#pragma section-numbers off
[[TableOfContents]]

= 概要 =
JavaBeans、Maps、サーブレットコンテキスト、DOMをXPathの仕様にしたがって取得できる。

非常に強力でおもしろい。SQLすきな人にもうけるかもしれない。

= URL =
http://jakarta.apache.org/commons/jxpath/

[http://jakarta.terra-intl.com/commons/jxpath/ JXPath翻訳]

= インストールと動作確認 =
jarをクラスパスのある場所におく。

commons-jxpath-1.1.jarを基に解説する。

testを動作させてみるとよい。

ソースからコンパイルする場合は["Maven"]を利用するなら
{{{
maven dist
}}}
ですべてが一括で作成されて便利です。

= 利用方法 =
というか[http://jakarta.terra-intl.com/commons/jxpath/users-guide.html ユーザガイド]読めばたいがいわかると思います。

== JavaBean Property Access ==

{{{
JXpathSample.java

public class JXpathSample {
    public String getTitle() {
        return "title";
    }

    public String[] getAuthorName() {
        String author[] = {"sakito", "python", "emacs"};
        return author;
    }
}
}}}


{{{
UseSample.java

import org.apache.commons.jxpath.*;
public class UseSample {
    public static void main(String[] args) {
        JXpathSample path = new JXpathSample();
        JXPathContext context = JXPathContext.newContext(path);
        String title = (String) context.getValue("title");
        System.out.println(title);

        // XPathの仕様では最初が1になります。
        String author1 = (String) context.getValue("authorName[1]");
        String author2 = (String) context.getValue("authorName[2]");
        String author3 = (String) context.getValue("authorName[3]");
        System.out.println(author1);
        System.out.println(author2);
        System.out.println(author3);

        // 存在しない値にアクセスすると、JXPathExceptionが発生します。
        //String author4 = (String) context.getValue("authorName[4]");

        // 配列などの複値の場合はiterateで取ります。
        Iterator authors = context.iterate("authorName[position() > 0]");
        for (;authors.hasNext();) {
            System.out.println(authors.next());
        }
    }
}
}}}

== Nested Bean Property Access ==
{{{
Author.java

public class Author {

    private String name;

    public Author(String name) {
        this.name = name;
    }

    public String getName() {
        return this.name;
    }
}
}}}

{{{
JXpathSample.javaに追加

public Author getAuthor() {
    Author author = new Author("sakito");
    return author;
}
}}}

{{{
UseSample.javaに追加

String name = (String) context.getValue("author/name");
System.out.println(name);
}}}

== Map Element Access ==
{{{
Author.javaに追加

public Map getAuthorInfo() {
    Map info = new HashMap();
    info.put("address", "toukyo japan");
    info.put("tel", "03-xxxx-xxxx");
    return info;
}
}}}

{{{
UseSample.javaに追加

// 文法1
String tel = (String) context.getValue("author/authorInfo/tel");
System.out.println(tel);

// 文法2
String address = (String) context.getValue("author[@name='authorInfo']/address");
System.out.println(address);

// この例ではどちらでも問題ないですが、どちらを利用するかは場合によります。
// XPathの仕様を参照してください。
}}}

= Setting Properties =
値の変更も可能です。

{{{
JxpathSample.javaに追加

private String price;
public String getPrice() {
    return this.price;
}

public void setPrice(String price) {
    this.price = price;
}
}}}

{{{
UseSample.java

context.setValue("price", "2000");
String price = (String) context.getValue("price");
System.out.println(price);

context.setValue("price", "3000");
price = (String) context.getValue("price");
System.out.println(price);
}}}

= 参考サイト =
日本語のサイトはJakartaの杜の翻訳以外には今ないかも。

ってか強力なのでおそらく秘密です。

公開しないで利用してるのではなかろうか？

----
CategoryJava
CategoryXml
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