| /* |
| * @(#)$Id$ |
| * |
| * 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 |
| * @author Morten Jorgensen |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import org.apache.xalan.xsltc.compiler.util.*; |
| |
| final class When extends Instruction { |
| |
| private static final String NO_CHOOSE_ERROR = |
| "Instruction 'when' must be used within a 'choose'."; |
| |
| private Expression _test; |
| private boolean _ignore = false; |
| |
| public void display(int indent) { |
| indent(indent); |
| Util.println("When"); |
| indent(indent + IndentIncrement); |
| System.out.print("test "); |
| Util.println(_test.toString()); |
| displayContents(indent + IndentIncrement); |
| } |
| |
| public Expression getTest() { |
| return _test; |
| } |
| |
| public boolean ignore() { |
| return(_ignore); |
| } |
| |
| public void parseContents(Parser parser) { |
| _test = parser.parseExpression(this, "test", null); |
| if (_test instanceof ElementAvailableCall) { |
| ElementAvailableCall call = (ElementAvailableCall)_test; |
| _ignore = !call.getResult(); |
| } |
| if (_test instanceof FunctionAvailableCall) { |
| FunctionAvailableCall call = (FunctionAvailableCall)_test; |
| _ignore = !call.getResult(); |
| } |
| |
| parseChildren(parser); |
| |
| // Make sure required attribute(s) have been set |
| if (_test.isDummy()) { |
| reportError(this, parser, ErrorMsg.NREQATTR_ERR, "test"); |
| } |
| } |
| |
| /** |
| * Type-check this when element. The test should always be type checked, |
| * while we do not bother with the contents if we know the test fails. |
| * This is important in cases where the "test" expression tests for |
| * the support of a non-available element, and the <xsl:when> body contains |
| * this non-available element. |
| */ |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| // Type-check the test expression |
| if (_test.typeCheck(stable) instanceof BooleanType == false) { |
| _test = new CastExpr(_test, Type.Boolean); |
| } |
| // Type-check the contents (if necessary) |
| if (!_ignore) { |
| typeCheckContents(stable); |
| } |
| |
| return Type.Void; |
| } |
| |
| /** |
| * This method should never be called. An Otherwise object will explicitly |
| * translate the "test" expression and and contents of this element. |
| */ |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ErrorMsg msg = new ErrorMsg(NO_CHOOSE_ERROR, getLineNumber()); |
| getParser().reportError(Constants.ERROR, msg); |
| } |
| } |