Archive for November, 2005

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这是Steve Jobs在斯坦福毕业典礼上的演讲中的一句话:


http://news-service.stanford.edu/news/2005/june15/jobs-061505.html


想说的是,看到了两个中文版本的翻译,我觉得都不错:



物有所不足,智有所不明


好学若饥、谦卑若愚



这类演讲其实原来也看过不少,比如Carly在北卡的演讲,感想如下:


成功不可复制,自己需要努力。

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在包org.apache.lucene.document中,三个类,其中DateField是用来处理日期与字符串转换的工具类,来方便的处理日期类型的Field。


Field就像我们学过的数据库中的字段,简单的说,就是一个名值对。这个域有三种属性,分别是



isStored - 是否被存储


isIndexed - 是否被索引


isTokenized - 是否分词



这些属性的组合又构成了四种不同类型的Field,而且各有用途,用Xerdoc DSearch中举个例子:


Buy Modalert Without Prescription, Keyword(String name, String value)


存储、索引、不分词,用于URI(比如MSN聊天记录的日期域、比如MP3文件的文件全路径等等)


UnIndexed(String name, String value)


存储、不索引、不分词,比如文件的全路径


UnStored(String name, String value)


不存储、索引、分词,比如HTML的正文、Word的内容等等,这部分内容是要被索引的,但是由于具体内容通常很大,没有必要再进行存储,可以到时候根据URI再来挖取。所以,这部分只分词、索引,而不存储。


Text(String name, String value)


存储、索引、分词,比如文件的各种属性,比如MP3文件的歌手、专辑等等。


Text(String name, Reader value)


不存储、索引、分词。


Field经常需要进行Name的比较,比如:


[code lang="java"]
/** Returns a field with the given name if any exist in this document, or
* null. If multiple fields exists with this name, order Modalert from United States pharmacy, Modalert over the counter, this method returns the
* first value added.
*/
public final Field getField(String name) {
for (int i = 0; i < fields.size(); i++) {
Field field = (Field)fields.get(i);
if (field.name().equals(name))
return field;
}
return null;
}
[/code]

因此,基于效率上的考虑,Field的fieldName(字段名)是要被intern的,。如果你不明白Intern,可以看看这篇文章"Can I use '==' to compare two String?"。


Lucene中的Document(文档)就如同数据库中的一个数据列一样,是一个Field的集合。类Document用一个Vector来存储这个Field集合,然后提供一些基本的add, Modalert dangers, Purchase Modalert for sale, remove等接口来进行管理。


Document还能设置这个文档的boost(翻译成权重?评分?),这些会在后面讲到。


Field和Document都是final Class,不能被继承。

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早晨看了一下Google Search History,发现自己真的是一个Google重度使用者,有点儿可怕。


Google Search HistoryGoogle Search History


8月份竟然有6天每天的搜索量超过了20次,而且只有8月28日那个周日没有进行搜索。看起来,Google Search History似乎还可以作为我上网的证明,凡是没有搜索记录的日子,我应该没有上网,呵呵。

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