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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.olingo.odata2.core.ep.util;
import java.io.IOException;
import org.apache.olingo.odata2.api.ep.EntityProviderException;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
public class JsonUtils {
public static String createODataContextValueForTombstone(final String entitySetName) {
return FormatJson.DELTA_CONTEXT_PREFIX + entitySetName + FormatJson.DELTA_CONTEXT_POSTFIX;
}
public static int startJson(final JsonReader reader) throws EntityProviderException {
// The enclosing "d" and "results" are optional - so we cannot check for the presence
// but we have to read over them in case they are present.
JsonToken token;
try {
token = reader.peek();
int openJsonObjects = 0;
if (JsonToken.BEGIN_OBJECT == token) {
reader.beginObject();
openJsonObjects++;
token = reader.peek();
if (JsonToken.NAME == token) {
String name = reader.nextName();
if (!("d".equals(name) ^ "results".equals(name))) {
// TODO I18N
throw new EntityProviderException(EntityProviderException.COMMON, name +
" not expected, only d or results");
}
}
token = reader.peek();
if (JsonToken.BEGIN_OBJECT == token) {
reader.beginObject();
openJsonObjects++;
} else if (JsonToken.BEGIN_ARRAY == token) {
// TODO I18N
throw new EntityProviderException(EntityProviderException.COMMON, "Array not expected");
}
}
return openJsonObjects;
} catch (IOException e) {
// TODO I18N
throw new EntityProviderException(EntityProviderException.COMMON, e);
}
}
public static boolean endJson(final JsonReader reader, final int openJsonObjects) throws IOException,
EntityProviderException {
for (int closedJsonObjects = 0; closedJsonObjects < openJsonObjects; closedJsonObjects++) {
reader.endObject();
}
return reader.peek() == JsonToken.END_DOCUMENT;
}
}