breadcrumbs.java

来自「一个很好的开源项目管理系统源代码」· Java 代码 · 共 46 行

package net.java.workeffort.webapp.support;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.builder.ToStringBuilder;

/**
 * Bread crumbs for the user
 * @author Antony Joseph
 */
public class BreadCrumbs {
    private ArrayList crumbsList = new ArrayList();

    public List getCrumbsList() {
        return (List) crumbsList.clone();
    }

    /**
     * When a match is *not* found for the crumb key the crumb is added to the
     * end of the list. When a match is found all enteries in the list >= the
     * matched index are deleted and then the crumb is added
     * @param crumb
     */
    public synchronized void put(Crumb crumb) {
        int matchIdx = -1;
        for (int i = 0; i < crumbsList.size(); i++) {
            if (crumb.getKey().equals(((Crumb) crumbsList.get(i)).getKey()))
                matchIdx = i;
        }
        if (matchIdx == -1)
            crumbsList.add(crumb);
        else {
            crumbsList.subList(matchIdx, crumbsList.size()).clear();
            crumbsList.add(crumb);
        }
    }

    public synchronized void clear() {
        crumbsList.clear();
    }

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