de.fu_berlin.inf.dpp.activities.PermissionActivity.java Source code

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Here is the source code for de.fu_berlin.inf.dpp.activities.PermissionActivity.java

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/*
 * DPP - Serious Distributed Pair Programming
 * (c) Freie Universitt Berlin - Fachbereich Mathematik und Informatik - 2006
 * (c) Riad Djemili - 2006
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 1, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package de.fu_berlin.inf.dpp.activities;

import org.apache.commons.lang.ObjectUtils;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;

import de.fu_berlin.inf.dpp.session.User;
import de.fu_berlin.inf.dpp.session.User.Permission;

/**
 * A PermissionActivity indicates that a {@link User} has a new
 * {@link Permission}.
 */
@XStreamAlias("permissionActivity")
public class PermissionActivity extends AbstractActivity {

    @XStreamAsAttribute
    protected final Permission permission;

    @XStreamAsAttribute
    protected final User affectedUser;

    /**
     * Creates a new {@link PermissionActivity} which indicates that the given
     * user should change into the given {@link Permission}.
     */
    public PermissionActivity(User source, User affectedUser, Permission permission) {

        super(source);

        if (affectedUser == null)
            throw new IllegalArgumentException("affectedUser must not be null");

        this.affectedUser = affectedUser;
        this.permission = permission;
    }

    @Override
    public boolean isValid() {
        return super.isValid() && (affectedUser != null);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + ObjectUtils.hashCode(affectedUser);
        result = prime * result + ObjectUtils.hashCode(permission);
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!super.equals(obj))
            return false;
        if (!(obj instanceof PermissionActivity))
            return false;

        PermissionActivity other = (PermissionActivity) obj;

        if (this.permission != other.permission)
            return false;
        if (!ObjectUtils.equals(this.affectedUser, other.affectedUser))
            return false;

        return true;
    }

    public User getAffectedUser() {
        return affectedUser;
    }

    public Permission getPermission() {
        return permission;
    }

    @Override
    public String toString() {
        return "PermissionActivity(user: " + getAffectedUser() + ", new permission: " + getPermission() + ")";
    }

    @Override
    public void dispatch(IActivityReceiver receiver) {
        receiver.receive(this);
    }
}