com.fasterxml.jackson.core.json.JsonWriteContext Java Examples

/**
 * @since 2.7
 */
public TokenBuffer(JsonParser p, DeserializationContext ctxt)
{
    _objectCodec = p.getCodec();
    _parentContext = p.getParsingContext();
    _generatorFeatures = DEFAULT_GENERATOR_FEATURES;
    _writeContext = JsonWriteContext.createRootContext(null);
    // at first we have just one segment
    _first = _last = new Segment();
    _appendAt = 0;
    _hasNativeTypeIds = p.canReadTypeId();
    _hasNativeObjectIds = p.canReadObjectId();
    _mayHaveNativeIds = _hasNativeTypeIds | _hasNativeObjectIds;
    _forceBigDecimal = (ctxt == null) ? false
            : ctxt.isEnabled(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS);
}
 

/**
 * @param codec Object codec to use for stream-based object
 *   conversion through parser/generator interfaces. If null,
 *   such methods cannot be used.
 * @param hasNativeIds Whether resulting {@link JsonParser} (if created)
 *   is considered to support native type and object ids
 */
public TokenBuffer(ObjectCodec codec, boolean hasNativeIds)
{
    _objectCodec = codec;
    _generatorFeatures = DEFAULT_GENERATOR_FEATURES;
    _writeContext = JsonWriteContext.createRootContext(null);
    // at first we have just one segment
    _first = _last = new Segment();
    _appendAt = 0;
    _hasNativeTypeIds = hasNativeIds;
    _hasNativeObjectIds = hasNativeIds;

    _mayHaveNativeIds = _hasNativeTypeIds | _hasNativeObjectIds;
}
 

@Override
public final void writeEndArray() throws IOException
{
    _append(JsonToken.END_ARRAY);
    // Let's allow unbalanced tho... i.e. not run out of root level, ever
    JsonWriteContext c = _writeContext.getParent();
    if (c != null) {
        _writeContext = c;
    }
}
 

@Override // since 2.8
public void writeStartObject(Object forValue) throws IOException
{
    _writeContext.writeValue();
    _append(JsonToken.START_OBJECT);
    JsonWriteContext ctxt = _writeContext.createChildObjectContext();
    _writeContext = ctxt;
    if (forValue != null) {
        ctxt.setCurrentValue(forValue);
    }
}
 

@Override
public final void writeEndObject() throws IOException
{
    _append(JsonToken.END_OBJECT);
    // Let's allow unbalanced tho... i.e. not run out of root level, ever
    JsonWriteContext c = _writeContext.getParent();
    if (c != null) {
        _writeContext = c;
    }
}
 

protected GeneratorBase(int features, ObjectCodec codec) {
    super();
    _features = features;
    _objectCodec = codec;
    DupDetector dups = Feature.STRICT_DUPLICATE_DETECTION.enabledIn(features)
            ? DupDetector.rootDetector(this) : null;
    _writeContext = JsonWriteContext.createRootContext(dups);
    _cfgNumbersAsStrings = Feature.WRITE_NUMBERS_AS_STRINGS.enabledIn(features);
}
 

/**
 * @since 2.5
 */
protected GeneratorBase(int features, ObjectCodec codec, JsonWriteContext ctxt) {
    super();
    _features = features;
    _objectCodec = codec;
    _writeContext = ctxt;
    _cfgNumbersAsStrings = Feature.WRITE_NUMBERS_AS_STRINGS.enabledIn(features);
}
 

@Override
public void serialize(String str, JsonGenerator gen,
                      SerializerProvider provider) throws IOException {
    int status = ((JsonWriteContext) gen.getOutputContext()).writeValue();
    switch (status) {
        case JsonWriteContext.STATUS_OK_AFTER_COLON:
            gen.writeRaw(':');
            break;
        case JsonWriteContext.STATUS_OK_AFTER_COMMA:
            gen.writeRaw(',');
            break;
        case JsonWriteContext.STATUS_EXPECT_NAME:
            throw new IOException("Can not write string value here");
    }
    gen.writeRaw('"');//写入JSON中字符串的开头引号
    for (char c : str.toCharArray()) {
        if (c >= 0x80) {
            writeUnicodeEscape(gen, c); // 为所有非ASCII字符生成转义的unicode字符
        } else {
            // 为ASCII字符中前128个字符使用转义的unicode字符
            int code = (c < ESCAPE_CODES.length ? ESCAPE_CODES[c] : 0);
            if (code == 0) {
                gen.writeRaw(c); // 此处不用转义
            } else if (code < 0) {
                writeUnicodeEscape(gen, (char) (-code - 1)); // 通用转义字符
            } else {
                writeShortEscape(gen, (char) code); // 短转义字符 (\n \t ...)
            }
        }
    }
    gen.writeRaw('"');//写入JSON中字符串的结束引号
}
 

protected GeneratorBase(int features, ObjectCodec codec) {
    super();
    _features = features;
    _objectCodec = codec;
    DupDetector dups = Feature.STRICT_DUPLICATE_DETECTION.enabledIn(features)
            ? DupDetector.rootDetector(this) : null;
    _writeContext = JsonWriteContext.createRootContext(dups);
    _cfgNumbersAsStrings = Feature.WRITE_NUMBERS_AS_STRINGS.enabledIn(features);
}
 

/**
 * @since 2.5
 */
protected GeneratorBase(int features, ObjectCodec codec, JsonWriteContext ctxt) {
    super();
    _features = features;
    _objectCodec = codec;
    _writeContext = ctxt;
    _cfgNumbersAsStrings = Feature.WRITE_NUMBERS_AS_STRINGS.enabledIn(features);
}
 

@Override
protected void _verifyValueWrite(String typeMsg) throws IOException, JsonGenerationException {
    int status = _writeContext.writeValue();
    if (status == JsonWriteContext.STATUS_EXPECT_NAME) {
        _reportError("Can not "+typeMsg+", expecting field name");
    }
}
 

@Override
public final JsonWriteContext getOutputContext() { return _writeContext; }
 

/**
 * Note: co-variant return type.
 */
@Override public final JsonWriteContext getOutputContext() { return _writeContext; }