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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.tuscany.sca.binding.comet.runtime;
import java.util.ArrayList;
import java.util.List;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import com.google.gson.Gson;
/**
* Helper class to facilitate JSON convertions.
*/
public class JSONUtil {
private static Gson gson = new Gson();
/**
* Convert request parameters from JSON to operation parameter types.
*
* @param jsonData
* parameters in JSON array format
* @param operation
* the operation to invoke
* @return an array of objects
*/
public static Object[] decodeJsonParamsForOperation(String jsonData, Operation operation) {
Object[] args = new Object[operation.getInputType().getLogical().size()];
final String[] json = parseArray(jsonData);
int index = 0;
for (final DataType<?> dataType : operation.getInputType().getLogical()) {
args[index] = gson.fromJson(json[index], dataType.getPhysical());
index++;
}
return args;
}
/**
* Split the JSON array containing the arguments for the method call in
* order to avoid converting JSON to Object[]. Converting each object
* separately to it's corresponding type avoids type mismatch problems at
* service invocation.
*
* @param jsonArray
* the JSON array
* @return an array of JSON formatted strings
*/
private static String[] parseArray(String jsonArray) {
List<String> objects = new ArrayList<String>();
int bracketNum = 0;
int parNum = 0;
int quoteNum = 0;
int startPos = 1;
for (int i = 0; i < jsonArray.length(); i++) {
switch (jsonArray.charAt(i)) {
case '{':
bracketNum++;
break;
case '}':
bracketNum--;
break;
case '[':
parNum++;
break;
case ']':
parNum--;
break;
case '\"':
quoteNum++;
break;
case ',':
if ((bracketNum == 0) && (parNum == 1) && quoteNum % 2 == 0) {
objects.add(jsonArray.substring(startPos, i));
startPos = i + 1;
}
}
}
objects.add(jsonArray.substring(startPos, jsonArray.length() - 1));
return objects.toArray(new String[] {});
}
private JSONUtil() {
}
/**
* Converts a Java object to JSON format.
*
* @param response
* the response to convert
* @return the object in JSON format
*/
public static String encodeResponse(Object response) {
return gson.toJson(response);
}
/**
* Convert request parameters as JSON array.
*
* @param params
* request parameters
* @return request parameters as JSON array
*/
public static String encodeRequestParams(Object[] params) {
StringBuilder builder = new StringBuilder();
for (int index = 0; index < params.length; index++) {
Object param = params[index];
builder.append(index == 0 ? "[" : ",");
builder.append(gson.toJson(param));
}
builder.append("]");
return builder.toString();
}
/**
* Decode JSON to a given Java type.
*
* @param responseJSON
* the json to convert
* @param returnType
* the return type to convert to
* @return the converted object
*/
public static Object decodeResponse(String responseJSON, Class<?> returnType) {
return gson.fromJson(responseJSON, returnType);
}
}
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