Story.java

package com.sromku.simple.fb.entities;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import android.os.Bundle;

import com.sromku.simple.fb.Permission;
import com.sromku.simple.fb.SimpleFacebook;
import com.sromku.simple.fb.utils.Logger;

/**
 * Open graph story
 * 
 * @author sromku
 * @see http://ogp.me/
 */
public class Story implements Publishable {
	public static final String CHARSET_NAME = "UTF-8";
	private final ActionOpenGraph mAction;
	private final ObjectOpenGraph mObject;

	private Story(ActionOpenGraph action, ObjectOpenGraph object) {
		mAction = action;
		mObject = object;

		// Connect between object and action
		mAction.putProperty(mObject.getObjectName(), mObject.getObjectUrl());
	}

	@Override
	public Bundle getBundle() {
		return mAction.getProperties();
	}

	@Override
	public String getPath() {
		return SimpleFacebook.getConfiguration().getNamespace() + ":" + mAction.getActionName();
	}

	@Override
	public Permission getPermission() {
		return Permission.PUBLISH_ACTION;
	}

	public String getGraphPath(String appNamespace) {
		return "me" + "/" + appNamespace + ":" + mAction.getActionName();
	}

	public Bundle getActionBundle() {
		return mAction.getProperties();
	}

	public static class Builder {
		private String mObjectName = null;
		private String mObjectUrl = null;
		private String mActionName = null;
		private final Bundle mObjectBundle;
		private final Bundle mActionBundle;

		public Builder() {
			mObjectBundle = new Bundle();
			mActionBundle = new Bundle();
		}

		public Builder setObject(String objectName, String objectUrl) {
			mObjectName = objectName;
			mObjectUrl = objectUrl;
			return this;
		}

		public Builder addObjectProperty(String property, String value) {
			mObjectBundle.putString(property, value);
			return this;
		}

		public Builder setAction(String action) {
			mActionName = action;
			return this;
		}

		public Builder addActionProperty(String property, String value) {
			mActionBundle.putString(property, value);
			return this;
		}

		public Builder addActionProperty(String property, boolean value) {
			mActionBundle.putBoolean(property, value);
			return this;
		}

		public Story build() {
			// create story
			ObjectOpenGraph object = new ObjectOpenGraph(mObjectName, mObjectUrl);
			object.setProperties(mObjectBundle);

			ActionOpenGraph action = new ActionOpenGraph(mActionName);
			action.setProperties(mActionBundle);

			return new Story(action, object);
		}

		boolean isEmpty(String str) {
			return str == null || str.length() == 0;
		}
	}

	/**
	 * Action of the open graph
	 * 
	 * @author sromku
	 */
	static class ActionOpenGraph {
		private Bundle mBundle;
		private final String mActionName;

		ActionOpenGraph(String actionName) {
			mBundle = new Bundle();
			mActionName = actionName;
		}

		void putProperty(String property, String value) {
			mBundle.putString(property, value);
		}

		void setProperties(Bundle bundle) {
			this.mBundle = bundle;
		}

		Bundle getProperties() {
			return mBundle;
		}

		String getActionName() {
			return mActionName;
		}
	}

	/**
	 * Object of the open graph
	 * 
	 * @author sromku
	 * 
	 */
	static class ObjectOpenGraph {
		private Bundle mBundle;
		private final String mHostFileUrl;
		private final String mObjectName;

		ObjectOpenGraph(String objectName, String hostFileUrl) {
			mBundle = new Bundle();
			mHostFileUrl = hostFileUrl;
			mObjectName = objectName;
		}

		void putProperty(String property, String value) {
			mBundle.putString(property, value);
		}

		void setProperties(Bundle bundle) {
			this.mBundle = bundle;
		}

		Bundle getProperties() {
			return mBundle;
		}

		String getObjectName() {
			return mObjectName;
		}

		String getObjectUrl() {
			return mHostFileUrl + "?" + encodeUrl(mBundle);
		}

		private static String encodeUrl(Bundle parameters) {
			if (parameters == null) {
				return "";
			}

			StringBuilder sb = new StringBuilder();
			boolean first = true;
			for (String key : parameters.keySet()) {
				Object parameter = parameters.get(key);
				if (!(parameter instanceof String)) {
					continue;
				}

				if (first) {
					first = false;
				}
				else {
					sb.append("&");
				}
				try {
					sb.append(URLEncoder.encode(key, CHARSET_NAME)).append("=").append(URLEncoder.encode(parameters.getString(key), CHARSET_NAME));
				}
				catch (UnsupportedEncodingException e) {
					Logger.logError(Story.class, "Error enconding URL", e);
				}
			}
			return sb.toString();
		}

	}

}