com.sun.tools.rngom.digested.DPattern Maven / Gradle / Ivy
/*
* Copyright (C) 2004-2012
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* THE SOFTWARE.
*/
package com.sun.tools.rngom.digested;
import com.sun.tools.rngom.ast.om.ParsedPattern;
import com.sun.tools.rngom.parse.Parseable;
import org.xml.sax.Locator;
/**
* Base class of all the patterns.
*
* @author Kohsuke Kawaguchi ([email protected])
*/
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 accept(DPatternVisitor 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;
}
}