| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| |
| 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.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; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Morten Jorgensen |
| */ |
| final class DocumentCall extends FunctionCall { |
| |
| private Expression _arg1 = null; |
| private Expression _arg2 = null; |
| private Type _arg1Type; |
| |
| /** |
| * 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); |
| } |
| if (getStylesheet() == null) { |
| ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this); |
| throw new TypeCheckError(msg); |
| } |
| |
| // Parse the first argument |
| _arg1 = argument(0); |
| |
| if (_arg1 == null) {// should not happened |
| ErrorMsg msg = new ErrorMsg(ErrorMsg.DOCUMENT_ARG_ERR, this); |
| throw new TypeCheckError(msg); |
| } |
| |
| _arg1Type = _arg1.typeCheck(stable); |
| if ((_arg1Type != Type.NodeSet) && (_arg1Type != Type.String)) { |
| _arg1 = new CastExpr(_arg1, Type.String); |
| } |
| |
| // Parse the second argument |
| if (ac == 2) { |
| _arg2 = argument(1); |
| |
| if (_arg2 == null) {// should not happened |
| ErrorMsg msg = new ErrorMsg(ErrorMsg.DOCUMENT_ARG_ERR, this); |
| throw new TypeCheckError(msg); |
| } |
| |
| final Type arg2Type = _arg2.typeCheck(stable); |
| |
| if (arg2Type.identicalTo(Type.Node)) { |
| _arg2 = new CastExpr(_arg2, Type.NodeSet); |
| } else if (arg2Type.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 ac = argumentCount(); |
| |
| final int domField = cpg.addFieldref(classGen.getClassName(), |
| DOM_FIELD, |
| DOM_INTF_SIG); |
| |
| String docParamList = null; |
| if (ac == 1) { |
| // documentF(Object,String,AbstractTranslet,DOM) |
| docParamList = "("+OBJECT_SIG+STRING_SIG+TRANSLET_SIG+DOM_INTF_SIG |
| +")"+NODE_ITERATOR_SIG; |
| } else { //ac == 2; ac < 1 or as >2 was tested in typeChec() |
| // documentF(Object,DTMAxisIterator,String,AbstractTranslet,DOM) |
| docParamList = "("+OBJECT_SIG+NODE_ITERATOR_SIG+STRING_SIG |
| +TRANSLET_SIG+DOM_INTF_SIG+")"+NODE_ITERATOR_SIG; |
| } |
| final int docIdx = cpg.addMethodref(LOAD_DOCUMENT_CLASS, "documentF", |
| docParamList); |
| |
| |
| // The URI can be either a node-set or something else cast to a string |
| _arg1.translate(classGen, methodGen); |
| if (_arg1Type == Type.NodeSet) { |
| _arg1.startIterator(classGen, methodGen); |
| } |
| |
| if (ac == 2) { |
| //_arg2 == null was tested in typeChec() |
| _arg2.translate(classGen, methodGen); |
| _arg2.startIterator(classGen, methodGen); |
| } |
| |
| // Process the rest of the parameters on the stack |
| il.append(new PUSH(cpg, getStylesheet().getSystemId())); |
| il.append(classGen.loadTranslet()); |
| il.append(DUP); |
| il.append(new GETFIELD(domField)); |
| il.append(new INVOKESTATIC(docIdx)); |
| } |
| |
| } |