phonebooktable.java

来自「Tapestry的一个练习例子」· Java 代码 · 共 51 行

package com.ttdev.table;

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

public class PhoneBookTable {
	private List entries;

	public PhoneBookTable() {
		entries = new ArrayList();
	}

	public int selectCount() {
		return entries.size();
	}
	public void delete(int id) {
		for (Iterator iter = entries.iterator(); iter.hasNext();) {
		PhoneBookEntry entry = (PhoneBookEntry) iter.next();
		if (entry.getId()==id) {
		iter.remove();
		return;
		}
		}
		}
	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 insert(PhoneBookEntry entry) {
		entries.add(entry);
	}

	public ResultSet selectAll() {
		System.out.println("Selecting all");
		return new ResultSet(entries);
	}
}