| // Copyright 2006, 2007 The Apache Software Foundation |
| // |
| // Licensed 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.tapestry5.ioc.internal.services; |
| |
| import org.apache.tapestry5.ioc.services.Coercion; |
| |
| /** |
| * Combines two coercions to create a coercsion through an intermediate type. |
| * |
| * @param <S> The source (input) type |
| * @param <I> The intermediate type |
| * @param <T> The target (output) type |
| */ |
| public class CompoundCoercion<S, I, T> implements Coercion<S, T> |
| { |
| private final Coercion<S, I> op1; |
| |
| private final Coercion<I, T> op2; |
| |
| public CompoundCoercion(Coercion<S, I> op1, Coercion<I, T> op2) |
| { |
| this.op1 = op1; |
| this.op2 = op2; |
| } |
| |
| public T coerce(S input) |
| { |
| // Run the input through the first operation (S --> I), then run the result of that through |
| // the second operation (I --> T). |
| |
| I intermediate = op1.coerce(input); |
| |
| return op2.coerce(intermediate); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return String.format("%s, %s", op1, op2); |
| } |
| } |