Add optional omit zero in dynamic codegen

Author: caoli5288

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

@@ -87,6 +87,7 @@ private static int genField(CodegenResult ctx, Binding binding, String toName, i
  isCollectionValueNullable = true;
  }
  boolean nullable = !valueClazz.isPrimitive();
+ boolean omitZero = JsoniterSpi.getCurrentConfig().omitZero();
  if (!binding.isNullable) {
  nullable = false;
  }
@@ -108,19 +109,30 @@ private static int genField(CodegenResult ctx, Binding binding, String toName, i
  ctx.append(String.format("if (%s == null) { stream.writeNull(); } else {", valueAccessor));
  }
  } else {
- notFirst = appendComma(ctx, notFirst);
- ctx.buffer('"');
- ctx.buffer(toName);
- ctx.buffer('"');
- ctx.buffer(':');
+ if (encoder == null && valueClazz.isPrimitive() && !(valueClazz == String.class) && omitZero) {
+ if (notFirst == 0) {
+ notFirst = 2;
+ ctx.append("boolean notFirst = false;");
+ }
+ String t = CodegenImplNative.getTypeName(binding.valueType);
+ ctx.append(String.format("if (!(((%s)%s) == 0)) {", t, valueAccessor));
+ appendComma(ctx, notFirst);
+ ctx.append(CodegenResult.bufferToWriteOp("\"" + toName + "\":"));
+ } else {
+ notFirst = appendComma(ctx, notFirst);
+ ctx.buffer('"');
+ ctx.buffer(toName);
+ ctx.buffer('"');
+ ctx.buffer(':');
+ }
  }
  if (encoder == null) {
  CodegenImplNative.genWriteOp(ctx, valueAccessor, binding.valueType, nullable, isCollectionValueNullable);
  } else {
  ctx.append(String.format("com.jsoniter.output.CodegenAccess.writeVal(\"%s\", %s, stream);",
  fieldCacheKey, valueAccessor));
  }
- if (nullable) {
+ if (nullable || omitZero) {
  ctx.append("}");
  }
  return notFirst;