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ReflectionMapDecoder.java
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64 lines (56 loc) · 1.91 KB
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package com.jsoniter;
import com.jsoniter.spi.*;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Type;
import java.util.Map;
class ReflectionMapDecoder implements Decoder {
private final Constructor ctor;
private final Decoder valueTypeDecoder;
private final Decoder mapKeyDecoder;
public ReflectionMapDecoder(Class clazz, Type[] typeArgs) {
try {
ctor = clazz.getConstructor();
} catch (NoSuchMethodException e) {
throw new JsonException(e);
}
Type keyType = typeArgs[0];
mapKeyDecoder = MapKeyDecoders.registerOrGetExisting(keyType);
TypeLiteral valueTypeLiteral = TypeLiteral.create(typeArgs[1]);
valueTypeDecoder = Codegen.getDecoder(valueTypeLiteral.getDecoderCacheKey(), typeArgs[1]);
}
@Override
public Object decode(JsonIterator iter) throws IOException {
try {
return decode_(iter);
} catch (JsonException e) {
throw e;
} catch (Exception e) {
throw new JsonException(e);
}
}
private Object decode_(JsonIterator iter) throws Exception {
Map map = (Map) CodegenAccess.resetExistingObject(iter);
if (iter.readNull()) {
return null;
}
if (map == null) {
map = (Map) ctor.newInstance();
}
if (!CodegenAccess.readObjectStart(iter)) {
return map;
}
do {
Object decodedMapKey = readMapKey(iter);
map.put(decodedMapKey, valueTypeDecoder.decode(iter));
} while(CodegenAccess.nextToken(iter) == ',');
return map;
}
private Object readMapKey(JsonIterator iter) throws IOException {
Object key = mapKeyDecoder.decode(iter);
if (':' != IterImpl.nextToken(iter)) {
throw iter.reportError("readMapKey", "expect :");
}
return key;
}
}