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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.

package org.openqa.selenium.remote.server;

import com.google.common.base.Preconditions;

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

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;


class InputStreamWrappingServletInputStream extends ServletInputStream {

  private final InputStream delegate;
  private int lastRead;

  public InputStreamWrappingServletInputStream(InputStream delegate) {
    this.delegate = Preconditions.checkNotNull(delegate);

  }

  @Override
  public int available() throws IOException {
    return delegate.available();
  }

  @Override
  public void close() throws IOException {
    delegate.close();
    lastRead = -1;
  }

  @Override
  public boolean isFinished() {
    return lastRead != -1;
  }

  @Override
  public boolean isReady() {
    return !isFinished();
  }

  @Override
  public void setReadListener(ReadListener readListener) {
    throw new UnsupportedOperationException("setReadListener");
  }

  @Override
  public int read() throws IOException {
    lastRead = delegate.read();
    return lastRead;
  }

  @Override
  public boolean markSupported() {
    return false;
  }
}