com.jsoniter.JsonIterator Maven / Gradle / Ivy
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jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go
package com.jsoniter;
import com.jsoniter.any.Any;
import com.jsoniter.spi.*;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class JsonIterator implements Closeable {
public Config configCache;
private static boolean isStreamingEnabled = false;
final static ValueType[] valueTypes = new ValueType[256];
InputStream in;
byte[] buf;
int head;
int tail;
int skipStartedAt = -1; // skip should keep bytes starting at this pos
Map tempObjects = null; // used in reflection object decoder
final Slice reusableSlice = new Slice(null, 0, 0);
char[] reusableChars = new char[32];
Object existingObject = null; // the object should be bind to next
static {
for (int i = 0; i < valueTypes.length; i++) {
valueTypes[i] = ValueType.INVALID;
}
valueTypes['"'] = ValueType.STRING;
valueTypes['-'] = ValueType.NUMBER;
valueTypes['0'] = ValueType.NUMBER;
valueTypes['1'] = ValueType.NUMBER;
valueTypes['2'] = ValueType.NUMBER;
valueTypes['3'] = ValueType.NUMBER;
valueTypes['4'] = ValueType.NUMBER;
valueTypes['5'] = ValueType.NUMBER;
valueTypes['6'] = ValueType.NUMBER;
valueTypes['7'] = ValueType.NUMBER;
valueTypes['8'] = ValueType.NUMBER;
valueTypes['9'] = ValueType.NUMBER;
valueTypes['t'] = ValueType.BOOLEAN;
valueTypes['f'] = ValueType.BOOLEAN;
valueTypes['n'] = ValueType.NULL;
valueTypes['['] = ValueType.ARRAY;
valueTypes['{'] = ValueType.OBJECT;
}
private JsonIterator(InputStream in, byte[] buf, int head, int tail) {
this.in = in;
this.buf = buf;
this.head = head;
this.tail = tail;
}
public JsonIterator() {
this(null, new byte[0], 0, 0);
}
public static JsonIterator parse(InputStream in, int bufSize) {
enableStreamingSupport();
return new JsonIterator(in, new byte[bufSize], 0, 0);
}
public static JsonIterator parse(byte[] buf) {
return new JsonIterator(null, buf, 0, buf.length);
}
public static JsonIterator parse(byte[] buf, int head, int tail) {
return new JsonIterator(null, buf, head, tail);
}
public static JsonIterator parse(String str) {
return parse(str.getBytes());
}
public static JsonIterator parse(Slice slice) {
return new JsonIterator(null, slice.data(), slice.head(), slice.tail());
}
public final void reset(byte[] buf) {
this.buf = buf;
this.head = 0;
this.tail = buf.length;
}
public final void reset(byte[] buf, int head, int tail) {
this.buf = buf;
this.head = head;
this.tail = tail;
}
public final void reset(Slice value) {
this.buf = value.data();
this.head = value.head();
this.tail = value.tail();
}
public final void reset(InputStream in) {
JsonIterator.enableStreamingSupport();
this.in = in;
this.head = 0;
this.tail = 0;
}
public final void close() throws IOException {
if (in != null) {
in.close();
}
}
final void unreadByte() {
if (head == 0) {
throw reportError("unreadByte", "unread too many bytes");
}
head--;
}
public final JsonException reportError(String op, String msg) {
int peekStart = head - 10;
if (peekStart < 0) {
peekStart = 0;
}
int peekSize = head - peekStart;
if (head > tail) {
peekSize = tail - peekStart;
}
String peek = new String(buf, peekStart, peekSize);
throw new JsonException(op + ": " + msg + ", head: " + head + ", peek: " + peek + ", buf: " + new String(buf));
}
public final String currentBuffer() {
int peekStart = head - 10;
if (peekStart < 0) {
peekStart = 0;
}
String peek = new String(buf, peekStart, head - peekStart);
return "head: " + head + ", peek: " + peek + ", buf: " + new String(buf);
}
public final boolean readNull() throws IOException {
byte c = IterImpl.nextToken(this);
if (c != 'n') {
unreadByte();
return false;
}
IterImpl.skipFixedBytes(this, 3); // null
return true;
}
public final boolean readBoolean() throws IOException {
byte c = IterImpl.nextToken(this);
if ('t' == c) {
IterImpl.skipFixedBytes(this, 3); // true
return true;
}
if ('f' == c) {
IterImpl.skipFixedBytes(this, 4); // false
return false;
}
throw reportError("readBoolean", "expect t or f, found: " + c);
}
public final short readShort() throws IOException {
int v = readInt();
if (Short.MIN_VALUE <= v && v <= Short.MAX_VALUE) {
return (short) v;
} else {
throw reportError("readShort", "short overflow: " + v);
}
}
public final int readInt() throws IOException {
return IterImplNumber.readInt(this);
}
public final long readLong() throws IOException {
return IterImplNumber.readLong(this);
}
public final boolean readArray() throws IOException {
return IterImplArray.readArray(this);
}
public String readNumberAsString() throws IOException {
return IterImplForStreaming.readNumber(this);
}
public static interface ReadArrayCallback {
boolean handle(JsonIterator iter, Object attachment) throws IOException;
}
public final boolean readArrayCB(ReadArrayCallback callback, Object attachment) throws IOException {
return IterImplArray.readArrayCB(this, callback, attachment);
}
public final String readString() throws IOException {
return IterImplString.readString(this);
}
public final Slice readStringAsSlice() throws IOException {
return IterImpl.readSlice(this);
}
public final String readObject() throws IOException {
return IterImplObject.readObject(this);
}
public static interface ReadObjectCallback {
boolean handle(JsonIterator iter, String field, Object attachment) throws IOException;
}
public final void readObjectCB(ReadObjectCallback cb, Object attachment) throws IOException {
IterImplObject.readObjectCB(this, cb, attachment);
}
public final float readFloat() throws IOException {
return IterImplNumber.readFloat(this);
}
public final double readDouble() throws IOException {
return IterImplNumber.readDouble(this);
}
public final BigDecimal readBigDecimal() throws IOException {
// skip whitespace by read next
ValueType valueType = whatIsNext();
if (valueType == ValueType.NULL) {
skip();
return null;
}
if (valueType != ValueType.NUMBER) {
throw reportError("readBigDecimal", "not number");
}
return new BigDecimal(IterImplForStreaming.readNumber(this));
}
public final BigInteger readBigInteger() throws IOException {
// skip whitespace by read next
ValueType valueType = whatIsNext();
if (valueType == ValueType.NULL) {
skip();
return null;
}
if (valueType != ValueType.NUMBER) {
throw reportError("readBigDecimal", "not number");
}
return new BigInteger(IterImplForStreaming.readNumber(this));
}
public final Any readAny() throws IOException {
try {
return IterImpl.readAny(this);
} catch (ArrayIndexOutOfBoundsException e) {
throw reportError("read", "premature end");
}
}
private final static ReadArrayCallback fillArray = new ReadArrayCallback() {
@Override
public boolean handle(JsonIterator iter, Object attachment) throws IOException {
List list = (List) attachment;
list.add(iter.read());
return true;
}
};
private final static ReadObjectCallback fillObject = new ReadObjectCallback() {
@Override
public boolean handle(JsonIterator iter, String field, Object attachment) throws IOException {
Map map = (Map) attachment;
map.put(field, iter.read());
return true;
}
};
public final Object read() throws IOException {
try {
ValueType valueType = whatIsNext();
switch (valueType) {
case STRING:
return readString();
case NUMBER:
double number = readDouble();
if (number == Math.floor(number) && !Double.isInfinite(number)) {
long longNumber = (long) number;
if (longNumber <= Integer.MAX_VALUE && longNumber >= Integer.MIN_VALUE) {
return (int) longNumber;
}
return longNumber;
}
return number;
case NULL:
IterImpl.skipFixedBytes(this, 4);
return null;
case BOOLEAN:
return readBoolean();
case ARRAY:
ArrayList list = new ArrayList(4);
readArrayCB(fillArray, list);
return list;
case OBJECT:
Map map = new HashMap(4);
readObjectCB(fillObject, map);
return map;
default:
throw reportError("read", "unexpected value type: " + valueType);
}
} catch (ArrayIndexOutOfBoundsException e) {
throw reportError("read", "premature end");
}
}
/**
* try to bind to existing object, returned object might not the same instance
*
* @param existingObject the object instance to reuse
* @param object type
* @return data binding result, might not be the same object
* @throws IOException if I/O went wrong
*/
public final T read(T existingObject) throws IOException {
try {
this.existingObject = existingObject;
Class clazz = existingObject.getClass();
String cacheKey = currentConfig().getDecoderCacheKey(clazz);
return (T) Codegen.getDecoder(cacheKey, clazz).decode(this);
} catch (ArrayIndexOutOfBoundsException e) {
throw reportError("read", "premature end");
}
}
private Config currentConfig() {
if (configCache == null) {
configCache = JsoniterSpi.getCurrentConfig();
}
return configCache;
}
/**
* try to bind to existing object, returned object might not the same instance
*
* @param typeLiteral the type object
* @param existingObject the object instance to reuse
* @param object type
* @return data binding result, might not be the same object
* @throws IOException if I/O went wrong
*/
public final T read(TypeLiteral typeLiteral, T existingObject) throws IOException {
try {
this.existingObject = existingObject;
String cacheKey = currentConfig().getDecoderCacheKey(typeLiteral.getType());
return (T) Codegen.getDecoder(cacheKey, typeLiteral.getType()).decode(this);
} catch (ArrayIndexOutOfBoundsException e) {
throw reportError("read", "premature end");
}
}
public final T read(Class clazz) throws IOException {
return (T) read((Type) clazz);
}
public final T read(TypeLiteral typeLiteral) throws IOException {
return (T) read(typeLiteral.getType());
}
public final Object read(Type type) throws IOException {
try {
String cacheKey = currentConfig().getDecoderCacheKey(type);
return Codegen.getDecoder(cacheKey, type).decode(this);
} catch (ArrayIndexOutOfBoundsException e) {
throw reportError("read", "premature end");
}
}
public ValueType whatIsNext() throws IOException {
ValueType valueType = valueTypes[IterImpl.nextToken(this)];
unreadByte();
return valueType;
}
public void skip() throws IOException {
IterImplSkip.skip(this);
}
public static final T deserialize(Config config, String input, Class clazz) {
JsoniterSpi.setCurrentConfig(config);
try {
return deserialize(input.getBytes(), clazz);
} finally {
JsoniterSpi.clearCurrentConfig();
}
}
public static final T deserialize(String input, Class clazz) {
return deserialize(input.getBytes(), clazz);
}
public static final T deserialize(Config config, String input, TypeLiteral typeLiteral) {
JsoniterSpi.setCurrentConfig(config);
try {
return deserialize(input.getBytes(), typeLiteral);
} finally {
JsoniterSpi.clearCurrentConfig();
}
}
public static final T deserialize(String input, TypeLiteral typeLiteral) {
return deserialize(input.getBytes(), typeLiteral);
}
public static final T deserialize(Config config, byte[] input, Class clazz) {
JsoniterSpi.setCurrentConfig(config);
try {
return deserialize(input, clazz);
} finally {
JsoniterSpi.clearCurrentConfig();
}
}
public static final T deserialize(byte[] input, Class clazz) {
int lastNotSpacePos = findLastNotSpacePos(input);
JsonIterator iter = JsonIteratorPool.borrowJsonIterator();
iter.reset(input, 0, lastNotSpacePos);
try {
T val = iter.read(clazz);
if (iter.head != lastNotSpacePos) {
throw iter.reportError("deserialize", "trailing garbage found");
}
return val;
} catch (ArrayIndexOutOfBoundsException e) {
throw iter.reportError("deserialize", "premature end");
} catch (IOException e) {
throw new JsonException(e);
} finally {
JsonIteratorPool.returnJsonIterator(iter);
}
}
public static final T deserialize(Config config, byte[] input, TypeLiteral typeLiteral) {
JsoniterSpi.setCurrentConfig(config);
try {
return deserialize(input, typeLiteral);
} finally {
JsoniterSpi.clearCurrentConfig();
}
}
public static final T deserialize(byte[] input, TypeLiteral typeLiteral) {
int lastNotSpacePos = findLastNotSpacePos(input);
JsonIterator iter = JsonIteratorPool.borrowJsonIterator();
iter.reset(input, 0, lastNotSpacePos);
try {
T val = iter.read(typeLiteral);
if (iter.head != lastNotSpacePos) {
throw iter.reportError("deserialize", "trailing garbage found");
}
return val;
} catch (ArrayIndexOutOfBoundsException e) {
throw iter.reportError("deserialize", "premature end");
} catch (IOException e) {
throw new JsonException(e);
} finally {
JsonIteratorPool.returnJsonIterator(iter);
}
}
public static final Any deserialize(Config config, String input) {
JsoniterSpi.setCurrentConfig(config);
try {
return deserialize(input.getBytes());
} finally {
JsoniterSpi.clearCurrentConfig();
}
}
public static final Any deserialize(String input) {
return deserialize(input.getBytes());
}
public static final Any deserialize(Config config, byte[] input) {
JsoniterSpi.setCurrentConfig(config);
try {
return deserialize(input);
} finally {
JsoniterSpi.clearCurrentConfig();
}
}
public static final Any deserialize(byte[] input) {
int lastNotSpacePos = findLastNotSpacePos(input);
JsonIterator iter = JsonIteratorPool.borrowJsonIterator();
iter.reset(input, 0, lastNotSpacePos);
try {
Any val = iter.readAny();
if (iter.head != lastNotSpacePos) {
throw iter.reportError("deserialize", "trailing garbage found");
}
return val;
} catch (ArrayIndexOutOfBoundsException e) {
throw iter.reportError("deserialize", "premature end");
} catch (IOException e) {
throw new JsonException(e);
} finally {
JsonIteratorPool.returnJsonIterator(iter);
}
}
private static int findLastNotSpacePos(byte[] input) {
for (int i = input.length - 1; i >= 0; i--) {
byte c = input[i];
if (c != ' ' && c != '\t' && c != '\n' && c != '\r') {
return i + 1;
}
}
return 0;
}
public static void setMode(DecodingMode mode) {
Config newConfig = JsoniterSpi.getDefaultConfig().copyBuilder().decodingMode(mode).build();
JsoniterSpi.setDefaultConfig(newConfig);
JsoniterSpi.setCurrentConfig(newConfig);
}
public static void enableStreamingSupport() {
if (isStreamingEnabled) {
return;
}
isStreamingEnabled = true;
try {
DynamicCodegen.enableStreamingSupport();
} catch (JsonException e) {
throw e;
} catch (Exception e) {
throw new JsonException(e);
}
}
}
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