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DocumentCall.javaAPI DocJava SE 5 API5766Fri Aug 26 14:55:34 BST 2005com.sun.org.apache.xalan.internal.xsltc.compiler

DocumentCall

public final class DocumentCall extends FunctionCall
author
Jacek Ambroziak
author
Morten Jorgensen

Fields Summary
private Expression
_arg1
private Expression
_arg2
private Type
_arg1Type
Constructors Summary
public DocumentCall(QName fname, Vector arguments)
Default function call constructor


             
         
        super(fname, arguments);
Methods Summary
public voidtranslate(com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator classGen, com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator methodGen)
Translates the document() function call to a call to LoadDocument()'s static method document().

        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);       
        }
    
        // Feck 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));
public com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypetypeCheck(com.sun.org.apache.xalan.internal.xsltc.compiler.SymbolTable stable)
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

        // 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;