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/*
* 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();
}
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