Examples of org.jdom.xpath.XPath.selectSingleNode()

org.jdom.xpath.XPath.selectSingleNode()
Evaluates the wrapped XPath expression and returns the first entry in the list of selected nodes (or atomics). @param context the node to use as context for evaluatingthe XPath expression. @return the first selected item, which may be of types: {@link Element}, {@link Attribute}, {@link Text}, {@link CDATA}, {@link Comment}, {@link ProcessingInstruction}, Boolean, Double, String, or null if no item was selected. @throws JDOMException if the evaluation of the XPathexpression on the specified context failed.

     *   such element exists
     * @throws JDOMException
     */
  public Element getFormWithName(Element elt, String formName) throws JDOMException {
    XPath xpath = getXPath("xhtml", String.format(".//xhtml:form[@name='%s']", formName));
    return (Element)xpath.selectSingleNode(elt);
  }


    /**
     * Find in the given XML document a &lt;form&gt;
     * tag with the given @name attribute.

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      List<NameValuePair> keyvals)
      throws JDOMException {
    String selectName = select.getAttributeValue("name");
    String expr = String.format("//xhtml:option[@value='%s']",chosenValue);
    XPath optionPath = XhtmlParser.getXPath("xhtml", expr);
    if (optionPath.selectSingleNode(select) == null) {
      String msg = String.format("value '%s' was not one of the available options for select '%s'",
                    chosenValue, selectName);
      throw new IllegalArgumentException(msg);
    }
    keyvals.add(new BasicNameValuePair(selectName, chosenValue));

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  private void addDefaultOption(Element select, List<NameValuePair> keyvals) 
      throws JDOMException {
    String selectName = select.getAttributeValue("name");
    XPath defaultPath = XhtmlParser.getXPath("xhtml","//xhtml:option[@selected]");
    Element defaultOption = (Element)defaultPath.selectSingleNode(select);
    if (defaultOption != null) {
      keyvals.add(new BasicNameValuePair(selectName, defaultOption.getAttributeValue("value","")));
    }
  }

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    }


    private Element getMatch(Object doc, String xpath) {
        try {
            XPath path = XPath.newInstance(xpath);
            return (Element)path.selectSingleNode(doc);
        } catch (JDOMException e) {
            throw new DatabindingException("Error evaluating xpath " + xpath, e);
        }
    }

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        final XPath hint = XPath.newInstance( "//component[position()=1]/role-hint/text()" );
        final XPath implementation = XPath.newInstance( "//component[position()=1]/implementation/text()" );


        assertEquals( "role", ( (Text) role.selectSingleNode( doc ) ).getText() );
        assertNull( hint.selectSingleNode( doc ) );
        assertEquals( "impl", ( (Text) implementation.selectSingleNode( doc ) ).getText() );
    }


    public void testAddToArchive_ShouldWriteComponentWithHintToFile()
        throws IOException, ArchiverException, JDOMException
    {

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        final XPath hint = XPath.newInstance( "//component[position()=1]/role-hint/text()" );
        final XPath implementation = XPath.newInstance( "//component[position()=1]/implementation/text()" );


        assertEquals( "role", ( (Text) role.selectSingleNode( doc ) ).getText() );
        assertEquals( "hint", ( (Text) hint.selectSingleNode( doc ) ).getText() );
        assertEquals( "impl", ( (Text) implementation.selectSingleNode( doc ) ).getText() );
    }


    public void testAddToArchive_ShouldWriteTwoComponentToFile()
        throws IOException, ArchiverException, JDOMException
    {

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        final XPath hint = XPath.newInstance( "//component[position()=1]/role-hint/text()" );
        final XPath implementation = XPath.newInstance( "//component[position()=1]/implementation/text()" );


        assertEquals( "role", ( (Text) role.selectSingleNode( doc ) ).getText() );
        assertEquals( "hint", ( (Text) hint.selectSingleNode( doc ) ).getText() );
        assertEquals( "impl", ( (Text) implementation.selectSingleNode( doc ) ).getText() );


        final XPath role2 = XPath.newInstance( "//component[position()=2]/role/text()" );
        final XPath hint2 = XPath.newInstance( "//component[position()=2]/role-hint/text()" );
        final XPath implementation2 = XPath.newInstance( "//component[position()=2]/implementation/text()" );

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        final XPath hint2 = XPath.newInstance( "//component[position()=2]/role-hint/text()" );
        final XPath implementation2 = XPath.newInstance( "//component[position()=2]/implementation/text()" );


        assertEquals( "role", ( (Text) role2.selectSingleNode( doc ) ).getText() );
        assertEquals( "hint2", ( (Text) hint2.selectSingleNode( doc ) ).getText() );
        assertEquals( "impl", ( (Text) implementation2.selectSingleNode( doc ) ).getText() );


    }


    public void testAddToArchive_ShouldWriteTwoComponentToArchivedFile()
        throws IOException, ArchiverException, JDOMException

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        final XPath hint = XPath.newInstance( "//component[position()=1]/role-hint/text()" );
        final XPath implementation = XPath.newInstance( "//component[position()=1]/implementation/text()" );


        assertEquals( "role", ( (Text) role.selectSingleNode( doc ) ).getText() );
        assertEquals( "hint", ( (Text) hint.selectSingleNode( doc ) ).getText() );
        assertEquals( "impl", ( (Text) implementation.selectSingleNode( doc ) ).getText() );


        final XPath role2 = XPath.newInstance( "//component[position()=2]/role/text()" );
        final XPath hint2 = XPath.newInstance( "//component[position()=2]/role-hint/text()" );
        final XPath implementation2 = XPath.newInstance( "//component[position()=2]/implementation/text()" );

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        final XPath hint2 = XPath.newInstance( "//component[position()=2]/role-hint/text()" );
        final XPath implementation2 = XPath.newInstance( "//component[position()=2]/implementation/text()" );


        assertEquals( "role", ( (Text) role2.selectSingleNode( doc ) ).getText() );
        assertEquals( "hint2", ( (Text) hint2.selectSingleNode( doc ) ).getText() );
        assertEquals( "impl", ( (Text) implementation2.selectSingleNode( doc ) ).getText() );


    }


    private Xpp3Dom createComponentDom( final ComponentDef def )
    {

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