activemq-cpp/src/main/decaf/io/FilterInputStream.h

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

#ifndef _DECAF_IO_FILTERINPUTSTREAM_H_
#define _DECAF_IO_FILTERINPUTSTREAM_H_

#include <decaf/io/InputStream.h>
#include <decaf/io/IOException.h>
#include <decaf/lang/exceptions/NullPointerException.h>
#include <decaf/lang/exceptions/IndexOutOfBoundsException.h>

namespace decaf{
namespace io{

    /**
     * A FilterInputStream contains some other input stream, which it uses
     * as its basic source of data, possibly transforming the data along the
     * way or providing additional functionality. The class FilterInputStream
     * itself simply overrides all methods of InputStream with versions
     * that pass all requests to the contained input stream. Subclasses of
     * FilterInputStream  may further override some of these methods and may
     * also provide additional methods and fields.
     */
    class DECAF_API FilterInputStream: public InputStream {
    protected:

        // The input stream to wrap
        InputStream* inputStream;

        // Indicates if we own the wrapped stream
        bool own;

        // Indicates that this stream was closed
        volatile bool closed;

    private:

        FilterInputStream(const FilterInputStream&);
        FilterInputStream& operator=(const FilterInputStream&);

    public:

        /**
         * Constructor to create a wrapped InputStream
         *
         * @param inputStream
         *      The stream to wrap and filter.
         * @param own
         *      Indicates if we own the stream object, defaults to false.
         */
        FilterInputStream(InputStream* inputStream, bool own = false);

        virtual ~FilterInputStream();

        /**
         * {@inheritDoc}
         */
        virtual int available() const;

        /**
         * {@inheritDoc}
         */
        virtual void close();

        /**
         * {@inheritDoc}
         */
        virtual long long skip(long long num);

        /**
         * {@inheritDoc}
         */
        virtual void mark(int readLimit);

        /**
         * {@inheritDoc}
         */
        virtual void reset();

        /**
         * {@inheritDoc}
         */
        virtual bool markSupported() const;

    protected:

        virtual int doReadByte();

        virtual int doReadArray(unsigned char* buffer, int size);

        virtual int doReadArrayBounded(unsigned char* buffer, int size, int offset, int length);

        /**
         * @return true if this stream has been closed.
         */
        virtual bool isClosed() const;

    };

}}

#endif /*_DECAF_IO_FILTERINPUTSTREAM_H_*/