/*

 * 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: CopyOf.java,v 1.2.4.1 2005/09/01 12:16:22 pvedula Exp $

 */

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

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.INVOKESTATIC;

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;

/**

 * @author Jacek Ambroziak

 * @author Santiago Pericas-Geertsen

 */

final class CopyOf extends Instruction {

    private Expression _select;

    public void display(int indent) {

        indent(indent);

        Util.println("CopyOf");

        indent(indent + IndentIncrement);

        Util.println("select " + _select.toString());

    }

    public void parseContents(Parser parser) {

        _select = parser.parseExpression(this, "select", null);

        // make sure required attribute(s) have been set

        if (_select.isDummy()) {

            reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "select");

            return;

        }

    }

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {

        final Type tselect = _select.typeCheck(stable);

        if (tselect instanceof NodeType ||

            tselect instanceof NodeSetType ||

            tselect instanceof ReferenceType ||

            tselect instanceof ResultTreeType) {

            // falls through

        }

        else {

            _select = new CastExpr(_select, Type.String);

        }

        return Type.Void;

    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {

        final ConstantPoolGen cpg = classGen.getConstantPool();

        final InstructionList il = methodGen.getInstructionList();

        final Type tselect = _select.getType();

        final String CPY1_SIG = "("+NODE_ITERATOR_SIG+TRANSLET_OUTPUT_SIG+")V";

        final int cpy1 = cpg.addInterfaceMethodref(DOM_INTF, "copy", CPY1_SIG);

        final String CPY2_SIG = "("+NODE_SIG+TRANSLET_OUTPUT_SIG+")V";

        final int cpy2 = cpg.addInterfaceMethodref(DOM_INTF, "copy", CPY2_SIG);

        final String getDoc_SIG = "()"+NODE_SIG;

        final int getDoc = cpg.addInterfaceMethodref(DOM_INTF, "getDocument", getDoc_SIG);

        if (tselect instanceof NodeSetType) {

            il.append(methodGen.loadDOM());

            // push NodeIterator

            _select.translate(classGen, methodGen);

            _select.startIterator(classGen, methodGen);

            // call copy from the DOM 'library'

            il.append(methodGen.loadHandler());

            il.append(new INVOKEINTERFACE(cpy1, 3));

        }

        else if (tselect instanceof NodeType) {

            il.append(methodGen.loadDOM());

            _select.translate(classGen, methodGen);

            il.append(methodGen.loadHandler());

            il.append(new INVOKEINTERFACE(cpy2, 3));

        }

        else if (tselect instanceof ResultTreeType) {

            _select.translate(classGen, methodGen);

            // We want the whole tree, so we start with the root node

            il.append(DUP); //need a pointer to the DOM ;

            il.append(new INVOKEINTERFACE(getDoc,1)); //ICONST_0);

            il.append(methodGen.loadHandler());

            il.append(new INVOKEINTERFACE(cpy2, 3));

        }

        else if (tselect instanceof ReferenceType) {

            _select.translate(classGen, methodGen);

            il.append(methodGen.loadHandler());

            il.append(methodGen.loadCurrentNode());

            il.append(methodGen.loadDOM());

            final int copy = cpg.addMethodref(BASIS_LIBRARY_CLASS, "copy",

                                              "("

                                              + OBJECT_SIG

                                              + TRANSLET_OUTPUT_SIG

                                              + NODE_SIG

                                              + DOM_INTF_SIG

                                              + ")V");

            il.append(new INVOKESTATIC(copy));

        }

        else {

            il.append(classGen.loadTranslet());

            _select.translate(classGen, methodGen);

            il.append(methodGen.loadHandler());

            il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS,

                                                         CHARACTERSW,

                                                         CHARACTERSW_SIG)));

        }

    }

}