| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Copyright 2001-2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * $Id: Pattern.java,v 1.2.4.1 2005/09/12 11:00:31 pvedula Exp $ |
| */ |
| |
| package com.sun.org.apache.xalan.internal.xsltc.compiler; |
| |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| */ |
| public abstract class Pattern extends Expression { |
| /** |
| * Returns the type of a pattern, which is always a <code>NodeType</code>. |
| * A <code>NodeType</code> has a number of subtypes defined by |
| * <code>NodeType._type</code> corresponding to each type of node. |
| */ |
| public abstract Type typeCheck(SymbolTable stable) throws TypeCheckError; |
| |
| /** |
| * Translate this node into JVM bytecodes. Patterns are translated as |
| * boolean expressions with true/false lists. Before calling |
| * <code>translate</code> on a pattern, make sure that the node being |
| * matched is on top of the stack. After calling <code>translate</code>, |
| * make sure to backpatch both true and false lists. True lists are the |
| * default, in the sense that they always <em>"fall through"</em>. If this |
| * is not the intended semantics (e.g., see |
| * {@link com.sun.org.apache.xalan.internal.xsltc.compiler.AlternativePattern#translate}) |
| * then a GOTO must be appended to the instruction list after calling |
| * <code>translate</code>. |
| */ |
| public abstract void translate(ClassGenerator classGen, |
| MethodGenerator methodGen); |
| |
| /** |
| * Returns the priority of this pattern (section 5.5 in the XSLT spec). |
| */ |
| public abstract double getPriority(); |
| } |