| /* |
| * 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; |
| |
| /** |
| * Concatenate two strings together. |
| * |
| * @author Marc Prud'hommeaux |
| */ |
| class Concat |
| extends Val { |
| |
| private final Val _val; |
| private final Val _args; |
| |
| /** |
| * Constructor. Provide target string and the arguments to the |
| * indexOf method. |
| */ |
| public Concat(Val val, Val args) { |
| _val = val; |
| _args = args; |
| } |
| |
| public Class getType() { |
| return String.class; |
| } |
| |
| public void setImplicitType(Class type) { |
| } |
| |
| protected Object eval(Object candidate, Object orig, |
| StoreContext ctx, Object[] params) { |
| Object str = _val.eval(candidate, orig, ctx, params); |
| StringBuffer cat = new StringBuffer(str.toString()); |
| |
| Object arg = _args.eval(candidate, orig, ctx, params); |
| if (arg instanceof Object[]) { |
| for (int i = 0; i < ((Object[]) arg).length; i++) |
| cat.append((((Object[]) arg)[i]).toString()); |
| } else |
| cat.append(arg.toString()); |
| |
| return cat.toString(); |
| } |
| |
| public void acceptVisit(ExpressionVisitor visitor) { |
| visitor.enter(this); |
| _val.acceptVisit(visitor); |
| _args.acceptVisit(visitor); |
| visitor.exit(this); |
| } |
| } |
| |