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Added methods U.selectToken(map, expression) and U.selectTokens(map, expression).
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+250
-2
lines changed

4 files changed

+250
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lines changed

‎README.md‎

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@@ -181,6 +181,80 @@ System.out.println(builder.toXml());
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</root>
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```
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```java
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String inventory =
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"{\n"
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+ " \"inventory\": {\n"
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+ " \"#comment\": \"Test is test comment\",\n"
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+ " \"book\": [\n"
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+ " {\n"
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+ " \"-year\": \"2000\",\n"
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+ " \"title\": \"Snow Crash\",\n"
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+ " \"author\": \"Neal Stephenson\",\n"
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+ " \"publisher\": \"Spectra\",\n"
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+ " \"isbn\": \"0553380958\",\n"
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+ " \"price\": \"14.95\"\n"
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+ " },\n"
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+ " {\n"
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+ " \"-year\": \"2005\",\n"
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+ " \"title\": \"Burning Tower\",\n"
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+ " \"author\": [\n"
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+ " \"Larry Niven\",\n"
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+ " \"Jerry Pournelle\"\n"
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+ " ],\n"
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+ " \"publisher\": \"Pocket\",\n"
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+ " \"isbn\": \"0743416910\",\n"
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+ " \"price\": \"5.99\"\n"
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+ " },\n"
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+ " {\n"
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+ " \"-year\": \"1995\",\n"
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+ " \"title\": \"Zodiac\",\n"
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+ " \"author\": \"Neal Stephenson\",\n"
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+ " \"publisher\": \"Spectra\",\n"
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+ " \"isbn\": \"0553573862\",\n"
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+ " \"price\": \"7.50\"\n"
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+ " }\n"
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+ " ]\n"
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+ " }\n"
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+ "}";
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String title = U.selectToken(U.fromJsonMap(inventory), "//book[@year>2001]/title/text()");
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// "Burning Tower"
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String json =
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"{\n"
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+ " \"Stores\": [\n"
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+ " \"Lambton Quay\",\n"
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+ " \"Willis Street\"\n"
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+ " ],\n"
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+ " \"Manufacturers\": [\n"
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+ " {\n"
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+ " \"Name\": \"Acme Co\",\n"
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+ " \"Products\": [\n"
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+ " {\n"
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+ " \"Name\": \"Anvil\",\n"
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+ " \"Price\": 50\n"
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+ " }\n"
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+ " ]\n"
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+ " },\n"
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+ " {\n"
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+ " \"Name\": \"Contoso\",\n"
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+ " \"Products\": [\n"
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+ " {\n"
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+ " \"Name\": \"Elbow Grease\",\n"
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+ " \"Price\": 99.95\n"
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+ " },\n"
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+ " {\n"
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+ " \"Name\": \"Headlight Fluid\",\n"
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+ " \"Price\": 4\n"
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+ " }\n"
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+ " ]\n"
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+ " }\n"
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+ " ]\n"
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+ "}";
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List<String> names = U.selectTokens(U.fromJsonMap(json), "//Products[Price>=50]/Name/text()");
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// [Anvil, Elbow Grease]
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```
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Underscore-java is a java port of [Underscore.js](https://underscorejs.org/).
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In addition to porting Underscore's functionality, Underscore-java includes matching unit tests.

‎src/main/java/com/github/underscore/U.java‎

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@@ -53,6 +53,10 @@
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.zip.GZIPInputStream;
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import javax.xml.xpath.XPath;
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import javax.xml.xpath.XPathConstants;
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import javax.xml.xpath.XPathFactory;
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import org.w3c.dom.NodeList;
5660

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@SuppressWarnings({
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"java:S135",
@@ -1785,6 +1789,40 @@ public static <T> T get(final Map<String, Object> object, final List<String> pat
17851789
return baseGetOrSetOrRemove(object, paths, null, OperationType.GET);
17861790
}
17871791

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public static String selectToken(final Map<String, Object> object, final String expression) {
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final String xml = toXml(object);
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try {
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final XPath xPath = XPathFactory.newInstance().newXPath();
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final org.w3c.dom.Document document = Xml.Document.createDocument(xml);
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final NodeList nodes =
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(NodeList) xPath.compile(expression).evaluate(document, XPathConstants.NODESET);
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if (nodes.getLength() == 0) {
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return null;
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}
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return nodes.item(0).getNodeValue();
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} catch (Exception ex) {
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throw new IllegalArgumentException(ex);
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}
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}
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1808+
public static List<String> selectTokens(
1809+
final Map<String, Object> object, final String expression) {
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final String xml = toXml(object);
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try {
1812+
final XPath xPath = XPathFactory.newInstance().newXPath();
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final org.w3c.dom.Document document = Xml.Document.createDocument(xml);
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final NodeList nodes =
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(NodeList) xPath.compile(expression).evaluate(document, XPathConstants.NODESET);
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final List<String> result = new ArrayList<>();
1817+
for (int i = 0; i < nodes.getLength(); i++) {
1818+
result.add(nodes.item(i).getNodeValue());
1819+
}
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return result;
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} catch (Exception ex) {
1822+
throw new IllegalArgumentException(ex);
1823+
}
1824+
}
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17881826
public static <T> T set(final Map<String, Object> object, final String path, Object value) {
17891827
return set(object, stringToPath(path), value);
17901828
}

‎src/main/java/com/github/underscore/Xml.java‎

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@@ -1776,8 +1776,10 @@ public org.xml.sax.InputSource resolveEntity(String publicId, String systemId) {
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}
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}
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1779-
private static class Document {
1780-
private static org.w3c.dom.Document createDocument(final String xml)
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protected static class Document {
1780+
private Document() {}
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public static org.w3c.dom.Document createDocument(final String xml)
17811783
throws java.io.IOException, javax.xml.parsers.ParserConfigurationException,
17821784
org.xml.sax.SAXException {
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final javax.xml.parsers.DocumentBuilderFactory factory =

‎src/test/java/com/github/underscore/LodashTest.java‎

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@@ -471,6 +471,140 @@ void getNotFound() {
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"a[0].d.c"));
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}
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@Test
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void selectTokenGetBookTitleWrittenAfter2001() {
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String inventory =
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"{\n"
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+ " \"inventory\": {\n"
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+ " \"#comment\": \"Test is test comment\",\n"
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+ " \"book\": [\n"
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+ " {\n"
482+
+ " \"-year\": \"2000\",\n"
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+ " \"title\": \"Snow Crash\",\n"
484+
+ " \"author\": \"Neal Stephenson\",\n"
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+ " \"publisher\": \"Spectra\",\n"
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+ " \"isbn\": \"0553380958\",\n"
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+ " \"price\": \"14.95\"\n"
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+ " },\n"
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+ " {\n"
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+ " \"-year\": \"2005\",\n"
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+ " \"title\": \"Burning Tower\",\n"
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+ " \"author\": [\n"
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+ " \"Larry Niven\",\n"
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+ " \"Jerry Pournelle\"\n"
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+ " ],\n"
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+ " \"publisher\": \"Pocket\",\n"
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+ " \"isbn\": \"0743416910\",\n"
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+ " \"price\": \"5.99\"\n"
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+ " },\n"
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+ " {\n"
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+ " \"-year\": \"1995\",\n"
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+ " \"title\": \"Zodiac\",\n"
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+ " \"author\": \"Neal Stephenson\",\n"
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+ " \"publisher\": \"Spectra\",\n"
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+ " \"isbn\": \"0553573862\",\n"
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+ " \"price\": \"7.50\"\n"
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+ " }\n"
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+ " ]\n"
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+ " }\n"
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+ "}";
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Map<String, Object> objectMap = U.fromJsonMap(inventory);
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assertEquals("Burning Tower", U.selectToken(objectMap, "//book[@year>2001]/title/text()"));
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assertNull(U.selectToken(objectMap, "//book[@year>2001]/title1/text()"));
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assertThrows(IllegalArgumentException.class, () -> U.selectToken(objectMap, "\\"));
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}
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@Test
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void selectTokenManufacturerWithName() {
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String json =
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"{\n"
521+
+ " \"Stores\": [\n"
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+ " \"Lambton Quay\",\n"
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+ " \"Willis Street\"\n"
524+
+ " ],\n"
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+ " \"Manufacturers\": [\n"
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+ " {\n"
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+ " \"Name\": \"Acme Co\",\n"
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+ " \"Products\": [\n"
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+ " {\n"
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+ " \"Name\": \"Anvil\",\n"
531+
+ " \"Price\": 50\n"
532+
+ " }\n"
533+
+ " ]\n"
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+ " },\n"
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+ " {\n"
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+ " \"Name\": \"Contoso\",\n"
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+ " \"Products\": [\n"
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+ " {\n"
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+ " \"Name\": \"Elbow Grease\",\n"
540+
+ " \"Price\": 99.95\n"
541+
+ " },\n"
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+ " {\n"
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+ " \"Name\": \"Headlight Fluid\",\n"
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+ " \"Price\": 4\n"
545+
+ " }\n"
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+ " ]\n"
547+
+ " }\n"
548+
+ " ]\n"
549+
+ "}";
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Map<String, Object> objectMap = U.fromJsonMap(json);
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assertEquals(
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"Anvil",
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U.selectToken(objectMap, "//Manufacturers[Name='Acme Co']/Products/Name/text()"));
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assertEquals(
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"50",
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U.selectToken(objectMap, "//Manufacturers[Name='Acme Co']/Products/Price/text()"));
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assertEquals("Anvil", U.selectToken(objectMap, "//Products[Price>=50]/Name/text()"));
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assertEquals(
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Arrays.asList("Anvil", "Elbow Grease"),
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U.selectTokens(objectMap, "//Products[Price>=50]/Name/text()"));
561+
}
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@Test
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void selectTokensGetAllWriters() {
565+
String inventory =
566+
"{\n"
567+
+ " \"inventory\": {\n"
568+
+ " \"#comment\": \"Test is test comment\",\n"
569+
+ " \"book\": [\n"
570+
+ " {\n"
571+
+ " \"-year\": \"2000\",\n"
572+
+ " \"title\": \"Snow Crash\",\n"
573+
+ " \"author\": \"Neal Stephenson\",\n"
574+
+ " \"publisher\": \"Spectra\",\n"
575+
+ " \"isbn\": \"0553380958\",\n"
576+
+ " \"price\": \"14.95\"\n"
577+
+ " },\n"
578+
+ " {\n"
579+
+ " \"-year\": \"2005\",\n"
580+
+ " \"title\": \"Burning Tower\",\n"
581+
+ " \"author\": [\n"
582+
+ " \"Larry Niven\",\n"
583+
+ " \"Jerry Pournelle\"\n"
584+
+ " ],\n"
585+
+ " \"publisher\": \"Pocket\",\n"
586+
+ " \"isbn\": \"0743416910\",\n"
587+
+ " \"price\": \"5.99\"\n"
588+
+ " },\n"
589+
+ " {\n"
590+
+ " \"-year\": \"1995\",\n"
591+
+ " \"title\": \"Zodiac\",\n"
592+
+ " \"author\": \"Neal Stephenson\",\n"
593+
+ " \"publisher\": \"Spectra\",\n"
594+
+ " \"isbn\": \"0553573862\",\n"
595+
+ " \"price\": \"7.50\"\n"
596+
+ " }\n"
597+
+ " ]\n"
598+
+ " }\n"
599+
+ "}";
600+
Map<String, Object> objectMap = U.fromJsonMap(inventory);
601+
assertEquals(
602+
"[Neal Stephenson, Larry Niven, Jerry Pournelle, Neal Stephenson]",
603+
U.selectTokens(objectMap, "//book/author/text()").toString());
604+
assertEquals("[]", U.selectTokens(objectMap, "//book/author1/text()").toString());
605+
assertThrows(IllegalArgumentException.class, () -> U.selectTokens(objectMap, "\\"));
606+
}
607+
474608
@SuppressWarnings("unchecked")
475609
@Test
476610
void fetchGet() {

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