stylesheet.java

java1.6众多例子参考

	    return false;
	}
	else {
	    return _hasLocalParams.booleanValue();
	}
    }

    /**
     * Adds a single prefix mapping to this syntax tree node.
     * @param prefix Namespace prefix.
     * @param uri Namespace URI.
     */
    protected void addPrefixMapping(String prefix, String uri) {
	if (prefix.equals(EMPTYSTRING) && uri.equals(XHTML_URI)) return;
	super.addPrefixMapping(prefix, uri);
    }

    /**
     * Store extension URIs
     */
    private void extensionURI(String prefixes, SymbolTable stable) {
	if (prefixes != null) {
	    StringTokenizer tokens = new StringTokenizer(prefixes);
	    while (tokens.hasMoreTokens()) {
		final String prefix = tokens.nextToken();
		final String uri = lookupNamespace(prefix);
		if (uri != null) {
		    _extensions.put(uri, prefix);
		}
	    }
	}
    }

    public boolean isExtension(String uri) {
	return (_extensions.get(uri) != null);
    }

    public void excludeExtensionPrefixes(Parser parser) {
	final SymbolTable stable = parser.getSymbolTable();
    	final String excludePrefixes = getAttribute("exclude-result-prefixes");
	final String extensionPrefixes = getAttribute("extension-element-prefixes");
	
	// Exclude XSLT uri 
	stable.excludeURI(Constants.XSLT_URI);
	stable.excludeNamespaces(excludePrefixes);
	stable.excludeNamespaces(extensionPrefixes);
	extensionURI(extensionPrefixes, stable);
    }

    /**
     * Parse the version and uri fields of the stylesheet and add an
     * entry to the symbol table mapping the name <tt>__stylesheet_</tt>
     * to an instance of this class.
     */
    public void parseContents(Parser parser) {
	final SymbolTable stable = parser.getSymbolTable();

	/*
	// Make sure the XSL version set in this stylesheet
	if ((_version == null) || (_version.equals(EMPTYSTRING))) {
	    reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR,"version");
	}
	// Verify that the version is 1.0 and nothing else
	else if (!_version.equals("1.0")) {
	    reportError(this, parser, ErrorMsg.XSL_VERSION_ERR, _version);
	}
	*/

	// Add the implicit mapping of 'xml' to the XML namespace URI
	addPrefixMapping("xml", "http://www.w3.org/XML/1998/namespace");

	// Report and error if more than one stylesheet defined
	final Stylesheet sheet = stable.addStylesheet(_name, this);
	if (sheet != null) {
	    // Error: more that one stylesheet defined
	    ErrorMsg err = new ErrorMsg(ErrorMsg.MULTIPLE_STYLESHEET_ERR,this);
	    parser.reportError(Constants.ERROR, err);
	}

	// If this is a simplified stylesheet we must create a template that
	// grabs the root node of the input doc ( <xsl:template match="/"/> ).
	// This template needs the current element (the one passed to this
	// method) as its only child, so the Template class has a special
	// method that handles this (parseSimplified()).
	if (_simplified) {
	    stable.excludeURI(XSLT_URI);
	    Template template = new Template();
	    template.parseSimplified(this, parser);
	}
	// Parse the children of this node
	else {
	    parseOwnChildren(parser);
	}
    }

    /**
     * Parse all direct children of the <xsl:stylesheet/> element.
     */
    public final void parseOwnChildren(Parser parser) {
	final Vector contents = getContents();
	final int count = contents.size();

	// We have to scan the stylesheet element's top-level elements for
	// variables and/or parameters before we parse the other elements
	for (int i = 0; i < count; i++) {
	    SyntaxTreeNode child = (SyntaxTreeNode)contents.elementAt(i);
	    if ((child instanceof VariableBase) ||
		(child instanceof NamespaceAlias)) {
		parser.getSymbolTable().setCurrentNode(child);
		child.parseContents(parser);
	    }
	}

	// Now go through all the other top-level elements...
	for (int i = 0; i < count; i++) {
	    SyntaxTreeNode child = (SyntaxTreeNode)contents.elementAt(i);
	    if (!(child instanceof VariableBase) && 
		!(child instanceof NamespaceAlias)) {
		parser.getSymbolTable().setCurrentNode(child);
		child.parseContents(parser);
	    }

	    // All template code should be compiled as methods if the
	    // <xsl:apply-imports/> element was ever used in this stylesheet
	    if (!_templateInlining && (child instanceof Template)) {
		Template template = (Template)child;
		String name = "template$dot$" + template.getPosition();
		template.setName(parser.getQName(name));
	    }
	}
    }

    public void processModes() {
	if (_defaultMode == null)
	    _defaultMode = new Mode(null, this, Constants.EMPTYSTRING);
	_defaultMode.processPatterns(_keys);
	final Enumeration modes = _modes.elements();
	while (modes.hasMoreElements()) {
	    final Mode mode = (Mode)modes.nextElement();
	    mode.processPatterns(_keys);
	}
    }
	
    private void compileModes(ClassGenerator classGen) {
	_defaultMode.compileApplyTemplates(classGen);
	final Enumeration modes = _modes.elements();
	while (modes.hasMoreElements()) {
	    final Mode mode = (Mode)modes.nextElement();
	    mode.compileApplyTemplates(classGen);
	}
    }

    public Mode getMode(QName modeName) {
	if (modeName == null) {
	    if (_defaultMode == null) {
		_defaultMode = new Mode(null, this, Constants.EMPTYSTRING);
	    }
	    return _defaultMode;
	}
	else {
	    Mode mode = (Mode)_modes.get(modeName);
	    if (mode == null) {
		final String suffix = Integer.toString(_nextModeSerial++);
		_modes.put(modeName, mode = new Mode(modeName, this, suffix));
	    }
	    return mode;
	}
    }

    /**
     * Type check all the children of this node.
     */
    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
	final int count = _globals.size();
	for (int i = 0; i < count; i++) {
	    final VariableBase var = (VariableBase)_globals.elementAt(i);
	    var.typeCheck(stable);
	}
	return typeCheckContents(stable);
    }

    /**
     * Translate the stylesheet into JVM bytecodes. 
     */
    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
	translate();
    }

    private void addDOMField(ClassGenerator classGen) {
	final FieldGen fgen = new FieldGen(ACC_PUBLIC,
					   Util.getJCRefType(DOM_INTF_SIG),
					   DOM_FIELD,
					   classGen.getConstantPool());
	classGen.addField(fgen.getField());
    }
    
    /**
     * Add a static field
     */
    private void addStaticField(ClassGenerator classGen, String type,
                                String name)
    {
        final FieldGen fgen = new FieldGen(ACC_PROTECTED|ACC_STATIC,
                                           Util.getJCRefType(type),
                                           name,
                                           classGen.getConstantPool());
        classGen.addField(fgen.getField());

    }

    /**
     * Translate the stylesheet into JVM bytecodes. 
     */
    public void translate() {
	_className = getXSLTC().getClassName();

	// Define a new class by extending TRANSLET_CLASS
	final ClassGenerator classGen =
	    new ClassGenerator(_className,
			       TRANSLET_CLASS,
			       Constants.EMPTYSTRING,
			       ACC_PUBLIC | ACC_SUPER,
			       null, this);
	
	addDOMField(classGen);

	// Compile transform() to initialize parameters, globals & output
	// and run the transformation
	compileTransform(classGen);

	// Translate all non-template elements and filter out all templates
	final Enumeration elements = elements();
	while (elements.hasMoreElements()) {
	    Object element = elements.nextElement();
	    // xsl:template
	    if (element instanceof Template) {
		// Separate templates by modes
		final Template template = (Template)element;
		//_templates.addElement(template);
		getMode(template.getModeName()).addTemplate(template);
	    }
	    // xsl:attribute-set
	    else if (element instanceof AttributeSet) {
		((AttributeSet)element).translate(classGen, null);
	    }
	    else if (element instanceof Output) {
		// save the element for later to pass to compileConstructor 
		Output output = (Output)element;
		if (output.enabled()) _lastOutputElement = output;
	    }
	    else {
		// Global variables and parameters are handled elsewhere.
		// Other top-level non-template elements are ignored. Literal
		// elements outside of templates will never be output.
	    }
	}

	checkOutputMethod();
	processModes();
	compileModes(classGen);
        compileStaticInitializer(classGen);
	compileConstructor(classGen, _lastOutputElement);

	if (!getParser().errorsFound()) {
	    getXSLTC().dumpClass(classGen.getJavaClass());
	}
    }

    /**
     * Compile the namesArray, urisArray and typesArray into
     * the static initializer. They are read-only from the
     * translet. All translet instances can share a single
     * copy of this informtion.
     */
    private void compileStaticInitializer(ClassGenerator classGen) {
	final ConstantPoolGen cpg = classGen.getConstantPool();
	final InstructionList il = new InstructionList();

	final MethodGenerator staticConst =
	    new MethodGenerator(ACC_PUBLIC|ACC_STATIC,
				com.sun.org.apache.bcel.internal.generic.Type.VOID, 
				null, null, "<clinit>", 
				_className, il, cpg);

	addStaticField(classGen, "[" + STRING_SIG, STATIC_NAMES_ARRAY_FIELD);
	addStaticField(classGen, "[" + STRING_SIG, STATIC_URIS_ARRAY_FIELD);
	addStaticField(classGen, "[I", STATIC_TYPES_ARRAY_FIELD);
	addStaticField(classGen, "[" + STRING_SIG, STATIC_NAMESPACE_ARRAY_FIELD);
        // Create fields of type char[] that will contain literal text from
        // the stylesheet.
        final int charDataFieldCount = getXSLTC().getCharacterDataCount();
        for (int i = 0; i < charDataFieldCount; i++) {
            addStaticField(classGen, STATIC_CHAR_DATA_FIELD_SIG,
                           STATIC_CHAR_DATA_FIELD+i);
        }

	// Put the names array into the translet - used for dom/translet mapping
	final Vector namesIndex = getXSLTC().getNamesIndex();
	int size = namesIndex.size();
	String[] namesArray = new String[size];
	String[] urisArray = new String[size];
	int[] typesArray = new int[size];
	
	int index;
	for (int i = 0; i < size; i++) {
	    String encodedName = (String)namesIndex.elementAt(i);
	    if ((index = encodedName.lastIndexOf(':')) > -1) {
	        urisArray[i] = encodedName.substring(0, index);
	    }
	    
	    index = index + 1;
	    if (encodedName.charAt(index) == '@') {
	    	typesArray[i] = DTM.ATTRIBUTE_NODE;
	    	index++;
	    } else if (encodedName.charAt(index) == '?') {
	    	typesArray[i] = DTM.NAMESPACE_NODE;
	    	index++;
	    } else {
	        typesArray[i] = DTM.ELEMENT_NODE;
	    }
	    
	    if (index == 0) {
	        namesArray[i] = encodedName;
	    }
	    else {
	        namesArray[i] = encodedName.substring(index);
	    }	    
	}
	
	il.append(new PUSH(cpg, size));
	il.append(new ANEWARRAY(cpg.addClass(STRING)));		

	for (int i = 0; i < size; i++) {
	    final String name = namesArray[i];
	    il.append(DUP);
	    il.append(new PUSH(cpg, i));
	    il.append(new PUSH(cpg, name));
	    il.append(AASTORE);
	}
	il.append(new PUTSTATIC(cpg.addFieldref(_className,
					       STATIC_NAMES_ARRAY_FIELD,
					       NAMES_INDEX_SIG)));

	il.append(new PUSH(cpg, size));
	il.append(new ANEWARRAY(cpg.addClass(STRING)));		

	for (int i = 0; i < size; i++) {
	    final String uri = urisArray[i];
	    il.append(DUP);
	    il.append(new PUSH(cpg, i));
	    il.append(new PUSH(cpg, uri));
	    il.append(AASTORE);
	}
	il.append(new PUTSTATIC(cpg.addFieldref(_className,
					       STATIC_URIS_ARRAY_FIELD,
					       URIS_INDEX_SIG)));

	il.append(new PUSH(cpg, size));
	il.append(new NEWARRAY(BasicType.INT));		

	for (int i = 0; i < size; i++) {
	    final int nodeType = typesArray[i];
	    il.append(DUP);
	    il.append(new PUSH(cpg, i));
	    il.append(new PUSH(cpg, nodeType));
	    il.append(IASTORE);
	}
	il.append(new PUTSTATIC(cpg.addFieldref(_className,
					       STATIC_TYPES_ARRAY_FIELD,
					       TYPES_INDEX_SIG)));

	// Put the namespace names array into the translet
	final Vector namespaces = getXSLTC().getNamespaceIndex();
	il.append(new PUSH(cpg, namespaces.size()));
	il.append(new ANEWARRAY(cpg.addClass(STRING)));		

	for (int i = 0; i < namespaces.size(); i++) {
	    final String ns = (String)namespaces.elementAt(i);
	    il.append(DUP);
	    il.append(new PUSH(cpg, i));
	    il.append(new PUSH(cpg, ns));
	    il.append(AASTORE);
	}
	il.append(new PUTSTATIC(cpg.addFieldref(_className,
					       STATIC_NAMESPACE_ARRAY_FIELD,
					       NAMESPACE_INDEX_SIG)));

        // Grab all the literal text in the stylesheet and put it in a char[]
        final int charDataCount = getXSLTC().getCharacterDataCount();
        final int toCharArray = cpg.addMethodref(STRING, "toCharArray", "()[C");
        for (int i = 0; i < charDataCount; i++) {
            il.append(new PUSH(cpg, getXSLTC().getCharacterData(i)));
            il.append(new INVOKEVIRTUAL(toCharArray));
            il.append(new PUTSTATIC(cpg.addFieldref(_className,
                                               STATIC_CHAR_DATA_FIELD+i,
                                               STATIC_CHAR_DATA_FIELD_SIG)));
        }

	il.append(RETURN);

	staticConst.stripAttributes(true);
	staticConst.setMaxLocals();
	staticConst.setMaxStack();
	classGen.addMethod(staticConst.getMethod());
    	
    }

    /**
     * Compile the translet's constructor
     */
    private void compileConstructor(ClassGenerator classGen, Output output) {

	final ConstantPoolGen cpg = classGen.getConstantPool();
	final InstructionList il = new InstructionList();

	final MethodGenerator constructor =
	    new MethodGenerator(ACC_PUBLIC,
				com.sun.org.apache.bcel.internal.generic.Type.VOID, 
				null, null, "<init>", 
				_className, il, cpg);

	// Call the constructor in the AbstractTranslet superclass
	il.append(classGen.loadTranslet());
	il.append(new INVOKESPECIAL(cpg.addMethodref(TRANSLET_CLASS,
						     "<init>", "()V")));
	
	il.append(classGen.loadTranslet());
	il.append(new GETSTATIC(cpg.addFieldref(_className,
	                                        STATIC_NAMES_ARRAY_FIELD,
	                                        NAMES_INDEX_SIG)));
	il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS,
	                                       NAMES_INDEX,
	                                       NAMES_INDEX_SIG)));
	
	il.append(classGen.loadTranslet());
	il.append(new GETSTATIC(cpg.addFieldref(_className,
	                                        STATIC_URIS_ARRAY_FIELD,
	                                        URIS_INDEX_SIG)));
	il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS,
	                                       URIS_INDEX,
	                                       URIS_INDEX_SIG)));

	il.append(classGen.loadTranslet());
	il.append(new GETSTATIC(cpg.addFieldref(_className,
	                                        STATIC_TYPES_ARRAY_FIELD,
	                                        TYPES_INDEX_SIG)));
	il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS,
	                                       TYPES_INDEX,
	                                       TYPES_INDEX_SIG)));

	il.append(classGen.loadTranslet());
	il.append(new GETSTATIC(cpg.addFieldref(_className,
	                                        STATIC_NAMESPACE_ARRAY_FIELD,
	                                        NAMESPACE_INDEX_SIG)));
	il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS,
	                                       NAMESPACE_INDEX,
	                                       NAMESPACE_INDEX_SIG)));

	il.append(classGen.loadTranslet());
        il.append(new PUSH(cpg, AbstractTranslet.CURRENT_TRANSLET_VERSION));
	il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS,
	                                       TRANSLET_VERSION_INDEX,
	                                       TRANSLET_VERSION_INDEX_SIG)));
	
	if (_hasIdCall) {
	    il.append(classGen.loadTranslet());
	    il.append(new PUSH(cpg, Boolean.TRUE));
	    il.append(new PUTFIELD(cpg.addFieldref(TRANSLET_CLASS,
					           HASIDCALL_INDEX,
					           HASIDCALL_INDEX_SIG)));