org.eclipse.swordfish.internal.resolver.backend.base.impl.HttpClientProxy.java Source code

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Here is the source code for org.eclipse.swordfish.internal.resolver.backend.base.impl.HttpClientProxy.java

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/*******************************************************************************
 * Copyright (c) 2008, 2009 SOPERA GmbH.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     SOPERA GmbH - initial API and implementation
 *******************************************************************************/
package org.eclipse.swordfish.internal.resolver.backend.base.impl;

import java.io.IOException;

import java.io.Reader;
import java.io.StringReader;
import java.util.Map;

import javax.xml.bind.JAXB;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpURL;
import org.apache.commons.httpclient.methods.DeleteMethod;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.PutMethod;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.eclipse.swordfish.core.SwordfishException;
import org.eclipse.swordfish.core.resolver.backend.ClientRequest;
import org.eclipse.swordfish.core.resolver.backend.ClientResponse;
import org.eclipse.swordfish.core.resolver.backend.ProxyConstants.Method;
import org.eclipse.swordfish.core.resolver.backend.ProxyConstants.Status;
import org.eclipse.swordfish.internal.resolver.backend.base.AbstractProxy;
import org.eclipse.swordfish.internal.resolver.backend.base.RegistryProxyFactory;

import org.springframework.util.Assert;

/**
 *
 */
public class HttpClientProxy extends AbstractProxy {

    private static final Log LOG = LogFactory.getLog(HttpClientProxy.class);

    private HttpClient client;

    public HttpClientProxy() {
        client = new HttpClient();
    }

    @Override
    protected ClientResponse invoke(ClientRequest request) {
        ClientResponse response = null;

        Assert.notNull(request, "Unexpected object state: ClientRequest cannot be null.");
        Assert.notNull(request.getMethod(), "Unexpected object state: request method cannot be null.");
        Assert.notNull(request.getURI(), "Unexpected object state: request URI cannot be null.");

        try {
            response = doInvoke(request);
        } catch (Exception e) {
            LOG.error("Couldn't execute " + request.getMethod() + " request: ", e);
            throw new SwordfishException("Couldn't execute " + request.getMethod() + " method: ", e);
        }
        return response;
    }

    private ClientResponse doInvoke(ClientRequest request) {
        ClientResponse response = RegistryProxyFactory.getInstance().createResponse();
        HttpMethod method = getMethod(request.getMethod());

        try {
            String escapedRequestUrl = request.getURI().toASCIIString();
            HttpURL requestUrl = new HttpURL(escapedRequestUrl.toCharArray());
            if (request.getProperties() != null) {
                Map<String, String> properties = request.getProperties();
                String[] queryNames = properties.keySet().toArray(new String[0]);
                String[] queryValues = properties.values().toArray(new String[0]);
                requestUrl.setQuery(queryNames, queryValues);
            }

            method.setURI(requestUrl);
            int statusCode = getClient().executeMethod(method);
            response.setStatus(Status.get(statusCode));

            String responseBody = method.getResponseBodyAsString();
            if (request.getEntityType() != null) {
                response.setEntity(mapResponse(responseBody, request.getEntityType()));
            } else {
                response.setEntity(responseBody);
            }
        } catch (HttpException e) {
            LOG.error("Couldn't perform call to registry: ", e);
            response.setStatus(Status.ERROR);
            response.setEntity(e);
        } catch (IOException e) {
            LOG.error("Couldn't perform call to registry: ", e);
            response.setStatus(Status.ERROR);
            response.setEntity(e);
        } finally {
            if (method != null) {
                method.releaseConnection();
            }
        }
        return response;
    }

    protected HttpMethod getMethod(Method method) {
        HttpMethod result = null;

        if (method.equals(Method.GET)) {
            result = new GetMethod();
        } else if (method.equals(Method.POST)) {
            result = new PostMethod();
        } else if (method.equals(Method.DELETE)) {
            result = new DeleteMethod();
        } else if (method.equals(Method.PUT)) {
            result = new PutMethod();
        }
        return result;
    }

    private Object mapResponse(String response, Class<? extends Object> etnityType) {
        Object responseObject = null;
        Reader responseReader = new StringReader(response);
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
            responseObject = JAXB.unmarshal(responseReader, etnityType);
        } finally {
            Thread.currentThread().setContextClassLoader(cl);
        }
        return responseObject;
    }

    public HttpClient getClient() {
        return client;
    }

    public void setClient(HttpClient client) {
        this.client = client;
    }

}