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Fastjson is a JSON processor (JSON parser + JSON generator) written in Java
package com.alibaba.fastjson2.util;
import com.alibaba.fastjson2.JSONB;
import com.alibaba.fastjson2.JSONException;
import com.alibaba.fastjson2.JSONReader;
import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.annotation.JSONCreator;
import com.alibaba.fastjson2.reader.ObjectReader;
import com.alibaba.fastjson2.support.LambdaMiscCodec;
import com.alibaba.fastjson2.writer.ObjectWriter;
import java.lang.reflect.Type;
import java.util.function.BiFunction;
import java.util.function.Function;
import static com.alibaba.fastjson2.JSONB.Constants.BC_TYPED_ANY;
public interface ApacheLang3Support {
interface TripleMixIn {
@JSONCreator
static Object of(L left, M middle, R right) {
return null;
}
}
class PairReader
implements ObjectReader {
static final long LEFT = Fnv.hashCode64("left");
static final long RIGHT = Fnv.hashCode64("right");
final Class objectClass;
final Type leftType;
final Type rightType;
final BiFunction of;
public PairReader(Class objectClass, Type leftType, Type rightType) {
this.objectClass = objectClass;
this.leftType = leftType;
this.rightType = rightType;
try {
of = LambdaMiscCodec.createBiFunction(
objectClass.getMethod("of", Object.class, Object.class)
);
} catch (NoSuchMethodException e) {
throw new JSONException("Pair.of method not found", e);
}
}
@Override
public Object readJSONBObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {
if (jsonReader.nextIfNull()) {
return null;
}
if (jsonReader.nextIfMatch(BC_TYPED_ANY)) {
long typeHash = jsonReader.readTypeHashCode();
final long PAIR = 4645080105124911238L; // Fnv.hashCode64("org.apache.commons.lang3.tuple.Pair");
final long MUTABLE_PAIR = 8310287657375596772L; // Fnv.hashCode64("org.apache.commons.lang3.tuple.MutablePair");
final long IMMUTABLE_PAIR = -2802985644706367574L; // Fnv.hashCode64("org.apache.commons.lang3.tuple.ImmutablePair");
if (typeHash != PAIR && typeHash != IMMUTABLE_PAIR && typeHash != MUTABLE_PAIR) {
throw new JSONException("not support inputType : " + jsonReader.getString());
}
}
Object left = null, right = null;
if (jsonReader.nextIfObjectStart()) {
for (int i = 0; i < 100; i++) {
if (jsonReader.nextIfObjectEnd()) {
break;
}
if (jsonReader.isString()) {
long hashCode = jsonReader.readFieldNameHashCode();
if (hashCode == LEFT) {
left = jsonReader.read(leftType);
} else if (hashCode == RIGHT) {
right = jsonReader.read(rightType);
} else if (i == 0) {
left = jsonReader.getFieldName();
right = jsonReader.read(rightType);
} else {
jsonReader.skipValue();
}
} else if (i == 0) {
left = jsonReader.read(leftType);
right = jsonReader.read(rightType);
} else {
throw new JSONException(jsonReader.info("not support input"));
}
}
} else if (jsonReader.isArray()) {
int len = jsonReader.startArray();
if (len != 2) {
throw new JSONException(jsonReader.info("not support input"));
}
left = jsonReader.read(leftType);
right = jsonReader.read(rightType);
} else {
throw new JSONException(jsonReader.info("not support input"));
}
return of.apply(left, right);
}
@Override
public Object readObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {
if (jsonReader.nextIfNull()) {
return null;
}
Object left = null, right = null;
if (jsonReader.nextIfObjectStart()) {
for (int i = 0; i < 100; i++) {
if (jsonReader.nextIfObjectEnd()) {
break;
}
if (jsonReader.isString()) {
long hashCode = jsonReader.readFieldNameHashCode();
if (hashCode == LEFT) {
left = jsonReader.read(leftType);
} else if (hashCode == RIGHT) {
right = jsonReader.read(rightType);
} else if (i == 0) {
left = jsonReader.getFieldName();
jsonReader.nextIfMatch(':');
right = jsonReader.read(rightType);
} else {
jsonReader.skipValue();
}
} else if (i == 0) {
left = jsonReader.read(leftType);
jsonReader.nextIfMatch(':');
right = jsonReader.read(rightType);
} else {
throw new JSONException(jsonReader.info("not support input"));
}
}
} else if (jsonReader.nextIfArrayStart()) {
left = jsonReader.read(leftType);
right = jsonReader.read(rightType);
if (!jsonReader.nextIfArrayEnd()) {
throw new JSONException(jsonReader.info("not support input"));
}
} else {
throw new JSONException(jsonReader.info("not support input"));
}
return of.apply(left, right);
}
}
class PairWriter
implements ObjectWriter {
final Class objectClass;
final String typeName;
final long typeNameHash;
Function left;
Function right;
byte[] typeNameJSONB;
static final byte[] leftName = JSONB.toBytes("left");
static final byte[] rightName = JSONB.toBytes("right");
public PairWriter(Class objectClass) {
this.objectClass = objectClass;
this.typeName = objectClass.getName();
this.typeNameHash = Fnv.hashCode64(typeName);
}
@Override
public void writeJSONB(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
if (object == null) {
jsonWriter.writeNull();
return;
}
if ((jsonWriter.getFeatures(features) & JSONWriter.Feature.WriteClassName.mask) != 0) {
if (typeNameJSONB == null) {
typeNameJSONB = JSONB.toBytes(typeName);
}
jsonWriter.writeTypeName(typeNameJSONB, typeNameHash);
}
jsonWriter.startObject();
Object left = getLeft(object);
Object right = getRight(object);
jsonWriter.writeNameRaw(leftName, PairReader.LEFT);
jsonWriter.writeAny(left);
jsonWriter.writeNameRaw(rightName, PairReader.RIGHT);
jsonWriter.writeAny(right);
jsonWriter.endObject();
}
@Override
public void write(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
if (object == null) {
jsonWriter.writeNull();
return;
}
Object left = getLeft(object);
Object right = getRight(object);
jsonWriter.startObject();
if ((jsonWriter.getFeatures(features) & JSONWriter.Feature.WritePairAsJavaBean.mask) != 0) {
jsonWriter.writeName("left");
jsonWriter.writeColon();
jsonWriter.writeAny(left);
jsonWriter.writeName("right");
} else {
jsonWriter.writeNameAny(left);
}
jsonWriter.writeColon();
jsonWriter.writeAny(right);
jsonWriter.endObject();
}
Object getLeft(Object object) {
Class objectClass = object.getClass();
if (left == null) {
try {
left = LambdaMiscCodec.createFunction(
objectClass.getMethod("getLeft")
);
} catch (NoSuchMethodException e) {
throw new JSONException("getLeft method not found", e);
}
}
return left.apply(object);
}
Object getRight(Object object) {
Class objectClass = object.getClass();
if (right == null) {
try {
right = LambdaMiscCodec.createFunction(
objectClass.getMethod("getRight")
);
} catch (NoSuchMethodException e) {
throw new JSONException("getRight method not found", e);
}
}
return right.apply(object);
}
}
}