Package org.apache.maven.shared.jar

Class JarAnalyzer

java.lang.Object
org.apache.maven.shared.jar.JarAnalyzer
public class JarAnalyzer extends Object
Open a JAR file to be analyzed. Note that once created, the closeQuietly() method should be called to release the associated file handle. Typical usage: 
  JarAnalyzer jar = new JarAnalyzer( jarFile );

  try
  {
      // do some analysis, such as:
      jarClasses = jarClassAnalyzer.analyze( jar );
  }
  finally
  {
      jar.closeQuietly();
  }

  // use jar.getJarData() in some way, or the data returned by the JAR analyzer. jar itself can no longer be used.
Note: that the actual data is separated from this class by design to minimise the chance of forgetting to close the JAR file. The JarData class exposed, as well as any data returned by actual analyzers that use this class, can be used safely once this class is out of scope.
See Also:

  • Constructor Details

    • JarAnalyzer

      public JarAnalyzer(File file) throws IOException
      Constructor. Opens the JAR file, so should be matched by a call to closeQuietly().
      Parameters:
      file - the JAR file to open
      Throws:
      IOException - if there is a problem opening the JAR file, or reading the manifest. The JAR file will be closed if this occurs.

  • Method Details

    • getEntryInputStream

      public InputStream getEntryInputStream(JarEntry entry) throws IOException
      Get the data for an individual entry in the JAR. The caller should closeQuietly the input stream, and should not retain the stream as the JAR file may be closed elsewhere.
      Parameters:
      entry - the JAR entry to read from
      Returns:
      the input stream of the individual JAR entry.
      Throws:
      IOException - if there is a problem opening the individual entry

    • closeQuietly

      public void closeQuietly()
      Close the associated JAR file, ignoring any errors that may occur.

    • filterEntries

      public List<JarEntry> filterEntries(Pattern pattern)
      Filter a list of JAR entries against the pattern.
      Parameters:
      pattern - the pattern to filter against
      Returns:
      the list of files found, in JarEntry elements

    • getClassEntries

      public List<JarEntry> getClassEntries()
      Get all the classes in the JAR.
      Returns:
      the list of files found, in JarEntry elements

    • getMavenPomEntries

      public List<JarEntry> getMavenPomEntries()
      Get all the Maven POM entries in the JAR.
      Returns:
      the list of files found, in JarEntry elements

    • getVersionEntries

      public List<JarEntry> getVersionEntries()
      Get all the version text files in the JAR.
      Returns:
      the list of files found, in JarEntry elements

    • getEntries

      public List<JarEntry> getEntries()
      Get all the contained files in the JAR.
      Returns:
      the list of files found, in JarEntry elements

    • getFile

      public File getFile()
      Get the file that was opened by this analyzer.
      Returns:
      the JAR file reference

    • getJarData

      public JarData getJarData()