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	/*
	* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.sun.org.apache.xalan.internal.xsltc.compiler;

	import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
	import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
	import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
	import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
	import com.sun.org.apache.bcel.internal.generic.InstructionList;
	import com.sun.org.apache.bcel.internal.generic.NEW;
	import com.sun.org.apache.bcel.internal.generic.PUSH;
	import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
	import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
	import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
	import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

	/**
	* @author Jacek Ambroziak
	* @author Santiago Pericas-Geertsen
	* @author Morten Jorgensen
	* @LastModified: Nov 2017
	*/
	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;
	}

	@SuppressWarnings("fallthrough") // at default
	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 = 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 ToXMLStream
	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 ToXMLStream
	il.append(methodGen.loadHandler());
	il.append(new INVOKESPECIAL(
	cpg.addMethodref(STREAM_XML_OUTPUT, "<init>",
	"()V")));

	// Invoke output.setWriter(STRING_WRITER)
	il.append(methodGen.loadHandler());
	il.append(SWAP);
	il.append(new INVOKEINTERFACE(
	cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
	"setWriter",
	"("+WRITER_SIG+")V"), 2));

	// Invoke output.setEncoding("UTF-8")
	il.append(methodGen.loadHandler());
	il.append(new PUSH(cpg, "UTF-8")); // other encodings?
	il.append(new INVOKEINTERFACE(
	cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
	"setEncoding",
	"("+STRING_SIG+")V"), 2));

	// Invoke output.setOmitXMLDeclaration(true)
	il.append(methodGen.loadHandler());
	il.append(ICONST_1);
	il.append(new INVOKEINTERFACE(
	cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
	"setOmitXMLDeclaration",
	"(Z)V"), 2));

	il.append(methodGen.loadHandler());
	il.append(new INVOKEINTERFACE(
	cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
	"startDocument",
	"()V"), 1));

	// Inline translation of contents
	translateContents(classGen, methodGen);

	il.append(methodGen.loadHandler());
	il.append(new INVOKEINTERFACE(
	cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
	"endDocument",
	"()V"), 1));

	// 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);
	}
	}

	}

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