phonebooktable.java

Enjoy Web Dev With Tapestry 一书的源代码

package com.ttdev.phonebook;

import java.util.*;

public class PhoneBookTable {
	private List entries;

	public PhoneBookTable() {
		entries = new ArrayList();
	}
	public void insert(PhoneBookEntry entry) {
		entries.add(entry);
	}
	public ResultSet selectAll() {
		System.out.println("Selecting all");
		return new ResultSet(entries);
	}
	public int selectCount() {
		return entries.size();
	}
	public ResultSet selectLimit(
			int startIdx,
			int noRecords,
			String columnName,
			boolean isAscending) {
		System.out.println("Selecting with limit");
		List sortedEntries = new ArrayList(entries);
		if (columnName != null) {
			Collections.sort(sortedEntries, new PhoneBookEntryComparator(columnName));
			if (!isAscending) {
				Collections.reverse(sortedEntries);
			}
		}
		List subList = sortedEntries.subList(startIdx, startIdx + noRecords);
		return new ResultSet(subList);
	}
	public void delete(int id) {
		for (Iterator iter = entries.iterator(); iter.hasNext();) {
			PhoneBookEntry entry = (PhoneBookEntry) iter.next();
			if (entry.getId()==id) {
				iter.remove();
				return;
			}			
		}
	}
}