BUG 1204 - exception if multiple container node occures

[controller.git] / opendaylight / md-sal / sal-rest-connector / src / main / java / org / opendaylight / controller / sal / rest / gson / JsonParser.java

diff --git a/opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/rest/gson/JsonParser.java b/opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/rest/gson/JsonParser.java
new file mode 100644 (file)
index 0000000..f3b61de
--- /dev/null
+++ b/opendaylight/md-sal/sal-rest-connector/src/main/java/org/opendaylight/controller/sal/rest/gson/JsonParser.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.sal.rest.gson;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonIOException;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSyntaxException;
+import com.google.gson.internal.LazilyParsedNumber;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.MalformedJsonException;
+import java.io.EOFException;
+import java.io.IOException;
+
+/**
+ * This class parses JSON elements from a gson JsonReader. It disallows multiple
+ * elements of the same name unlike the default gson JsonParser."
+ */
+public class JsonParser {
+    public JsonElement parse(JsonReader reader) throws JsonIOException, JsonSyntaxException {
+        // code copied from gson's JsonParser and Stream classes
+
+        boolean lenient = reader.isLenient();
+        reader.setLenient(true);
+        boolean isEmpty = true;
+        try {
+            reader.peek();
+            isEmpty = false;
+            return read(reader);
+        } catch (EOFException e) {
+            if (isEmpty) {
+                return JsonNull.INSTANCE;
+            }
+            // The stream ended prematurely so it is likely a syntax error.
+            throw new JsonSyntaxException(e);
+        } catch (MalformedJsonException e) {
+            throw new JsonSyntaxException(e);
+        } catch (IOException e) {
+            throw new JsonIOException(e);
+        } catch (NumberFormatException e) {
+            throw new JsonSyntaxException(e);
+        } catch (StackOverflowError | OutOfMemoryError e) {
+            throw new JsonParseException("Failed parsing JSON source: " + reader + " to Json", e);
+        } finally {
+            reader.setLenient(lenient);
+        }
+    }
+
+    public JsonElement read(JsonReader in) throws IOException {
+        switch (in.peek()) {
+        case STRING:
+            return new JsonPrimitive(in.nextString());
+        case NUMBER:
+            String number = in.nextString();
+            return new JsonPrimitive(new LazilyParsedNumber(number));
+        case BOOLEAN:
+            return new JsonPrimitive(in.nextBoolean());
+        case NULL:
+            in.nextNull();
+            return JsonNull.INSTANCE;
+        case BEGIN_ARRAY:
+            JsonArray array = new JsonArray();
+            in.beginArray();
+            while (in.hasNext()) {
+                array.add(read(in));
+            }
+            in.endArray();
+            return array;
+        case BEGIN_OBJECT:
+            JsonObject object = new JsonObject();
+            in.beginObject();
+            while (in.hasNext()) {
+                final String childName = in.nextName();
+                if (object.has(childName)) {
+                    throw new JsonSyntaxException("Duplicate name " + childName + " in JSON input.");
+                }
+                object.add(childName, read(in));
+            }
+            in.endObject();
+            return object;
+        case END_DOCUMENT:
+        case NAME:
+        case END_OBJECT:
+        case END_ARRAY:
+        default:
+            throw new IllegalArgumentException();
+        }
+    }
+}