| /* |
| * 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.opensymphony.xwork2.util; |
| |
| import org.apache.commons.lang3.StringUtils; |
| |
| /** |
| * OGNL implementation of {@link TextParser} |
| */ |
| public class OgnlTextParser implements TextParser { |
| |
| public Object evaluate(char[] openChars, String expression, TextParseUtil.ParsedValueEvaluator evaluator, int maxLoopCount) { |
| // deal with the "pure" expressions first! |
| //expression = expression.trim(); |
| Object result = expression = (expression == null) ? "" : expression; |
| int pos = 0; |
| |
| for (char open : openChars) { |
| int loopCount = 1; |
| //this creates an implicit StringBuffer and shouldn't be used in the inner loop |
| final String lookupChars = open + "{"; |
| |
| while (true) { |
| int start = expression.indexOf(lookupChars, pos); |
| if (start == -1) { |
| loopCount++; |
| start = expression.indexOf(lookupChars); |
| } |
| if (loopCount > maxLoopCount) { |
| // translateVariables prevent infinite loop / expression recursive evaluation |
| break; |
| } |
| int length = expression.length(); |
| int x = start + 2; |
| int end; |
| char c; |
| int count = 1; |
| while (start != -1 && x < length && count != 0) { |
| c = expression.charAt(x++); |
| if (c == '{') { |
| count++; |
| } else if (c == '}') { |
| count--; |
| } |
| } |
| end = x - 1; |
| |
| if ((start != -1) && (end != -1) && (count == 0)) { |
| String var = expression.substring(start + 2, end); |
| |
| Object o = evaluator.evaluate(var); |
| |
| String left = expression.substring(0, start); |
| String right = expression.substring(end + 1); |
| String middle = null; |
| if (o != null) { |
| middle = o.toString(); |
| if (StringUtils.isEmpty(left)) { |
| result = o; |
| } else { |
| result = left.concat(middle); |
| } |
| |
| if (StringUtils.isNotEmpty(right)) { |
| result = result.toString().concat(right); |
| } |
| |
| expression = left.concat(middle).concat(right); |
| } else { |
| // the variable doesn't exist, so don't display anything |
| expression = left.concat(right); |
| result = expression; |
| } |
| pos = (left != null && left.length() > 0 ? left.length() - 1: 0) + |
| (middle != null && middle.length() > 0 ? middle.length() - 1: 0) + |
| 1; |
| pos = Math.max(pos, 1); |
| } else { |
| break; |
| } |
| } |
| } |
| return result; |
| } |
| } |