[LIB-9] Add functional for build image chess diagrams

[chesshog.git] / src / main / java / org / hedgecode / chess / img / ImageFilter.java

diff --git a/src/main/java/org/hedgecode/chess/img/ImageFilter.java b/src/main/java/org/hedgecode/chess/img/ImageFilter.java
new file mode 100644 (file)
index 0000000..27c238e
--- /dev/null
+++ b/src/main/java/org/hedgecode/chess/img/ImageFilter.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2018-2019. Developed by Hedgecode.
+ *
+ * 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 org.hedgecode.chess.img;
+
+import java.io.File;
+import java.io.FilenameFilter;
+
+/**
+ *
+ *
+ * @author Dmitry Samoshin aka gotty
+ */
+public class ImageFilter implements FilenameFilter {
+
+    private static final String[] IMAGES_EXTS = ImageFormat.getAllExts();
+
+    private String[] names;
+
+    public ImageFilter() {
+        this.names = null;
+    }
+
+    public ImageFilter(String[] names) {
+        this.names = names;
+    }
+
+    @Override
+    public boolean accept(File dir, String name) {
+        return isImageName(name) && isImageExt(name);
+    }
+
+    private boolean isImageName(String name) {
+        if (names != null) {
+            name = name.substring(0, name.lastIndexOf('.'));
+            for (String imageName : names) {
+                if (imageName.equalsIgnoreCase(name))
+                    return true;
+            }
+            return false;
+        }
+        return true;
+    }
+
+    private boolean isImageExt(String ext) {
+        ext = ext.substring(ext.lastIndexOf('.') + 1);
+        for (String imageExt : IMAGES_EXTS) {
+            if (imageExt.equalsIgnoreCase(ext))
+                return true;
+        }
+        return false;
+    }
+
+}