Add optional omit zero

Author: caoli5288

src/main/java/com/jsoniter/output/ReflectionObjectEncoder.java

@@ -59,10 +59,14 @@ private void enocde_(Object obj, JsonStream stream) throws Exception {
         }
         stream.writeObjectStart();
         boolean notFirst = false;
+        boolean omitZero = JsoniterSpi.getCurrentConfig().omitZero();
         for (Binding field : desc.fields) {
             Object val = field.field.get(obj);
             for (String toName : field.toNames) {
                 if (!(field.shouldOmitNull && val == null)) {
+                    if (omitZero && val instanceof Number && ((Number) val).doubleValue() == 0) {
+                        continue;
+                    }
                     if (notFirst) {
                         stream.writeMore();
                     } else {
@@ -81,6 +85,9 @@ private void enocde_(Object obj, JsonStream stream) throws Exception {
             Object val = getter.method.invoke(obj);
             for (String toName : getter.toNames) {
                 if (!(getter.shouldOmitNull && val == null)) {
+                    if (omitZero && val instanceof Number && ((Number) val).doubleValue() == 0) {
+                        continue;
+                    }
                     if (notFirst) {
                         stream.writeMore();
                     } else {

src/main/java/com/jsoniter/spi/Config.java

@@ -76,6 +76,10 @@ public int indentionStep() {
         return builder.indentionStep;
     }
 
+    public boolean omitZero() {
+        return builder.omitZero;
+    }
+
     public boolean escapeUnicode() {
         return builder.escapeUnicode;
     }
@@ -90,6 +94,7 @@ public static class Builder {
         private EncodingMode encodingMode;
         private int indentionStep;
         private boolean escapeUnicode = true;
+        private boolean omitZero;
 
         public Builder() {
             String envMode = System.getenv("JSONITER_DECODING_MODE");
@@ -121,6 +126,11 @@ public Builder indentionStep(int indentionStep) {
             return this;
         }
 
+        public Builder omitZero(boolean b) {
+            omitZero = b;
+            return this;
+        }
+
         public Builder escapeUnicode(boolean escapeUnicode) {
             this.escapeUnicode = escapeUnicode;
             return this;
@@ -159,6 +169,7 @@ public boolean equals(Object o) {
             if (indentionStep != builder.indentionStep) return false;
             if (escapeUnicode != builder.escapeUnicode) return false;
             if (decodingMode != builder.decodingMode) return false;
+            if (omitZero != builder.omitZero) return false;
             return encodingMode == builder.encodingMode;
         }
 
@@ -168,6 +179,7 @@ public int hashCode() {
             result = 31 * result + (encodingMode != null ? encodingMode.hashCode() : 0);
             result = 31 * result + indentionStep;
             result = 31 * result + (escapeUnicode ? 1 : 0);
+            result = 31 * result + (omitZero ? 1 : 0);
             return result;
         }
 
@@ -177,6 +189,7 @@ public Builder copy() {
             builder.decodingMode = decodingMode;
             builder.indentionStep = indentionStep;
             builder.escapeUnicode = escapeUnicode;
+            builder.omitZero = omitZero;
             return builder;
         }
     }