rollermessages.java

这个weblogging 设计得比较精巧

package org.roller.util;

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

/**
 * Holds collection of error messages and collection of status messages.
 * @author David M Johnson
 */
public class RollerMessages
{
    private List mErrors = new ArrayList();
    private List mMessages = new ArrayList();
    
    public RollerMessages() 
    {
    }
    public void addError(String key)
    {
        mErrors.add(new RollerMessage(key, null));
    }
    public void addError(String key, String arg)
    {
        mErrors.add(new RollerMessage(key, new String[]{arg}));
    }
    public void addError(String key, String[] args)
    {
        mErrors.add(new RollerMessage(key, args));
    }
    public void addMessage(String key)
    {
        mMessages.add(new RollerMessage(key, null));
    }
    public void addMessage(String key, String arg)
    {
        mMessages.add(new RollerMessage(key, new String[]{arg}));
    }
    public void addMessage(String key, String[] args)
    {
        mMessages.add(new RollerMessage(key, args));
    }
    public Iterator getErrors()
    {
        return mErrors.iterator();
    }
    public Iterator getMessages()
    {
        return mMessages.iterator();
    }
    public int getErrorCount() 
    {
        return mErrors.size();
    }
    public int getMessageCount() 
    {
        return mMessages.size();
    }
    public String toString() 
    {
        StringBuffer sb = new StringBuffer();
        Iterator msgs = mMessages.iterator();
        while (msgs.hasNext())
        {
            RollerMessage msg = (RollerMessage) msgs.next();
            sb.append(msg.getKey());
            sb.append(" : ");
        }
        Iterator errs = mErrors.iterator();
        while (errs.hasNext())
        {
            RollerMessage msg = (RollerMessage) errs.next();
            sb.append(msg.getKey());
            sb.append(" : ");
        }
        return sb.toString();
    }
    public static class RollerMessage
    {
        private String mKey;
        private String[] mArgs;
        public RollerMessage(String key, String[] args)
        {
            mKey = key;
            mArgs = args;
        }
        public String[] getArgs()
        {
            return mArgs;
        }
        public void setArgs(String[] args)
        {
            mArgs = args;
        }
        public String getKey()
        {
            return mKey;
        }
        public void setKey(String key)
        {
            mKey = key;
        }
    }
}