A newly-created empty directory.
     * @throws IOException If no directory could be created.
     */
    public static File createTempDir(String prefix) throws IOException {
        String tmpDirStr = System.getProperty("java.io.tmpdir");
        if (tmpDirStr == null) {
            throw new IOException("System property 'java.io.tmpdir' does not specify a tmp dir");
        }

        File tmpDir = new File(tmpDirStr);
        if (!tmpDir.exists()) {
            boolean created = tmpDir.mkdirs();
            if (!created) {
                throw new IOException("Unable to create tmp dir " + tmpDir);
            }
        }

        File resultDir = null;
        int suffix = (int) System.currentTimeMillis();
        int failureCount = 0;
        do {
            resultDir = new File(tmpDir, prefix + suffix % 10000);
            suffix++;
            failureCount++;
        } while (resultDir.exists() && failureCount < 50);

        if (resultDir.exists()) {
            throw new IOException(
                    failureCount + " attempts to generate a non-existent directory name failed, giving up");
        }
        boolean created = resultDir.mkdir();
        if (!created) {
            throw new IOException("Failed to create tmp directory");
        }

        return resultDir;
    }

}