com.google.gwt.query.vm.JsonBuilderHandler Maven / Gradle / Ivy
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/*
* Copyright 2014, The gwtquery team.
*
* 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.google.gwt.query.vm;
import com.google.gwt.query.client.Function;
import com.google.gwt.query.client.IsProperties;
import com.google.gwt.query.client.Properties;
import com.google.gwt.query.client.builders.JsonBuilder;
import com.google.gwt.query.client.builders.Name;
import com.google.gwt.query.rebind.JsonBuilderGenerator;
import com.google.gwt.query.vm.JsonFactoryJre.JreJsonFunction;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.List;
import elemental.json.Json;
import elemental.json.JsonArray;
import elemental.json.JsonBoolean;
import elemental.json.JsonNull;
import elemental.json.JsonNumber;
import elemental.json.JsonObject;
import elemental.json.JsonString;
import elemental.json.JsonValue;
/**
* Reflection handler for JsonBuilder implementation in JVM.
*/
public class JsonBuilderHandler implements InvocationHandler {
static JsonFactoryJre jsonFactory = new JsonFactoryJre();
private JsonObject jsonObject;
public JsonBuilderHandler() {
jsonObject = Json.createObject();
}
public JsonBuilderHandler(JsonObject j) {
jsonObject = j;
}
public JsonBuilderHandler(String payload) throws Throwable {
jsonObject = Json.parse(payload);
}
@SuppressWarnings("unchecked")
private Object jsonArrayToList(JsonArray j, Class ctype, boolean isArray) {
if (j == null) {
return null;
}
List l = new ArrayList<>();
for (int i = 0; j != null && i < j.length(); i++) {
l.add((T) getValue(j, i, null, null, ctype, null));
}
return l.isEmpty() ? Collections.emptyList() : isArray ? l.toArray((T[]) Array.newInstance(ctype, l.size())) : l;
}
private Double toDouble(String attr, JsonArray arr, int idx, JsonObject obj) {
try {
return obj != null ? obj.getNumber(attr) : arr.getNumber(idx);
} catch (Exception e) {
return 0d;
}
}
private Object getValue(JsonArray arr, int idx, JsonObject obj, String attr, Class clz,
Method method) {
if (clz.equals(Boolean.class) || clz == Boolean.TYPE) {
try {
return obj != null ? obj.getBoolean(attr) : arr.getBoolean(idx);
} catch (Exception e) {
return Boolean.FALSE;
}
} else if (clz.equals(Date.class)) {
return new Date((long) (obj != null ? obj.getNumber(attr) : arr.getNumber(idx)));
} else if (clz.equals(Byte.class) || clz == Byte.TYPE) {
return toDouble(attr, arr, idx, obj).byteValue();
} else if (clz.equals(Short.class) || clz == Short.TYPE) {
return toDouble(attr, arr, idx, obj).shortValue();
} else if (clz.equals(Integer.class) || clz == Integer.TYPE) {
return toDouble(attr, arr, idx, obj).intValue();
} else if (clz.equals(Double.class) || clz == Double.TYPE) {
return toDouble(attr, arr, idx, obj);
} else if (clz.equals(Float.class) || clz == Float.TYPE) {
return toDouble(attr, arr, idx, obj).floatValue();
} else if (clz.equals(Long.class) || clz == Long.TYPE) {
return toDouble(attr, arr, idx, obj).longValue();
}
Object ret = obj != null ? obj.get(attr) : arr.get(idx);
if (ret instanceof JreJsonFunction || clz.equals(Function.class)) {
return ret != null && ret instanceof JreJsonFunction ? ((JreJsonFunction) ret).getFunction()
: null;
} else if (ret instanceof JsonNull) {
return null;
} else if (ret instanceof JsonString) {
return ((JsonString) ret).asString();
} else if (ret instanceof JsonBoolean) {
return ((JsonBoolean) ret).asBoolean();
} else if (ret instanceof JsonNumber) {
return toDouble(attr, arr, idx, obj);
} else if (ret instanceof JsonArray || clz.isArray() || clz.equals(List.class)) {
Class ctype = Object.class;
if (clz.isArray()) {
ctype = clz.getComponentType();
} else {
Type returnType = method.getGenericReturnType();
if (returnType instanceof ParameterizedType) {
ctype = (Class) ((ParameterizedType) returnType).getActualTypeArguments()[0];
}
}
return jsonArrayToList(obj.getArray(attr), ctype, clz.isArray());
} else if (ret instanceof JsonObject) {
if (clz == Object.class) {
return jsonFactory.createBinder((JsonObject) ret);
} else if (IsProperties.class.isAssignableFrom(clz) && !clz.isAssignableFrom(ret.getClass())) {
return jsonFactory.create(clz, (JsonObject) ret);
}
}
return ret;
}
private JsonArray listToJsonArray(Object... l) throws Throwable {
JsonArray ret = Json.createArray();
for (Object o : l) {
setValue(ret, null, null, o);
}
return ret;
}
private Object setValue(JsonArray jsArr, JsonObject jsObj, String attr, Object val) {
if (val == null) {
return Json.createNull();
}
try {
Class valClaz = JsonValue.class;
if (val instanceof Number) {
val = ((Number) val).doubleValue();
valClaz = Double.TYPE;
} else if (val instanceof Boolean) {
valClaz = Boolean.TYPE;
} else if (val instanceof Date) {
val = ((Date) val).getTime();
valClaz = Double.TYPE;
} else if (val instanceof String) {
valClaz = String.class;
} else if (val instanceof IsProperties) {
val = ((IsProperties) val).getDataImpl();
} else if (val.getClass().isArray() || val instanceof List) {
val =
listToJsonArray(val.getClass().isArray() ? (Object[]) val : ((List) val).toArray());
} else if (val instanceof Function) {
val = new JreJsonFunction((Function) val);
}
if (jsObj != null) {
Method mth = jsObj.getClass().getMethod("put", String.class, valClaz);
mth.invoke(jsObj, new Object[] {attr, val});
return jsObj;
} else {
Method mth = jsArr.getClass().getMethod("set", Integer.TYPE, valClaz);
mth.invoke(jsArr, new Object[] {new Integer(jsArr.length()), val});
return jsArr;
}
} catch (Throwable e) {
e.printStackTrace();
}
return null;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
String mname = method.getName();
Class[] classes = method.getParameterTypes();
int largs = classes.length;
Name name = method.getAnnotation(Name.class);
String attr = name != null ? name.value() : methodName2AttrName(mname);
if ("getFieldNames".equals(mname)) {
return jsonObject.keys();
} else if ("as".equals(mname)) {
@SuppressWarnings("unchecked")
Class clz = (Class) args[0];
return jsonFactory.create(clz, jsonObject);
} else if ("getJsonName".equals(mname)) {
return JsonBuilderGenerator.classNameToJsonName(getDataBindingClassName(proxy.getClass()));
} else if (mname.matches("getProperties|getDataImpl")) {
return jsonObject;
} else if (largs > 0 && ("parse".equals(mname) || "load".equals(mname))) {
String json = String.valueOf(args[0]);
if (largs > 1 && Boolean.TRUE.equals(args[1])) {
json = Properties.wrapPropertiesString(json);
}
jsonObject = Json.parse(json);
} else if ("strip".equals(mname)) {
stripProxy((JsonBuilder) proxy);
} else if (mname.matches("toString")) {
return jsonObject.toString();
} else if (mname.matches("toJsonWithName")) {
String jsonName =
JsonBuilderGenerator.classNameToJsonName(getDataBindingClassName(proxy.getClass()));
return "{\"" + jsonName + "\":" + jsonObject.toString() + "}";
} else if (mname.matches("toJson")) {
return jsonObject.toString();
} else if ("toQueryString".equals(mname)) {
return param(jsonObject);
} else if (largs == 1 && mname.equals("get")) {
Class ret = method.getReturnType();
attr = String.valueOf(args[0]);
return getValue(null, 0, jsonObject, attr, ret, method);
} else if (largs == 0 || mname.startsWith("get")) {
Class ret = method.getReturnType();
return getValue(null, 0, jsonObject, attr, ret, method);
} else if (largs == 2 && mname.equals("set")) {
setValue(null, jsonObject, String.valueOf(args[0]), args[1]);
return proxy;
} else if (largs == 1 || mname.startsWith("set")) {
setValue(null, jsonObject, attr, args[0]);
return proxy;
}
return null;
}
public String methodName2AttrName(String s) {
return deCapitalize(s.replaceFirst("^[gs]et", ""));
}
private String deCapitalize(String s) {
return s != null && s.length() > 0 ? s.substring(0, 1).toLowerCase() + s.substring(1) : s;
}
/*
* This method removes all the json which is not mapped into a
* method inside the JsonBuilder Object.
* Also if the proxy contains another JsonBuilder in their methods
* the method strip() is called.
*/
private void stripProxy(JsonBuilder proxy) throws Throwable {
Class type = proxy.getClass().getInterfaces()[0];
HashSet validAttrs = getAttributeNames(type.getMethods());
Hashtable ispropertyGetters = getJsonBuilders(type.getMethods());
for (String key : jsonObject.keys()) {
String name = methodName2AttrName(key);
if (!validAttrs.contains(name)) {
jsonObject.remove(key);
continue;
}
Method ispropertyGetter = ispropertyGetters.get(name);
if (ispropertyGetter != null) {
((IsProperties) invoke(proxy, ispropertyGetter, new Object[] {})).strip();
}
}
}
private String getDataBindingClassName(Class type) {
for (Class c : type.getInterfaces()) {
if (c.equals(JsonBuilder.class)) {
return type.getName();
} else {
return getDataBindingClassName(c);
}
}
return null;
}
private String param(JsonObject o) {
String ret = "";
for (String k : o.keys()) {
ret += ret.isEmpty() ? "" : "&";
JsonValue v = o.get(k);
if (v instanceof JsonArray) {
for (int i = 0, l = ((JsonArray) v).length(); i < l; i++) {
ret += i > 0 ? "&" : "";
JsonValue e = ((JsonArray) v).get(i);
ret += k + "[]=" + e.toJson();
}
} else {
if (v != null && !(v instanceof JsonNull)) {
ret += k + "=" + v.toJson();
}
}
}
return ret;
}
private HashSet getAttributeNames(Method[] methods) {
HashSet valid = new HashSet<>();
if (methods == null || methods.length == 0) {
return valid;
}
for (Method m : methods) {
String attr = methodName2AttrName(m.getName());
Name annotation = m.getAnnotation(Name.class);
if (annotation != null) {
attr = annotation.value();
}
valid.add(attr);
}
return valid;
}
private Hashtable getJsonBuilders(Method[] methods) {
Hashtable ispropertyGetters = new Hashtable<>();
if (methods == null || methods.length == 0) {
return ispropertyGetters;
}
for (Method m : methods) {
Class[] classes = m.getParameterTypes();
boolean isJsonBuilder =
classes.length == 0 && IsProperties.class.isAssignableFrom(m.getReturnType());
if (isJsonBuilder) {
String attr = methodName2AttrName(m.getName());
ispropertyGetters.put(attr, m);
}
}
return ispropertyGetters;
}
}