menucomponent.java

Struts Menu这是为基于JSP和Struts的应用程序提供的Web菜单框架。菜单可以在一个XML文件中定义

/*
 * MenuComponent.java
 *
 * Created on January 28, 2001, 8:10 PM
 */
package net.sf.navigator.menu;

import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
import java.io.Serializable;

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import org.apache.commons.lang.StringUtils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


/**
 * This class extends {@link MenuBase} and basically contains helper methods
 * for adding and fetching children and parents.
 *
 * @author  Scott Sayles, Matt Raible
 * @version $Revision: 1.6 $ $Date: 2004/03/14 04:16:58 $
 */
public class MenuComponent extends MenuBase implements Serializable {
    //~ Static fields/initializers =============================================
    private static Log log = LogFactory.getLog(MenuComponent.class);
    protected static MenuComponent[] _menuComponent = new MenuComponent[0];

    //~ Instance fields ========================================================

    protected List menuComponents = new ArrayList();
    protected MenuComponent parentMenu = null;

    //~ Constructors ===========================================================

    /** Creates new MenuComponent */
    public MenuComponent() {
        super();
    }

    //~ Methods ================================================================

    public void addMenuComponent(MenuComponent menuComponent) {
        if ((menuComponent.getName() == null) ||
                    (menuComponent.getName().equals(""))) {
                menuComponent.setName(this.name + menuComponents.size());
        }

        if (!menuComponents.contains(menuComponent)) {
            menuComponents.add(menuComponent);
            menuComponent.setParent(this);
        }
    }

    public MenuComponent[] getMenuComponents() {
        MenuComponent[] menus =
            (MenuComponent[]) menuComponents.toArray(_menuComponent);

        return menus;
    }

    public void setParent(MenuComponent parentMenu) {
        if (parentMenu != null) {
            // look up the parent and make sure that it has this menu as a child
            if (!parentMenu.getComponents().contains(this)) {
                parentMenu.addMenuComponent(this);
            }
        }
        this.parentMenu = parentMenu;
    }

    public MenuComponent getParent() {
        return parentMenu;
    }

    /**
     * Convenience method for Velocity templates
     */
    public List getComponents() {
        return menuComponents;
    }

    public String toString() {
        return ToStringBuilder.reflectionToString(this,
                ToStringStyle.MULTI_LINE_STYLE);
    }

    /**
     * This method compares all attributes, except for parent and children
     * @param o
     * @return
     */
    public boolean equals(Object o) {
        if (!(o instanceof MenuComponent)) {
            return false;
        }
        MenuComponent m = (MenuComponent) o;
        // Compare using StringUtils to avoid NullPointerExceptions
        return StringUtils.equals(m.getAction(), this.action) &&
                StringUtils.equals(m.getAltImage(), this.altImage) &&
                StringUtils.equals(m.getDescription(), this.description) &&
                StringUtils.equals(m.getForward(), this.forward) &&
                StringUtils.equals(m.getHeight(), this.height) &&
                StringUtils.equals(m.getImage(), this.image) &&
                StringUtils.equals(m.getLocation(), this.location) &&
                StringUtils.equals(m.getName(), this.name) &&
                StringUtils.equals(m.getOnclick(), this.onclick) &&
                StringUtils.equals(m.getOnmouseout(), this.onmouseout) &&
                StringUtils.equals(m.getOnmouseover(), this.onmouseover) &&
                StringUtils.equals(m.getPage(), this.page) &&
                StringUtils.equals(m.getRoles(), this.roles) &&
                StringUtils.equals(m.getTarget(), this.target) &&
                StringUtils.equals(m.getTitle(), this.title) &&
                StringUtils.equals(m.getToolTip(), this.toolTip) &&
                StringUtils.equals(m.getWidth(), this.width);
    }

    public int hashCode(Object o) {
        return HashCodeBuilder.reflectionHashCode(this);
    }

}