| /* |
| * 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 freemarker.ext.jsp; |
| |
| import java.lang.reflect.Method; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import freemarker.template.utility.ClassUtil; |
| import freemarker.template.utility.StringUtil; |
| |
| final class TaglibMethodUtil { |
| |
| private TaglibMethodUtil() { |
| // Not meant to be instantiated |
| } |
| |
| private static final Pattern FUNCTION_SIGNATURE_PATTERN = |
| Pattern.compile("^([\\w\\.]+(\\s*\\[\\s*\\])?)\\s+([\\w]+)\\s*\\((.*)\\)$"); |
| private static final Pattern FUNCTION_PARAMETER_PATTERN = |
| Pattern.compile("^([\\w\\.]+)(\\s*\\[\\s*\\])?$"); |
| |
| /** |
| * Finds method by function signature string which is compliant with |
| * Tag Library function signature in Java Server Page (TM) Specification. |
| * A function signature example is as follows: {@code java.lang.String nickName( java.lang.String, int)} |
| * |
| * @param clazz Class having the method. |
| * @param signature Java Server Page (TM) Specification compliant function signature string. |
| * @return method if found. |
| */ |
| public static Method getMethodByFunctionSignature(Class clazz, String signature) |
| throws SecurityException, NoSuchMethodException, ClassNotFoundException { |
| Matcher m1 = FUNCTION_SIGNATURE_PATTERN.matcher(signature); |
| |
| if (!m1.matches()) { |
| throw new IllegalArgumentException("Invalid function signature."); |
| } |
| |
| String methodName = m1.group(3); |
| String params = m1.group(4).trim(); |
| Class [] paramTypes = null; |
| |
| if ("".equals(params)) { |
| paramTypes = new Class[0]; |
| } else { |
| String [] paramsArray = StringUtil.split(params, ','); |
| paramTypes = new Class[paramsArray.length]; |
| String token = null; |
| String paramType = null; |
| boolean isPrimitive = false; |
| boolean isArrayType = false; |
| Matcher m2 = null; |
| |
| for (int i = 0; i < paramsArray.length; i++) { |
| token = paramsArray[i].trim(); |
| m2 = FUNCTION_PARAMETER_PATTERN.matcher(token); |
| |
| if (!m2.matches()) { |
| throw new IllegalArgumentException("Invalid argument signature: '" + token + "'."); |
| } |
| |
| paramType = m2.group(1); |
| isPrimitive = (paramType.indexOf('.') == -1); |
| isArrayType = (m2.group(2) != null); |
| |
| if (isPrimitive) { |
| if ("byte".equals(paramType)) { |
| paramTypes[i] = (isArrayType ? byte[].class : byte.class); |
| } else if ("short".equals(paramType)) { |
| paramTypes[i] = (isArrayType ? short[].class : short.class); |
| } else if ("int".equals(paramType)) { |
| paramTypes[i] = (isArrayType ? int[].class : int.class); |
| } else if ("long".equals(paramType)) { |
| paramTypes[i] = (isArrayType ? long[].class : long.class); |
| } else if ("float".equals(paramType)) { |
| paramTypes[i] = (isArrayType ? float[].class : float.class); |
| } else if ("double".equals(paramType)) { |
| paramTypes[i] = (isArrayType ? double[].class : double.class); |
| } else if ("boolean".equals(paramType)) { |
| paramTypes[i] = (isArrayType ? boolean[].class : boolean.class); |
| } else if ("char".equals(paramType)) { |
| paramTypes[i] = (isArrayType ? char[].class : char.class); |
| } else { |
| throw new IllegalArgumentException("Invalid primitive type: '" + paramType + "'."); |
| } |
| } else { |
| if (isArrayType) { |
| paramTypes[i] = ClassUtil.forName("[L" + paramType + ";"); |
| } else { |
| paramTypes[i] = ClassUtil.forName(paramType); |
| } |
| } |
| } |
| } |
| |
| return clazz.getMethod(methodName, paramTypes); |
| } |
| |
| } |