io.flutter.utils.JsonUtils.java Source code

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Here is the source code for io.flutter.utils.JsonUtils.java

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/*
 * Copyright 2017 The Chromium Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
package io.flutter.utils;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class JsonUtils {

    private JsonUtils() {
    }

    @Nullable
    public static String getStringMember(@NotNull JsonObject json, @NotNull String memberName) {
        if (!json.has(memberName))
            return null;

        final JsonElement value = json.get(memberName);
        return value instanceof JsonNull ? null : value.getAsString();
    }

    public static int getIntMember(@NotNull JsonObject json, @NotNull String memberName) {
        if (!json.has(memberName))
            return -1;

        final JsonElement value = json.get(memberName);
        return value instanceof JsonNull ? -1 : value.getAsInt();
    }

    @NotNull
    public static List<String> getValues(@NotNull JsonObject json, @NotNull String member) {
        if (!json.has(member)) {
            return Collections.emptyList();
        }

        final JsonArray rawValues = json.getAsJsonArray(member);
        final ArrayList<String> values = new ArrayList<>(rawValues.size());
        rawValues.forEach(element -> values.add(element.getAsString()));

        return values;
    }
}