| /* |
| * @(#)$Id$ |
| * |
| * 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 G. Todd Miller |
| * @author Santiago Pericas-Geertsen |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.util.Vector; |
| |
| import org.apache.bcel.generic.ConstantPoolGen; |
| 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; |
| import org.apache.xalan.xsltc.compiler.util.Util; |
| |
| |
| final class FunctionAvailableCall extends FunctionCall { |
| |
| private Expression _arg; |
| private String _nameOfFunct = null; |
| private String _namespaceOfFunct = null; |
| private boolean _isFunctionAvailable = false; |
| |
| /** |
| * Constructs a FunctionAvailableCall FunctionCall. Takes the |
| * function name qname, for example, 'function-available', and |
| * a list of arguments where the arguments must be instances of |
| * LiteralExpression. |
| */ |
| public FunctionAvailableCall(QName fname, Vector arguments) { |
| super(fname, arguments); |
| _arg = (Expression)arguments.elementAt(0); |
| _type = null; |
| |
| if (_arg instanceof LiteralExpr) { |
| LiteralExpr arg = (LiteralExpr) _arg; |
| _namespaceOfFunct = arg.getNamespace(); |
| _nameOfFunct = arg.getValue(); |
| |
| if (!isInternalNamespace()) { |
| _isFunctionAvailable = hasMethods(); |
| } |
| } |
| } |
| |
| /** |
| * Argument of function-available call must be literal, typecheck |
| * returns the type of function-available to be boolean. |
| */ |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| if (_type != null) { |
| return _type; |
| } |
| if (_arg instanceof LiteralExpr) { |
| return _type = Type.Boolean; |
| } |
| ErrorMsg err = new ErrorMsg(ErrorMsg.NEED_LITERAL_ERR, |
| "function-available", this); |
| throw new TypeCheckError(err); |
| } |
| |
| /** |
| * Returns an object representing the compile-time evaluation |
| * of an expression. We are only using this for function-available |
| * and element-available at this time. |
| */ |
| public Object evaluateAtCompileTime() { |
| return getResult() ? Boolean.TRUE : Boolean.FALSE; |
| } |
| |
| /** |
| * for external java functions only: reports on whether or not |
| * the specified method is found in the specifed class. |
| */ |
| private boolean hasMethods() { |
| LiteralExpr arg = (LiteralExpr)_arg; |
| |
| // Get the class name from the namespace uri |
| String className = getClassNameFromUri(_namespaceOfFunct); |
| |
| // Get the method name from the argument to function-available |
| String methodName = null; |
| int colonIndex = _nameOfFunct.indexOf(":"); |
| if (colonIndex > 0) { |
| String functionName = _nameOfFunct.substring(colonIndex+1); |
| int lastDotIndex = functionName.lastIndexOf('.'); |
| if (lastDotIndex > 0) { |
| methodName = functionName.substring(lastDotIndex+1); |
| if (className != null && !className.equals("")) |
| className = className + "." + functionName.substring(0, lastDotIndex); |
| else |
| className = functionName.substring(0, lastDotIndex); |
| } |
| else |
| methodName = functionName; |
| } |
| else |
| methodName = _nameOfFunct; |
| |
| if (className == null || methodName == null) { |
| return false; |
| } |
| |
| // Replace the '-' characters in the method name |
| if (methodName.indexOf('-') > 0) |
| methodName = replaceDash(methodName); |
| |
| try { |
| final Class clazz = ObjectFactory.findProviderClass( |
| className, ObjectFactory.findClassLoader(), true); |
| |
| if (clazz == null) { |
| return false; |
| } |
| |
| final Method[] methods = clazz.getMethods(); |
| |
| for (int i = 0; i < methods.length; i++) { |
| final int mods = methods[i].getModifiers(); |
| |
| if (Modifier.isPublic(mods) && Modifier.isStatic(mods) |
| && methods[i].getName().equals(methodName)) |
| { |
| return true; |
| } |
| } |
| } |
| catch (ClassNotFoundException e) { |
| return false; |
| } |
| return false; |
| } |
| |
| /** |
| * Reports on whether the function specified in the argument to |
| * xslt function 'function-available' was found. |
| */ |
| public boolean getResult() { |
| if (_nameOfFunct == null) { |
| return false; |
| } |
| |
| if (isInternalNamespace()) { |
| final Parser parser = getParser(); |
| _isFunctionAvailable = |
| parser.functionSupported(Util.getLocalName(_nameOfFunct)); |
| } |
| return _isFunctionAvailable; |
| } |
| |
| /** |
| * Return true if the namespace uri is null or it is the XSLTC translet uri. |
| */ |
| private boolean isInternalNamespace() { |
| return (_namespaceOfFunct == null || |
| _namespaceOfFunct.equals(EMPTYSTRING) || |
| _namespaceOfFunct.equals(TRANSLET_URI)); |
| } |
| |
| /** |
| * Calls to 'function-available' are resolved at compile time since |
| * the namespaces declared in the stylsheet are not available at run |
| * time. Consequently, arguments to this function must be literals. |
| */ |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| methodGen.getInstructionList().append(new PUSH(cpg, getResult())); |
| } |
| |
| } |