Added input file chooser

src/main/java/ru/ras/iph/impose/FileChooser.java

@@ -0,0 +1,23 @@
+package ru.ras.iph.impose;
+
+import java.io.File;
+import javax.swing.JFileChooser;
+import javax.swing.JFrame;
+public class FileChooser extends JFrame {
+	public static void main(String [] args){
+		chooseFile();
+	}
+	public static File chooseFile(){
+		File selected = null;
+		JFileChooser fileChooser = new JFileChooser();
+		fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
+		int result = fileChooser.showOpenDialog(null);
+		if (result == fileChooser.APPROVE_OPTION){
+			selected = fileChooser.getSelectedFile();
+			System.out.println("Selected file " + selected.getAbsolutePath());
+		}
+		return selected;
+
+	}
+
+}

src/main/java/ru/ras/iph/impose/ImposeonA3.java

@@ -25,11 +25,16 @@ public class ImposeonA3 {
     public static void main(String[] args) throws IOException, DocumentException {
     	if (args.length != 1) {
 			System.err.println("Usage: java -jar impose.jar input_file.pdf");
-			System.exit(1);
-		}
-    	String inputFileName = args[0];
-    	File inputFile = new File(inputFileName);
-    	if (!inputFile.exists()){
+			}
+    	File inputFile = null;
+    	if (args.length == 1){
+    		String inputFileName = args[0];
+      	inputFile = new File(inputFileName);	
+    	} else {
+    		inputFile = FileChooser.chooseFile();
+    	}
+
+    	if (inputFile == null || !inputFile.exists()){
     		System.err.println("Input file not found!");
 			System.exit(1);
     	}
@@ -290,11 +295,17 @@ public static void main(String[] args) throws IOException, DocumentException {
         document.close();
         reader.close();
     }
- private static void drawSerifs(PdfContentByte canvas) {
+ /**
+ * @param canvas
+ */
+private static void drawSerifs(PdfContentByte canvas) {
 
 	 canvas.stroke();
  }
- private static void drawFoldLines(PdfContentByte canvas) {
+ /**
+ * @param canvas
+ */
+private static void drawFoldLines(PdfContentByte canvas) {
 	 canvas.moveTo(3,595.5);
      canvas.lineTo(30,595.5);
      canvas.moveTo(812,595.5);
@@ -306,7 +317,10 @@ private static void drawFoldLines(PdfContentByte canvas) {
      canvas.stroke();
 
  }
- private static void drawRectangle2(PdfContentByte canvas){
+ /**
+ * @param canvas
+ */
+private static void drawRectangle2(PdfContentByte canvas){
 	 int startX = 782;
 	 int startY = 587;
 	 canvas.moveTo(startX,startY);
@@ -317,7 +331,10 @@ private static void drawRectangle2(PdfContentByte canvas){
      canvas.fillStroke();
      canvas.stroke();
  }
- private static void drawRectangle4(PdfContentByte canvas){
+ /**
+ * @param canvas
+ */
+private static void drawRectangle4(PdfContentByte canvas){
 	 int startX = 413;
 	 int startY = 590;
 	 canvas.moveTo(startX,startY);
@@ -329,6 +346,10 @@ private static void drawRectangle4(PdfContentByte canvas){
      canvas.stroke();
  }
 
+	/**
+	 * @param canvas
+	 * @param layout
+	 */
 	private static void drawSerifs4(PdfContentByte canvas, int layout) {
 		float xl = 413f;
 		float xr = 430f;
@@ -347,6 +368,10 @@ private static void drawSerifs4(PdfContentByte canvas, int layout) {
 
 	}
 
+	/**
+	 * @param canvas
+	 * @param layout
+	 */
 	private static void drawSerifs2(PdfContentByte canvas, int layout) {
 		float yt = 587f;
 		float yb = 604f;