1 files changed, 145 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/binding-comet-runtime/src/main/java/org/apache/tuscany/sca/binding/comet/runtime/JSONUtil.java b/sca-java-2.x/tags/2.0.1-RC1/modules/binding-comet-runtime/src/main/java/org/apache/tuscany/sca/binding/comet/runtime/JSONUtil.java
new file mode 100644
index 0000000000..79ec156131
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/binding-comet-runtime/src/main/java/org/apache/tuscany/sca/binding/comet/runtime/JSONUtil.java
@@ -0,0 +1,145 @@
+/*
+ * 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);
+    }
+
+}