alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (UnresolvedRef.java)

This example Java source code file (UnresolvedRef.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

errormsg, methodgenerator, parameterref, qname, string, symboltable, typecheckerror, unresolvedref, variablebase, variablerefbase

The UnresolvedRef.java Java example source code

/*
 * 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: UnresolvedRef.java,v 1.5 2005/09/28 13:48:17 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.ErrorMsg;
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 Morten Jorgensen
 */
final class UnresolvedRef extends VariableRefBase {

    private QName _variableName = null;
    private VariableRefBase _ref = null;

    public UnresolvedRef(QName name) {
        super();
        _variableName = name;
    }

    public QName getName() {
        return(_variableName);
    }

    private ErrorMsg reportError() {
        ErrorMsg err = new ErrorMsg(ErrorMsg.VARIABLE_UNDEF_ERR,
                                    _variableName, this);
        getParser().reportError(Constants.ERROR, err);
        return(err);
    }

    private VariableRefBase resolve(Parser parser, SymbolTable stable) {
        // At this point the AST is already built and we should be able to
        // find any declared global variable or parameter
        VariableBase ref = parser.lookupVariable(_variableName);
        if (ref == null) {
            ref = (VariableBase)stable.lookupName(_variableName);
        }
        if (ref == null) {
            reportError();
            return null;
        }

        // If in a top-level element, create dependency to the referenced var
        _variable = ref;
        addParentDependency();

        if (ref instanceof Variable) {
            return new VariableRef((Variable) ref);
        }
        else if (ref instanceof Param) {
            return new ParameterRef((Param)ref);
        }
        return null;
    }

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
        if (_ref != null) {
            final String name = _variableName.toString();
            ErrorMsg err = new ErrorMsg(ErrorMsg.CIRCULAR_VARIABLE_ERR,
                                        name, this);
        }
        if ((_ref = resolve(getParser(), stable)) != null) {
            return (_type = _ref.typeCheck(stable));
        }
        throw new TypeCheckError(reportError());
    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
        if (_ref != null)
            _ref.translate(classGen, methodGen);
        else
            reportError();
    }

    public String toString() {
        return "unresolved-ref()";
    }

}

Other Java examples (source code examples)

Here is a short list of links related to this Java UnresolvedRef.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.