Appendables

In order to allow for mostly garbage-free behavior, standard Java string concatenation using the “+” operator is not ideal. Pronghorn has its own Appendables class that allows for garbage-free, single pass creation of text.
The API follows a fluent pattern where every method returns the same Appendable which was passed in. It is located in PronghornPipes.
Examples
Append Array
Append an array to a StringBuilder
byte[] a = new byte[1000];
Random r = new Random(101);
r.nextBytes(a);
StringBuilder str = new StringBuilder();
Appendables.appendArray(str, a);
Append Value
Append value(s) to an existing StringBuilder
StringBuilder str = new StringBuilder();
Appendables.appendValue(str, "Label: ", 5, " -Suffix");
Append Fixed Decimal Digits
Append fixed decimals to a StringBuilder
StringBuilder str = new StringBuilder();
Appendables.appendFixedDecimalDigits(str, -42,10 );
Append Base64-encoded String
Creates a Base64-encoded String and appends it
String value = "Man is distinguished, not only by his reason, but by this singular passion from "
	    	+"other animals, which is a lust of the mind, that by a perseverance of delight "
	    	+"in the continued and indefatigable generation of knowledge, exceeds the short "
	    	+"vehemence of any carnal pleasure.";
​
byte[] b = value.getBytes();
​
StringBuilder str = new StringBuilder();
Appendables.appendBase64(str, b, 0, b.length, Integer.MAX_VALUE);
Append Base64-decoded String
Decodes a Base64 string and writes it to target
String value = "TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlz"
               +"IHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2Yg"
               +"dGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGlu"
               +"dWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRo"
               +"ZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4=";
​
byte[] encBytes = value.getBytes();
byte[] target = new byte[value.length()];
​
Appendables.decodeBase64(encBytes, 0, encBytes.length, Integer.MAX_VALUE, target, 0, Integer.MAX_VALUE);
Append Epoch Time
Append an epoch time to a string
StringBuilder str = new StringBuilder();
Appendables.appendEpochTime(str, 10000); //10 seconds
Append Hex Value
Convert an integer to its hex value and append that to the StringBuilder
StringBuilder str = new StringBuilder();
int value = 400;
​
Appendables.appendHexDigits(str, value);
Append Hex Fixed Value
Convert an integer to its fixed hex value and append that to the StringBuilder
StringBuilder str = new StringBuilder();
int value = 400;
int bits = 8;
​
Appendables.appendFixedHexDigits(str, value, bits);
Append Hex Array
Add hex array to the StringBuilder
int[] a = new int[1000];
Random rand = new Random(101);
​
byte [] b = new byte[1000];
rand.nextBytes(b);
​
for(int i = 0;i<a.length;i++){
  a[i] = rand.nextInt(0x10) + 0x10;  // Generates a random number between 0x10 and 0x20
}
​
StringBuilder str = new StringBuilder();
Appendables.appendHexArray(str, 'L', a, 0, 0xFF, 'R', a.length);
Chapter 5: Utility Classes
Bloom Filter
Last updated 11 months ago