ca.uhn.fhir.rest.client.apache.ApacheHttpResponse.java Source code

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Here is the source code for ca.uhn.fhir.rest.client.apache.ApacheHttpResponse.java

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package ca.uhn.fhir.rest.client.apache;

/*
 * #%L
 * HAPI FHIR - Core Library
 * %%
 * Copyright (C) 2014 - 2016 University Health Network
 * %%
 * 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.
 * #L%
 */

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.io.IOUtils;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.entity.ContentType;

import ca.uhn.fhir.rest.client.api.IHttpResponse;
import ca.uhn.fhir.rest.server.Constants;
import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;

/**
 * A Http Response based on Apache. This is an adapter around the class
 * {@link org.apache.http.HttpResponse HttpResponse}
 * 
 * @author Peter Van Houte | peter.vanhoute@agfa.com | Agfa Healthcare
 */
public class ApacheHttpResponse implements IHttpResponse {

    private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(ApacheHttpResponse.class);

    private boolean myEntityBuffered = false;
    private final HttpResponse myResponse;
    private byte[] myEntityBytes;

    public ApacheHttpResponse(HttpResponse theResponse) {
        this.myResponse = theResponse;
    }

    @Override
    public HttpResponse getResponse() {
        return myResponse;
    }

    @Override
    public int getStatus() {
        return myResponse.getStatusLine().getStatusCode();
    }

    @Override
    public String getMimeType() {
        ContentType ct = ContentType.get(myResponse.getEntity());
        return ct != null ? ct.getMimeType() : null;
    }

    @Override
    public Map<String, List<String>> getAllHeaders() {
        Map<String, List<String>> headers = new HashMap<String, List<String>>();
        if (myResponse.getAllHeaders() != null) {
            for (Header next : myResponse.getAllHeaders()) {
                String name = next.getName().toLowerCase();
                List<String> list = headers.get(name);
                if (list == null) {
                    list = new ArrayList<String>();
                    headers.put(name, list);
                }
                list.add(next.getValue());
            }

        }
        return headers;
    }

    @Override
    public String getStatusInfo() {
        return myResponse.getStatusLine().getReasonPhrase();
    }

    @Override
    public Reader createReader() throws IOException {
        HttpEntity entity = myResponse.getEntity();
        if (entity == null) {
            return new StringReader("");
        }
        Charset charset = null;
        if (entity.getContentType() != null && entity.getContentType().getElements() != null
                && entity.getContentType().getElements().length > 0) {
            ContentType ct = ContentType.get(entity);
            charset = ct.getCharset();
        }
        if (charset == null) {
            if (Constants.STATUS_HTTP_204_NO_CONTENT != myResponse.getStatusLine().getStatusCode()) {
                ourLog.warn("Response did not specify a charset.");
            }
            charset = Charset.forName("UTF-8");
        }

        Reader reader = new InputStreamReader(readEntity(), charset);
        return reader;
    }

    @Override
    public InputStream readEntity() throws IOException {
        if (this.myEntityBuffered) {
            return new ByteArrayInputStream(myEntityBytes);
        } else if (myResponse.getEntity() != null) {
            return myResponse.getEntity().getContent();
        } else {
            return null;
        }
    }

    @Override
    public void close() {
        if (myResponse instanceof CloseableHttpResponse) {
            try {
                ((CloseableHttpResponse) myResponse).close();
            } catch (IOException e) {
                ourLog.debug("Failed to close response", e);
            }
        }
    }

    @Override
    public void bufferEntitity() throws IOException {
        if (myEntityBuffered) {
            return;
        }
        InputStream respEntity = readEntity();
        if (respEntity != null) {
            this.myEntityBuffered = true;
            try {
                this.myEntityBytes = IOUtils.toByteArray(respEntity);
            } catch (IllegalStateException e) {
                throw new InternalErrorException(e);
            }
        }
    }
}