domreadertest.java

xstream是一个把java object序列化成xml文件的开源库,轻便好用

package com.thoughtworks.xstream.io.xml;

import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.ByteArrayInputStream;
import java.util.HashMap;
import java.util.Map;

public class DomReaderTest extends AbstractXMLReaderTest {

    // factory method
    protected HierarchicalStreamReader createReader(String xml) throws Exception {
        return new DomReader(buildDocument(xml));
    }

    private Document buildDocument(String xml) throws Exception {
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
        ByteArrayInputStream inputStream = new ByteArrayInputStream(xml.getBytes());
        Document document = documentBuilder.parse(inputStream);
        return document;
    }

    public void testCanReadFromElementOfLargerDocument() throws Exception {
        Document document = buildDocument("" +
                "<big>" +
                "  <small>" +
                "    <tiny/>" +
                "  </small>" +
                "  <small-two>" +
                "  </small-two>" +
                "</big>");
        Element small = (Element) document.getDocumentElement().getElementsByTagName("small").item(0);

        HierarchicalStreamReader xmlReader = new DomReader(small);
        assertEquals("small", xmlReader.getNodeName());
        xmlReader.moveDown();
        assertEquals("tiny", xmlReader.getNodeName());
    }

    public void testExposesAttributesKeysAndValuesByIndex() throws Exception {

        // overrides test in superclass, because DOM does not retain order of actualAttributes.

        HierarchicalStreamReader xmlReader = createReader("<node hello='world' a='b' c='d'><empty/></node>");

        assertEquals(3, xmlReader.getAttributeCount());

        Map expectedAttributes = new HashMap();
        expectedAttributes.put("hello", "world");
        expectedAttributes.put("a", "b");
        expectedAttributes.put("c", "d");

        Map actualAttributes = new HashMap();
        for (int i = 0; i < xmlReader.getAttributeCount(); i++) {
            String name = xmlReader.getAttributeName(i);
            String value = xmlReader.getAttribute(i);
            actualAttributes.put(name, value);
        }

        assertEquals(expectedAttributes, actualAttributes);

        xmlReader.moveDown();
        assertEquals("empty", xmlReader.getNodeName());
        assertEquals(0, xmlReader.getAttributeCount());
    }

}