StreamUtils.java

/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.xml.internal.ws.util;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author Jitendra Kotamraju
 */
public class StreamUtils {

    /*
     * Finds if the stream has some content or not
     *
     * @return null if there is no data
     *         else stream to be used
     */
    public static InputStream hasSomeData(InputStream in) {
        if (in != null) {
            try {
                if (in.available() < 1) {
                    if (!in.markSupported()) {
                        in = new BufferedInputStream(in);
                    }
                    in.mark(1);
                    if (in.read() != -1) {
                        in.reset();
                    } else {
                        in = null;          // No data
                    }
                }
            } catch(IOException ioe) {
                in = null;
            }
        }
        return in;
    }

}