number.java

java1.6众多例子参考

	il.append(ALOAD_0);     // this
	il.append(ALOAD_1);     // translet
	il.append(ALOAD_2);     // DOM
	il.append(new ALOAD(3));// iterator

	int index = cpg.addMethodref(ClassNames[_level],
				     "<init>", 
				     "(" + TRANSLET_INTF_SIG
				     + DOM_INTF_SIG
				     + NODE_ITERATOR_SIG 
				     + ")V");
	il.append(new INVOKESPECIAL(index));
	il.append(RETURN);
	
	cons.stripAttributes(true);
	cons.setMaxLocals();
	cons.setMaxStack();
	classGen.addMethod(cons.getMethod());
    }

    /**
     * This method compiles code that is common to matchesFrom() and
     * matchesCount() in the auxillary class.
     */
    private void compileLocals(NodeCounterGenerator nodeCounterGen,
			       MatchGenerator matchGen,
			       InstructionList il) 
    {
	int field;
	LocalVariableGen local;
	ConstantPoolGen cpg = nodeCounterGen.getConstantPool();

	// Get NodeCounter._iterator and store locally
	local = matchGen.addLocalVariable("iterator", 
					  Util.getJCRefType(NODE_ITERATOR_SIG),
					  null, null);
	field = cpg.addFieldref(NODE_COUNTER, "_iterator",
				ITERATOR_FIELD_SIG);
	il.append(ALOAD_0); // 'this' pointer on stack
	il.append(new GETFIELD(field));
	il.append(new ASTORE(local.getIndex()));
	matchGen.setIteratorIndex(local.getIndex());
	
	// Get NodeCounter._translet and store locally
	local = matchGen.addLocalVariable("translet", 
				  Util.getJCRefType(TRANSLET_SIG),
				  null, null);
	field = cpg.addFieldref(NODE_COUNTER, "_translet",
				"Lcom/sun/org/apache/xalan/internal/xsltc/Translet;");
	il.append(ALOAD_0); // 'this' pointer on stack
	il.append(new GETFIELD(field));
	il.append(new CHECKCAST(cpg.addClass(TRANSLET_CLASS)));
	il.append(new ASTORE(local.getIndex()));
	nodeCounterGen.setTransletIndex(local.getIndex());

	// Get NodeCounter._document and store locally
	local = matchGen.addLocalVariable("document", 
					  Util.getJCRefType(DOM_INTF_SIG),
					  null, null);
	field = cpg.addFieldref(_className, "_document", DOM_INTF_SIG);
	il.append(ALOAD_0); // 'this' pointer on stack
	il.append(new GETFIELD(field));
	// Make sure we have the correct DOM type on the stack!!!
	il.append(new ASTORE(local.getIndex()));
	matchGen.setDomIndex(local.getIndex());
    }

    private void compilePatterns(ClassGenerator classGen,
				 MethodGenerator methodGen) 
    {
	int current;
	int field;
	LocalVariableGen local;
	MatchGenerator matchGen;
	NodeCounterGenerator nodeCounterGen;

	_className = getXSLTC().getHelperClassName();
	nodeCounterGen = new NodeCounterGenerator(_className,
						  ClassNames[_level],
						  toString(), 
						  ACC_PUBLIC | ACC_SUPER,
						  null,
						  classGen.getStylesheet());
	InstructionList il = null;
	ConstantPoolGen cpg = nodeCounterGen.getConstantPool();

	// Add a new instance variable for each var in closure
	final int closureLen = (_closureVars == null) ? 0 : 
	    _closureVars.size();

	for (int i = 0; i < closureLen; i++) {
	    VariableBase var = 
		((VariableRefBase) _closureVars.get(i)).getVariable();

	    nodeCounterGen.addField(new Field(ACC_PUBLIC, 
					cpg.addUtf8(var.getEscapedName()),
					cpg.addUtf8(var.getType().toSignature()),
					null, cpg.getConstantPool()));
	}

	// Add a single constructor to the class
	compileConstructor(nodeCounterGen);

	/*
	 * Compile method matchesFrom()
	 */
	if (_from != null) {
	    il = new InstructionList();
	    matchGen =
		new MatchGenerator(ACC_PUBLIC | ACC_FINAL,
				   com.sun.org.apache.bcel.internal.generic.Type.BOOLEAN, 
				   new com.sun.org.apache.bcel.internal.generic.Type[] {
				       com.sun.org.apache.bcel.internal.generic.Type.INT,
				   },
				   new String[] {
				       "node",
				   },
				   "matchesFrom", _className, il, cpg);

	    compileLocals(nodeCounterGen,matchGen,il);

	    // Translate Pattern
	    il.append(matchGen.loadContextNode());
	    _from.translate(nodeCounterGen, matchGen);
	    _from.synthesize(nodeCounterGen, matchGen);
	    il.append(IRETURN);
		    
	    matchGen.stripAttributes(true);
	    matchGen.setMaxLocals();
	    matchGen.setMaxStack();
	    matchGen.removeNOPs();
	    nodeCounterGen.addMethod(matchGen.getMethod());
	}

	/*
	 * Compile method matchesCount()
	 */
	if (_count != null) {
	    il = new InstructionList();
	    matchGen = new MatchGenerator(ACC_PUBLIC | ACC_FINAL,
					  com.sun.org.apache.bcel.internal.generic.Type.BOOLEAN, 
					  new com.sun.org.apache.bcel.internal.generic.Type[] {
					      com.sun.org.apache.bcel.internal.generic.Type.INT,
					  },
					  new String[] {
					      "node",
					  },
					  "matchesCount", _className, il, cpg);

	    compileLocals(nodeCounterGen,matchGen,il);
	    
	    // Translate Pattern
	    il.append(matchGen.loadContextNode());
	    _count.translate(nodeCounterGen, matchGen);
	    _count.synthesize(nodeCounterGen, matchGen);
	    
	    il.append(IRETURN);
		    
	    matchGen.stripAttributes(true);
	    matchGen.setMaxLocals();
	    matchGen.setMaxStack();
	    matchGen.removeNOPs();
	    nodeCounterGen.addMethod(matchGen.getMethod());
	}
	
	getXSLTC().dumpClass(nodeCounterGen.getJavaClass());

	// Push an instance of the newly created class
	cpg = classGen.getConstantPool();
	il = methodGen.getInstructionList();

	final int index = cpg.addMethodref(_className, "<init>", 
					   "(" + TRANSLET_INTF_SIG
					   + DOM_INTF_SIG 
					   + NODE_ITERATOR_SIG
					   + ")V");
	il.append(new NEW(cpg.addClass(_className)));
	il.append(DUP);
	il.append(classGen.loadTranslet());
	il.append(methodGen.loadDOM());
	il.append(methodGen.loadIterator());
	il.append(new INVOKESPECIAL(index));

	// Initialize closure variables
	for (int i = 0; i < closureLen; i++) {
	    final VariableRefBase varRef = (VariableRefBase) _closureVars.get(i);
	    final VariableBase var = varRef.getVariable();
	    final Type varType = var.getType();

	    // Store variable in new closure
	    il.append(DUP);
	    il.append(var.loadInstruction());
	    il.append(new PUTFIELD(
		    cpg.addFieldref(_className, var.getEscapedName(), 
			varType.toSignature())));
	}
    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
	int index;
	final ConstantPoolGen cpg = classGen.getConstantPool();
	final InstructionList il = methodGen.getInstructionList();

	// Push "this" for the call to characters()
	il.append(classGen.loadTranslet());

	if (hasValue()) {
	    compileDefault(classGen, methodGen);
	    _value.translate(classGen, methodGen);

	    // Using java.lang.Math.floor(number + 0.5) to return a double value
            il.append(new PUSH(cpg, 0.5));
            il.append(DADD);
	    index = cpg.addMethodref(MATH_CLASS, "floor", "(D)D");
	    il.append(new INVOKESTATIC(index));

	    // Call setValue on the node counter
	    index = cpg.addMethodref(NODE_COUNTER, 
				     "setValue", 
				     "(D)" + NODE_COUNTER_SIG);
	    il.append(new INVOKEVIRTUAL(index));
	}
	else if (isDefault()) {
	    compileDefault(classGen, methodGen);
	}
	else {
	    compilePatterns(classGen, methodGen);
	}

	// Call setStartNode() 
	if (!hasValue()) {
	    il.append(methodGen.loadContextNode());
	    index = cpg.addMethodref(NODE_COUNTER, 
				     SET_START_NODE, 
				     "(I)" + NODE_COUNTER_SIG);
	    il.append(new INVOKEVIRTUAL(index));
	}

	// Call getCounter() with or without args
	if (_formatNeeded) {
	    if (_format != null) {
		_format.translate(classGen, methodGen);
	    }
	    else {
		il.append(new PUSH(cpg, "1"));
	    }

	    if (_lang != null) {
		_lang.translate(classGen, methodGen);
	    }
	    else {
		il.append(new PUSH(cpg, "en")); 	// TODO ??
	    }

	    if (_letterValue != null) {
		_letterValue.translate(classGen, methodGen);
	    }
	    else {
		il.append(new PUSH(cpg, Constants.EMPTYSTRING));
	    }

	    if (_groupingSeparator != null) {
		_groupingSeparator.translate(classGen, methodGen);
	    }
	    else {
		il.append(new PUSH(cpg, Constants.EMPTYSTRING));
	    }

	    if (_groupingSize != null) {
		_groupingSize.translate(classGen, methodGen);
	    }
	    else {
		il.append(new PUSH(cpg, "0"));
	    }

	    index = cpg.addMethodref(NODE_COUNTER, "getCounter", 
				     "(" + STRING_SIG + STRING_SIG 
				     + STRING_SIG + STRING_SIG 
				     + STRING_SIG + ")" + STRING_SIG);
	    il.append(new INVOKEVIRTUAL(index));
	}
	else {
	    index = cpg.addMethodref(NODE_COUNTER, "setDefaultFormatting", 
				     "()" + NODE_COUNTER_SIG);
	    il.append(new INVOKEVIRTUAL(index));

	    index = cpg.addMethodref(NODE_COUNTER, "getCounter", 
				     "()" + STRING_SIG);
	    il.append(new INVOKEVIRTUAL(index));
	}

	// Output the resulting string to the handler
	il.append(methodGen.loadHandler());
	index = cpg.addMethodref(TRANSLET_CLASS,
				 CHARACTERSW,
				 CHARACTERSW_SIG);
	il.append(new INVOKEVIRTUAL(index));
    }
}