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/*
 * 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.commons.collections4.functors;

import org.apache.commons.collections4.Closure;
import org.apache.commons.collections4.FunctorException;

/**
 * {@link Closure} that catches any checked exception and re-throws it as a
 * {@link FunctorException} runtime exception. Example usage:
 *
 * 
 * // Create a catch and re-throw closure via anonymous subclass
 * CatchAndRethrowClosure<String> writer = new ThrowingClosure() {
 *     private java.io.Writer out = // some writer
 *
 *     protected void executeAndThrow(String input) throws IOException {
 *         out.write(input); // throwing of IOException allowed
 *     }
 * };
 *
 * // use catch and re-throw closure
 * java.util.List strList = // some list
 * try {
 *     CollctionUtils.forAllDo(strList, writer);
 * } catch (FunctorException ex) {
 *     Throwable originalError = ex.getCause();
 *     // handle error
 * }
 * 
* * @since 4.0 * @version $Id: CatchAndRethrowClosure.java 1477798 2013-04-30 19:49:02Z tn $ */ public abstract class CatchAndRethrowClosure implements Closure { /** * Execute this closure on the specified input object. * * @param input the input to execute on * @throws FunctorException (runtime) if the closure execution resulted in a * checked exception. */ public void execute(final E input) { try { executeAndThrow(input); } catch (final RuntimeException ex) { throw ex; } catch (final Throwable t) { throw new FunctorException(t); } } /** * Execute this closure on the specified input object. * * @param input the input to execute on * @throws Throwable if the closure execution resulted in a checked * exception. */ protected abstract void executeAndThrow(E input) throws Throwable; }




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