feat(generic) support generic map

- support encode es6 Map to java generic map

issue #44

Author: 宗羽

lib/v1/encoder.js

@@ -16,6 +16,8 @@ var utils = require('../utils');
 var javaObject = require('../object');
 var is = require('is-type-of');
 
+var SUPPORT_ES6_MAP = typeof Map === 'function' && typeof Map.prototype.forEach === 'function';
+
 function Encoder(options) {
   options = options || {};
   //array of buffer
@@ -263,12 +265,19 @@ proto._writeHashMap = function (obj) {
   // hashmap's type is null
   this.writeType('');
 
-  // hash map must sort keys
-  var keys = Object.keys(obj).sort();
-  for (var i = 0; i < keys.length; i++) {
-    var k = keys[i];
-    this.writeString(k);
-    this.write(obj[k]);
+  if (SUPPORT_ES6_MAP && obj instanceof Map) {
+    obj.forEach(function (value, key) {
+      this.write(key);
+      this.write(value);
+    }, this);
+  } else {
+    // hash map must sort keys
+    var keys = Object.keys(obj).sort();
+    for (var i = 0; i < keys.length; i++) {
+      var k = keys[i];
+      this.writeString(k);
+      this.write(obj[k]);
+    }
   }
   this.byteBuffer.put(0x7a);
   return this;

lib/v2/encoder.js

@@ -20,6 +20,8 @@ var util = require('util');
 var EncoderV1 = require('../v1/encoder');
 var javaObject = require('../object');
 
+var SUPPORT_ES6_MAP = typeof Map === 'function' && typeof Map.prototype.forEach === 'function';
+
 function Encoder(options) {
   EncoderV1.call(this, options);
 
@@ -574,12 +576,19 @@ proto._writeHashMap = function (obj) {
 
   this.byteBuffer.put(0x48); // H
 
-  // hash map must sort keys
-  var keys = Object.keys(obj).sort();
-  for (var i = 0; i < keys.length; i++) {
-    var k = keys[i];
-    this.writeString(k);
-    this.write(obj[k]);
+  if (SUPPORT_ES6_MAP && obj instanceof Map) {
+    obj.forEach(function (value, key) {
+      this.write(key);
+      this.write(value);
+    }, this);
+  } else {
+    // hash map must sort keys
+    var keys = Object.keys(obj).sort();
+    for (var i = 0; i < keys.length; i++) {
+      var k = keys[i];
+      this.writeString(k);
+      this.write(obj[k]);
+    }
   }
   this.byteBuffer.putChar('Z');
   return this;

test/fixtures/v1/map/generic.bin

@@ -0,0 +1 @@
+H�{��@=�@�{Z

test/fixtures/v2/map/generic.bin

@@ -161,6 +161,23 @@ describe('map.test.js', function () {
     });
   });
 
+  it('should write es6 Map to java.util.Map', function() {
+    var map = new Map();
+    map.set({ '$class': 'java.lang.Long', '$': 123 }, 123456);
+    map.set({ '$class': 'java.lang.Long', '$': 123456 }, 123);
+    var buf = hessian.encode(map);
+    buf.should.eql(utils.bytes('v1/map/generic'));
+
+    buf = hessian.encode({ '$class': 'java.util.HashMap', '$': map });
+    buf.should.eql(utils.bytes('v1/map/generic'));
+
+    // decode auto transfer key to string
+    hessian.decode(utils.bytes('v1/map/generic'), '1.0').should.eql({
+      '123': 123456,
+      '123456': 123
+    });
+  });
+
   describe('v2.0', function () {
     // map = new HashMap();
     // map.put(new Integer(1), "fee");
@@ -330,4 +347,24 @@ describe('map.test.js', function () {
     var rv = hessian.decode(data);
     rv.should.eql({null: 'null'});
   });
+
+  it('should write es6 Map to java.util.Map', function() {
+    var map = new Map();
+    map.set({ '$class': 'java.lang.Long', '$': 123 }, 123456);
+    map.set({ '$class': 'java.lang.Long', '$': 123456 }, 123);
+    var encoder = new hessian.EncoderV2();
+    var buf = encoder.write(map).get();
+    buf.should.eql(utils.bytes('v2/map/generic'));
+
+    encoder.reset();
+
+    buf = encoder.write({ '$class': 'java.util.HashMap', '$': map }).get();
+    buf.should.eql(utils.bytes('v2/map/generic'));
+
+    // decode auto transfer key to string
+    hessian.decode(utils.bytes('v2/map/generic'), '2.0').should.eql({
+      '123': 123456,
+      '123456': 123
+    });
+  });
 });