Use jackson for json

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http://examples.javacodegeeks.com/core-java/json/jackson/convert-java-object-to-from-json-using-jackson-example/

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This needs prioritizing, b4 people start to use the lib

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21 #34

Can use Jackson, along with it's support for the builder pattern, stream -> object mapping, to create Transaction/LedgerEntry subclasses with plain old fields, rather using Field enum as keys into a TreeMap. Make as many SerializedType implementors immutable.

// on the Amount class ....
@JsonDeserialize(builder = Amount.Builder.class)
public class Amount extends Number implements SerializedType, Comparable<Amount>
{
...
    @JsonPOJOBuilder()
    public static class Builder {
        public AccountID issuer;
        public BigDecimal value;
        public Currency currency;

        public Builder(String value) {
            Amount amount = fromString(value);
            issuer = amount.issuer;
            this.value = amount.value;
            currency = amount.currency;
        }
        public Builder() {}
        public Amount build() {
            return new Amount(value, currency, issuer, currency.isNative());
        }
    }

// In client code
        Amount amount = mapper.readValue(
                "{\"value\" : \"11234.0005\", " +
                "\"issuer\" : \"rKyGunStozzRBNnnrMXqCZ3wVbgXgCGxji\", " +
                "\"currency\" : \"USD\"}", Amount.class);

Will need to investigate the use of jackson reflection infrastructure for serializing objects to bytes also. Can then just create clases like this:

public class OfferCreate extends Transaction {
    public UInt32 Expiration;
    public Amount TakerPays;
    ...
}

[FlorisSteenkamp]

This is my first GitHub comment ever and currently starting to learn the Git stuff, so sorry if I do noob stuff. Yes, I agree Jackson or Gson are the only 2 good options. I have forked this project and will see if I can start implementing Jackson.