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package com.fasterxml.jackson.dataformat.yaml;
import java.io.*;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.DumperOptions.FlowStyle;
import org.yaml.snakeyaml.emitter.Emitter;
import org.yaml.snakeyaml.events.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.base.GeneratorBase;
import com.fasterxml.jackson.core.json.JsonWriteContext;
import com.fasterxml.jackson.core.io.IOContext;
public class YAMLGenerator extends GeneratorBase
{
/**
* Enumeration that defines all togglable features for YAML generators
*/
public enum Feature {
/**
* Whether we are to write an explicit document start marker ("---")
* or not.
*
* @since 2.3
*/
WRITE_DOC_START_MARKER(true),
/**
* Do we try to force so-called canonical output or not.
*/
CANONICAL_OUTPUT(false)
;
protected final boolean _defaultState;
protected final int _mask;
/**
* Method that calculates bit set (flags) of all features that
* are enabled by default.
*/
public static int collectDefaults()
{
int flags = 0;
for (Feature f : values()) {
if (f.enabledByDefault()) {
flags |= f.getMask();
}
}
return flags;
}
private Feature(boolean defaultState) {
_defaultState = defaultState;
_mask = (1 << ordinal());
}
public boolean enabledByDefault() { return _defaultState; }
public int getMask() { return _mask; }
};
protected final static long MIN_INT_AS_LONG = (long) Integer.MIN_VALUE;
protected final static long MAX_INT_AS_LONG = (long) Integer.MAX_VALUE;
/*
/**********************************************************
/* Configuration
/**********************************************************
*/
final protected IOContext _ioContext;
/**
* Bit flag composed of bits that indicate which
* {@link YAMLGenerator.Feature}s
* are enabled.
*/
protected int _yamlFeatures;
protected Writer _writer;
protected DumperOptions _outputOptions;
// for field names, leave out quotes
private final static Character STYLE_NAME = null;
// numbers, booleans, should use implicit
private final static Character STYLE_SCALAR = null;
// Strings quoted for fun
private final static Character STYLE_STRING = Character.valueOf('"');
// Which flow style to use for Base64? Maybe basic quoted?
private final static Character STYLE_BASE64 = Character.valueOf('"');
/*
/**********************************************************
/* Output state
/**********************************************************
*/
protected Emitter _emitter;
/**
* YAML supports native Object identifiers, so databinder may indicate
* need to output one.
*/
protected String _objectId;
/**
* YAML supports native Type identifiers, so databinder may indicate
* need to output one.
*/
protected String _typeId;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public YAMLGenerator(IOContext ctxt, int jsonFeatures, int yamlFeatures,
ObjectCodec codec, Writer out,
org.yaml.snakeyaml.DumperOptions.Version version
) throws IOException
{
super(jsonFeatures, codec);
_ioContext = ctxt;
_yamlFeatures = yamlFeatures;
_writer = out;
_emitter = new Emitter(_writer, _outputOptions());
// should we start output now, or try to defer?
_emitter.emit(new StreamStartEvent(null, null));
Map noTags = Collections.emptyMap();
boolean startMarker = (Feature.WRITE_DOC_START_MARKER.getMask() & yamlFeatures) != 0;
_emitter.emit(new DocumentStartEvent(null, null, startMarker,
version, // for 1.10 was: ((version == null) ? null : version.getArray()),
noTags));
}
/*
/**********************************************************
/* Versioned
/**********************************************************
*/
@Override
public Version version() {
return PackageVersion.VERSION;
}
/*
/**********************************************************
/* Overridden methods, configuration
/**********************************************************
*/
/**
* Not sure what to do here; could reset indentation to some value maybe?
*/
@Override
public YAMLGenerator useDefaultPrettyPrinter()
{
return this;
}
/**
* Not sure what to do here; will always indent, but uses
* YAML-specific settings etc.
*/
@Override
public YAMLGenerator setPrettyPrinter(PrettyPrinter pp) {
return this;
}
@Override
public Object getOutputTarget() {
return _writer;
}
@Override
public boolean canUseSchema(FormatSchema schema) {
return false;
}
//@Override public void setSchema(FormatSchema schema)
/*
/**********************************************************************
/* Overridden methods; writing field names
/**********************************************************************
*/
/* And then methods overridden to make final, streamline some
* aspects...
*/
@Override
public final void writeFieldName(String name) throws IOException, JsonGenerationException
{
if (_writeContext.writeFieldName(name) == JsonWriteContext.STATUS_EXPECT_VALUE) {
_reportError("Can not write a field name, expecting a value");
}
_writeFieldName(name);
}
@Override
public final void writeFieldName(SerializableString name)
throws IOException, JsonGenerationException
{
// Object is a value, need to verify it's allowed
if (_writeContext.writeFieldName(name.getValue()) == JsonWriteContext.STATUS_EXPECT_VALUE) {
_reportError("Can not write a field name, expecting a value");
}
_writeFieldName(name.getValue());
}
@Override
public final void writeStringField(String fieldName, String value)
throws IOException, JsonGenerationException
{
if (_writeContext.writeFieldName(fieldName) == JsonWriteContext.STATUS_EXPECT_VALUE) {
_reportError("Can not write a field name, expecting a value");
}
_writeFieldName(fieldName);
writeString(value);
}
private final void _writeFieldName(String name)
throws IOException, JsonGenerationException
{
_writeScalar(name, "string", STYLE_NAME);
}
/*
/**********************************************************
/* Extended API, configuration
/**********************************************************
*/
public YAMLGenerator enable(Feature f) {
_yamlFeatures |= f.getMask();
return this;
}
public YAMLGenerator disable(Feature f) {
_yamlFeatures &= ~f.getMask();
return this;
}
public final boolean isEnabled(Feature f) {
return (_yamlFeatures & f.getMask()) != 0;
}
public YAMLGenerator configure(Feature f, boolean state) {
if (state) {
enable(f);
} else {
disable(f);
}
return this;
}
/*
/**********************************************************
/* Public API: low-level I/O
/**********************************************************
*/
@Override
public final void flush() throws IOException
{
_writer.flush();
}
@Override
public void close() throws IOException
{
_emitter.emit(new DocumentEndEvent(null, null, false));
_emitter.emit(new StreamEndEvent(null, null));
super.close();
_writer.close();
}
/*
/**********************************************************
/* Public API: structural output
/**********************************************************
*/
@Override
public final void writeStartArray() throws IOException, JsonGenerationException
{
_verifyValueWrite("start an array");
_writeContext = _writeContext.createChildArrayContext();
Boolean style = _outputOptions().getDefaultFlowStyle().getStyleBoolean();
String yamlTag = _typeId;
boolean implicit = (yamlTag == null);
String anchor = _objectId;
if (anchor != null) {
_objectId = null;
}
_emitter.emit(new SequenceStartEvent(anchor, yamlTag,
implicit, null, null, style));
}
@Override
public final void writeEndArray() throws IOException, JsonGenerationException
{
if (!_writeContext.inArray()) {
_reportError("Current context not an ARRAY but "+_writeContext.getTypeDesc());
}
// just to make sure we don't "leak" type ids
_typeId = null;
_writeContext = _writeContext.getParent();
_emitter.emit(new SequenceEndEvent(null, null));
}
@Override
public final void writeStartObject() throws IOException, JsonGenerationException
{
_verifyValueWrite("start an object");
_writeContext = _writeContext.createChildObjectContext();
Boolean style = _outputOptions().getDefaultFlowStyle().getStyleBoolean();
String yamlTag = _typeId;
boolean implicit = (yamlTag == null);
String anchor = _objectId;
if (anchor != null) {
_objectId = null;
}
_emitter.emit(new MappingStartEvent(anchor, yamlTag,
implicit, null, null, style));
}
@Override
public final void writeEndObject() throws IOException, JsonGenerationException
{
if (!_writeContext.inObject()) {
_reportError("Current context not an object but "+_writeContext.getTypeDesc());
}
// just to make sure we don't "leak" type ids
_typeId = null;
_writeContext = _writeContext.getParent();
_emitter.emit(new MappingEndEvent(null, null));
}
/*
/**********************************************************
/* Output method implementations, textual
/**********************************************************
*/
@Override
public void writeString(String text) throws IOException,JsonGenerationException
{
if (text == null) {
writeNull();
return;
}
_verifyValueWrite("write String value");
_writeScalar(text, "string", STYLE_STRING);
}
@Override
public void writeString(char[] text, int offset, int len) throws IOException, JsonGenerationException
{
writeString(new String(text, offset, len));
}
@Override
public final void writeString(SerializableString sstr)
throws IOException, JsonGenerationException
{
writeString(sstr.toString());
}
@Override
public void writeRawUTF8String(byte[] text, int offset, int len)
throws IOException, JsonGenerationException
{
_reportUnsupportedOperation();
}
@Override
public final void writeUTF8String(byte[] text, int offset, int len)
throws IOException, JsonGenerationException
{
writeString(new String(text, offset, len, "UTF-8"));
}
/*
/**********************************************************
/* Output method implementations, unprocessed ("raw")
/**********************************************************
*/
@Override
public void writeRaw(String text) throws IOException, JsonGenerationException {
_reportUnsupportedOperation();
}
@Override
public void writeRaw(String text, int offset, int len) throws IOException, JsonGenerationException {
_reportUnsupportedOperation();
}
@Override
public void writeRaw(char[] text, int offset, int len) throws IOException, JsonGenerationException {
_reportUnsupportedOperation();
}
@Override
public void writeRaw(char c) throws IOException, JsonGenerationException {
_reportUnsupportedOperation();
}
@Override
public void writeRawValue(String text) throws IOException, JsonGenerationException {
_reportUnsupportedOperation();
}
@Override
public void writeRawValue(String text, int offset, int len) throws IOException, JsonGenerationException {
_reportUnsupportedOperation();
}
@Override
public void writeRawValue(char[] text, int offset, int len) throws IOException, JsonGenerationException {
_reportUnsupportedOperation();
}
/*
/**********************************************************
/* Output method implementations, base64-encoded binary
/**********************************************************
*/
@Override
public void writeBinary(Base64Variant b64variant, byte[] data, int offset, int len) throws IOException, JsonGenerationException
{
if (data == null) {
writeNull();
return;
}
_verifyValueWrite("write Binary value");
// ok, better just Base64 encode as a String...
if (offset > 0 || (offset+len) != data.length) {
data = Arrays.copyOfRange(data, offset, offset+len);
}
String encoded = b64variant.encode(data);
_writeScalar(encoded, "byte[]", STYLE_BASE64);
}
/*
/**********************************************************
/* Output method implementations, primitive
/**********************************************************
*/
@Override
public void writeBoolean(boolean state) throws IOException, JsonGenerationException
{
_verifyValueWrite("write boolean value");
_writeScalar(state ? "true" : "false", "bool", STYLE_SCALAR);
}
@Override
public void writeNumber(int i) throws IOException, JsonGenerationException
{
_verifyValueWrite("write number");
_writeScalar(String.valueOf(i), "int", STYLE_SCALAR);
}
@Override
public void writeNumber(long l) throws IOException, JsonGenerationException
{
// First: maybe 32 bits is enough?
if (l <= MAX_INT_AS_LONG && l >= MIN_INT_AS_LONG) {
writeNumber((int) l);
return;
}
_verifyValueWrite("write number");
_writeScalar(String.valueOf(l), "long", STYLE_SCALAR);
}
@Override
public void writeNumber(BigInteger v) throws IOException, JsonGenerationException
{
if (v == null) {
writeNull();
return;
}
_verifyValueWrite("write number");
_writeScalar(String.valueOf(v.toString()), "java.math.BigInteger", STYLE_SCALAR);
}
@Override
public void writeNumber(double d) throws IOException, JsonGenerationException
{
_verifyValueWrite("write number");
_writeScalar(String.valueOf(d), "double", STYLE_SCALAR);
}
@Override
public void writeNumber(float f) throws IOException, JsonGenerationException
{
_verifyValueWrite("write number");
_writeScalar(String.valueOf(f), "float", STYLE_SCALAR);
}
@Override
public void writeNumber(BigDecimal dec) throws IOException, JsonGenerationException
{
if (dec == null) {
writeNull();
return;
}
_verifyValueWrite("write number");
String str = isEnabled(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN) ? dec.toPlainString() : dec.toString();
_writeScalar(str, "java.math.BigDecimal", STYLE_SCALAR);
}
@Override
public void writeNumber(String encodedValue) throws IOException,JsonGenerationException, UnsupportedOperationException
{
if (encodedValue == null) {
writeNull();
return;
}
_verifyValueWrite("write number");
_writeScalar(encodedValue, "number", STYLE_SCALAR);
}
@Override
public void writeNull() throws IOException, JsonGenerationException
{
_verifyValueWrite("write null value");
// no real type for this, is there?
_writeScalar("null", "object", STYLE_SCALAR);
}
/*
/**********************************************************
/* Public API, write methods, Native Ids
/**********************************************************
*/
@Override
public boolean canWriteObjectId() {
// yes, YAML does support Native Type Ids!
return true;
}
@Override
public boolean canWriteTypeId() {
// yes, YAML does support Native Type Ids!
return true;
}
@Override
public void writeTypeId(Object id)
throws IOException, JsonGenerationException
{
// should we verify there's no preceding type id?
_typeId = String.valueOf(id);
}
@Override
public void writeObjectRef(Object id)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write Object reference");
AliasEvent evt = new AliasEvent(String.valueOf(id), null, null);
_emitter.emit(evt);
}
@Override
public void writeObjectId(Object id)
throws IOException, JsonGenerationException
{
// should we verify there's no preceding id?
_objectId = String.valueOf(id);
}
/*
/**********************************************************
/* Implementations for methods from base class
/**********************************************************
*/
@Override
protected final 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
protected void _releaseBuffers() {
// nothing special to do...
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
// Implicit means that (type) tags won't be shown, right?
private final static ImplicitTuple DEFAULT_IMPLICIT = new ImplicitTuple(true, true);
protected void _writeScalar(String value, String type, Character style) throws IOException
{
_emitter.emit(_scalarEvent(value, style));
}
protected ScalarEvent _scalarEvent(String value, Character style)
{
String yamlTag = _typeId;
if (yamlTag != null) {
_typeId = null;
}
String anchor = _objectId;
if (anchor != null) {
_objectId = null;
}
return new ScalarEvent(anchor, yamlTag, DEFAULT_IMPLICIT, value,
null, null, style);
}
protected DumperOptions _outputOptions()
{
if (_outputOptions == null) {
DumperOptions opt = new DumperOptions();
// would we want canonical?
if (isEnabled(Feature.CANONICAL_OUTPUT)) {
opt.setCanonical(true);
} else {
opt.setCanonical(false);
// if not, MUST specify flow styles
opt.setDefaultFlowStyle(FlowStyle.BLOCK);
}
_outputOptions = opt;
}
return _outputOptions;
}
}