Session.java

package com.niklim.clicktrace.model;

import java.util.List;

import com.google.common.base.Charsets;
import com.google.common.base.Strings;
import com.google.common.hash.HashCode;
import com.google.common.hash.HashFunction;
import com.google.common.hash.Hashing;
import com.niklim.clicktrace.model.helper.ScreenShotLoader;
import com.niklim.clicktrace.model.helper.SessionDeleter;
import com.niklim.clicktrace.model.helper.SessionMetadataLoader;

/**
 * Represents Clicktrace session data. Allows loading and deleting it using
 * Visitor like pattern.
 */
public class Session {
	private String name;
	private String description;
	private List<ScreenShot> shots;
	private SessionMetadata metadata;

	private SessionDeleter deleter;
	private ScreenShotLoader screenShotsLoader;
	private SessionMetadataLoader sessionMetadataHelper;

	/**
	 * Creates session with Visitor objects.
	 * 
	 * @param imageLoader
	 * @param deleter
	 */
	public Session(SessionDeleter deleter, ScreenShotLoader screenShotsLoader,
			SessionMetadataLoader sessionMetadataHelper) {
		this.deleter = deleter;
		this.screenShotsLoader = screenShotsLoader;
		this.sessionMetadataHelper = sessionMetadataHelper;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public List<ScreenShot> getShots() {
		if (shots == null) {
			loadScreenShots();
		}
		return shots;
	}

	public void setShots(List<ScreenShot> shots) {
		this.shots = shots;
	}

	public List<ScreenShot> loadScreenShots() {
		shots = screenShotsLoader.load(this);
		return shots;
	}

	public SessionMetadata loadMetadata() {
		metadata = sessionMetadataHelper.loadMetadata(this);
		return metadata;
	}

	public void delete() {
		deleter.delete(this);
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}

		if (!(o instanceof Session)) {
			return false;
		}
		Session other = (Session) o;

		if (!Strings.nullToEmpty(name).equals(Strings.nullToEmpty(other.getName()))) {
			return false;
		}

		return true;
	}

	@Override
	public int hashCode() {
		HashFunction hf = Hashing.md5();
		HashCode hc = hf.newHasher().putString(name, Charsets.UTF_8).hash();
		return hc.asInt();
	}

	@Override
	public String toString() {
		return name;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

}