fastjson-JSONObject-类JSON互转

/*

  • Copyright 1999-2017 Alibaba Group.
  • Licensed under the Apache License, Version 2.0 (the "License");
  • you may not use this file except in compliance with the License.
  • You may obtain a copy of the License at
  •  http://www.apache.org/licenses/LICENSE-2.0
  • Unless required by applicable law or agreed to in writing, software
  • distributed under the License is distributed on an "AS IS" BASIS,
  • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  • See the License for the specific language governing permissions and
  • limitations under the License.
    */
    package com.alibaba.fastjson;

import static com.alibaba.fastjson.util.TypeUtils.castToBigDecimal;
import static com.alibaba.fastjson.util.TypeUtils.castToBigInteger;
import static com.alibaba.fastjson.util.TypeUtils.castToBoolean;
import static com.alibaba.fastjson.util.TypeUtils.castToByte;
import static com.alibaba.fastjson.util.TypeUtils.castToBytes;
import static com.alibaba.fastjson.util.TypeUtils.castToDate;
import static com.alibaba.fastjson.util.TypeUtils.castToDouble;
import static com.alibaba.fastjson.util.TypeUtils.castToFloat;
import static com.alibaba.fastjson.util.TypeUtils.castToInt;
import static com.alibaba.fastjson.util.TypeUtils.castToLong;
import static com.alibaba.fastjson.util.TypeUtils.castToShort;
import static com.alibaba.fastjson.util.TypeUtils.castToSqlDate;
import static com.alibaba.fastjson.util.TypeUtils.castToTimestamp;

import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.List;

import com.alibaba.fastjson.annotation.JSONField;
import com.alibaba.fastjson.parser.Feature;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.util.TypeUtils;

public class JSONObject extends JSON implements Map<String, Object>, Cloneable, Serializable, InvocationHandler {

private static final long         serialVersionUID         = 1L;
private static final int          DEFAULT_INITIAL_CAPACITY = 16;

private final Map<String, Object> map;

public JSONObject(){
    this(DEFAULT_INITIAL_CAPACITY, false);
}

public JSONObject(Map<String, Object> map){
    if (map == null) {
        throw new IllegalArgumentException("map is null.");
    }
    this.map = map;
}

public JSONObject(boolean ordered){
    this(DEFAULT_INITIAL_CAPACITY, ordered);
}

public JSONObject(int initialCapacity){
    this(initialCapacity, false);
}

public JSONObject(int initialCapacity, boolean ordered){
    if (ordered) {
        map = new LinkedHashMap<String, Object>(initialCapacity);
    } else {
        map = new HashMap<String, Object>(initialCapacity);
    }
}

public int size() {
    return map.size();
}

public boolean isEmpty() {
    return map.isEmpty();
}

public boolean containsKey(Object key) {
    boolean result = map.containsKey(key);
    if ((!result) && key instanceof Number) {
        result = map.containsKey(key.toString());
    }
    return result;
}

public boolean containsValue(Object value) {
    return map.containsValue(value);
}

public Object get(Object key) {
    Object val = map.get(key);

    if (val == null && key instanceof Number) {
        val = map.get(key.toString());
    }

    return val;
}

public JSONObject getJSONObject(String key) {
    Object value = map.get(key);

    if (value instanceof JSONObject) {
        return (JSONObject) value;
    }

    if (value instanceof Map) {
        return new JSONObject((Map) value);
    }

    if (value instanceof String) {
        return JSON.parseObject((String) value);
    }

    return (JSONObject) toJSON(value);
}

public JSONArray getJSONArray(String key) {
    Object value = map.get(key);

    if (value instanceof JSONArray) {
        return (JSONArray) value;
    }

    if (value instanceof List) {
        return new JSONArray((List) value);
    }

    if (value instanceof String) {
        return (JSONArray) JSON.parse((String) value);
    }

    return (JSONArray) toJSON(value);
}

public <T> T getObject(String key, Class<T> clazz) {
    Object obj = map.get(key);
    return TypeUtils.castToJavaBean(obj, clazz);
}

public <T> T getObject(String key, Type type) {
    Object obj = map.get(key);
    return TypeUtils.cast(obj, type, ParserConfig.getGlobalInstance());
}

public <T> T getObject(String key, TypeReference typeReference) {
    Object obj = map.get(key);
    if (typeReference == null) {
        return (T) obj;
    }
    return TypeUtils.cast(obj, typeReference.getType(), ParserConfig.getGlobalInstance());
}

public Boolean getBoolean(String key) {
    Object value = get(key);

    if (value == null) {
        return null;
    }

    return castToBoolean(value);
}

public byte[] getBytes(String key) {
    Object value = get(key);

    if (value == null) {
        return null;
    }

    return castToBytes(value);
}

public boolean getBooleanValue(String key) {
    Object value = get(key);

    Boolean booleanVal = castToBoolean(value);
    if (booleanVal == null) {
        return false;
    }

    return booleanVal.booleanValue();
}

public Byte getByte(String key) {
    Object value = get(key);

    return castToByte(value);
}

public byte getByteValue(String key) {
    Object value = get(key);

    Byte byteVal = castToByte(value);
    if (byteVal == null) {
        return 0;
    }

    return byteVal.byteValue();
}

public Short getShort(String key) {
    Object value = get(key);

    return castToShort(value);
}

public short getShortValue(String key) {
    Object value = get(key);

    Short shortVal = castToShort(value);
    if (shortVal == null) {
        return 0;
    }

    return shortVal.shortValue();
}

public Integer getInteger(String key) {
    Object value = get(key);

    return castToInt(value);
}

public int getIntValue(String key) {
    Object value = get(key);

    Integer intVal = castToInt(value);
    if (intVal == null) {
        return 0;
    }

    return intVal.intValue();
}

public Long getLong(String key) {
    Object value = get(key);

    return castToLong(value);
}

public long getLongValue(String key) {
    Object value = get(key);

    Long longVal = castToLong(value);
    if (longVal == null) {
        return 0L;
    }

    return longVal.longValue();
}

public Float getFloat(String key) {
    Object value = get(key);

    return castToFloat(value);
}

public float getFloatValue(String key) {
    Object value = get(key);

    Float floatValue = castToFloat(value);
    if (floatValue == null) {
        return 0F;
    }

    return floatValue.floatValue();
}

public Double getDouble(String key) {
    Object value = get(key);

    return castToDouble(value);
}

public double getDoubleValue(String key) {
    Object value = get(key);

    Double doubleValue = castToDouble(value);
    if (doubleValue == null) {
        return 0D;
    }

    return doubleValue.doubleValue();
}

public BigDecimal getBigDecimal(String key) {
    Object value = get(key);

    return castToBigDecimal(value);
}

public BigInteger getBigInteger(String key) {
    Object value = get(key);

    return castToBigInteger(value);
}

public String getString(String key) {
    Object value = get(key);

    if (value == null) {
        return null;
    }

    return value.toString();
}

public Date getDate(String key) {
    Object value = get(key);

    return castToDate(value);
}

public java.sql.Date getSqlDate(String key) {
    Object value = get(key);

    return castToSqlDate(value);
}

public java.sql.Timestamp getTimestamp(String key) {
    Object value = get(key);

    return castToTimestamp(value);
}

public Object put(String key, Object value) {
    return map.put(key, value);
}

public JSONObject fluentPut(String key, Object value) {
    map.put(key, value);
    return this;
}

public void putAll(Map<? extends String, ? extends Object> m) {
    map.putAll(m);
}

public JSONObject fluentPutAll(Map<? extends String, ? extends Object> m) {
    map.putAll(m);
    return this;
}

public void clear() {
    map.clear();
}

public JSONObject fluentClear() {
    map.clear();
    return this;
}

public Object remove(Object key) {
    return map.remove(key);
}

public JSONObject fluentRemove(Object key) {
    map.remove(key);
    return this;
}

public Set<String> keySet() {
    return map.keySet();
}

public Collection<Object> values() {
    return map.values();
}

public Set<Map.Entry<String, Object>> entrySet() {
    return map.entrySet();
}

@Override
public Object clone() {
    return new JSONObject(map instanceof LinkedHashMap //
            ? new LinkedHashMap<String, Object>(map) //
            : new HashMap<String, Object>(map)
    );
}

public boolean equals(Object obj) {
    return this.map.equals(obj);
}

public int hashCode() {
    return this.map.hashCode();
}

public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    Class<?>[] parameterTypes = method.getParameterTypes();
    if (parameterTypes.length == 1) {
        if (method.getName().equals("equals")) {
            return this.equals(args[0]);
        }

        Class<?> returnType = method.getReturnType();
        if (returnType != void.class) {
            throw new JSONException("illegal setter");
        }

        String name = null;
        JSONField annotation = TypeUtils.getAnnotation(method, JSONField.class);
        if (annotation != null) {
            if (annotation.name().length() != 0) {
                name = annotation.name();
            }
        }

        if (name == null) {
            name = method.getName();

            if (!name.startsWith("set")) {
                throw new JSONException("illegal setter");
            }

            name = name.substring(3);
            if (name.length() == 0) {
                throw new JSONException("illegal setter");
            }
            name = Character.toLowerCase(name.charAt(0)) + name.substring(1);
        }

        map.put(name, args[0]);
        return null;
    }

    if (parameterTypes.length == 0) {
        Class<?> returnType = method.getReturnType();
        if (returnType == void.class) {
            throw new JSONException("illegal getter");
        }

        String name = null;
        JSONField annotation = TypeUtils.getAnnotation(method, JSONField.class);
        if (annotation != null) {
            if (annotation.name().length() != 0) {
                name = annotation.name();
            }
        }

        if (name == null) {
            name = method.getName();
            if (name.startsWith("get")) {
                name = name.substring(3);
                if (name.length() == 0) {
                    throw new JSONException("illegal getter");
                }
                name = Character.toLowerCase(name.charAt(0)) + name.substring(1);
            } else if (name.startsWith("is")) {
                name = name.substring(2);
                if (name.length() == 0) {
                    throw new JSONException("illegal getter");
                }
                name = Character.toLowerCase(name.charAt(0)) + name.substring(1);
            } else if (name.startsWith("hashCode")) {
                return this.hashCode();
            } else if (name.startsWith("toString")) {
                return this.toString();
            } else {
                throw new JSONException("illegal getter");
            }
        }

        Object value = map.get(name);
        return TypeUtils.cast(value, method.getGenericReturnType(), ParserConfig.getGlobalInstance());
    }

    throw new UnsupportedOperationException(method.toGenericString());
}

public Map<String, Object> getInnerMap() {
    return this.map;
}



private void readObject(final java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
    SecureObjectInputStream.ensureFields();
    if (SecureObjectInputStream.fields != null && !SecureObjectInputStream.fields_error) {
        ObjectInputStream secIn = new SecureObjectInputStream(in);
        try {
            secIn.defaultReadObject();
            return;
        } catch (java.io.NotActiveException e) {
            // skip
        }
    }

    in.defaultReadObject();
    for (Entry entry : map.entrySet()) {
        final Object key = entry.getKey();
        if (key != null) {
            ParserConfig.global.checkAutoType(key.getClass());
        }

        final Object value = entry.getValue();
        if (value != null) {
            ParserConfig.global.checkAutoType(value.getClass());
        }
    }
}

static class SecureObjectInputStream extends ObjectInputStream {
    static Field[] fields;
    static volatile boolean fields_error;

    static void ensureFields() {
        if (fields == null && !fields_error) {
            try {
                final Field[] declaredFields = ObjectInputStream.class.getDeclaredFields();
                String[] fieldnames = new String[]{"bin", "passHandle", "handles", "curContext"};
                Field[] array = new Field[fieldnames.length];
                for (int i = 0; i < fieldnames.length; i++) {
                    Field field = TypeUtils
                            .getField(ObjectInputStream.class
                                    , fieldnames[i]
                                    , declaredFields
                            );
                    field.setAccessible(true);
                    array[i] = field;
                }
                fields = array;
            } catch (Throwable error) {
                fields_error = true;
            }
        }
    }

    public SecureObjectInputStream(ObjectInputStream in) throws IOException {
        super(in);
        try {
            for (int i = 0; i < fields.length; i++) {
                final Field field = fields[i];
                final Object value = field.get(in);
                field.set(this, value);
            }
        } catch (IllegalAccessException e) {
            fields_error = true;
        }
    }

    protected Class<?> resolveClass(ObjectStreamClass desc)
            throws IOException, ClassNotFoundException {
        String name = desc.getName();
        if (name.length() > 2) {
            int index = name.lastIndexOf('[');
            if (index != -1) {
                name = name.substring(index + 1);
            }
            if (name.length() > 2 && name.charAt(0) == 'L' && name.charAt(name.length() - 1) == ';') {
                name = name.substring(1, name.length() - 1);
            }
            ParserConfig.global.checkAutoType(name, null, Feature.SupportAutoType.mask);
        }
        return super.resolveClass(desc);
    }

    protected Class<?> resolveProxyClass(String[] interfaces)
            throws IOException, ClassNotFoundException {
        for (String interfacename : interfaces) {
            //检查是否处于黑名单
            ParserConfig.global.checkAutoType(interfacename, null);
        }
        return super.resolveProxyClass(interfaces);
    }

    //Hack:默认构造方法会调用这个方法，重写此方法使用反射还原部分关键属性
    protected void readStreamHeader() throws IOException, StreamCorruptedException {

    }
}

public <T> T toJavaObject(Class<T> clazz) {
    if (clazz == Map.class || clazz == JSONObject.class || clazz == JSON.class) {
        return (T) this;
    }

    if (clazz == Object.class && !containsKey(JSON.DEFAULT_TYPE_KEY)) {
        return (T) this;
    }

    return TypeUtils.castToJavaBean(this, clazz, ParserConfig.getGlobalInstance());
}

public <T> T toJavaObject(Class<T> clazz, ParserConfig config, int features) {
    if (clazz == Map.class) {
        return (T) this;
    }

    if (clazz == Object.class && !containsKey(JSON.DEFAULT_TYPE_KEY)) {
        return (T) this;
    }

    return TypeUtils.castToJavaBean(this, clazz, config);
}

}

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