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Jave Web Validator Framework

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/*
 * Copyright 2016-2017, Youqian Yue ([email protected]).
 *
 * 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.
 */

package org.devefx.validator.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

public class StreamUtils {

    public static final int BUFFER_SIZE = 4096;
    
    /**
     * Copy the contents of the given InputStream into a String.
     * Leaves the stream open when done.
     * @param in the InputStream to copy from
     * @return the String that has been copied to
     * @throws IOException in case of I/O errors
     */
    public static String copyToString(InputStream in, Charset charset) throws IOException {
        Assert.notNull(in, "No InputStream specified");
        StringBuilder out = new StringBuilder();
        InputStreamReader reader = new InputStreamReader(in, charset);
        char[] buffer = new char[BUFFER_SIZE];
        int bytesRead = -1;
        while ((bytesRead = reader.read(buffer)) != -1) {
            out.append(buffer, 0, bytesRead);
        }
        return out.toString();
    }
}