| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001 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 Santiago Pericas-Geertsen |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import java.util.Vector; |
| import java.util.HashSet; |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.bcel.generic.*; |
| import org.apache.xalan.xsltc.compiler.util.*; |
| |
| final class ElementAvailableCall extends FunctionCall { |
| |
| public ElementAvailableCall(QName fname, Vector arguments) { |
| super(fname, arguments); |
| } |
| |
| /** |
| * Force the argument to this function to be a literal string. |
| */ |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| if (argument() instanceof LiteralExpr) { |
| return _type = Type.Boolean; |
| } |
| ErrorMsg err = new ErrorMsg(ErrorMsg.NEED_LITERAL_ERR, |
| "element-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; |
| } |
| |
| /** |
| * Returns the result that this function will return |
| */ |
| public boolean getResult() { |
| try { |
| final LiteralExpr arg = (LiteralExpr) argument(); |
| final String qname = arg.getValue(); |
| final int index = qname.indexOf(':'); |
| final String localName = (index > 0) ? |
| qname.substring(index + 1) : qname; |
| return getParser().elementSupported(arg.getNamespace(), |
| localName); |
| } |
| catch (ClassCastException e) { |
| return false; |
| } |
| } |
| |
| /** |
| * Calls to 'element-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(); |
| final boolean result = getResult(); |
| methodGen.getInstructionList().append(new PUSH(cpg, result)); |
| } |
| } |