001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package org.netbeans.modules.xml.text.completion;
043:
044: import java.util.Enumeration;
045:
046: import org.w3c.dom.*;
047:
048: import org.netbeans.modules.xml.api.model.*;
049:
050: /**
051: * This query always returns an empty result from all its query methods.
052: *
053: * @author Petr Kuzel
054: */
055: public class EmptyQuery implements GrammarQuery {
056:
057: /**
058: * Shared instance.
059: */
060: public static final GrammarQuery INSTANCE = new EmptyQuery();
061:
062: // inherit JavaDoc from interface description
063:
064: public Enumeration queryEntities(String prefix) {
065: return org.openide.util.Enumerations.empty();
066: }
067:
068: public Enumeration queryAttributes(HintContext ctx) {
069: return org.openide.util.Enumerations.empty();
070: }
071:
072: public Enumeration queryElements(HintContext ctx) {
073: return org.openide.util.Enumerations.empty();
074: }
075:
076: public Enumeration queryNotations(String prefix) {
077: return org.openide.util.Enumerations.empty();
078: }
079:
080: public Enumeration queryValues(HintContext ctx) {
081: return org.openide.util.Enumerations.empty();
082: }
083:
084: public boolean isAllowed(Enumeration en) {
085: return false;
086: }
087:
088: public GrammarResult queryDefault(HintContext virtualNodeCtx) {
089: return null;
090: }
091:
092: public java.awt.Component getCustomizer(HintContext ctx) {
093: return null;
094: }
095:
096: public boolean hasCustomizer(HintContext ctx) {
097: return false;
098: }
099:
100: public org.openide.nodes.Node.Property[] getProperties(
101: HintContext ctx) {
102: return null;
103: }
104:
105: }
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