Here you can find the source of toBufferedInputStream(InputStream inputStream)
public static final InputStream toBufferedInputStream(InputStream inputStream) throws IOException
//package com.java2s; /*/* www . jav a 2 s. c om*/ * Copyright 2004-2007 the Seasar Foundation and the Others. * * 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. */ import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; public class Main { public static final InputStream toBufferedInputStream(InputStream inputStream) throws IOException { if (!(inputStream instanceof BufferedInputStream)) { inputStream = new BufferedInputStream(inputStream); } return inputStream; } }