Java

Find ZIP Entries Matching a Wildcard Pattern Using EntryMatching

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This example demonstrates how to use the EntryMatching method to find ZIP entries whose stored paths match a wildcard pattern.

The wildcard character * matches zero or more characters. The comparison is performed against the full stored path within the ZIP archive.

This method is useful for:

• Finding files having a particular extension
• Locating files within specific subdirectories
• Searching ZIP archives without manually iterating through every entry

Suppose the ZIP archive contains:

docs/
docs/readme.txt
docs/manual.pdf
images/logo.png
images/banner.jpg
data/config/settings.json

Notice that the ZIP archive contains an explicit directory entry named docs/. ZIP archives may optionally contain separate directory entries in addition to file entries.

When searching with the pattern docs/*, the first matching entry could therefore be the directory entry docs/ rather than a file contained within that directory.

The example searches for:

• The first .png file
• The first entry beneath the docs directory
• The first JSON file anywhere within the ZIP archive

Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  Open an existing ZIP archive.
    CkZip zip = new CkZip();

    success = zip.OpenZip("example.zip");
    if (success == false) {
        System.out.println(zip.lastErrorText());
        return;
        }

    CkZipEntry entry = new CkZipEntry();

    //  ------------------------------------------------------------
    //  Find the first .png file in the ZIP archive.

    success = zip.EntryMatching("*.png",entry);

    if (success == true) {
        System.out.println("Found PNG file:");
        System.out.println("  " + entry.fileName());
        System.out.println("");
        }

    //  ------------------------------------------------------------
    //  Find the first entry beneath the docs directory.
    //  
    //  Note: ZIP archives may optionally contain explicit directory
    //  entries such as "docs/" in addition to file entries.
    //  Therefore, the first matching entry could be the directory
    //  itself rather than a file contained within the directory.

    success = zip.EntryMatching("docs/*",entry);

    if (success == true) {
        System.out.println("First matching docs entry:");
        System.out.println("  " + entry.fileName());
        System.out.println("  IsDirectory = " + entry.get_IsDirectory());
        System.out.println("");
        }

    //  ------------------------------------------------------------
    //  Find the first JSON file anywhere in the ZIP archive.

    success = zip.EntryMatching("*.json",entry);

    if (success == true) {
        System.out.println("Found JSON file:");
        System.out.println("  " + entry.fileName());
        System.out.println("");
        }

    //  ------------------------------------------------------------
    //  The matching is performed against the full stored ZIP path.
    //  For example:
    //  
    //      docs/readme.txt
    //      images/logo.png
    //      data/config/settings.json
    //  
    //  The wildcard '*' matches zero or more characters.

    zip.CloseZip();

    System.out.println("Done.");
  }
}