[Schmitzm-commits] r1536 - trunk/schmitzm-core/src/main/java/de/schmitzm/swing

[scm-commit@wald.intevation.org]

Author: mojays
Date: 2011-03-23 17:41:04 +0100 (Wed, 23 Mar 2011)
New Revision: 1536

Added:
   trunk/schmitzm-core/src/main/java/de/schmitzm/swing/FileExtensionFilter.java
Log:
new FileExtensionFilter

Added: trunk/schmitzm-core/src/main/java/de/schmitzm/swing/FileExtensionFilter.java
===================================================================
--- trunk/schmitzm-core/src/main/java/de/schmitzm/swing/FileExtensionFilter.java	2011-03-22 10:24:49 UTC (rev 1535)
+++ trunk/schmitzm-core/src/main/java/de/schmitzm/swing/FileExtensionFilter.java	2011-03-23 16:41:04 UTC (rev 1536)
@@ -0,0 +1,82 @@
+package de.schmitzm.swing;
+
+import java.io.File;
+
+import javax.swing.filechooser.FileFilter;
+
+import de.schmitzm.io.IOUtil;
+import de.schmitzm.lang.LangUtil;
+
+/**
+ * A file filter based on file extensions.
+ */
+public class FileExtensionFilter extends FileFilter {
+  /** Holds the file extensions to accept. */
+  protected String[] acceptFileExt = null;
+  /** Indicates whether the file extensions to accept are defined with the
+   *  leading dot. */
+  protected boolean  acceptFileExtInclDot = false;
+  /** Holds a description for the file extensions to accept. */
+  protected String   acceptFileExtDesc = "";
+  
+  /**
+   * Creates a new filter based on file extensions.
+   * @param desc description for the filter (if {@code null} only a list of extensions will
+   *             be used as descriptions)
+   * @param inclDot indicated whether the file extensions are defined with
+   *                the leading dot
+   * @param fileExt the file extensions to accept
+   */
+  public FileExtensionFilter(String desc, boolean inclDot, String... fileExt) {
+    this.acceptFileExt = fileExt;
+    this.acceptFileExtInclDot = inclDot;
+    this.acceptFileExtDesc = LangUtil.stringConcatWithSep(", ",(Object[])acceptFileExt);
+    if ( desc != null )
+      this.acceptFileExtDesc = desc + " ("+this.acceptFileExtDesc+")";
+  }
+  
+  /**
+   * Tests whether a file satisfies the filter.
+   * @return {@code true} if the file is a directory (so that directories
+   * are also shown in the file chooser.
+   */
+  @Override
+  public boolean accept(File f) {
+    if ( f.isDirectory() )
+      return true;
+    
+    String fileExt = IOUtil.getFileExt(f, acceptFileExtInclDot);
+    for (String acceptExt : acceptFileExt)
+      if ( acceptExt.equalsIgnoreCase(fileExt) )
+        return true;
+    return false;
+  }
+
+  /**
+   * Returns a description for the accepted files.
+   */
+  @Override
+  public String getDescription() {
+    return acceptFileExtDesc;
+  }
+  
+  /**
+   * Returns a {@link javax.swing.filechooser.FileFilter} for this filter.
+   * @return {@code this}
+   */
+  public FileFilter convertForJFileChooser() {
+    return this;
+  }
+
+  /**
+   * Returns a {@link java.io.FileFilter} for this filter.
+   */
+  public java.io.FileFilter convertForJavaIO() {
+    return new java.io.FileFilter() {
+      @Override
+      public boolean accept(File pathname) {
+        return FileExtensionFilter.this.accept(pathname);
+      }
+    };
+  }
+}