org.jclouds.abiquo.handlers.AbiquoErrorHandler.java Source code

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Here is the source code for org.jclouds.abiquo.handlers.AbiquoErrorHandler.java

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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.jclouds.abiquo.handlers;

import static com.google.common.base.Throwables.propagate;
import static javax.ws.rs.core.Response.Status.fromStatusCode;

import java.io.IOException;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.abiquo.domain.exception.AbiquoException;
import org.jclouds.abiquo.functions.ParseErrors;
import org.jclouds.http.HttpCommand;
import org.jclouds.http.HttpErrorHandler;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.HttpResponseException;
import org.jclouds.rest.AuthorizationException;
import org.jclouds.rest.ResourceNotFoundException;

import com.abiquo.model.transport.error.ErrorsDto;
import com.google.common.io.Closeables;

/**
 * Parse Abiquo API errors and set the appropriate exception.
 * 
 * @author Ignasi Barrera
 */
@Singleton
public class AbiquoErrorHandler implements HttpErrorHandler {
    /** The error parser. */
    private ParseErrors errorParser;

    @Inject
    AbiquoErrorHandler(final ParseErrors errorParser) {
        super();
        this.errorParser = errorParser;
    }

    @Override
    public void handleError(final HttpCommand command, final HttpResponse response) {
        Exception exception = null;
        String defaultMessage = String.format("%s -> %s", command.getCurrentRequest().getRequestLine(),
                response.getStatusLine());

        try {
            switch (response.getStatusCode()) {
            case 401:
            case 403:
                // Authorization exceptions do not return an errors DTO, so we
                // encapsulate a
                // generic exception
                exception = new AuthorizationException(defaultMessage,
                        new HttpResponseException(command, response, defaultMessage));
                break;
            case 404:
                exception = new ResourceNotFoundException(defaultMessage,
                        getExceptionToPropagate(command, response, defaultMessage));
                break;
            case 301:
                // Moved resources in Abiquo should be handled with the
                // ReturnMovedResource
                // exception parser to return the moved entity.
                exception = new HttpResponseException(command, response, defaultMessage);
                break;
            default:
                exception = getExceptionToPropagate(command, response, defaultMessage);
                break;
            }
        } finally {
            try {
                Closeables.close(response.getPayload(), true);
                command.setException(exception);
            } catch (IOException e) {
                throw propagate(e);
            }
        }
    }

    private Exception getExceptionToPropagate(final HttpCommand command, final HttpResponse response,
            final String defaultMessage) {
        Exception exception = null;

        if (hasPayload(response)) {
            try {
                ErrorsDto errors = errorParser.apply(response);
                exception = new AbiquoException(fromStatusCode(response.getStatusCode()), errors);
            } catch (Exception ex) {
                // If it is not an Abiquo Exception (can not be unmarshalled),
                // propagate a standard
                // HttpResponseException
                exception = new HttpResponseException(command, response, defaultMessage);
            }
        } else {
            // If it is not an Abiquo Exception (there is not an errors xml in the
            // payload)
            // propagate a standard HttpResponseException
            exception = new HttpResponseException(command, response, defaultMessage);
        }

        return exception;
    }

    private static boolean hasPayload(final HttpResponse response) {
        return response.getPayload() != null && response.getPayload().getContentMetadata() != null
                && response.getPayload().getContentMetadata().getContentLength() != null
                && response.getPayload().getContentMetadata().getContentLength() > 0L;
    }
}