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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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* 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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* The Original Software is NetBeans. The Initial Developer of the Original
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* Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
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package org.netbeans.modules.xml.xam.ui.customizer;
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import java.util.HashMap;
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import org.netbeans.modules.xml.xam.Model;
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* An abstract implementation of ExternalReferenceDecorator that provides
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* some common functionality for all concrete implementations to share.
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* @author Nathan Fiedler
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public abstract class AbstractReferenceDecorator implements
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ExternalReferenceDecorator {
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/** Set of namespace prefixes, keyed by Model instances. */
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private Map<Model, String> prefixMap;
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* Creates a new instance of AbstractReferenceDecorator.
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public AbstractReferenceDecorator() {
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prefixMap = new HashMap<Model, String>();
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* Generate a unique namespace prefix. The model is provided as a
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* means of possibly creating a prefix that reflects the model in
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* some fashion (e.g. using its namespace).
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* @param model XAM model, which may be used to generate the prefix.
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* @return unique prefix value (e.g. "ns1"); must not be null.
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protected abstract String generatePrefix(Model model);
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public String generatePrefix(ExternalReferenceNode node) {
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// It only makes sense to generate a prefix for nodes that have a
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// model, otherwise folders and non-XML files would have them.
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if (node.hasModel()) {
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// Use the model as the key, rather than the node itself, since
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// there could be multiple nodes representing a single model.
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Model model = node.getModel();
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String prefix = prefixMap.get(model);
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prefix = generatePrefix(model);
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prefixMap.put(model, prefix);