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Java example source code file (UnaryOpExpr.java)

This example Java source code file (UnaryOpExpr.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

castexpr, expression, instructionlist, methodgenerator, methodtype, string, type, typecheckerror, unaryopexpr

The UnaryOpExpr.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: UnaryOpExpr.java,v 1.2.4.1 2005/09/05 09:21:00 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler;

import com.sun.org.apache.bcel.internal.generic.InstructionList;
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.MethodType;
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
 */
final class UnaryOpExpr extends Expression {
    private Expression _left;

    public UnaryOpExpr(Expression left) {
        (_left = left).setParent(this);
    }

    /**
     * Returns true if this expressions contains a call to position(). This is
     * needed for context changes in node steps containing multiple predicates.
     */
    public boolean hasPositionCall() {
        return(_left.hasPositionCall());
    }

    /**
     * Returns true if this expressions contains a call to last()
     */
    public boolean hasLastCall() {
            return(_left.hasLastCall());
    }

    public void setParser(Parser parser) {
        super.setParser(parser);
        _left.setParser(parser);
    }

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
        final Type tleft = _left.typeCheck(stable);
        final MethodType ptype = lookupPrimop(stable, "u-",
                                              new MethodType(Type.Void,
                                                             tleft));

        if (ptype != null) {
            final Type arg1 = (Type) ptype.argsType().elementAt(0);
            if (!arg1.identicalTo(tleft)) {
                _left = new CastExpr(_left, arg1);
            }
            return _type = ptype.resultType();
        }

        throw new TypeCheckError(this);
    }

    public String toString() {
        return "u-" + '(' + _left + ')';
    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
        InstructionList il = methodGen.getInstructionList();
        _left.translate(classGen, methodGen);
        il.append(_type.NEG());
    }
}

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