Java tutorial
/* * Copyright (C) 2015 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 com.android.ide.common.blame; import com.google.gson.JsonDeserializationContext; import com.google.gson.JsonDeserializer; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonSerializationContext; import com.google.gson.JsonSerializer; import com.google.gson.TypeAdapter; import com.google.gson.stream.JsonReader; import com.google.gson.stream.JsonWriter; import java.io.IOException; import java.lang.reflect.Type; public class SourceFilePositionJsonSerializer extends TypeAdapter<SourceFilePosition> { private static final String POSITION = "position"; private static final String FILE = "file"; private final SourceFileJsonTypeAdapter mSourceFileJsonTypeAdapter; private final SourcePositionJsonTypeAdapter mSourcePositionJsonTypeAdapter; public SourceFilePositionJsonSerializer() { mSourcePositionJsonTypeAdapter = new SourcePositionJsonTypeAdapter(); mSourceFileJsonTypeAdapter = new SourceFileJsonTypeAdapter(); } @Override public SourceFilePosition read(JsonReader in) throws IOException { in.beginObject(); SourceFile file = SourceFile.UNKNOWN; SourcePosition position = SourcePosition.UNKNOWN; while (in.hasNext()) { String name = in.nextName(); if (name.equals(FILE)) { file = mSourceFileJsonTypeAdapter.read(in); } else if (name.equals(POSITION)) { position = mSourcePositionJsonTypeAdapter.read(in); } else { in.skipValue(); } } in.endObject(); return new SourceFilePosition(file, position); } @Override public void write(JsonWriter out, SourceFilePosition src) throws IOException { out.beginObject(); SourceFile sourceFile = src.getFile(); if (!sourceFile.equals(SourceFile.UNKNOWN)) { out.name(FILE); mSourceFileJsonTypeAdapter.write(out, sourceFile); } SourcePosition position = src.getPosition(); if (!position.equals(SourcePosition.UNKNOWN)) { out.name(POSITION); mSourcePositionJsonTypeAdapter.write(out, position); } out.endObject(); } /* package */ SourcePositionJsonTypeAdapter getSourcePositionTypeAdapter() { return mSourcePositionJsonTypeAdapter; } }