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/TextNode.java

    package com.fasterxml.jackson.databind.node;
    
    import java.io.IOException;
    
    import com.fasterxml.jackson.core.*;
    import com.fasterxml.jackson.core.io.CharTypes;
    import com.fasterxml.jackson.core.io.NumberInput;
    import com.fasterxml.jackson.core.util.ByteArrayBuilder;
    
    import com.fasterxml.jackson.databind.SerializerProvider;
    import com.fasterxml.jackson.databind.exc.InvalidFormatException;
    
    /**
     * Value node that contains a text value.
     */
    public class TextNode
        extends ValueNode
    {
        private static final long serialVersionUID = 2L;
    
        final static TextNode EMPTY_STRING_NODE = new TextNode("");
    
        protected final String _value;
    
        public TextNode(String v) { _value = v; }
    
        /**
         * Factory method that should be used to construct instances.
         * For some common cases, can reuse canonical instances: currently
         * this is the case for empty Strings, in future possible for
         * others as well. If null is passed, will return null.
         *
         * @return Resulting {@link TextNode} object, if <b>v</b>
         *   is NOT null; null if it is.
         */
        public static TextNode valueOf(String v)
        {
            if (v == null) {
                return null;
            }
            if (v.isEmpty()) {
                return EMPTY_STRING_NODE;
            }
            return new TextNode(v);
        }
    
        @Override
        public JsonNodeType getNodeType() {
            return JsonNodeType.STRING;
        }
    
        @Override public JsonToken asToken() { return JsonToken.VALUE_STRING; }
    
        @Override
        public String textValue() {
            return _value;
        }
    
        /**
         * Method for accessing textual contents assuming they were
         * base64 encoded; if so, they are decoded and resulting binary
         * data is returned.
         */
        @SuppressWarnings("resource")
        public byte[] getBinaryValue(Base64Variant b64variant) throws IOException
        {
            final String str = _value.trim();
            // 04-Sep-2020, tatu: Let's limit the size of the initial block to 64k,
            //    no point in trying to exactly match the size beyond certain point
            // (plus it could even lead to unnecessarily high retention with block
            // recycling)
            final int initBlockSize = 4 + ((str.length() >> 2) * 3);
            ByteArrayBuilder builder = new ByteArrayBuilder(Math.max(16,
                    Math.min(0x10000, initBlockSize)));
            try {
                b64variant.decode(str, builder);
            } catch (IllegalArgumentException e) {
                throw InvalidFormatException.from(null,
                        String.format(
    "Cannot access contents of TextNode as binary due to broken Base64 encoding: %s",
    e.getMessage()),
                        str, byte[].class);
            }
            return builder.toByteArray();
        }
    
        @Override
        public byte[] binaryValue() throws IOException {
            return getBinaryValue(Base64Variants.getDefaultVariant());
        }
    
        /* 
        /**********************************************************
        /* General type coercions
        /**********************************************************
         */
    
        @Override
        public String asText() {
            return _value;
        }
    
        @Override
        public String asText(String defaultValue) {
            return (_value == null) ? defaultValue : _value;
        }
        
        // note: neither fast nor elegant, but these work for now:
    
        @Override
        public boolean asBoolean(boolean defaultValue) {
            if (_value != null) {
                String v = _value.trim();
                if ("true".equals(v)) {
                    return true;
                }
                if ("false".equals(v)) {
                    return false;
                }
            }
            return defaultValue;
        }
        
        @Override
        public int asInt(int defaultValue) {
            return NumberInput.parseAsInt(_value, defaultValue);
        }
    
        @Override
        public long asLong(long defaultValue) {
            return NumberInput.parseAsLong(_value, defaultValue);
        }
        
        @Override
        public double asDouble(double defaultValue) {
            return NumberInput.parseAsDouble(_value, defaultValue);
        }
        
        /* 
        /**********************************************************
        /* Serialization
        /**********************************************************
         */
        
        @Override
        public final void serialize(JsonGenerator g, SerializerProvider provider) throws IOException
        {
            if (_value == null) {
                g.writeNull();
            } else {
                g.writeString(_value);
            }
        }
    
        /*
        /**********************************************************
        /* Overridden standard methods
        /**********************************************************
         */
        
        @Override
        public boolean equals(Object o)
        {
            if (o == this) return true;
            if (o == null) return false;
            if (o instanceof TextNode) {
                return ((TextNode) o)._value.equals(_value);
            }
            return false;
        }
        
        @Override
        public int hashCode() { return _value.hashCode(); }
    
        @Deprecated // since 2.10
        protected static void appendQuoted(StringBuilder sb, String content)
        {
            sb.append('"');
            CharTypes.appendQuoted(sb, content);
            sb.append('"');
        }
    }
    

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

     

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