Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (c) 2014-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

import org.json.JSONArray;
import org.json.JSONException;
import javax.annotation.Nullable;

import java.util.HashSet;

import java.util.Set;

public class Main {
    @Nullable
    public static Object valueFromString(String newValue, Object existingValue) throws IllegalArgumentException {
        if (existingValue instanceof Integer) {
            return Integer.parseInt(newValue);
        } else if (existingValue instanceof Long) {
            return Long.parseLong(newValue);
        } else if (existingValue instanceof Float) {
            return Float.parseFloat(newValue);
        } else if (existingValue instanceof Boolean) {
            return parseBoolean(newValue);
        } else if (existingValue instanceof String) {
            return newValue;
        } else if (existingValue instanceof Set) {
            try {
                JSONArray obj = new JSONArray(newValue);
                int objN = obj.length();
                HashSet<String> set = new HashSet<String>(objN);
                for (int i = 0; i < objN; i++) {
                    set.add(obj.getString(i));
                }
                return set;
            } catch (JSONException e) {
                throw new IllegalArgumentException(e);
            }
        } else {
            throw new IllegalArgumentException("Unsupported type: " + existingValue.getClass().getName());
        }
    }

    private static Boolean parseBoolean(String s) throws IllegalArgumentException {
        if ("1".equals(s) || "true".equalsIgnoreCase(s)) {
            return Boolean.TRUE;
        } else if ("0".equals(s) || "false".equalsIgnoreCase(s)) {
            return Boolean.FALSE;
        }
        throw new IllegalArgumentException("Expected boolean, got " + s);
    }
}