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TokenBuffer.java
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1243 lines (1093 loc) · 40.1 KB
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package org.codehaus.jackson.util;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import org.codehaus.jackson.*;
import org.codehaus.jackson.impl.JsonReadContext;
import org.codehaus.jackson.impl.JsonWriteContext;
/**
* Utility class used for efficient storage of {@link JsonToken}
* sequences, needed for temporary buffering.
* Space efficient for different sequence lengths (especially so for smaller
* ones; but not significantly less efficient for larger), highly efficient
* for linear iteration and appending. Implemented as segmented/chunked
* linked list of tokens; only modifications are via appends.
*
* @since 1.5
*/
public class TokenBuffer
/* Won't use JsonGeneratorBase, to minimize overhead for validity
* checking
*/
extends JsonGenerator
{
final static int DEFAULT_FEATURES = JsonParser.Feature.collectDefaults();
/*
***********************************************
* Configuration
***********************************************
*/
/**
* Object codec to use for stream-based object
* conversion through parser/generator interfaces. If null,
* such methods can not be used.
*/
protected ObjectCodec _objectCodec;
/**
* Bit flag composed of bits that indicate which
* {@link org.codehaus.jackson.JsonGenerator.Feature}s
* are enabled.
*<p>
* NOTE: most features have no effect on this class
*/
protected int _generatorFeatures;
protected boolean _closed;
/*
***********************************************
* Token buffering state
***********************************************
*/
/**
* First segment, for contents this buffer has
*/
protected Segment _first;
/**
* Last segment of this buffer, one that is used
* for appending more tokens
*/
protected Segment _last;
/**
* Offset within last segment,
*/
protected int _appendOffset;
/*
***********************************************
* Output state
***********************************************
*/
protected JsonWriteContext _writeContext;
/*
***********************************************
* Life-cycle
***********************************************
*/
/**
* @param codec Object codec to use for stream-based object
* conversion through parser/generator interfaces. If null,
* such methods can not be used.
*/
public TokenBuffer(ObjectCodec codec)
{
_objectCodec = codec;
_generatorFeatures = DEFAULT_FEATURES;
_writeContext = JsonWriteContext.createRootContext();
// at first we have just one segment
_first = _last = new Segment();
_appendOffset = 0;
}
/**
* Method used to create a {@link JsonParser} that can read contents
* stored in this buffer. Will use default <code>_objectCodec</code> for
* object conversions.
*<p>
* Note: instances are not synchronized, that is, they are not thread-safe
* if there are concurrent appends to the underlying buffer.
*
* @return Parser that can be used for reading contents stored in this buffer
*/
public JsonParser asParser()
{
return asParser(_objectCodec);
}
/**
* Method used to create a {@link JsonParser} that can read contents
* stored in this buffer.
*<p>
* Note: instances are not synchronized, that is, they are not thread-safe
* if there are concurrent appends to the underlying buffer.
*
* @param codec Object codec to use for stream-based object
* conversion through parser/generator interfaces. If null,
* such methods can not be used.
*
* @return Parser that can be used for reading contents stored in this buffer
*/
public JsonParser asParser(ObjectCodec codec)
{
return new Parser(_first, codec);
}
/**
* @param src Parser to use for accessing source information
* like location, configured codec
* @return Undocumented.
*/
public JsonParser asParser(JsonParser src)
{
Parser p = new Parser(_first, src.getCodec());
p.setLocation(src.getTokenLocation());
return p;
}
/*
*****************************************************************
* Other custom methods not needed for implementing interfaces
*****************************************************************
*/
/**
* Helper method that will write all contents of this buffer
* using given {@link JsonGenerator}.
*<p>
* Note: this method would be enough to implement
* <code>JsonSerializer</code> for <code>TokenBuffer</code> type;
* but we can not have upwards
* references (from core to mapper package); and as such we also
* can not take second argument.
* @param jgen Undocumented.
* @throws java.io.IOException Undocumented.
* @throws org.codehaus.jackson.JsonGenerationException Undocumented.
*/
public void serialize(JsonGenerator jgen)
throws IOException, JsonGenerationException
{
Segment segment = _first;
int ptr = -1;
while (true) {
if (++ptr >= Segment.TOKENS_PER_SEGMENT) {
ptr = 0;
segment = segment.next();
if (segment == null) break;
}
JsonToken t = segment.type(ptr);
if (t == null) break;
// Note: copied from 'copyCurrentEvent'...
switch (t) {
case START_OBJECT:
jgen.writeStartObject();
break;
case END_OBJECT:
jgen.writeEndObject();
break;
case START_ARRAY:
jgen.writeStartArray();
break;
case END_ARRAY:
jgen.writeEndArray();
break;
case FIELD_NAME:
jgen.writeFieldName((String) segment.get(ptr));
break;
case VALUE_STRING:
jgen.writeString((String) segment.get(ptr));
break;
case VALUE_NUMBER_INT:
{
Number n = (Number) segment.get(ptr);
if (n instanceof BigInteger) {
jgen.writeNumber((BigInteger) n);
} else if (n instanceof Long) {
jgen.writeNumber(n.longValue());
} else {
jgen.writeNumber(n.intValue());
}
}
break;
case VALUE_NUMBER_FLOAT:
{
Number n = (Number) segment.get(ptr);
if (n instanceof BigDecimal) {
jgen.writeNumber((BigDecimal) n);
} else if (n instanceof Float) {
jgen.writeNumber(n.floatValue());
} else {
jgen.writeNumber(n.doubleValue());
}
}
break;
case VALUE_TRUE:
jgen.writeBoolean(true);
break;
case VALUE_FALSE:
jgen.writeBoolean(false);
break;
case VALUE_NULL:
jgen.writeNull();
break;
case VALUE_EMBEDDED_OBJECT:
jgen.writeObject(segment.get(ptr));
break;
default:
throw new RuntimeException("Internal error: should never end up through this code path");
}
}
}
@Override
public String toString()
{
// Let's print up to 100 first tokens...
final int MAX_COUNT = 100;
StringBuilder sb = new StringBuilder();
sb.append("[TokenBuffer: ");
JsonParser jp = asParser();
int count = 0;
while (true) {
JsonToken t;
try {
t = jp.nextToken();
} catch (IOException ioe) { // should never occur
throw new IllegalStateException(ioe);
}
if (t == null) break;
if (count < MAX_COUNT) {
if (count > 0) {
sb.append(", ");
}
sb.append(t.toString());
}
++count;
}
if (count >= MAX_COUNT) {
sb.append(" ... (truncated ").append(count-MAX_COUNT).append(" entries)");
}
sb.append(']');
return sb.toString();
}
/*
*****************************************************************
* JsonGenerator implementation: configuration
*****************************************************************
*/
@Override
public JsonGenerator enable(Feature f) {
_generatorFeatures |= f.getMask();
return this;
}
@Override
public JsonGenerator disable(Feature f) {
_generatorFeatures &= ~f.getMask();
return this;
}
//public JsonGenerator configure(Feature f, boolean state) { }
@Override
public boolean isEnabled(Feature f) {
return (_generatorFeatures & f.getMask()) != 0;
}
public JsonGenerator useDefaultPrettyPrinter() {
// No-op: we don't indent
return this;
}
public JsonGenerator setCodec(ObjectCodec oc) {
_objectCodec = oc;
return this;
}
public ObjectCodec getCodec() { return _objectCodec; }
public final JsonWriteContext getOutputContext() { return _writeContext; }
/*
*****************************************************************
* JsonGenerator implementation: low-level output handling
*****************************************************************
*/
public void flush() throws IOException { /* NOP */ }
public void close() throws IOException {
_closed = true;
}
public boolean isClosed() { return _closed; }
/*
*****************************************************************
* JsonGenerator implementation: write methods, structural
*****************************************************************
*/
@Override
public final void writeStartArray()
throws IOException, JsonGenerationException
{
_append(JsonToken.START_ARRAY);
_writeContext = _writeContext.createChildArrayContext();
}
@Override
public final void writeEndArray()
throws IOException, JsonGenerationException
{
_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
public final void writeStartObject()
throws IOException, JsonGenerationException
{
_append(JsonToken.START_OBJECT);
_writeContext = _writeContext.createChildObjectContext();
}
public final void writeEndObject()
throws IOException, JsonGenerationException
{
_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;
}
}
public final void writeFieldName(String name)
throws IOException, JsonGenerationException
{
_append(JsonToken.FIELD_NAME, name);
_writeContext.writeFieldName(name);
}
/*
*****************************************************************
* JsonGenerator implementation: write methods, textual
*****************************************************************
*/
@Override
public void writeString(String text) throws IOException,JsonGenerationException {
if (text == null) {
writeNull();
} else {
_append(JsonToken.VALUE_STRING, text);
}
}
@Override
public void writeString(char[] text, int offset, int len) throws IOException, JsonGenerationException {
writeString(new String(text, offset, len));
}
@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();
}
/*
*****************************************************************
* JsonGenerator implementation: write methods, primitive types
*****************************************************************
*/
@Override
public void writeNumber(int i) throws IOException, JsonGenerationException {
_append(JsonToken.VALUE_NUMBER_INT, Integer.valueOf(i));
}
@Override
public void writeNumber(long l) throws IOException, JsonGenerationException {
_append(JsonToken.VALUE_NUMBER_INT, Long.valueOf(l));
}
@Override
public void writeNumber(double d) throws IOException,JsonGenerationException {
_append(JsonToken.VALUE_NUMBER_FLOAT, Double.valueOf(d));
}
@Override
public void writeNumber(float f) throws IOException, JsonGenerationException {
_append(JsonToken.VALUE_NUMBER_FLOAT, Float.valueOf(f));
}
@Override
public void writeNumber(BigDecimal dec) throws IOException,JsonGenerationException {
if (dec == null) {
writeNull();
} else {
_append(JsonToken.VALUE_NUMBER_FLOAT, dec);
}
}
@Override
public void writeNumber(BigInteger v) throws IOException, JsonGenerationException {
if (v == null) {
writeNull();
} else {
_append(JsonToken.VALUE_NUMBER_INT, v);
}
}
@Override
public void writeNumber(String encodedValue) throws IOException, JsonGenerationException {
/* Hmmh... let's actually support this as regular String value write:
* should work since there is no quoting when buffering
*/
writeString(encodedValue);
}
@Override
public void writeBoolean(boolean state) throws IOException,JsonGenerationException {
_append(state ? JsonToken.VALUE_TRUE : JsonToken.VALUE_FALSE);
}
@Override
public void writeNull() throws IOException, JsonGenerationException {
_append(JsonToken.VALUE_NULL);
}
/*
*****************************************************************
* JsonGenerator implementation: write methods for POJOs/trees
*****************************************************************
*/
public void writeObject(Object value)
throws IOException, JsonProcessingException
{
// embedded means that no conversions should be done...
_append(JsonToken.VALUE_EMBEDDED_OBJECT, value);
}
public void writeTree(JsonNode rootNode)
throws IOException, JsonProcessingException
{
/* 31-Dec-2009, tatu: no need to convert trees either is there?
* (note: may need to re-evaluate at some point)
*/
_append(JsonToken.VALUE_EMBEDDED_OBJECT, rootNode);
}
/*
*****************************************************************
* JsonGenerator implementation; binary
*****************************************************************
*/
@Override
public void writeBinary(Base64Variant b64variant, byte[] data, int offset, int len)
throws IOException, JsonGenerationException
{
/* 31-Dec-2009, tatu: can do this using multiple alternatives; but for
* now, let's try to limit number of conversions.
* The only (?) tricky thing is that of whether to preserve variant,
* seems pointless, so let's not worry about it unless there's some
* compelling reason to.
*/
byte[] copy = new byte[len];
System.arraycopy(data, offset, copy, 0, len);
writeObject(copy);
}
/*
*****************************************************************
* JsonGenerator implementation; pass-through copy
*****************************************************************
*/
@Override
public void copyCurrentEvent(JsonParser jp) throws IOException, JsonProcessingException
{
switch (jp.getCurrentToken()) {
case START_OBJECT:
writeStartObject();
break;
case END_OBJECT:
writeEndObject();
break;
case START_ARRAY:
writeStartArray();
break;
case END_ARRAY:
writeEndArray();
break;
case FIELD_NAME:
writeFieldName(jp.getCurrentName());
break;
case VALUE_STRING:
writeString(jp.getTextCharacters(), jp.getTextOffset(), jp.getTextLength());
break;
case VALUE_NUMBER_INT:
switch (jp.getNumberType()) {
case INT:
writeNumber(jp.getIntValue());
break;
case BIG_INTEGER:
writeNumber(jp.getBigIntegerValue());
break;
default:
writeNumber(jp.getLongValue());
}
break;
case VALUE_NUMBER_FLOAT:
switch (jp.getNumberType()) {
case BIG_DECIMAL:
writeNumber(jp.getDecimalValue());
break;
case FLOAT:
writeNumber(jp.getFloatValue());
break;
default:
writeNumber(jp.getDoubleValue());
}
break;
case VALUE_TRUE:
writeBoolean(true);
break;
case VALUE_FALSE:
writeBoolean(false);
break;
case VALUE_NULL:
writeNull();
break;
case VALUE_EMBEDDED_OBJECT:
writeObject(jp.getEmbeddedObject());
break;
default:
throw new RuntimeException("Internal error: should never end up through this code path");
}
}
@Override
public void copyCurrentStructure(JsonParser jp) throws IOException, JsonProcessingException {
JsonToken t = jp.getCurrentToken();
// Let's handle field-name separately first
if (t == JsonToken.FIELD_NAME) {
writeFieldName(jp.getCurrentName());
t = jp.nextToken();
// fall-through to copy the associated value
}
switch (t) {
case START_ARRAY:
writeStartArray();
while (jp.nextToken() != JsonToken.END_ARRAY) {
copyCurrentStructure(jp);
}
writeEndArray();
break;
case START_OBJECT:
writeStartObject();
while (jp.nextToken() != JsonToken.END_OBJECT) {
copyCurrentStructure(jp);
}
writeEndObject();
break;
default: // others are simple:
copyCurrentEvent(jp);
}
}
/*
*****************************************************************
* Internal methods
*****************************************************************
*/
protected final void _append(JsonToken type) {
Segment next = _last.append(_appendOffset, type);
if (next == null) {
++_appendOffset;
} else {
_last = next;
_appendOffset = 1; // since we added first at 0
}
}
protected final void _append(JsonToken type, Object value) {
Segment next = _last.append(_appendOffset, type, value);
if (next == null) {
++_appendOffset;
} else {
_last = next;
_appendOffset = 1;
}
}
protected void _reportUnsupportedOperation() {
throw new UnsupportedOperationException("Called operation not supported for TokenBuffer");
}
/*
*****************************************************************
* Supporting classes
*****************************************************************
*/
protected final static class Parser
extends JsonParser
{
protected ObjectCodec _codec;
/*
////////////////////////////////////////////////////
// Parsing state
////////////////////////////////////////////////////
*/
/**
* Currently active segment
*/
protected Segment _segment;
/**
* Pointer to current token within current segment
*/
protected int _segmentPtr;
/**
* Information about parser context, context in which
* the next token is to be parsed (root, array, object).
*/
protected JsonReadContext _parsingContext;
protected boolean _closed;
protected transient ByteArrayBuilder _byteBuilder;
protected JsonLocation _location = null;
/*
////////////////////////////////////////////////////
// Construction, init
////////////////////////////////////////////////////
*/
public Parser(Segment firstSeg, ObjectCodec codec) {
_segment = firstSeg;
_segmentPtr = -1; // not yet read
_codec = codec;
_parsingContext = JsonReadContext.createRootContext(-1, -1);
}
public void setLocation(JsonLocation l) {
_location = l;
}
@Override
public ObjectCodec getCodec() { return _codec; }
@Override
public void setCodec(ObjectCodec c) { _codec = c; }
/*
////////////////////////////////////////////////////
// Closeable implementation
////////////////////////////////////////////////////
*/
@Override
public void close() throws IOException {
if (!_closed) {
_closed = true;
}
}
/*
////////////////////////////////////////////////////
// Public API, traversal
////////////////////////////////////////////////////
*/
@Override
public JsonToken nextToken() throws IOException, JsonParseException
{
// If we are closed, nothing more to do
if (_closed || (_segment == null)) return null;
// Ok, then: any more tokens?
if (++_segmentPtr >= Segment.TOKENS_PER_SEGMENT) {
_segmentPtr = 0;
_segment = _segment.next();
if (_segment == null) {
return null;
}
}
_currToken = _segment.type(_segmentPtr);
// Field name? Need to update context
if (_currToken == JsonToken.FIELD_NAME) {
_parsingContext.setCurrentName((String) _currentObject());
} else if (_currToken == JsonToken.START_OBJECT) {
_parsingContext = _parsingContext.createChildObjectContext(-1, -1);
} else if (_currToken == JsonToken.START_ARRAY) {
_parsingContext = _parsingContext.createChildArrayContext(-1, -1);
} else if (_currToken == JsonToken.END_OBJECT
|| _currToken == JsonToken.END_ARRAY) {
// Closing JSON Object/Array? Close matching context
_parsingContext = _parsingContext.getParent();
// but allow unbalanced cases too (more close markers)
if (_parsingContext == null) {
_parsingContext = JsonReadContext.createRootContext(-1, -1);
}
}
return _currToken;
}
@Override
public JsonParser skipChildren() throws IOException, JsonParseException
{
if (_currToken != JsonToken.START_OBJECT && _currToken != JsonToken.START_ARRAY) {
return this;
}
int open = 1;
/* Since proper matching of start/end markers is handled
* by nextToken(), we'll just count nesting levels here
*/
while (true) {
JsonToken t = nextToken();
if (t == null) {
// error for most parsers, but ok here
return this;
}
switch (t) {
case START_OBJECT:
case START_ARRAY:
++open;
break;
case END_OBJECT:
case END_ARRAY:
if (--open == 0) {
return this;
}
break;
}
}
}
@Override
public boolean isClosed() { return _closed; }
/*
////////////////////////////////////////////////////
// Public API, token accessors
////////////////////////////////////////////////////
*/
@Override
public JsonStreamContext getParsingContext() { return _parsingContext; }
@Override
public JsonLocation getTokenLocation() { return getCurrentLocation(); }
@Override
public JsonLocation getCurrentLocation() {
return (_location == null) ? JsonLocation.NA : _location;
}
@Override
public String getCurrentName() { return _parsingContext.getCurrentName(); }
/*
////////////////////////////////////////////////////
// Public API, access to token information, text
////////////////////////////////////////////////////
*/
@Override
public String getText()
{
if (_currToken != null) { // null only before/after document
switch (_currToken) {
case FIELD_NAME:
case VALUE_STRING:
return (String) _currentObject();
// fall through
case VALUE_NUMBER_INT:
case VALUE_NUMBER_FLOAT:
Object ob = _currentObject();
return (ob == null) ? null : ob.toString();
default:
return _currToken.asString();
}
}
return null;
}
@Override
public char[] getTextCharacters() {
String str = getText();
return (str == null) ? null : str.toCharArray();
}
@Override
public int getTextLength() {
String str = getText();
return (str == null) ? 0 : str.length();
}
@Override
public int getTextOffset() { return 0; }
/*
////////////////////////////////////////////////////
// Public API, access to token information, numeric
////////////////////////////////////////////////////
*/
@Override
public BigInteger getBigIntegerValue() throws IOException, JsonParseException
{
Number n = getNumberValue();
if (n instanceof BigInteger) {
return (BigInteger) n;
}
switch (getNumberType()) {
case BIG_DECIMAL:
return ((BigDecimal) n).toBigInteger();
}
// int/long is simple, but let's also just truncate float/double:
return BigInteger.valueOf(n.longValue());
}
@Override
public BigDecimal getDecimalValue() throws IOException, JsonParseException
{
Number n = getNumberValue();
if (n instanceof BigDecimal) {
return (BigDecimal) n;
}
switch (getNumberType()) {
case INT:
case LONG:
return BigDecimal.valueOf(n.longValue());
case BIG_INTEGER:
return new BigDecimal((BigInteger) n);
}
// float or double
return BigDecimal.valueOf(n.doubleValue());
}
@Override
public double getDoubleValue() throws IOException, JsonParseException {
return getNumberValue().doubleValue();
}
@Override
public float getFloatValue() throws IOException, JsonParseException {
return getNumberValue().floatValue();
}
@Override
public int getIntValue() throws IOException, JsonParseException {
return getNumberValue().intValue();
}
@Override
public long getLongValue() throws IOException, JsonParseException {
return getNumberValue().longValue();
}
@Override
public NumberType getNumberType() throws IOException, JsonParseException
{
Number n = getNumberValue();
if (n instanceof Integer) return NumberType.INT;
if (n instanceof Long) return NumberType.LONG;
if (n instanceof Double) return NumberType.DOUBLE;
if (n instanceof BigDecimal) return NumberType.BIG_DECIMAL;
if (n instanceof Float) return NumberType.FLOAT;
if (n instanceof BigInteger) return NumberType.BIG_INTEGER;
return null;
}
@Override
public final Number getNumberValue() throws IOException, JsonParseException {
_checkIsNumber();
return (Number) _currentObject();
}
/*
////////////////////////////////////////////////////
// Public API, access to token information, other
////////////////////////////////////////////////////
*/
private final static int INT_SPACE = 0x0020;
public Object getEmbeddedObject()
{
if (_currToken == JsonToken.VALUE_EMBEDDED_OBJECT) {
return _currentObject();
}
return null;
}
@Override
public byte[] getBinaryValue(Base64Variant b64variant) throws IOException, JsonParseException
{
// First: maybe we some special types?
if (_currToken == JsonToken.VALUE_EMBEDDED_OBJECT) {
// Embedded byte array would work nicely...
Object ob = _currentObject();
if (ob instanceof byte[]) {
return (byte[]) ob;
}
// fall through to error case
}
if (_currToken != JsonToken.VALUE_STRING) {
throw _constructError("Current token ("+_currToken+") not VALUE_STRING (or VALUE_EMBEDDED_OBJECT with byte[]), can not access as binary");
}
final String str = getText();
if (str == null) {
return null;
}
ByteArrayBuilder builder = _byteBuilder;
if (builder == null) {
_byteBuilder = builder = new ByteArrayBuilder(100);