| /* |
| * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package com.sun.xml.internal.rngom.digested; |
| |
| import com.sun.xml.internal.rngom.ast.om.ParsedPattern; |
| import com.sun.xml.internal.rngom.parse.Parseable; |
| import org.xml.sax.Locator; |
| |
| /** |
| * Base class of all the patterns. |
| * |
| * @author Kohsuke Kawaguchi (kk@kohsuke.org) |
| */ |
| public abstract class DPattern implements ParsedPattern { |
| Locator location; |
| DAnnotation annotation; |
| |
| /** |
| * Used to chain the child patterns in a doubly-linked list. |
| */ |
| DPattern next; |
| DPattern prev; |
| |
| /** |
| * Returns where the pattern is defined in the source code. |
| */ |
| public Locator getLocation() { |
| return location; |
| } |
| |
| /** |
| * Returns the annotation associated with it. |
| * |
| * @return |
| * may be empty, but never be null. |
| */ |
| public DAnnotation getAnnotation() { |
| if(annotation==null) |
| return DAnnotation.EMPTY; |
| return annotation; |
| } |
| |
| /** |
| * Returns true if this pattern is nullable. |
| * |
| * A nullable pattern is a pattern that can match the empty sequence. |
| */ |
| public abstract boolean isNullable(); |
| |
| public abstract <V> V accept( DPatternVisitor<V> visitor ); |
| |
| /** |
| * Creates a {@link Parseable} object that reparses this pattern. |
| */ |
| public Parseable createParseable() { |
| return new PatternParseable(this); |
| } |
| |
| /** |
| * Returns true if this is {@link DElementPattern}. |
| */ |
| public final boolean isElement() { |
| return this instanceof DElementPattern; |
| } |
| |
| /** |
| * Returns true if this is {@link DAttributePattern}. |
| */ |
| public final boolean isAttribute() { |
| return this instanceof DAttributePattern; |
| } |
| } |