Add PrinterFeatures

src/main/java/com/github/anastaciocintra/escpos/EscPos.java

@@ -122,6 +122,7 @@ private PinConnector(int value) {
     protected OutputStream outputStream;
     protected String charsetName;
     protected Style style;
+    protected PrinterFeatures printerFeatures;
 
     /**
      * creates an instance based on outputStream.
@@ -130,9 +131,20 @@ private PinConnector(int value) {
      * @see java.io.OutputStream
      */
     public EscPos(OutputStream outputStream) {
+        this(outputStream, new PrinterFeatures());
+    }
+
+    /**
+     * creates an instance based on outputStream with a given set of PrinterFeatures
+     * @param outputStream can be one file, System.out or printer...
+     * @param printerFeatures a set of feature toggles for the used printer
+     * @see java.io.OutputStream
+     */
+    public EscPos(OutputStream outputStream, PrinterFeatures printerFeatures) {
         this.outputStream = outputStream;
         this.setCharsetName(CharacterCodeTable.CP437_USA_Standard_Europe.charsetName);
         style = new Style();
+        this.printerFeatures = printerFeatures;
     }
 
     /**
@@ -232,6 +244,24 @@ public Style getStyle() {
         return style;
     }
 
+    /**
+     * Gets the supported features
+     * @return the actual value
+     * @see PrinterFeatures
+     */
+    public PrinterFeatures getPrinterFeatures() {
+        return printerFeatures;
+    }
+
+    /**
+     * Sets the supported features
+     * @param printerFeatures the actual value
+     * @see PrinterFeatures
+     */
+    public void setPrinterFeatures(PrinterFeatures printerFeatures) {
+        this.printerFeatures = printerFeatures;
+    }
+
     /**
      * Set charsetName used on encodes of Strings.
      *
@@ -320,7 +350,7 @@ public EscPos setPrinterCharacterTable(int characterCodeTable) throws IOExceptio
      * @see #setCharsetName(java.lang.String)
      */
     public EscPos write(Style style, String text) throws UnsupportedEncodingException, IOException {
-        byte[] configBytes = style.getConfigBytes();
+        byte[] configBytes = style.getConfigBytes(printerFeatures);
         write(configBytes, 0, configBytes.length);
         this.outputStream.write(text.getBytes(charsetName));
         return this;
@@ -482,7 +512,7 @@ public EscPos feed(Style style, int nLines) throws IOException, IllegalArgumentE
         if (nLines < 1 || nLines > 255) {
             throw new IllegalArgumentException("nLines must be between 1 and 255");
         }
-        byte[] configBytes = style.getConfigBytes();
+        byte[] configBytes = style.getConfigBytes(printerFeatures);
         write(configBytes, 0, configBytes.length);
         for(int n = 0; n < nLines; n++){
             write(LF);

src/main/java/com/github/anastaciocintra/escpos/PrinterFeatures.java

@@ -0,0 +1,22 @@
+package com.github.anastaciocintra.escpos;
+
+/**
+ * Bundles a number of feature toggles to influence the behaviour of the {@link EscPos} class
+ */
+public class PrinterFeatures {
+    private final boolean fonts;
+
+
+    public PrinterFeatures() {
+        this(true);
+    }
+
+    public PrinterFeatures(boolean fonts) {
+        this.fonts = fonts;
+    }
+
+
+    public boolean supportsFonts() {
+        return fonts;
+    }
+}

src/main/java/com/github/anastaciocintra/escpos/Style.java

@@ -134,7 +134,7 @@ public final void reset() {
      *
      * @param fontName used on ESC M n
      * @return this object
-     * @see #getConfigBytes()
+     * @see #getConfigBytes(PrinterFeatures)
      */
     public final Style setFontName(FontName fontName) {
         this.fontName = fontName;
@@ -158,7 +158,7 @@ public final Style setBold(boolean bold) {
      * @param fontWidth value used on GS ! n
      * @param fontHeight value used on GS ! n
      * @return this object
-     * @see #getConfigBytes()
+     * @see #getConfigBytes(PrinterFeatures)
      */
     public final Style setFontSize(FontSize fontWidth, FontSize fontHeight) {
         this.fontWidth = fontWidth;
@@ -171,7 +171,7 @@ public final Style setFontSize(FontSize fontWidth, FontSize fontHeight) {
      *
      * @param underline value used on ESC – n
      * @return this object
-     * @see #getConfigBytes()
+     * @see #getConfigBytes(PrinterFeatures)
      */
     public final Style setUnderline(Underline underline) {
         this.underline = underline;
@@ -183,7 +183,7 @@ public final Style setUnderline(Underline underline) {
      *
      * @param justification value used on ESC a n
      * @return this object
-     * @see #getConfigBytes()
+     * @see #getConfigBytes(PrinterFeatures)
      */
     public final Style setJustification(Justification justification) {
         this.justification = justification;
@@ -196,7 +196,7 @@ public final Style setJustification(Justification justification) {
      * @param lineSpacing value used on ESC 3 n
      * @return this object
      * @throws IllegalArgumentException when lineSpacing is not between 0 and 255.
-     * @see #getConfigBytes()
+     * @see #getConfigBytes(PrinterFeatures)
      */
     public final Style setLineSpacing(int lineSpacing) throws IllegalArgumentException {
         if (lineSpacing < 0 || lineSpacing > 255) {
@@ -211,7 +211,7 @@ public final Style setLineSpacing(int lineSpacing) throws IllegalArgumentExcepti
      * Reset line spacing to printer default used on ESC 2
      *
      * @return this object
-     * @see #getConfigBytes()
+     * @see #getConfigBytes(PrinterFeatures)
      */
     public final Style resetLineSpacing() {
         this.defaultLineSpacing = true;
@@ -230,6 +230,9 @@ public final Style setColorMode(ColorMode colorMode) {
         return this;
     }
 
+
+
+
     /**
      * Configure font Style.
      * <p>
@@ -275,11 +278,62 @@ public final Style setColorMode(ColorMode colorMode) {
      * @exception IOException if an I/O error occurs.
      */
     public byte[] getConfigBytes() throws IOException {
+        return getConfigBytes(new PrinterFeatures());
+    }
+
+    /**
+     * Configure font Style.
+     * <p>
+     * Select character font.
+     * <p>
+     * ASCII ESC M n
+     * <p>
+     *
+     * Turn emphasized(bold) mode on/off.
+     * <p>
+     * ASCII ESC E n
+     * <p>
+     *
+     * set font size.
+     * <p>
+     * ASCII GS ! n
+     * <p>
+     *
+     * select underline mode
+     * <p>
+     * ASCII ESC – n
+     * <p>
+     *
+     * Select justification
+     * <p>
+     * ASCII ESC a n
+     * <p>
+     *
+     * Select default line spacing
+     * <p>
+     * ASCII ESC 2
+     * <p>
+     *
+     * Set line spacing
+     * <p>
+     * ASCII ESC 3 n
+     * <p>
+     *
+     * Turn white/black reverse print mode on/off<p>
+     * ASCII GS B n
+     *
+     * @param printerFeatures Toggle certain Style Features
+     * @return ESC/POS commands to configure style
+     * @exception IOException if an I/O error occurs.
+     */
+    public byte[] getConfigBytes(PrinterFeatures printerFeatures) throws IOException {
         ByteArrayOutputStream bytes = new ByteArrayOutputStream();
-        //
-        bytes.write(ESC);
-        bytes.write('M');
-        bytes.write(fontName.value);
+        if(printerFeatures.supportsFonts()) {
+            //
+            bytes.write(ESC);
+            bytes.write('M');
+            bytes.write(fontName.value);
+        }
         //
         bytes.write(ESC);
         bytes.write('E');