OAuthServiceBuilder.java

package org.oauth2.client4j.builder;

import org.oauth2.client4j.builder.provider.Provider;
import org.oauth2.client4j.http.DefaultHttpClient;
import org.oauth2.client4j.http.client.HttpClient;
import org.oauth2.client4j.model.OAuthConfig;
import org.oauth2.client4j.service.OAuthService;

public class OAuthServiceBuilder {
	private String apiKey;
	private String apiSecret;
	private String callback;
	private Provider provider;
	private String scope;
	
	private HttpClient client;
	
	public OAuthServiceBuilder()
	{
		this.client = new DefaultHttpClient();
	}

	public OAuthServiceBuilder provider(Class<? extends Provider> providerClass) {
		this.provider = createProvider(providerClass);
		return this;
	}
	public OAuthServiceBuilder provider(Provider provider)
	{
		this.provider = provider;
		return this;
	}

	private Provider createProvider(Class<? extends Provider> providerClass) {
		Provider provider;
		try {
			provider = providerClass.newInstance();
		} catch (Exception e) {
			throw new RuntimeException("Error while creating the provider object", e);
		}
		return provider;
	}

	public OAuthServiceBuilder callback(String callback) {
		this.callback = callback;
		return this;
	}

	public OAuthServiceBuilder apiKey(String apiKey) {
		this.apiKey = apiKey;
		return this;
	}

	public OAuthServiceBuilder apiSecret(String apiSecret) {
		this.apiSecret = apiSecret;
		return this;
	}

	public OAuthServiceBuilder scope(String scope) {
		this.scope = scope;
		return this;
	}

	public OAuthServiceBuilder customHttpClient(HttpClient client)
	{
		this.client = client;
		return this;
	}

	public OAuthService build() {
		OAuthService oauthService = provider.createService(new OAuthConfig(apiKey, apiSecret,
				callback, scope));
		
		oauthService.cutomeHttpClient(client);
		return oauthService;
	}

}