기본 XPath 조작 수행
XPath 표현식을 평가하기 위해 XFactory.prepareXPath 메소드를 사용하여 작성된 XPathExecutable 인스턴스를 사용할 수 있습니다.
이 태스크 정보
XPath 표현식은 JAXP StreamSource 오브젝트를 사용하거나 일반 Java™ 문자열 오브젝트를 사용하는 XFactory.prepareXPath 메소드로 전달할 수 있습니다. 결과로 생성된 XPathExecutable 인스턴스는 스레드 보안 처리되며, 이를 재사용하여 여러 XML 입력 문서에서 XPath 표현식을 평가할 수 있습니다.
프로시저
예
다음은
해석된 XPath 표현식을 준비 및 실행하는 기본 예제입니다.
// Create a string for the XPath expression
String expression = "/doc/something";
// Create the factory
XFactory factory = XFactory.newInstance();
// Create an XPath executable for the expression
XPathExecutable xPathExecutable = factory.prepareXPath(expression);
// Create the input XML source
String xml = "<doc><something>something is selected</something></doc>";
// Execute the expression and store the results in an XSequenceCursor
XSequenceCursor xSequenceCursor = xPathExecutable.execute(new StreamSource(new ByteArrayInputStream(xml.getBytes())));
다음은
컴파일된 XPath 표현식을 준비 및 실행하는 기본 예제입니다.
// Create a string for the XPath expression
String expression = "/doc/something";
// Create the factory
XFactory factory = XFactory.newInstance();
// Create a new static context from the factory
XStaticContext xStaticContext = factory.newStaticContext();
// Set the mode to compile for the processor
xStaticContext.setUseCompiler(true);
// Create an XPath executable for the expression
XPathExecutable xPathExecutable = factory.prepareXPath(expression, xStaticContext);
// Create the input XML source
String xml = "<doc><something>something is selected</something></doc>";
// Execute the expression and store the results in an XSequenceCursor
XSequenceCursor xSequenceCursor = xPathExecutable.execute(new StreamSource(new ByteArrayInputStream(xml.getBytes())));
다음은
스키마 유효성 검증을 포함하는 해석된 XPath 표현식을 준비 및 실행하는 기본 예제입니다.
// Create a string for the XPath expression
String expression = "/doc/byte cast as my:derived1-byte-enumeration-Type";
// Create the factory
XFactory factory = XFactory.newInstance();
// Create the schema source
String schema = "<xsd:schema xmlns:xsd='http://www.w3.org/2001/XMLSchema'" +
" targetNamespace='http://www.schematype.ibm.com/UDSimple'" +
" xmlns:my='http://www.schematype.ibm.com/UDSimple'" +
" xmlns:smokey='http://www.schematype.ibm.com/UDSimple'>"
+ " <xsd:simpleType name='derived1-byte-enumeration-Type'>"
+ " <xsd:restriction base='xsd:byte'>"
+ " <xsd:enumeration value='1' />"
+ " <xsd:enumeration value='-1' />"
+ " <xsd:enumeration value='0' />"
+ " <xsd:enumeration value='127' />"
+ " <xsd:enumeration value='-128' />"
+ " <xsd:enumeration value='32' />"
+ " <xsd:enumeration value='-32' />"
+ " <xsd:enumeration value='8' />"
+ " <xsd:enumeration value='-8' />"
+ " <xsd:enumeration value='2' />"
+ " <xsd:enumeration value='-2' />"
+ " </xsd:restriction>"
+ " </xsd:simpleType>"
+ "</xsd:schema>";
// Load schema
factory.registerSchema(new StreamSource(new ByteArrayInputStream(schema.getBytes())));
// Turn on validation
factory.setValidating(true);
// Create a new static context from the factory
XStaticContext xStaticContext = factory.newStaticContext();
// Add new namespace
xStaticContext.declareNamespace("my", "http://www.schematype.ibm.com/UDSimple");
// Create an XPath executable for the expression
XPathExecutable xPathExecutable = factory.prepareXPath(expression, xStaticContext);
// Create the input XML source
String xml = "<doc>" +
" <byte>1</byte>" +
"</doc>";
// Execute the expression and store the results in an XSequenceCursor
XSequenceCursor xSequenceCursor = xPathExecutable.execute(new StreamSource(new ByteArrayInputStream(xml.getBytes())));