| /* |
| * 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 org.apache.openjpa.kernel.exps; |
| |
| import org.apache.openjpa.kernel.StoreContext; |
| |
| /** |
| * Trims leading, trailing, or both charactes from a String. |
| * |
| * @author Marc Prud'hommeaux |
| */ |
| class Trim |
| extends Val { |
| |
| private final Val _val; |
| private final Val _trimChar; |
| private final Boolean _where; |
| |
| /** |
| * Constructor. Provide value to upper-case. |
| */ |
| public Trim(Val val, Val trimChar, Boolean where) { |
| _val = val; |
| _trimChar = trimChar; |
| _where = where; |
| } |
| |
| public Class getType() { |
| return String.class; |
| } |
| |
| public void setImplicitType(Class type) { |
| } |
| |
| protected Object eval(Object candidate, Object orig, |
| StoreContext ctx, Object[] params) { |
| Object eval = _val.eval(candidate, orig, ctx, params); |
| if (eval == null) |
| return null; |
| |
| String toTrim = _trimChar.eval(candidate, orig, ctx, params). |
| toString(); |
| String str = eval.toString(); |
| |
| // null indicates both, TRUE indicates leading |
| if (_where == null || Boolean.TRUE.equals(_where)) { |
| while (str.startsWith(toTrim)) |
| str = str.substring(toTrim.length()); |
| } |
| |
| // null indicates both, FALSE indicates trailing |
| if (_where == null || Boolean.FALSE.equals(_where)) { |
| while (str.endsWith(toTrim)) |
| str = str.substring(0, str.length() - toTrim.length()); |
| } |
| return str; |
| } |
| |
| public void acceptVisit(ExpressionVisitor visitor) { |
| visitor.enter(this); |
| _val.acceptVisit(visitor); |
| _trimChar.acceptVisit(visitor); |
| visitor.exit(this); |
| } |
| } |
| |