using Lucene.Net.Analysis.Util;
using System;
using System.IO;
using System.Text;

namespace Lucene.Net.Analysis.Ja
{
    /*
     * Licensed to the Apache Software Foundation (ASF) under one or more
     * contributor license agreements.  See the NOTICE file distributed with
     * this work for additional information regarding copyright ownership.
     * The ASF 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.
     */

    /// <summary>Fake resource loader for tests: works if you want to fake reading a single file</summary>
    internal class StringMockResourceLoader : IResourceLoader
    {
        String text;

        public StringMockResourceLoader(String text)
        {
            this.text = text;
        }

        public virtual Type FindType(String cname)
        {
            try
            {
                //return Class.forName(cname).asSubclass(expectedType);
                return Type.GetType(cname);
            }
            catch (Exception e)
            {
                throw new Exception("Cannot load class: " + cname, e);
            }
        }

        public virtual T NewInstance<T>(String cname)
        {
            Type clazz = FindType(cname);
            try
            {
                //return clazz.NewInstance();
                return (T)Activator.CreateInstance(clazz);
            }
            catch (Exception e)
            {
                throw new Exception("Cannot create instance: " + cname, e);
            }
        }

        public virtual Stream OpenResource(String resource)
        {
            return new MemoryStream(Encoding.UTF8.GetBytes(text));
        }
    }
}
