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Free open-source Java API for Redmine and Chiliproject bug/task management systems.
There is a newer version: 1.15.0
package org.redmine.ta.internal;

import org.apache.http.NameValuePair;
import org.apache.http.client.utils.URIUtils;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.message.BasicNameValuePair;
import org.redmine.ta.RedmineInternalError;
import org.redmine.ta.beans.*;

import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class URIConfigurator {
	private static final String URL_POSTFIX = ".json";

	private static final Map, String> urls = new HashMap, String>();

	static {
		urls.put(User.class, "users");
		urls.put(Issue.class, "issues");
		urls.put(Project.class, "projects");
		urls.put(TimeEntry.class, "time_entries");
		urls.put(SavedQuery.class, "queries");
		urls.put(IssueStatus.class, "issue_statuses");
		urls.put(Version.class, "versions");
		urls.put(IssueCategory.class, "issue_categories");
		urls.put(Tracker.class, "trackers");
		urls.put(Attachment.class, "attachments");
		urls.put(News.class, "news");
		urls.put(IssueRelation.class, "relations");
		urls.put(Role.class, "roles");
		urls.put(Membership.class, "memberships");
	}

	private final URL baseURL;
	private final String apiAccessKey;

	public URIConfigurator(String host, String apiAccessKey) {
		if (host == null || host.isEmpty()) {
			throw new IllegalArgumentException(
					"The host parameter is NULL or empty");
		}
		try {
			this.baseURL = new URL(host);
		} catch (MalformedURLException e) {
			throw new IllegalArgumentException("Illegal host URL " + host, e);
		}
		this.apiAccessKey = apiAccessKey;
	}

	public URI createURI(String query) {
		return createURI(query, new ArrayList());
	}

	public URI createURI(String query, NameValuePair... param) {
		return createURI(query, Arrays.asList(param));
	}

	/**
	 * @param query
	 *            e.g. "/issues.xml"
	 * @return URI with auth parameter "key" if not in "basic auth mode.
	 */
	private URI createURI(String query,
			Collection origParams) {
		final List params = new ArrayList(
				origParams);
		if (apiAccessKey != null) {
			params.add(new BasicNameValuePair("key", apiAccessKey));
		}
		URI uri;
		try {
			URL url = baseURL;
			String path = url.getPath();
			if (!query.isEmpty()) {
				path += "/" + query;
			}
			uri = URIUtils.createURI(url.getProtocol(), url.getHost(),
					url.getPort(), path,
					URLEncodedUtils.format(params, "UTF-8"), null);
		} catch (URISyntaxException e) {
			throw new RedmineInternalError(e);
		}
		return uri;
	}

	public URI getChildObjectsURI(Class parent, String parentId,
			Class child, NameValuePair... args) {
		final String base = getConfig(parent);
		final String detal = getConfig(child);
		return createURI(base + "/" + parentId + "/" + detal + URL_POSTFIX,
				args);
	}

	public URI getObjectsURI(Class child, NameValuePair... args) {
		final String detal = getConfig(child);
		return createURI(detal + URL_POSTFIX, args);
	}

	public URI getObjectsURI(Class child,
			Collection args) {
		final String detal = getConfig(child);
		return createURI(detal + URL_POSTFIX, args);
	}

	public URI getObjectURI(Class object, String id, NameValuePair... args) {
		final String detal = getConfig(object);
		return createURI(detal + "/" + id + URL_POSTFIX, args);
	}

	private String getConfig(Class item) {
		final String guess = urls.get(item);
		if (guess == null)
			throw new RedmineInternalError("Unsupported item class "
					+ item.getCanonicalName());
		return guess;
	}

	public URI getUploadURI() {
		return createURI("uploads" + URL_POSTFIX);
	}
}