/*
* @(#)$Id: Message.java,v 1.9 2003/02/21 17:28:51 santiagopg Exp $
*
* 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 Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*
*/
package org.apache.xalan.xsltc.compiler;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.INVOKEINTERFACE;
import org.apache.bcel.generic.INVOKESPECIAL;
import org.apache.bcel.generic.INVOKEVIRTUAL;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.NEW;
import org.apache.bcel.generic.PUSH;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
final class Message extends Instruction {
private boolean _terminate = false;
public void parseContents(Parser parser) {
String termstr = getAttribute("terminate");
if (termstr != null) {
_terminate = termstr.equals("yes");
}
parseChildren(parser);
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
typeCheckContents(stable);
return Type.Void;
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Load the translet (for call to displayMessage() function)
il.append(classGen.loadTranslet());
switch (elementCount()) {
case 0:
il.append(new PUSH(cpg, ""));
break;
case 1:
SyntaxTreeNode child = (SyntaxTreeNode) elementAt(0);
if (child instanceof Text) {
il.append(new PUSH(cpg, ((Text) child).getText()));
break;
}
// falls through
default:
// Push current output handler onto the stack
il.append(methodGen.loadHandler());
// Replace the current output handler by a StreamXMLOutput
il.append(new NEW(cpg.addClass(STREAM_XML_OUTPUT)));
il.append(methodGen.storeHandler());
// Push a reference to a StringWriter
il.append(new NEW(cpg.addClass(STRING_WRITER)));
il.append(DUP);
il.append(DUP);
il.append(new INVOKESPECIAL(
cpg.addMethodref(STRING_WRITER, "<init>", "()V")));
// Load StreamXMLOutput
il.append(methodGen.loadHandler());
il.append(SWAP);
il.append(new PUSH(cpg, "UTF-8")); // other encodings?
il.append(new INVOKESPECIAL(
cpg.addMethodref(STREAM_XML_OUTPUT, "<init>",
"(" + WRITER_SIG + STRING_SIG + ")V")));
// Invoke output.omitHeader(true)
il.append(methodGen.loadHandler());
il.append(ICONST_1);
il.append(new INVOKEVIRTUAL(
cpg.addMethodref(OUTPUT_BASE, "omitHeader",
"(Z)V")));
il.append(methodGen.loadHandler());
il.append(new INVOKEVIRTUAL(
cpg.addMethodref(OUTPUT_BASE, "startDocument",
"()V")));
// Inline translation of contents
translateContents(classGen, methodGen);
il.append(methodGen.loadHandler());
il.append(new INVOKEVIRTUAL(
cpg.addMethodref(OUTPUT_BASE, "endDocument",
"()V")));
// Call toString() on StringWriter
il.append(new INVOKEVIRTUAL(
cpg.addMethodref(STRING_WRITER, "toString",
"()" + STRING_SIG)));
// Restore old output handler
il.append(SWAP);
il.append(methodGen.storeHandler());
break;
}
// Send the resulting string to the message handling method
il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS,
"displayMessage",
"("+STRING_SIG+")V")));
// If 'terminate' attribute is set to 'yes': Instanciate a
// RunTimeException, but it on the stack and throw an exception
if (_terminate == true) {
// Create a new instance of RunTimeException
final int einit = cpg.addMethodref("java.lang.RuntimeException",
"<init>",
"(Ljava/lang/String;)V");
il.append(new NEW(cpg.addClass("java.lang.RuntimeException")));
il.append(DUP);
il.append(new PUSH(cpg,"Termination forced by an " +
"xsl:message instruction"));
il.append(new INVOKESPECIAL(einit));
il.append(ATHROW);
}
}
}