How to use

createReader

method

in

processing.core.PApplet

/**
 * Initializes a new OBJ Object with the given filename.
 */
public PShapeOBJ(PApplet parent, String filename) {
 this(parent, parent.createReader(filename));
}

/**
 * Shouldn't be part of main p5 reference, this is for advanced users.
 * Note that while it doesn't accept anything but UTF-8, this is preserved
 * so that we have some chance of implementing that in the future.
 *
 * @nowebref
 */
public XML(InputStream input, String options) throws IOException, ParserConfigurationException, SAXException {
 this(PApplet.createReader(input), options);
}

/**
 * Advanced users only; use loadXML() in PApplet.
 *
 * @nowebref
 */
public XML(File file, String options) throws IOException, ParserConfigurationException, SAXException {
 this(PApplet.createReader(file), options);
}

/**
 * Advanced users only; see loadXML() in PApplet.
 *
 * @nowebref
 */
public XML(File file, String options) throws IOException, ParserConfigurationException, SAXException {
 this(PApplet.createReader(file), options);
}

/**
 * @nowebref
 */
static public BufferedReader createReader(File file) {
 try {
  InputStream is = new FileInputStream(file);
  if (file.getName().toLowerCase().endsWith(".gz")) {
   is = new GZIPInputStream(is);
  }
  return createReader(is);
 } catch (IOException e) {
  // Re-wrap rather than forcing novices to learn about exceptions
  throw new RuntimeException(e);
 }
}

/**
 * @nowebref
 */
static public JSONObject loadJSONObject(File file) {
 return new JSONObject(createReader(file));
}

/**
 * Initializes a new OBJ Object with the given filename.
 */
public PShapeOBJ(PApplet parent, String filename) {
 this(parent, parent.createReader(filename), getBasePath(parent, filename));
}

/**
 * @webref input:files
 * @param filename name of a file in the data folder or a URL
 * @see JSONArray
 * @see PApplet#loadJSONObject(String)
 * @see PApplet#saveJSONObject(JSONObject, String)
 * @see PApplet#saveJSONArray(JSONArray, String)
 */
public JSONArray loadJSONArray(String filename) {
 return new JSONArray(createReader(filename));
}

static public JSONArray loadJSONArray(File file) {
 return new JSONArray(createReader(file));
}

/**
 * @webref input:files
 * @param filename name of a file in the data folder or a URL
 * @see JSONObject
 * @see JSONArray
 * @see PApplet#loadJSONArray(String)
 * @see PApplet#saveJSONObject(JSONObject, String)
 * @see PApplet#saveJSONArray(JSONArray, String)
 */
public JSONObject loadJSONObject(String filename) {
 return new JSONObject(createReader(filename));
}

/**
 * @webref input:files
 * @param filename name of a file in the data folder or a URL
 * @see JSONObject
 * @see JSONArray
 * @see PApplet#loadJSONArray(String)
 * @see PApplet#saveJSONObject(JSONObject, String)
 * @see PApplet#saveJSONArray(JSONArray, String)
 */
public JSONObject loadJSONObject(String filename) {
 return new JSONObject(createReader(filename));
}

/**
 * @webref input:files
 * @param filename name of a file in the data folder or a URL
 * @see JSONArray
 * @see PApplet#loadJSONObject(String)
 * @see PApplet#saveJSONObject(JSONObject, String)
 * @see PApplet#saveJSONArray(JSONArray, String)
 */
public JSONArray loadJSONArray(String filename) {
 return new JSONArray(createReader(filename));
}

static public JSONObject loadJSONObject(File file) {
 return new JSONObject(createReader(file));
}

static public JSONArray loadJSONArray(File file) {
 return new JSONArray(createReader(file));
}

/**
 * @nowebref
 */
public XML loadXML(String filename, String options) {
 try {
  return new XML(createReader(filename), options);
  // can't use catch-all exception, since it might catch the
  // RuntimeException about the incorrect case sensitivity
 } catch (IOException e) {
  throw new RuntimeException(e);
 } catch (ParserConfigurationException e) {
  throw new RuntimeException(e);
 } catch (SAXException e) {
  throw new RuntimeException(e);
 }
}

/**
 * I want to read lines from a file. And I'm still annoyed.
 */
static public BufferedReader createReader(File file) {
  try {
    InputStream is = new FileInputStream(file);
    if (file.getName().toLowerCase().endsWith(".gz")) {
      is = new GZIPInputStream(is);
    }
    return createReader(is);
  } catch (Exception e) {
    if (file == null) {
      throw new RuntimeException("File passed to createReader() was null");
    } else {
      e.printStackTrace();
      throw new RuntimeException("Couldn't create a reader for " +
          file.getAbsolutePath());
    }
  }
  //return null;
}

/**
 * I want to read lines from a file. I have RSI from typing these
 * eight lines of code so many times.
 */
public BufferedReader createReader(String filename) {
  try {
    InputStream is = createInput(filename);
    if (is == null) {
      System.err.println(filename + " does not exist or could not be read");
      return null;
    }
    return createReader(is);
  } catch (Exception e) {
    if (filename == null) {
      System.err.println("Filename passed to reader() was null");
    } else {
      System.err.println("Couldn't create a reader for " + filename);
    }
  }
  return null;
}

/**
 * ( begin auto-generated from createReader.xml )
 *
 * Creates a <b>BufferedReader</b> object that can be used to read files
 * line-by-line as individual <b>String</b> objects. This is the complement
 * to the <b>createWriter()</b> function.
 * <br/> <br/>
 * Starting with Processing release 0134, all files loaded and saved by the
 * Processing API use UTF-8 encoding. In previous releases, the default
 * encoding for your platform was used, which causes problems when files
 * are moved to other platforms.
 *
 * ( end auto-generated )
 * @webref input:files
 * @param filename name of the file to be opened
 * @see BufferedReader
 * @see PApplet#createWriter(String)
 * @see PrintWriter
 */
public BufferedReader createReader(String filename) {
 InputStream is = createInput(filename);
 if (is == null) {
  System.err.println("The file \"" + filename + "\" " +
           "is missing or inaccessible, make sure " +
           "the URL is valid or that the file has been " +
           "added to your sketch and is readable.");
  return null;
 }
 return createReader(is);
}

int result = -1;
try {
 BufferedReader out = createReader(p.getInputStream());
 BufferedReader err = createReader(p.getErrorStream());
 result = p.waitFor();
 String line;

BufferedReader reader = PApplet.createReader(input);
if (awfulCSV) {
 parseAwfulCSV(reader, header);