com.smartitengineering.util.rest.client.HttpClient.java Source code

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Here is the source code for com.smartitengineering.util.rest.client.HttpClient.java

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/*
 * This is a utility project for wide range of applications
 *
 * Copyright (C) 2010  Imran M Yousuf (imyousuf@smartitengineering.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  10-1  USA
 */
package com.smartitengineering.util.rest.client;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;
import java.net.URI;
import javax.ws.rs.core.UriBuilder;
import org.apache.commons.lang.StringUtils;

/**
 * A convenient Jersey Client wrapper which intends to create absolute URI from a relative URI
 * @author imyousuf
 */
public class HttpClient {

    private final Client client;
    private final String host;
    private final int port;

    /**
     * Initialize a Jersey based HTTP Client so that relative URI can be handled
     * @param client The client to use to fetch resources
     * @param host The host name or IP address to connect to
     * @param port Port number to connect to
     * @throws IllegalArgumentException If any parameter is null or port is non-positive and greater than 65536
     */
    public HttpClient(Client client, String host, int port) throws IllegalArgumentException {
        if (client == null || StringUtils.isBlank(host) || port < 1 || port > 65536) {
            throw new IllegalArgumentException();
        }
        this.client = client;
        this.host = host;
        this.port = port;
    }

    public WebResource getWebResource(URI resourceUri) {
        return getWebResource(resourceUri, null);
    }

    public WebResource getWebResource(URI resourceUri, URI referrerUri) {
        URI absUri = getAbsoluteUri(resourceUri, referrerUri);
        if (absUri == null) {
            return null;
        }
        final WebResource resource = client.resource(absUri);
        return resource;
    }

    public URI getAbsoluteUri(URI targetUri, URI currentUri) {
        if (targetUri == null) {
            return null;
        }
        if (StringUtils.isNotBlank(targetUri.getHost())) {
            return targetUri;
        } else if (targetUri.getPath().startsWith("/")) {
            UriBuilder builder = UriBuilder.fromUri(targetUri);
            builder.host(host).port(port).scheme("http");
            return builder.build();
        } else {
            final UriBuilder builder;
            if (currentUri != null) {
                builder = UriBuilder.fromUri(currentUri);
                builder.path(targetUri.getPath());
            } else {
                builder = UriBuilder.fromUri(targetUri);
            }
            builder.host(host).port(port).scheme("http");
            return builder.build();
        }
    }

    public Client getClient() {
        return client;
    }

    public String getHost() {
        return host;
    }

    public int getPort() {
        return port;
    }
}