java/src/main/java/com/jsoniter/JsonIterator.java at master · json-iterator/java · GitHub

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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;

// Whenever buf is not large enough new one is created with size of

// buf.length + autoExpandBufferStep. Set to < 1 to disable auto expanding.

int autoExpandBufferStep;

int head;

int tail;

int skipStartedAt = -1; // skip should keep bytes starting at this pos

Map<String, Object> 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;

}

private JsonIterator(InputStream in, byte[] buf, int autoExpandBufferStep) {

this(in, buf, 0, 0);

this.autoExpandBufferStep = autoExpandBufferStep;

}

public JsonIterator() {

this(null, new byte[0], 0, 0);

}

public static JsonIterator parse(InputStream in, int bufSize) {

return parse(in, bufSize, bufSize);

}

public static JsonIterator parse(InputStream in, int bufSize, int autoExpandBufferStep) {

enableStreamingSupport();

return new JsonIterator(in, new byte[bufSize], autoExpandBufferStep);

}

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 {

IterImplForStreaming.numberChars numberChars = IterImplForStreaming.readNumber(this);

return new String(numberChars.chars, 0, numberChars.charsLength);

}

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");

}

IterImplForStreaming.numberChars numberChars = IterImplForStreaming.readNumber(this);

return new BigDecimal(numberChars.chars, 0, numberChars.charsLength);

}

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");

}

IterImplForStreaming.numberChars numberChars = IterImplForStreaming.readNumber(this);

return new BigInteger(new String(numberChars.chars, 0, numberChars.charsLength));

}

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:

IterImplForStreaming.numberChars numberChars = IterImplForStreaming.readNumber(this);

String numberStr = new String(numberChars.chars, 0, numberChars.charsLength);

Double number = Double.valueOf(numberStr);

if (numberChars.dotFound) {

return number;

}

double doubleNumber = number;

if (doubleNumber == Math.floor(doubleNumber) && !Double.isInfinite(doubleNumber)) {

long longNumber = Long.valueOf(numberStr);

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 <T> object type

* @return data binding result, might not be the same object

* @throws IOException if I/O went wrong

public final <T> 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 <T> object type

* @return data binding result, might not be the same object

* @throws IOException if I/O went wrong

public final <T> T read(TypeLiteral<T> 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> T read(Class<T> clazz) throws IOException {

return (T) read((Type) clazz);

}

public final <T> T read(TypeLiteral<T> 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> T deserialize(Config config, String input, Class<T> clazz) {

JsoniterSpi.setCurrentConfig(config);

try {

return deserialize(input.getBytes(), clazz);

} finally {

JsoniterSpi.clearCurrentConfig();

}

public static final <T> T deserialize(String input, Class<T> clazz) {

return deserialize(input.getBytes(), clazz);

}

public static final <T> T deserialize(Config config, String input, TypeLiteral<T> typeLiteral) {

JsoniterSpi.setCurrentConfig(config);

try {

return deserialize(input.getBytes(), typeLiteral);

} finally {

JsoniterSpi.clearCurrentConfig();

}

public static final <T> T deserialize(String input, TypeLiteral<T> typeLiteral) {

return deserialize(input.getBytes(), typeLiteral);

}

public static final <T> T deserialize(Config config, byte[] input, Class<T> clazz) {

JsoniterSpi.setCurrentConfig(config);

try {

return deserialize(input, clazz);

} finally {

JsoniterSpi.clearCurrentConfig();

}

public static final <T> T deserialize(byte[] input, Class<T> 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> T deserialize(Config config, byte[] input, TypeLiteral<T> typeLiteral) {

JsoniterSpi.setCurrentConfig(config);

try {

return deserialize(input, typeLiteral);

} finally {

JsoniterSpi.clearCurrentConfig();

}

public static final <T> T deserialize(byte[] input, TypeLiteral<T> 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);

}

java/src/main/java/com/jsoniter/JsonIterator.java at master · json-iterator/java · GitHub

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