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/*********************************************************************
* Copyright (c) 2010 Sony Ericsson/ST Ericsson 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
*
* Contributors:
* Sony Ericsson/ST Ericsson - initial API and implementation
* Tasktop Technologies - improvements
* Jan Lohre (SAP) - improvements
*********************************************************************/
package org.eclipse.mylyn.internal.gerrit.core.client;
import java.lang.reflect.Type;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.eclipse.jgit.diff.Edit;
import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gwtjsonrpc.client.impl.ser.JavaSqlTimestamp_JsonSerializer;
import com.google.gwtjsonrpc.server.JsonServlet;
/**
* @author Steffen Pingel
*/
public class JSonSupport {
/**
* Parses a Json response.
*/
private class JSonResponseDeserializer implements JsonDeserializer<JSonResponse> {
public JSonResponse deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
JsonObject object = json.getAsJsonObject();
JSonResponse response = new JSonResponse();
response.jsonrpc = object.get("jsonrpc").getAsString(); //$NON-NLS-1$
response.id = object.get("id").getAsInt(); //$NON-NLS-1$
response.result = object.get("result"); //$NON-NLS-1$
response.error = object.get("error"); //$NON-NLS-1$
return response;
}
}
static class JSonError {
int code;
String message;
}
static class JsonRequest {
int id;
final String jsonrpc = "2.0"; //$NON-NLS-1$
String method;
final List<Object> params = new ArrayList<Object>();
String xsrfKey;
}
static class JSonResponse {
JsonElement error;
int id;
String jsonrpc;
JsonElement result;
}
private Gson gson;
public JSonSupport() {
ExclusionStrategy exclustionStrategy = new ExclusionStrategy() {
public boolean shouldSkipField(FieldAttributes f) {
// commentLinks requires instantiation of com.google.gwtexpui.safehtml.client.RegexFindReplace which is not on classpath
if (f.getDeclaredClass() == List.class && f.getName().equals("commentLinks")) { //$NON-NLS-1$
return true;
}
return false;
}
public boolean shouldSkipClass(Class<?> clazz) {
return false;
}
};
gson = JsonServlet.defaultGsonBuilder()
.registerTypeAdapter(JSonResponse.class, new JSonResponseDeserializer())
.registerTypeAdapter(Edit.class, new JsonDeserializer<Edit>() {
public Edit deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
if (json.isJsonArray()) {
JsonArray array = json.getAsJsonArray();
if (array.size() == 4) {
return new Edit(array.get(0).getAsInt(), array.get(1).getAsInt(), array.get(2)
.getAsInt(), array.get(3).getAsInt());
}
}
return new Edit(0, 0);
}
})
.registerTypeAdapter(Timestamp.class, new JsonDeserializer<Timestamp>() {
@Override
public Timestamp deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
return new JavaSqlTimestamp_JsonSerializer().fromJson(json.getAsString());
}
})
.setExclusionStrategies(exclustionStrategy)
.create();
}
public Gson getGson() {
return gson;
}
String createRequest(int id, String xsrfKey, String methodName, Collection<Object> args) {
JsonRequest msg = new JsonRequest();
msg.method = methodName;
if (args != null) {
for (Object arg : args) {
msg.params.add(arg);
}
}
msg.id = id;
msg.xsrfKey = xsrfKey;
return gson.toJson(msg, msg.getClass());
}
<T> T parseResponse(String responseMessage, Type resultType) throws GerritException {
JSonResponse response = gson.fromJson(responseMessage, JSonResponse.class);
if (response.error != null) {
JSonError error = gson.fromJson(response.error, JSonError.class);
throw new GerritException(error.message, error.code);
} else {
return gson.fromJson(response.result, resultType);
}
}
}
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