CreateTempFile.java #1

package com.perforce.jbrown.ctf;

import java.io.File;
import java.io.IOException;

/***
 * Creates a temp file in the same directory as the provided file.
 * pass the special string "null" to use the temp dir.
 * @author jbrown
 *
 */
public class CreateTempFile {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		if (args.length < 1) {
			System.out.println("Please provide the name of an existing file.");
			System.exit(1);
		}
		String existsFile = args[0];
		File file = null ;
		File tmpDir = null ;
		String tmpDirPath = null ;
		if ( ! "null".equalsIgnoreCase(existsFile)) {
			try {
			    file = new File(args[0]);
				if (!file.exists()) {
					System.out.println("File '" + existsFile
							+ "' does not exist.  Please provide the name of an existing file.");
					System.exit(2);
				}
				tmpDir = file.getParentFile();
				tmpDirPath = tmpDir.getPath();
			} catch (Exception e) {
				e.printStackTrace(System.out);
				System.exit(3);
			}
		}

		try {
			String tempFileName = createTempFileName(tmpDirPath);
			System.out.println("Temp file successfully created: " + tempFileName + " (will be deleted on exit)");
			
		} catch (IOException e) {

			e.printStackTrace(System.out);
			System.exit(4);
		}
	}

	public static String createTempFileName(String tmpDirName) throws IOException {

		File tmpDir = null;

		if (tmpDirName != null ) {
			tmpDir = new File(tmpDirName);
		}

		System.out.println("Creating file in " + tmpDir);
		File tmpFile = File.createTempFile(TMP_FILE_PFX, TMP_FILE_SFX, tmpDir);
		tmpFile.deleteOnExit();
		return tmpFile.getPath();

	}
	public static final String TMP_FILE_PFX = "p4j";
	public static final String TMP_FILE_SFX = ".tmp";
}