org.jclouds.abiquo.functions.ReturnFalseIfNotAvailable.java Source code

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Here is the source code for org.jclouds.abiquo.functions.ReturnFalseIfNotAvailable.java

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/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.jclouds.abiquo.functions;

import javax.inject.Singleton;

import org.jclouds.http.HttpResponse;
import org.jclouds.http.HttpResponseException;
import org.jclouds.rest.ResourceNotFoundException;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Throwables;
import com.google.common.collect.Iterables;

/**
 * Return false on service error exceptions.
 * 
 * @author Ignasi Barrera
 */
@Singleton
public class ReturnFalseIfNotAvailable implements Function<Exception, Object> {
    @Override
    public Object apply(final Exception from) {
        Throwable exception = Iterables.find(Throwables.getCausalChain(from), isNotAvailableException(from), null);

        if (exception != null) {
            if (exception instanceof HttpResponseException) {
                HttpResponseException responseException = (HttpResponseException) exception;
                HttpResponse response = responseException.getResponse();

                if (response != null && response.getStatusCode() >= 500 && response.getStatusCode() < 600) {
                    return false;
                }
            } else {
                // Will enter here when exception is a ResourceNotFoundException
                return false;
            }
        }

        throw Throwables.propagate(from);
    }

    private static Predicate<Throwable> isNotAvailableException(final Throwable exception) {
        return new Predicate<Throwable>() {
            @Override
            public boolean apply(final Throwable input) {
                boolean notAvailable = input instanceof HttpResponseException
                        && ((HttpResponseException) input).getResponse() != null;

                notAvailable |= input instanceof ResourceNotFoundException;

                return notAvailable;
            }
        };
    }
}