org.openrepose.common.auth.ResponseUnmarshaller.java Source code

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Here is the source code for org.openrepose.common.auth.ResponseUnmarshaller.java

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/*
 * _=_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_=
 * Repose
 * _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
 * Copyright (C) 2010 - 2015 Rackspace US, Inc.
 * _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
 * 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.openrepose.common.auth;

import org.apache.commons.pool.BasePoolableObjectFactory;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.SoftReferenceObjectPool;
import org.openrepose.commons.utils.pooling.ResourceConstructionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

/**
 * @author fran
 */
public class ResponseUnmarshaller {

    private static final Logger LOG = LoggerFactory.getLogger(ResponseUnmarshaller.class);
    private final JAXBContext jaxbContext;
    private final ObjectPool<Unmarshaller> objectPool;

    public ResponseUnmarshaller(JAXBContext jaxbContext) {
        this.jaxbContext = jaxbContext;
        objectPool = new SoftReferenceObjectPool<>(new BasePoolableObjectFactory<Unmarshaller>() {

            @Override
            public Unmarshaller makeObject() {
                try {
                    return ResponseUnmarshaller.this.jaxbContext.createUnmarshaller();
                } catch (JAXBException ex) {
                    throw new ResourceConstructionException("Unable to build jaxb unmarshaller", ex);
                }
            }
        });
    }

    public <T> T unmarshall(final InputStream data, final Class<T> expectedType) throws AuthServiceException {
        Object rtn = null;
        Unmarshaller pooledObject;
        try {
            pooledObject = objectPool.borrowObject();
            try {
                final Object unmarshalledObject = pooledObject.unmarshal(new InputStreamReader(data, "UTF8"));
                if (unmarshalledObject instanceof JAXBElement) {
                    rtn = ((JAXBElement) unmarshalledObject).getValue();
                } else {
                    rtn = unmarshalledObject;
                }
            } catch (UnsupportedEncodingException e) {
                objectPool.invalidateObject(pooledObject);
                pooledObject = null;
                LOG.error("Error reading Response stream in Response Unmarshaller", e);
            } catch (JAXBException jaxbe) {
                objectPool.invalidateObject(pooledObject);
                pooledObject = null;
                throw new AuthServiceException(
                        "Failed to unmarshall response body. Body output is in debug. Reason: "
                                + jaxbe.getMessage(),
                        jaxbe);
            } catch (Exception e) {
                objectPool.invalidateObject(pooledObject);
                pooledObject = null;
                LOG.error("Error reading Response stream in Response Unmarshaller", e);
            } finally {
                if (pooledObject != null) {
                    objectPool.returnObject(pooledObject);
                }
            }
        } catch (AuthServiceException e) {
            throw e;
        } catch (Exception e) {
            LOG.error("Error obtaining Response Unmarshaller", e);
        }
        if (!expectedType.isInstance(rtn)) {
            throw new AuthServiceException(
                    "Failed to unmarshall response body. Unexpected element encountered. Body output is in debug.");
        }
        return expectedType.cast(rtn);
    }
}