package example8_3_FileOpening;

import java.io.*;

public class OpeningBinaryFilesExample {
    public static void main(String[] args) {

        // Ways to open a binary file.
        // All of them throw a FileNotFoundException.
        try {
            // 1
            File f1 = new File("D:\\MyDocs\\Desktop\\Example.txt");
            InputStream inputStream1 = new FileInputStream(f1);

            // 2
            File f2 = new File("D:\\MyDocs\\Desktop\\ExampleFoo.txt");
            if(f2.isFile()) {
                FileInputStream fileInputStream2 = new FileInputStream(f2);
                // NOTE: You still have to surround it with the try-catch block.
                // Because although we know the file is there, the method still
                // "throws" a FileNotFoundException.
            } else {
                System.err.println("Warning: Could not open file.");
                System.out.println("Warning: Could not find file.");
            }

            // 3
            InputStream inputStream3 = new FileInputStream("D:\\MyDocs\\Desktop\\Example.txt");

            // 4
            FileInputStream fileInputStream4 = new FileInputStream("D:\\MyDocs\\Desktop\\Example.txt");

            // 5
            // Make your own!  This list is far from exhaustive!
        } catch (FileNotFoundException e) {
            System.out.println("An error occurred while attempting to open one of the files: "+e.getMessage());
        }

        //File file = new File("D:\\MyDocs\\Desktop\\Example.txt"); //
        File file = new File("D:\\MyDocs\\Desktop\\Java.txt"); //
        boolean isDir = file.isDirectory();
        System.out.println("Is it a directory? "+isDir); // Should be false -- it's a file, not a directory.

        boolean isFile = file.isFile();
        System.out.println("Is it a \"normal\" file? "+isFile); // Should be false -- it's a file, not a directory.

        InputStream inputStream = null;
        try {
            inputStream = new FileInputStream(file);
        } catch (FileNotFoundException e) {
            System.err.println("Warning: We could not find the file!");
        }

        if(null != inputStream) {

            int myByte;
            int count = 0;
            try {
                for(; (myByte = inputStream.read()) != -1; count ++) {
                    String asCharString;
                    if(myByte < 0x20) {
                        asCharString = "Non-printing character";
                    } else {
                        asCharString = "as char: "+(char)myByte;
                    }
                    System.out.println("Byte index "+count+": "+Integer.toHexString(myByte)+" ("+asCharString+")");
                }
            } catch (IOException e) {
                System.err.println("Warning: IOException occured while processing the input stream, while attempting " +
                        "to read byte "+count+" Message: "+e.getMessage());
            }
        }
    }
}