Support Serializer for Enum

[tangcent]

• Let’s define the following Enum:

    public enum Distance {

        KILOMETER("km", 1000),

        MILE("miles", 1609.34),

        METER("meters", 1),

        INCH("inches", 0.0254),

        CENTIMETER("cm", 0.01),

        MILLIMETER("mm", 0.001);
        private String unit;
        private final double meters;

        private Distance(String unit, double meters) {
            this.unit = unit;
            this.meters = meters;
        }

        public String getUnit() {
            return unit;
        }

        public double getMeters() {
            return meters;
        }
    }

• 1.Default Enum Representation
  By default, EasyApi will represent Java Enums as simple String – for example:

private Distance distance;

Will be equivalent to

    /**
     * @see Distance
     */
    private String distance;

• 2.Support Custom Rules
• 2.1.Convert Enum as special field - for example:

json.rule.enum.convert[your enum class]=your enum class#value field

abbreviated:

json.rule.enum.convert[your enum class]=#value field

• 2.2.Convert Enum as special method(always getter) - for example:

json.rule.enum.convert[your enum class]=your enum class#method

abbreviated:

json.rule.enum.convert[your enum class]=~#method

• 2.3.Support use script as filter - for example:

json.rule.enum.convert[groovy:it.extend("com.itangcent.Describable")]=~#desc

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see jackson-serialize-enums

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[tangcent]

support by #138