author | joehw |
Wed, 18 Oct 2017 13:25:49 -0700 | |
changeset 47359 | e1a6c0168741 |
parent 47216 | 71c04702a3d5 |
child 47712 | bde0215f1f70 |
permissions | -rw-r--r-- |
6 | 1 |
/* |
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
e1a6c0168741
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* @LastModified: Oct 2017 |
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*/ |
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/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
8b3b3b911b8a
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* contributor license agreements. See the NOTICE file distributed with |
8b3b3b911b8a
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* this work for additional information regarding copyright ownership. |
8b3b3b911b8a
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
8b3b3b911b8a
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* (the "License"); you may not use this file except in compliance with |
8b3b3b911b8a
8162572: Update License Header for all JAXP sources
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* the License. You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package com.sun.org.apache.xalan.internal.xsltc.compiler; |
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import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; |
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import com.sun.org.apache.bcel.internal.generic.PUSH; |
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import com.sun.org.apache.xalan.internal.utils.ObjectFactory; |
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; |
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg; |
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; |
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; |
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; |
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.Modifier; |
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import java.util.List; |
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/** |
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* @author G. Todd Miller |
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* @author Santiago Pericas-Geertsen |
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*/ |
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final class FunctionAvailableCall extends FunctionCall { |
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private Expression _arg; |
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private String _nameOfFunct = null; |
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private String _namespaceOfFunct = null; |
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private boolean _isFunctionAvailable = false; |
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/** |
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* Constructs a FunctionAvailableCall FunctionCall. Takes the |
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* function name qname, for example, 'function-available', and |
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* a list of arguments where the arguments must be instances of |
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* LiteralExpression. |
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*/ |
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public FunctionAvailableCall(QName fname, List<Expression> arguments) { |
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super(fname, arguments); |
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_arg = (Expression)arguments.get(0); |
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_type = null; |
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if (_arg instanceof LiteralExpr) { |
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LiteralExpr arg = (LiteralExpr) _arg; |
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_namespaceOfFunct = arg.getNamespace(); |
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_nameOfFunct = arg.getValue(); |
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if (!isInternalNamespace()) { |
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_isFunctionAvailable = hasMethods(); |
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} |
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} |
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} |
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/** |
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* Argument of function-available call must be literal, typecheck |
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* returns the type of function-available to be boolean. |
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*/ |
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public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
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if (_type != null) { |
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return _type; |
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} |
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if (_arg instanceof LiteralExpr) { |
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return _type = Type.Boolean; |
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} |
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ErrorMsg err = new ErrorMsg(ErrorMsg.NEED_LITERAL_ERR, |
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"function-available", this); |
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throw new TypeCheckError(err); |
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} |
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/** |
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* Returns an object representing the compile-time evaluation |
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* of an expression. We are only using this for function-available |
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* and element-available at this time. |
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*/ |
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public Object evaluateAtCompileTime() { |
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return getResult() ? Boolean.TRUE : Boolean.FALSE; |
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} |
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/** |
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* for external java functions only: reports on whether or not |
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* the specified method is found in the specifed class. |
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*/ |
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private boolean hasMethods() { |
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LiteralExpr arg = (LiteralExpr)_arg; |
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// Get the class name from the namespace uri |
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String className = getClassNameFromUri(_namespaceOfFunct); |
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// Get the method name from the argument to function-available |
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String methodName = null; |
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int colonIndex = _nameOfFunct.indexOf(":"); |
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if (colonIndex > 0) { |
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String functionName = _nameOfFunct.substring(colonIndex+1); |
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int lastDotIndex = functionName.lastIndexOf('.'); |
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if (lastDotIndex > 0) { |
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methodName = functionName.substring(lastDotIndex+1); |
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if (className != null && !className.equals("")) |
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className = className + "." + functionName.substring(0, lastDotIndex); |
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else |
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className = functionName.substring(0, lastDotIndex); |
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} |
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else |
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methodName = functionName; |
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} |
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else |
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methodName = _nameOfFunct; |
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if (className == null || methodName == null) { |
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return false; |
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} |
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// Replace the '-' characters in the method name |
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if (methodName.indexOf('-') > 0) |
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methodName = replaceDash(methodName); |
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try { |
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final Class<?> clazz = ObjectFactory.findProviderClass(className, true); |
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if (clazz == null) { |
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return false; |
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} |
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final Method[] methods = clazz.getMethods(); |
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for (int i = 0; i < methods.length; i++) { |
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final int mods = methods[i].getModifiers(); |
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if (Modifier.isPublic(mods) && Modifier.isStatic(mods) |
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&& methods[i].getName().equals(methodName)) |
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{ |
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return true; |
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} |
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} |
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} |
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catch (ClassNotFoundException e) { |
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return false; |
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} |
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return false; |
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} |
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/** |
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* Reports on whether the function specified in the argument to |
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* xslt function 'function-available' was found. |
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*/ |
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public boolean getResult() { |
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if (_nameOfFunct == null) { |
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return false; |
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} |
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if (isInternalNamespace()) { |
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final Parser parser = getParser(); |
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_isFunctionAvailable = |
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parser.functionSupported(Util.getLocalName(_nameOfFunct)); |
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} |
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return _isFunctionAvailable; |
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} |
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/** |
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* Return true if the namespace uri is null or it is the XSLTC translet uri. |
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*/ |
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private boolean isInternalNamespace() { |
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return (_namespaceOfFunct == null || |
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_namespaceOfFunct.equals(EMPTYSTRING) || |
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_namespaceOfFunct.equals(TRANSLET_URI)); |
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} |
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/** |
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* Calls to 'function-available' are resolved at compile time since |
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* the namespaces declared in the stylsheet are not available at run |
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* time. Consequently, arguments to this function must be literals. |
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*/ |
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public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
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final ConstantPoolGen cpg = classGen.getConstantPool(); |
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methodGen.getInstructionList().append(new PUSH(cpg, getResult())); |
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} |
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} |