enhance memory usage using buffer, or avoiding alloc

jansi/src/main/java/org/fusesource/jansi/Ansi.java

@@ -356,7 +356,7 @@ public Ansi reset() {
     private final ArrayList<Integer> attributeOptions = new ArrayList<Integer>(5);
 
     public Ansi() {
-        this(new StringBuilder());
+        this(new StringBuilder(80));
     }
 
     public Ansi(Ansi parent) {

jansi/src/main/java/org/fusesource/jansi/AnsiOutputStream.java

@@ -134,7 +134,7 @@ public synchronized void write(int data) throws IOException { // expected diff w
                 buffer[pos++] = (byte) data;
                 if (!('0' <= data && data <= '9')) {
                     String strValue = new String(buffer, startOfValue, (pos - 1) - startOfValue, Charset.defaultCharset());
-                    Integer value = new Integer(strValue);
+                    Integer value = Integer.valueOf(strValue);
                     options.add(value);
                     if (data == ';') {
                         state = LOOKING_FOR_NEXT_ARG;
@@ -171,7 +171,7 @@ public synchronized void write(int data) throws IOException { // expected diff w
                 buffer[pos++] = (byte) data;
                 if (';' == data) {
                     String strValue = new String(buffer, startOfValue, (pos - 1) - startOfValue, Charset.defaultCharset());
-                    Integer value = new Integer(strValue);
+                    Integer value = Integer.valueOf(strValue);
                     options.add(value);
                     startOfValue = pos;
                     state = LOOKING_FOR_OSC_PARAM;

jansi/src/main/java/org/fusesource/jansi/AnsiPrintStream.java

@@ -126,7 +126,7 @@ protected synchronized boolean filter(int data) { // expected diff with AnsiOutp
                 buffer[pos++] = (byte) data;
                 if (!('0' <= data && data <= '9')) {
                     String strValue = new String(buffer, startOfValue, (pos - 1) - startOfValue, Charset.defaultCharset());
-                    Integer value = new Integer(strValue);
+                    Integer value = Integer.valueOf(strValue);
                     options.add(value);
                     if (data == ';') {
                         state = LOOKING_FOR_NEXT_ARG;
@@ -163,7 +163,7 @@ protected synchronized boolean filter(int data) { // expected diff with AnsiOutp
                 buffer[pos++] = (byte) data;
                 if (';' == data) {
                     String strValue = new String(buffer, startOfValue, (pos - 1) - startOfValue, Charset.defaultCharset());
-                    Integer value = new Integer(strValue);
+                    Integer value = Integer.valueOf(strValue);
                     options.add(value);
                     startOfValue = pos;
                     state = LOOKING_FOR_OSC_PARAM;

jansi/src/main/java/org/fusesource/jansi/AnsiRenderer.java

@@ -60,7 +60,7 @@ public class AnsiRenderer {
 
     public static String render(final String input) throws IllegalArgumentException {
         try {
-            return render(input, new StringBuilder()).toString();
+            return render(input, new StringBuilder(input.length())).toString();
         } catch (IOException e) {
             // Cannot happen because StringBuilder does not throw IOException
             throw new IllegalArgumentException(e);

jansi/src/main/java/org/fusesource/jansi/AnsiString.java

@@ -39,7 +39,7 @@ public AnsiString(final CharSequence str) {
     private CharSequence chew(final CharSequence str) {
         assert str != null;
 
-        ByteArrayOutputStream buff = new ByteArrayOutputStream();
+        ByteArrayOutputStream buff = new ByteArrayOutputStream(str.length());
         AnsiOutputStream out = new AnsiOutputStream(buff);
 
         try {

jansi/src/main/java/org/fusesource/jansi/FilterPrintStream.java

@@ -29,8 +29,13 @@
 public class FilterPrintStream extends PrintStream
 {
     private static final String NEWLINE = System.getProperty("line.separator");
+
+    private static final int TMP_STR_TO_CHAR_BUFFER_LENGTH = 400;
+
     protected final PrintStream ps;
 
+    private final char[] strToCharBuffer = new char[TMP_STR_TO_CHAR_BUFFER_LENGTH];
+
     public FilterPrintStream(PrintStream ps)
     {
         super( new OutputStream() {
@@ -103,7 +108,7 @@ private void write(char buf[]) {
     }
 
     private void write(String s) {
-        char[] buf = new char[s.length()];
+        char[] buf = (s.length() < strToCharBuffer.length)? strToCharBuffer : new char[s.length()];
         s.getChars(0, s.length(), buf, 0);
         write(buf);
     }
@@ -121,7 +126,12 @@ public void print(boolean b) {
 
     @Override
     public void print(char c) {
-        write(String.valueOf(c));
+        // optim for: write(String.valueOf(c));
+        if (filter(c))
+        {
+            ps.print(c);
+        }
+
     }
 
     @Override