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/*
 * Copyright 2000,2005 wingS development team.
 *
 * This file is part of wingS (http://wingsframework.org).
 *
 * wingS is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * Please see COPYING for the complete licence.
 */
package org.wings.header;

import org.wings.SimpleURL;
import org.wings.URLResource;
import org.wings.io.Device;

import java.io.IOException;
import java.io.Serializable;

/**
 * Include a <LINK>-element inside the HTML header of rendered page.
 *
 * Example usage to include a customer stylesheet.

 * frame.addHeader(new Link("stylesheet", null, "text/css", null, new DefaultURLResource("../css/appstyles.css")));
 *
 * @author Holger Engels
 */
public class Link implements Header, Serializable {
    protected String rel = null;
    protected String rev = null;
    protected String type = null;
    protected String target = null;
    protected URLResource urlSource = null;

    /**
     *  Example usage to include a customer stylesheet.

     * frame.addHeader(new Link("stylesheet", null, "text/css", null, new DefaultURLResource("../css/appstyles.css")));
     * @param rel
     * @param rev
     * @param type
     * @param target
     * @param urlSource
     */
    public Link(String rel, String rev, String type, String target, URLResource urlSource) {
        this.rel = rel;
        this.rev = rev;
        this.type = type;
        this.target = target;
        this.urlSource = urlSource;
    }

    public void setRel(String rel) {
        this.rel = rel;
    }

    public String getRel() { return rel; }

    public void setRev(String rev) {
        this.rev = rev;
    }

    public String getRev() { return rev; }

    public void setType(String type) {
        this.type = type;
    }

    public String getType() { return type; }

    public SimpleURL getURL() { return urlSource.getURL(); }

    public void setTarget(String target) {
        this.target = target;
    }

    public String getTarget() { return target; }

    @Override
    public void write(Device d) throws IOException {
        d.print("");
    }

    /*
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object obj) {
        if (obj == this)
            return true;
        if (obj == null)
            return false;
        if (!(obj instanceof Link))
            return false;

        Link testObj = (Link) obj;

        if (testObj.rel == null) {
            if (rel != null) {
                return false;
            }
        } else {
            if (!testObj.rel.equals(rel)) {
                return false;
            }
        }

        if (testObj.rev == null) {
            if (rev != null) {
                return false;
            }
        } else {
            if (!testObj.rev.equals(rev)) {
                return false;
            }
        }

        if (testObj.type == null) {
            if (type != null) {
                return false;
            }
        } else {
            if (!testObj.type.equals(type)) {
                return false;
            }
        }

        if (testObj.target == null) {
            if (target != null) {
                return false;
            }
        } else {
            if (!testObj.target.equals(target)) {
                return false;
            }
        }

        if (testObj.getURL() == null) {
            if (getURL() != null) {
                return false;
            }
        } else {
            if (!testObj.getURL().toString().equals(getURL().toString())) {
                return false;
            }
        }
        return true;
    }

    public int hashCode() {
        int hashCode = 17;
        int dispersionFactor = 37;

        hashCode = hashCode * dispersionFactor + ((rel == null) ? 0 : rel.hashCode());
        hashCode = hashCode * dispersionFactor + ((rev == null) ? 0 : rev.hashCode());
        hashCode = hashCode * dispersionFactor + ((type == null) ? 0 : type.hashCode());
        hashCode = hashCode * dispersionFactor + ((target == null) ? 0 : target.hashCode());
        hashCode = hashCode * dispersionFactor + ((getURL() == null) ? 0 : getURL().hashCode());

        return hashCode;
    }

    public String toString() {
        return urlSource.getURL().toString();
    }

}