File Descriptor for file extensions

platform/platform-api/src/com/intellij/openapi/fileChooser/FileTypeDescriptor.java

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+/*
+ * Copyright 2000-2010 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.openapi.fileChooser;
+
+import com.intellij.openapi.vfs.VirtualFile;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+/**
+ * @author Konstantin Bulenkov
+ */
+public class FileTypeDescriptor extends FileChooserDescriptor {
+  private final ArrayList<String> ext;
+
+  public FileTypeDescriptor(String title, @NotNull String... extensions) {
+    super(true, false, false, true, false, false);
+    assert extensions.length > 0 : "There should be at least one extension";
+    ext = new ArrayList<String>(Arrays.asList(extensions));
+    setTitle(title);
+  }
+
+  @Override
+  public boolean isFileVisible(VirtualFile file, boolean showHiddenFiles) {
+    final String ex = file.getExtension();
+    return file.isDirectory() || (ex != null && ext.contains(ex.toLowerCase()));
+  }
+
+  @Override
+  public boolean isFileSelectable(VirtualFile file) {
+    return !file.isDirectory() && isFileVisible(file, true);
+  }
+}