resourceinputstreamfactory.java

Java的面向对象数据库系统的源代码

// You can redistribute this software and/or modify it under the terms of
// the Ozone Library License version 1 published by ozone-db.org.
//
// The original code and portions created by SMB are
// Copyright (C) 1997-@year@ by SMB GmbH. All rights reserved.
//
// $Id: ResourceInputStreamFactory.java,v 1.2 2003/11/07 21:34:22 per_nyfelt Exp $
package org.ozoneDB.tools.OPP.srcgen.streamfactory;

import org.ozoneDB.tools.OPP.OPPHelper;

import java.io.InputStream;
import java.io.IOException;

/**
 *
 * @author Joakim Ohlrogge
 */
public class ResourceInputStreamFactory implements InputStreamFactory {
    private String root;
    private String extension;


    public ResourceInputStreamFactory(String extension) {
        this("/", extension);
    }

    public ResourceInputStreamFactory(String root, String extension) {
        this.root = root;
        this.extension = extension;
        if (!root.endsWith("/"))
            root += "/";
    }

    public InputStream newInstance(String className) throws IOException {
        String name = root + OPPHelper.classFileBasename(className, '/') + "." + extension;
        InputStream is = getClass().getResourceAsStream(name);

        if (is == null) {
            throw new IOException("Resource \"" + name + "\" was not found!");
        }
        return is;
    }
}