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Java example source code file (ApplyTemplates.java)

This example Java source code file (ApplyTemplates.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

applytemplates, errormsg, indentincrement, instructionlist, invokeinterface, invokevirtual, methodgenerator, node_iterator_sig, pop_param_frame, referencetype, resulttreetype, string, typecheckerror, util, vector

The ApplyTemplates.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: ApplyTemplates.java,v 1.2.4.1 2005/09/12 09:59:21 pvedula Exp $
 */

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

import java.util.Enumeration;
import java.util.Vector;

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.INVOKEVIRTUAL;
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.ErrorMsg;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeSetType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ReferenceType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ResultTreeType;
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;
import com.sun.org.apache.xml.internal.utils.XML11Char;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
final class ApplyTemplates extends Instruction {
    private Expression _select;
    private Type       _type = null;
    private QName      _modeName;
    private String     _functionName;

    public void display(int indent) {
        indent(indent);
        Util.println("ApplyTemplates");
        indent(indent + IndentIncrement);
        Util.println("select " + _select.toString());
        if (_modeName != null) {
            indent(indent + IndentIncrement);
            Util.println("mode " + _modeName);
        }
    }

    public boolean hasWithParams() {
        return hasContents();
    }

    public void parseContents(Parser parser) {
        final String select = getAttribute("select");
        final String mode   = getAttribute("mode");

        if (select.length() > 0) {
            _select = parser.parseExpression(this, "select", null);

        }

        if (mode.length() > 0) {
            if (!XML11Char.isXML11ValidQName(mode)) {
                ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, mode, this);
                parser.reportError(Constants.ERROR, err);
            }
            _modeName = parser.getQNameIgnoreDefaultNs(mode);
        }

        // instantiate Mode if needed, cache (apply temp) function name
        _functionName =
            parser.getTopLevelStylesheet().getMode(_modeName).functionName();
        parseChildren(parser);// with-params
    }

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
        if (_select != null) {
            _type = _select.typeCheck(stable);
            if (_type instanceof NodeType || _type instanceof ReferenceType) {
                _select = new CastExpr(_select, Type.NodeSet);
                _type = Type.NodeSet;
            }
            if (_type instanceof NodeSetType||_type instanceof ResultTreeType) {
                typeCheckContents(stable); // with-params
                return Type.Void;
            }
            throw new TypeCheckError(this);
        }
        else {
            typeCheckContents(stable);          // with-params
            return Type.Void;
        }
    }

    /**
     * Translate call-template. A parameter frame is pushed only if
     * some template in the stylesheet uses parameters.
     */
    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
        boolean setStartNodeCalled = false;
        final Stylesheet stylesheet = classGen.getStylesheet();
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();
        final int current = methodGen.getLocalIndex("current");

        // check if sorting nodes is required
        final Vector sortObjects = new Vector();
        final Enumeration children = elements();
        while (children.hasMoreElements()) {
            final Object child = children.nextElement();
            if (child instanceof Sort) {
                sortObjects.addElement(child);
            }
        }

        // Push a new parameter frame
        if (stylesheet.hasLocalParams() || hasContents()) {
            il.append(classGen.loadTranslet());
            final int pushFrame = cpg.addMethodref(TRANSLET_CLASS,
                                                   PUSH_PARAM_FRAME,
                                                   PUSH_PARAM_FRAME_SIG);
            il.append(new INVOKEVIRTUAL(pushFrame));
            // translate with-params
            translateContents(classGen, methodGen);
        }


        il.append(classGen.loadTranslet());

        // The 'select' expression is a result-tree
        if ((_type != null) && (_type instanceof ResultTreeType)) {
            // <xsl:sort> cannot be applied to a result tree - issue warning
            if (sortObjects.size() > 0) {
                ErrorMsg err = new ErrorMsg(ErrorMsg.RESULT_TREE_SORT_ERR,this);
                getParser().reportError(WARNING, err);
            }
            // Put the result tree (a DOM adapter) on the stack
            _select.translate(classGen, methodGen);
            // Get back the DOM and iterator (not just iterator!!!)
            _type.translateTo(classGen, methodGen, Type.NodeSet);
        }
        else {
            il.append(methodGen.loadDOM());

            // compute node iterator for applyTemplates
            if (sortObjects.size() > 0) {
                Sort.translateSortIterator(classGen, methodGen,
                                           _select, sortObjects);
                int setStartNode = cpg.addInterfaceMethodref(NODE_ITERATOR,
                                                             SET_START_NODE,
                                                             "(I)"+
                                                             NODE_ITERATOR_SIG);
                il.append(methodGen.loadCurrentNode());
                il.append(new INVOKEINTERFACE(setStartNode,2));
                setStartNodeCalled = true;
            }
            else {
                if (_select == null)
                    Mode.compileGetChildren(classGen, methodGen, current);
                else
                    _select.translate(classGen, methodGen);
            }
        }

        if (_select != null && !setStartNodeCalled) {
            _select.startIterator(classGen, methodGen);
        }

        //!!! need to instantiate all needed modes
        final String className = classGen.getStylesheet().getClassName();
        il.append(methodGen.loadHandler());
        final String applyTemplatesSig = classGen.getApplyTemplatesSig();
        final int applyTemplates = cpg.addMethodref(className,
                                                    _functionName,
                                                    applyTemplatesSig);
        il.append(new INVOKEVIRTUAL(applyTemplates));

        // Pop parameter frame
        if (stylesheet.hasLocalParams() || hasContents()) {
            il.append(classGen.loadTranslet());
            final int popFrame = cpg.addMethodref(TRANSLET_CLASS,
                                                  POP_PARAM_FRAME,
                                                  POP_PARAM_FRAME_SIG);
            il.append(new INVOKEVIRTUAL(popFrame));
        }
    }
}

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