/*

 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.imageio.spi;

import java.io.File;

import java.io.InputStream;

import java.io.IOException;

import java.util.Locale;

import javax.imageio.spi.ImageInputStreamSpi;

import javax.imageio.stream.ImageInputStream;

import javax.imageio.stream.FileCacheImageInputStream;

import javax.imageio.stream.MemoryCacheImageInputStream;

public class InputStreamImageInputStreamSpi extends ImageInputStreamSpi {

    private static final String vendorName = "Oracle Corporation";

    private static final String version = "1.0";

    private static final Class inputClass = InputStream.class;

    public InputStreamImageInputStreamSpi() {

        super(vendorName, version, inputClass);

    }

    public String getDescription(Locale locale) {

        return "Service provider that instantiates a FileCacheImageInputStream or MemoryCacheImageInputStream from an InputStream";

    }

    public boolean canUseCacheFile() {

        return true;

    }

    public boolean needsCacheFile() {

        return false;

    }

    public ImageInputStream createInputStreamInstance(Object input,

                                                      boolean useCache,

                                                      File cacheDir)

        throws IOException {

        if (input instanceof InputStream) {

            InputStream is = (InputStream)input;

            if (useCache) {

                return new FileCacheImageInputStream(is, cacheDir);

            } else {

                return new MemoryCacheImageInputStream(is);

            }

        } else {

            throw new IllegalArgumentException();

        }

    }

}