/*
* @(#)$Id: DocumentCall.java,v 1.15 2003/01/30 18:45:59 mkwan Exp $
*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Sun
* Microsystems., http://www.sun.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* @author Jacek Ambroziak
* @author Morten Jorgensen
*
*/
package org.apache.xalan.xsltc.compiler;
import java.util.Vector;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.GETFIELD;
import org.apache.bcel.generic.INVOKEINTERFACE;
import org.apache.bcel.generic.INVOKESTATIC;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.PUSH;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
final class DocumentCall extends FunctionCall {
private Expression _uri = null;
private Expression _base = null;
private Type _uriType;
/**
* Default function call constructor
*/
public DocumentCall(QName fname, Vector arguments) {
super(fname, arguments);
}
/**
* Type checks the arguments passed to the document() function. The first
* argument can be any type (we must cast it to a string) and contains the
* URI of the document
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
// At least one argument - two at most
final int ac = argumentCount();
if ((ac < 1) || (ac > 2)) {
ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this);
throw new TypeCheckError(msg);
}
// Parse the first argument - the document URI
_uri = argument(0);
if (_uri instanceof LiteralExpr) {
LiteralExpr expr = (LiteralExpr)_uri;
if (expr.getValue().equals(EMPTYSTRING)) {
Stylesheet stylesheet = getStylesheet();
if (stylesheet == null) {
ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this);
throw new TypeCheckError(msg);
}
_uri = new LiteralExpr(stylesheet.getSystemId(), EMPTYSTRING);
}
}
_uriType = _uri.typeCheck(stable);
if ((_uriType != Type.NodeSet) && (_uriType != Type.String)) {
_uri = new CastExpr(_uri, Type.String);
}
// Parse the second argument - the document URI base
if (ac == 2) {
_base = argument(1);
final Type baseType = _base.typeCheck(stable);
if (baseType.identicalTo(Type.Node)) {
_base = new CastExpr(_base, Type.NodeSet);
}
else if (baseType.identicalTo(Type.NodeSet)) {
// falls through
}
else {
ErrorMsg msg = new ErrorMsg(ErrorMsg.DOCUMENT_ARG_ERR, this);
throw new TypeCheckError(msg);
}
}
return _type = Type.NodeSet;
}
/**
* Translates the document() function call to a call to LoadDocument()'s
* static method document().
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final int domField = cpg.addFieldref(classGen.getClassName(),
DOM_FIELD,
DOM_INTF_SIG);
final String docParamList =
"("+OBJECT_SIG+STRING_SIG+STRING_SIG+TRANSLET_SIG+DOM_INTF_SIG+")"+
NODE_ITERATOR_SIG;
final int docIdx = cpg.addMethodref(LOAD_DOCUMENT_CLASS,
"document", docParamList);
final int uriIdx = cpg.addInterfaceMethodref(DOM_INTF,
"getDocumentURI",
"(I)"+STRING_SIG);
final int nextIdx = cpg.addInterfaceMethodref(NODE_ITERATOR,
NEXT, NEXT_SIG);
// The URI can be either a node-set or something else cast to a string
_uri.translate(classGen, methodGen);
if (_uriType == Type.NodeSet)
_uri.startResetIterator(classGen, methodGen);
// The base of the URI may be given as a second argument (a node-set)
il.append(methodGen.loadDOM());
if (_base != null) {
_base.translate(classGen, methodGen);
il.append(new INVOKEINTERFACE(nextIdx, 1));
}
else {
il.append(methodGen.loadContextNode());
}
il.append(new INVOKEINTERFACE(uriIdx, 2));
il.append(new PUSH(cpg, getStylesheet().getSystemId()));
// Feck the rest of the parameters on the stack
il.append(classGen.loadTranslet());
il.append(DUP);
il.append(new GETFIELD(domField));
il.append(new INVOKESTATIC(docIdx));
}
}