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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, Santiago Pericas-Geertsen, Morten Jorgensen
/** * @author Jacek Ambroziak * @author Santiago Pericas-Geertsen * @author Morten Jorgensen */
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 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); } } }