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Java example source code file (FilteredAbsoluteLocationPath.java)

This example Java source code file (FilteredAbsoluteLocationPath.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, constantpoolgen, expression, filteredabsolutelocationpath, instructionlist, invokeinterface, invokespecial, localvariablegen, methodgenerator, node_iterator_sig, nodetype, string, type

The FilteredAbsoluteLocationPath.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2001-2005 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: FilteredAbsoluteLocationPath.java,v 1.2.4.1 2005/09/12 10:26:50 pvedula Exp $
 */

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

import com.sun.org.apache.bcel.internal.generic.ALOAD;
import com.sun.org.apache.bcel.internal.generic.ASTORE;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
import com.sun.org.apache.bcel.internal.generic.NEW;
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.NodeType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;

/**
 * @author G. Todd Miller
 */
final class FilteredAbsoluteLocationPath extends Expression {
    private Expression _path;   // may be null

    public FilteredAbsoluteLocationPath() {
        _path = null;
    }

    public FilteredAbsoluteLocationPath(Expression path) {
        _path = path;
        if (path != null) {
            _path.setParent(this);
        }
    }

    public void setParser(Parser parser) {
        super.setParser(parser);
        if (_path != null) {
            _path.setParser(parser);
        }
    }

    public Expression getPath() {
        return(_path);
    }

    public String toString() {
        return "FilteredAbsoluteLocationPath(" +
            (_path != null ? _path.toString() : "null") + ')';
    }

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
        if (_path != null) {
            final Type ptype = _path.typeCheck(stable);
            if (ptype instanceof NodeType) {            // promote to node-set
                _path = new CastExpr(_path, Type.NodeSet);
            }
        }
        return _type = Type.NodeSet;
    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();
        if (_path != null) {
            final int initDFI = cpg.addMethodref(DUP_FILTERED_ITERATOR,
                                                "<init>",
                                                "("
                                                + NODE_ITERATOR_SIG
                                                + ")V");

            // Backwards branches are prohibited if an uninitialized object is
            // on the stack by section 4.9.4 of the JVM Specification, 2nd Ed.
            // We don't know whether this code might contain backwards branches,
            // so we mustn't create the new object until after we've created
            // the suspect arguments to its constructor.  Instead we calculate
            // the values of the arguments to the constructor first, store them
            // in temporary variables, create the object and reload the
            // arguments from the temporaries to avoid the problem.

            // Compile relative path iterator(s)
            LocalVariableGen pathTemp =
               methodGen.addLocalVariable("filtered_absolute_location_path_tmp",
                                          Util.getJCRefType(NODE_ITERATOR_SIG),
                                          null, null);
            _path.translate(classGen, methodGen);
            pathTemp.setStart(il.append(new ASTORE(pathTemp.getIndex())));

            // Create new Dup Filter Iterator
            il.append(new NEW(cpg.addClass(DUP_FILTERED_ITERATOR)));
            il.append(DUP);
            pathTemp.setEnd(il.append(new ALOAD(pathTemp.getIndex())));

            // Initialize Dup Filter Iterator with iterator from the stack
            il.append(new INVOKESPECIAL(initDFI));
        }
        else {
            final int git = cpg.addInterfaceMethodref(DOM_INTF,
                                                      "getIterator",
                                                      "()"+NODE_ITERATOR_SIG);
            il.append(methodGen.loadDOM());
            il.append(new INVOKEINTERFACE(git, 1));
        }
    }
}

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