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/*
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
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 * .
 *
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package org.apache.http.nio.util;

import java.io.IOException;

import org.apache.http.nio.ContentDecoder;

/**
 * Generic content input buffer.
 *
 * @since 4.0
 */
public interface ContentInputBuffer {

    /**
     * Reads content from the given {@link ContentDecoder} and stores it in
     * this buffer.
     *
     * @param decoder the content decoder.
     * @return number of bytes read.
     * @throws IOException in case of an I/O error.
     *
     * @deprecated (4.3) use implementation specific methods.
     */
    @Deprecated
    int consumeContent(ContentDecoder decoder) throws IOException;

    /**
     * Resets the buffer by clearing its state and stored content.
     */
    void reset();

    /**
     * Reads up to {@code len} bytes of data from this buffer into
     * an array of bytes. The exact number of bytes read depends how many bytes
     * are stored in the buffer.
     *
     * 

If {@code off} is negative, or {@code len} is negative, or * {@code off+len} is greater than the length of the array * {@code b}, this method can throw a runtime exception. The exact type * of runtime exception thrown by this method depends on implementation. * This method returns {@code -1} if the end of content stream has been * reached. * * @param b the buffer into which the data is read. * @param off the start offset in array {@code b} * at which the data is written. * @param len the maximum number of bytes to read. * @return the total number of bytes read into the buffer, or * {@code -1} if there is no more data because the end of * the stream has been reached. * @throws IOException if an I/O error occurs. */ int read(byte[] b, int off, int len) throws IOException; /** * Reads one byte from this buffer. If the buffer is empty this method can * throw a runtime exception. The exact type of runtime exception thrown * by this method depends on implementation. This method returns * {@code -1} if the end of content stream has been reached. * * @return one byte */ int read() throws IOException; }





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