001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 /*
019 * $Id: LocationPathPattern.java 468650 2006-10-28 07:03:30Z minchau $
020 */
021
022 package org.apache.xalan.xsltc.compiler;
023
024 import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
025 import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
026 import org.apache.xalan.xsltc.compiler.util.Type;
027 import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
028 import org.apache.xml.dtm.Axis;
029
030 /**
031 * @author Jacek Ambroziak
032 * @author Santiago Pericas-Geertsen
033 * @author Morten Jorgensen
034 */
035 public abstract class LocationPathPattern extends Pattern {
036 private Template _template;
037 private int _importPrecedence;
038 private double _priority = Double.NaN;
039 private int _position = 0;
040
041 public Type typeCheck(SymbolTable stable) throws TypeCheckError {
042 return Type.Void; // TODO
043 }
044
045 public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
046 // TODO: What does it mean to translate a Pattern ?
047 }
048
049 public void setTemplate(final Template template) {
050 _template = template;
051 _priority = template.getPriority();
052 _importPrecedence = template.getImportPrecedence();
053 _position = template.getPosition();
054 }
055
056 public Template getTemplate() {
057 return _template;
058 }
059
060 public final double getPriority() {
061 return Double.isNaN(_priority) ? getDefaultPriority() : _priority;
062 }
063
064 public double getDefaultPriority() {
065 return 0.5;
066 }
067
068 /**
069 * This method is used by the Mode class to prioritise patterns and
070 * template. This method is called for templates that are in the same
071 * mode and that match on the same core pattern. The rules used are:
072 * o) first check precedence - highest precedence wins
073 * o) then check priority - highest priority wins
074 * o) then check the position - the template that occured last wins
075 */
076 public boolean noSmallerThan(LocationPathPattern other) {
077 if (_importPrecedence > other._importPrecedence) {
078 return true;
079 }
080 else if (_importPrecedence == other._importPrecedence) {
081 if (_priority > other._priority) {
082 return true;
083 }
084 else if (_priority == other._priority) {
085 if (_position > other._position) {
086 return true;
087 }
088 }
089 }
090 return false;
091 }
092
093 public abstract StepPattern getKernelPattern();
094
095 public abstract void reduceKernelPattern();
096
097 public abstract boolean isWildcard();
098
099 public int getAxis() {
100 final StepPattern sp = getKernelPattern();
101 return (sp != null) ? sp.getAxis() : Axis.CHILD;
102 }
103
104 public String toString() {
105 return "root()";
106 }
107 }