Can JacksonFactory have methods to configure the parser?

[suztomo]

Can com.google.api.client.json.jackson2.JacksonFactory have methods to configure the parser?

Is your feature request related to a problem? Please describe.

I'm always frustrated when I write escaped double quotes in Java String literal, especially when writing test cases for JSON.

        "{\"cumulative\":true, \"integer\":{\"highBits\":0, \"lowBits\":0}, "
            + "\"nameAndKind\":{\"kind\":\"SUM\", "
            + "\"name\":\"transformedValue-ElementCount\"}}"

Concrete example: suztomo/beam@74e9335#diff-d2f80ee068a253407b9347a92b0f49a5L119

As com.google.api.client.json.jackson2.JacksonFactory does not provide API to configure the parser, I had to implement my own JacksonFactory and JacksonParser for my POC above (NonstrictJacksonFactory and MyJacksonParser).

Describe the solution you'd like

In my test cases, I want to write JSON key without double-quotes and strings in JSON with single quotes. I wish JacksonFactory allows me to set the following options:

      this.factory.configure(ALLOW_UNQUOTED_FIELD_NAMES, true);
      this.factory.configure(ALLOW_SINGLE_QUOTES, true);

With these configuration, the example JSON text above can be written as:

        "{cumulative:true, integer:{highBits:0, lowBits:0}, "
            + "nameAndKind:{kind:'SUM', "
            + "name:'transformedValue-ElementCount'}}"

This is much easier to read compared to previous example of many escape characters.

Describe alternatives you've considered
Write test case with double-quotes escaped:

        "{\"cumulative\":true, \"integer\":{\"highBits\":0, \"lowBits\":0}, "
            + "\"nameAndKind\":{\"kind\":\"SUM\", "
            + "\"name\":\"transformedValue-ElementCount\"}}"

Write test case with ImmutableMap.of:

    ImmutableMap<String, Object> expected = ImmutableMap.of("cumulative", true,
        "integer", ImmutableMap.of("highBits", 0, "lowBits", 0L),
        "nameAndKind", ImmutableMap.of("kind", "SUM", "name", "transformedValue-ElementCount"));
    assertEquals(expected, result);

(Thanks @BenWhitehead !)

Additional context

I was trying to enhance Apache Beam's test cases that relies on toString() of objects.
suztomo/beam@314b74b . I came up with my assertEqualsOnJson method but still do not like the escaped double quotes in test assertions.

[codyoss]

Maybe wrapping JsonNode with some sort of builder pattern would work make this easier to write?

[suztomo]

@codyoss Thank you for response. I ended up converting objects into JSON text and then asserts with JSONassert library. (Not the other way around)
https://github.com/apache/beam/pull/10441/files#diff-51b7cac6d770ee64a9f56f42c283fe49R41