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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common
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* Development and Distribution License("CDDL") (collectively, the
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* "License"). You may not use this file except in compliance with the
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* License. You can obtain a copy of the License at
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* http://www.netbeans.org/cddl-gplv2.html
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* or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
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* specific language governing permissions and limitations under the
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* License. When distributing the software, include this License Header
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* Notice in each file and include the License file at
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* nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the GPL Version 2 section of the License file that
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* accompanied this code. If applicable, add the following below the
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* License Header, with the fields enclosed by brackets [] replaced by
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* your own identifying information:
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* "Portions Copyrighted [year] [name of copyright owner]"
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* The Original Software is NetBeans. The Initial Developer of the Original
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* Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
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* Microsystems, Inc. All Rights Reserved.
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* If you wish your version of this file to be governed by only the CDDL
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* or only the GPL Version 2, indicate your decision by adding
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* "[Contributor] elects to include this software in this distribution
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* under the [CDDL or GPL Version 2] license." If you do not indicate a
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* single choice of license, a recipient has the option to distribute
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* your version of this file under either the CDDL, the GPL Version 2 or
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* to extend the choice of license to its licensees as provided above.
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* However, if you add GPL Version 2 code and therefore, elected the GPL
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* Version 2 license, then the option applies only if the new code is
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* made subject to such option by the copyright holder.
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package org.openide.xml;
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import org.openide.util.*;
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import javax.swing.event.*;
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* Entity resolver resolving all entities registered by modules.
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* Use {@link #getDefault} to get the master instance in system. Any parser working with
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* unknown XML documents should use it to avoid unnecessary Internet
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* <p>You can register your own instances via lookup to add to the resolver pool,
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* for example using an XML file in the format defined by {@link #PUBLIC_ID},
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* but for reasons of performance and predictability during startup it is best to provide
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* the entity (e.g. some DTD you define) as the contents of a file in
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* the system filesystem, in the <samp>/xml/entities/</samp> folder, where the file path
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* beneath this folder is based on the public ID as follows:
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* <li>US-ASCII alphanumeric characters and '_' are left as is.
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* <li>Spaces and various punctuation are converted to '_' (one per character).
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* <li>Initial '-//' is dropped.
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* <li>Final '//EN' is dropped.
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* <li>Exactly two forward slashes in a row are converted to one.
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* Thus for example the public ID <samp>-//NetBeans//Entity Mapping Registration 1.0//EN</samp>
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* would be looked for in the file <samp>/xml/entities/NetBeans/Entity_Mapping_Registration_1_0</samp>.
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* Naturally this only works if you are defining a fixed number of entities.
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* <p>It is recommended that the entity file in <samp>/xml/entities/</samp> also be given a file
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* attribute named <code>hint.originalPublicID</code> with a string value giving the public ID.
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public abstract class EntityCatalog implements EntityResolver {
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* DOCTYPE public ID defining grammar used for entity registrations.
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public static final String PUBLIC_ID = "-//NetBeans//Entity Mapping Registration 1.0//EN"; // NOI18N
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private static EntityCatalog instance = new Forwarder();
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/** Get a master entity catalog which can delegate to any others that have
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* been registered via lookup.
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public static EntityCatalog getDefault() {
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* This catalog is forwarding implementation.
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private static class Forwarder extends EntityCatalog {
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private Lookup.Result<EntityCatalog> result;
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public InputSource resolveEntity(String publicID, String systemID)
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throws IOException, SAXException {
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if (result == null) {
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Lookup.Template<EntityCatalog> temp = new Lookup.Template<EntityCatalog>(EntityCatalog.class);
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result = Lookup.getDefault().lookup(temp);
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for (EntityCatalog res : result.allInstances()) {
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// using resolver's method because EntityCatalog extends EntityResolver
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InputSource is = res.resolveEntity(publicID, systemID);