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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.
*/
/* $Id$ */
package org.apache.fop.pdf;
import java.io.IOException;
import java.io.OutputStream;
/**
* Interface used to store the bytes for a PDFStream. It's actually a generic
* cached byte array. There's a factory that returns either an
* in-memory or tempfile based implementation based on a
* cacheToFile setting.
*/
public interface StreamCache {
/**
* Get the current OutputStream. Do not store it - it may change
* from call to call.
*
* @return an output stream for this cache
* @throws IOException if there is an IO error
*/
OutputStream getOutputStream() throws IOException;
/**
* Convenience method for writing data to the stream cache.
* @param data byte array to write
* @throws IOException if there is an IO error
*/
void write(byte[] data) throws IOException;
/**
* Outputs the cached bytes to the given stream.
*
* @param out the stream to write to
* @return the number of bytes written
* @throws IOException if there is an IO error
*/
int outputContents(OutputStream out) throws IOException;
/**
* Returns the current size of the stream.
*
* @return the size of the cache
* @throws IOException if there is an IO error
*/
int getSize() throws IOException;
/**
* Clears and resets the cache.
*
* @throws IOException if there is an IO error
*/
void clear() throws IOException;
}
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