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General data-binding functionality for Jackson: works on core streaming API
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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
{
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 v
* is NOT null; null if it is.
*/
public static TextNode valueOf(String v)
{
if (v == null) {
return null;
}
if (v.length() == 0) {
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();
ByteArrayBuilder builder = new ByteArrayBuilder(4 + ((str.length() * 3) << 2));
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(); }
/**
* Different from other values, Strings need quoting
*/
@Override
public String toString()
{
int len = _value.length();
len = len + 2 + (len >> 4);
StringBuilder sb = new StringBuilder(len);
appendQuoted(sb, _value);
return sb.toString();
}
protected static void appendQuoted(StringBuilder sb, String content)
{
sb.append('"');
CharTypes.appendQuoted(sb, content);
sb.append('"');
}
}
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