org.openqa.selenium.json.Json.java Source code

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Here is the source code for org.openqa.selenium.json.Json.java

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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.openqa.selenium.json;

import com.google.common.io.CharStreams;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;

import java.io.IOException;
import java.io.Reader;
import java.io.UncheckedIOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;

public class Json {
    final static Gson GSON = new GsonBuilder().registerTypeAdapterFactory(ListAdapter.FACTORY)
            .registerTypeAdapterFactory(MapAdapter.FACTORY).setLenient().serializeNulls().create();

    public static final Type MAP_TYPE = new TypeToken<Map<String, Object>>() {
    }.getType();
    public static final Type OBJECT_TYPE = new TypeToken<Object>() {
    }.getType();

    private final JsonToBeanConverter toBean = new JsonToBeanConverter();
    private final BeanToJsonConverter toJson = new BeanToJsonConverter();

    public String toJson(Object toConvert) {
        return toJson.convert(toConvert);
    }

    public JsonElement toJsonElement(Object toConvert) {
        return toJson.convertObject(toConvert);
    }

    public <T> T toType(Object source, Class<T> typeOfT) {
        return toBean.convert(typeOfT, source);
    }

    public <T> T toType(Object source, Type typeOfT) {
        Class<?> type;
        if (typeOfT instanceof ParameterizedType) {
            type = (Class<?>) ((ParameterizedType) typeOfT).getRawType();
        } else if (typeOfT instanceof Class) {
            type = (Class<?>) typeOfT;
        } else {
            throw new IllegalArgumentException("Unable to convert type: " + typeOfT);
        }
        return (T) toBean.convert(type, source);
    }

    private static Object readValue(JsonReader in, Gson gson) throws IOException {
        switch (in.peek()) {
        case BEGIN_ARRAY:
            return gson.fromJson(in, List.class);

        case BEGIN_OBJECT:
            return gson.fromJson(in, Map.class);

        case BOOLEAN:
        case NULL:
        case STRING:
            return gson.fromJson(in, Object.class);

        case NUMBER:
            String number = in.nextString();
            if (number.indexOf('.') != -1) {
                return Double.parseDouble(number);
            }
            return Long.parseLong(number);

        default:
            throw new JsonParseException("Unexpected type: " + in.peek());
        }
    }

    public JsonInput newInput(Reader from) throws UncheckedIOException {
        return new JsonInput(GSON, GSON.newJsonReader(from));
    }

    public JsonOutput newOutput(Appendable to) throws UncheckedIOException {
        try {
            return new JsonOutput(toJson, GSON.newJsonWriter(CharStreams.asWriter(to)));
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    private static class MapAdapter extends TypeAdapter<Map<?, ?>> {

        private final static TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
            @SuppressWarnings("unchecked")
            @Override
            public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
                if (type.getRawType() == Map.class) {
                    return (TypeAdapter<T>) new MapAdapter(gson);
                }
                return null;
            }
        };

        private final Gson gson;

        private MapAdapter(Gson gson) {
            this.gson = Objects.requireNonNull(gson);
        }

        @Override
        public Map<?, ?> read(JsonReader in) throws IOException {
            if (in.peek() == JsonToken.NULL) {
                in.nextNull();
                return null;
            }

            Map<String, Object> map = new TreeMap<>();
            in.beginObject();

            while (in.hasNext()) {
                String key = in.nextName();
                Object value = readValue(in, gson);

                map.put(key, value);
            }

            in.endObject();
            return map;
        }

        @Override
        public void write(JsonWriter out, Map<?, ?> value) throws IOException {
            // It's fine to use GSON's own default writer for this.
            out.beginObject();
            for (Map.Entry<?, ?> entry : value.entrySet()) {
                out.name(String.valueOf(entry.getKey()));
                @SuppressWarnings("unchecked")
                TypeAdapter<Object> adapter = (TypeAdapter<Object>) gson.getAdapter(entry.getValue().getClass());
                adapter.write(out, entry.getValue());
            }
            out.endObject();
        }
    }

    private static class ListAdapter extends TypeAdapter<List<?>> {

        private final static TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
            @SuppressWarnings("unchecked")
            @Override
            public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
                if (type.getRawType() == List.class) {
                    return (TypeAdapter<T>) new ListAdapter(gson);
                }
                return null;
            }
        };

        private final Gson gson;

        private ListAdapter(Gson gson) {
            this.gson = Objects.requireNonNull(gson);
        }

        @Override
        public List<?> read(JsonReader in) throws IOException {
            if (in.peek() == JsonToken.NULL) {
                in.nextNull();
                return null;
            }

            List<Object> list = new LinkedList<>();
            in.beginArray();

            while (in.hasNext()) {
                list.add(readValue(in, gson));
            }

            in.endArray();
            return list;
        }

        @Override
        public void write(JsonWriter out, List<?> value) throws IOException {
            out.beginArray();
            for (Object entry : value) {
                @SuppressWarnings("unchecked")
                TypeAdapter<Object> adapter = (TypeAdapter<Object>) gson.getAdapter(entry.getClass());
                adapter.write(out, entry);
            }
            out.endArray();
        }
    }
}