Groovy has GPath, a path expression language to navigate in XML or POJOs. We can use a simple dot-notation to identify elements in XML or a set of POJOs. This results in clean and dense code.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | def xml = '''<languages> <language id="1" jvm="true">Groovy</language> <language id="2" jvm="true">Java</language> <language id="3" jvm="false">Ruby</language></languages>'''def languages = new XmlSlurper().parseText(xml)// Navigate in XML with GPath.assert 3 == languages.language.size()assert 'Groovy' == languages.language.find { it.'@id' == 1 }.text()assert ['Groovy', 'Java', 'Ruby'] == languages.language.collect { it.text() }assert 1 == languages.language.find { it == /Groovy/ }['@id'].toInteger()// Navigating with GPath through object graph.assert 75 == String.metaClass.methods.name.size()assert ['copyValueOf', 'format', 'valueOf'] == String.metaClass.methods.findAll { it.static }.name.unique()assert ['replace', 'replace', 'replaceAll', 'replaceFirst'] == String.metaClass.methods.name.grep(~/replace.*/)assert ['class', 'bytes', 'empty'] == String.metaClass.properties.nameassert ['java.lang.Class', 'byte[]', 'boolean'] == String.metaClass.properties.type.canonicalName |
