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/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * 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.spf4j.io;

import com.google.common.io.BaseEncoding;
import edu.umd.cs.findbugs.annotations.CleanupObligation;
import java.io.IOException;
import java.io.InputStream;


/**
 * a extended implementation that improves the safety of unread and provides a better toString.
 * @author zoly
 */
@CleanupObligation
public final class PushbackInputStreamEx  extends java.io.PushbackInputStream {

    public PushbackInputStreamEx(final InputStream in, final int size) {
        super(in, size);
    }

    public PushbackInputStreamEx(final InputStream in) {
        super(in);
    }

    @Override
    public String toString() {
        return "PushbackInputStream{"
                + ((buf == null) ? "buf=null" : "buf=" + BaseEncoding.base64().encode(buf))
                + ", pos=" + pos
                + ", wrapped=" + this.in + '}';
    }

    public InputStream getUnderlyingStream() {
        return this.in;
    }

  @Override
  public void unread(final int b) throws IOException {
    if (b < 0) {
      throw new IllegalArgumentException("Unread int must be positive and not " + b);
    }
    super.unread(b);
  }




}