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Java > Open Source Codes > org > netbeans > api > mdr > DTDProducer


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19 package org.netbeans.api.mdr;
20
21 import java.io.OutputStream JavaDoc;
22 import javax.jmi.reflect.RefPackage;
23 import org.openide.util.Lookup;
24 import java.util.Collection JavaDoc;
25
26 /** DTD generation utility. Provides a way to generate
27  * DTDs for a given metamodel. Use {@link #getDefault} method to get the default instance.
28  *
29  * @author Martin Matula
30  */
31 public abstract class DTDProducer {
32     /** Generates a DTD for a given extent into a provided output stream.
33      * @param stream Output stream to generate the DTD into.
34      * @param extent Extent that the DTD should be generated from.
35      */
36     public abstract void generate(OutputStream JavaDoc stream, RefPackage extent);
37     
38     /** Returns a default DTDProducer instance.
39      * @return Default DTD producer.
40      */
41     public static DTDProducer getDefault() {
42         // [PENDING] simple lookup should be used once the lookup is fixed (currently it does not preserve order)
43 Lookup.Result result = Lookup.getDefault().lookup(
44             new Lookup.Template(DTDProducer.class)
45         );
46         Collection JavaDoc instances = result.allInstances();
47         return (instances.size() > 0 ? (DTDProducer) result.allInstances().iterator().next() : null);
48     }
49 }
50
51
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