// Copyright (C) 2009 The Android Open Source Project
//
// Licensed 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.eclipse.jgit.diff;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
public class EditDeserializer implements JsonDeserializer<Edit>,
JsonSerializer<Edit> {
public Edit deserialize(final JsonElement json, final Type typeOfT,
final JsonDeserializationContext context) throws JsonParseException {
if (json.isJsonNull()) {
return null;
}
if (!json.isJsonArray()) {
throw new JsonParseException("Expected array for Edit type");
}
final JsonArray o = (JsonArray) json;
final int cnt = o.size();
if (cnt < 4 || cnt % 4 != 0) {
throw new JsonParseException("Expected array of 4 for Edit type");
}
if (4 == cnt) {
return new Edit(get(o, 0), get(o, 1), get(o, 2), get(o, 3));
}
List<Edit> l = new ArrayList<Edit>((cnt / 4) - 1);
for (int i = 4; i < cnt;) {
int as = get(o, i++);
int ae = get(o, i++);
int bs = get(o, i++);
int be = get(o, i++);
l.add(new Edit(as, ae, bs, be));
}
return new ReplaceEdit(get(o, 0), get(o, 1), get(o, 2), get(o, 3), l);
}
private static int get(final JsonArray a, final int idx)
throws JsonParseException {
final JsonElement v = a.get(idx);
if (!v.isJsonPrimitive()) {
throw new JsonParseException("Expected array of 4 for Edit type");
}
final JsonPrimitive p = (JsonPrimitive) v;
if (!p.isNumber()) {
throw new JsonParseException("Expected array of 4 for Edit type");
}
return p.getAsInt();
}
public JsonElement serialize(final Edit src, final Type typeOfSrc,
final JsonSerializationContext context) {
if (src == null) {
return JsonNull.INSTANCE;
}
final JsonArray a = new JsonArray();
add(a, src);
if (src instanceof ReplaceEdit) {
for (Edit e : ((ReplaceEdit) src).getInternalEdits()) {
add(a, e);
}
}
return a;
}
private void add(final JsonArray a, final Edit src) {
a.add(new JsonPrimitive(src.getBeginA()));
a.add(new JsonPrimitive(src.getEndA()));
a.add(new JsonPrimitive(src.getBeginB()));
a.add(new JsonPrimitive(src.getEndB()));
}
}