Jackson Data Binding Source Code

Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

  • Jackson Data Binding module allows you to converts JSON to and from POJO (Plain Old Java Object) using property accessor or using annotations.
  • Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.12.4-sources.jar). You can download it at Jackson Maven Website.

    You can also browse Jackson Databind Source Code below:

    ✍: FYIcenter.com

    com/fasterxml/jackson/databind/node/DecimalNode.java

    package com.fasterxml.jackson.databind.node;
    
    import java.io.IOException;
    import java.math.BigDecimal;
    import java.math.BigInteger;
    
    import com.fasterxml.jackson.core.*;
    import com.fasterxml.jackson.databind.*;
    
    /**
     * Numeric node that contains values that do not fit in simple
     * integer (int, long) or floating point (double) values.
     */
    @SuppressWarnings("serial")
    public class DecimalNode
        extends NumericNode
    {
        public static final DecimalNode ZERO = new DecimalNode(BigDecimal.ZERO);
    
        private final static BigDecimal MIN_INTEGER = BigDecimal.valueOf(Integer.MIN_VALUE);
        private final static BigDecimal MAX_INTEGER = BigDecimal.valueOf(Integer.MAX_VALUE);
        private final static BigDecimal MIN_LONG = BigDecimal.valueOf(Long.MIN_VALUE);
        private final static BigDecimal MAX_LONG = BigDecimal.valueOf(Long.MAX_VALUE);
    
        final protected BigDecimal _value;
    
        /* 
        /**********************************************************
        /* Construction
        /**********************************************************
         */
    
        public DecimalNode(BigDecimal v) { _value = v; }
    
        public static DecimalNode valueOf(BigDecimal d) { return new DecimalNode(d); }
    
        /* 
        /**********************************************************
        /* BaseJsonNode extended API
        /**********************************************************
         */
    
        @Override public JsonToken asToken() { return JsonToken.VALUE_NUMBER_FLOAT; }
    
        @Override
        public JsonParser.NumberType numberType() { return JsonParser.NumberType.BIG_DECIMAL; }
    
        /* 
        /**********************************************************
        /* Overrridden JsonNode methods
        /**********************************************************
         */
    
        @Override
        public boolean isFloatingPointNumber() { return true; }
        
        @Override
        public boolean isBigDecimal() { return true; }
    
        @Override public boolean canConvertToInt() {
            return (_value.compareTo(MIN_INTEGER) >= 0) && (_value.compareTo(MAX_INTEGER) <= 0);
        }
        @Override public boolean canConvertToLong() {
            return (_value.compareTo(MIN_LONG) >= 0) && (_value.compareTo(MAX_LONG) <= 0);
        }
        
        @Override // since 2.12
        public boolean canConvertToExactIntegral() {
            return (_value.signum() == 0)
                    || (_value.scale() <= 0)
                    || (_value.stripTrailingZeros().scale() <= 0);
        }
    
        @Override
        public Number numberValue() { return _value; }
    
        @Override
        public short shortValue() { return _value.shortValue(); }
    
        @Override
        public int intValue() { return _value.intValue(); }
    
        @Override
        public long longValue() { return _value.longValue(); }
    
    
        @Override
        public BigInteger bigIntegerValue() { return _value.toBigInteger(); }
    
        @Override
        public float floatValue() { return _value.floatValue(); }
        
        @Override
        public double doubleValue() { return _value.doubleValue(); }
    
        @Override
        public BigDecimal decimalValue() { return _value; }
    
        @Override
        public String asText() {
            return _value.toString();
        }
    
        @Override
        public final void serialize(JsonGenerator jgen, SerializerProvider provider)
            throws IOException, JsonProcessingException
        {
            // 07-Jul-2013, tatu: Should be handled by propagating setting to JsonGenerator
            //    so this should not be needed:
            /*
            if (provider.isEnabled(SerializationFeature.WRITE_BIGDECIMAL_AS_PLAIN)) {
                if (!(jgen instanceof TokenBuffer)) { // [Issue#232]
                    jgen.writeNumber(((BigDecimal) _value).toPlainString());
                    return;
                }
            }
            */
            jgen.writeNumber(_value);
        }
    
        @Override
        public boolean equals(Object o)
        {
            if (o == this) return true;
            if (o == null) return false;
            if (o instanceof DecimalNode) {
                return ((DecimalNode) o)._value.compareTo(_value) == 0;
            }
            return false;
        }
    
        @Override
        public int hashCode() { return Double.valueOf(doubleValue()).hashCode(); }
    }
    

    com/fasterxml/jackson/databind/node/DecimalNode.java

     

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    2022-03-29, 31933👍, 0💬