/*
 *  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.
 */
/**
 * @author Rustem V. Rafikov
 */
package com.google.code.appengine.imageio.spi;

import java.io.File;
import java.io.IOException;

import com.google.code.appengine.imageio.spi.IIOServiceProvider;
import com.google.code.appengine.imageio.spi.RegisterableService;
import com.google.code.appengine.imageio.stream.ImageInputStream;



public abstract class ImageInputStreamSpi extends IIOServiceProvider implements
        RegisterableService {
    protected Class<?> inputClass;

    protected ImageInputStreamSpi() {
        // the default impl. does nothing
    }

    public ImageInputStreamSpi(String vendorName, String version, Class<?> inputClass) {
        super(vendorName, version);
        this.inputClass = inputClass;
    }

    public Class<?> getInputClass() {
        return inputClass;
    }

    public boolean canUseCacheFile() {
        return false; //-- def
    }

    public boolean needsCacheFile() {
        return false; // def
    }

    public abstract ImageInputStream createInputStreamInstance(Object input, boolean useCache,
            File cacheDir) throws IOException;

    public ImageInputStream createInputStreamInstance(Object input) throws IOException {
        return createInputStreamInstance(input, true, null);
    }
}