test/src/jdk/nashorn/api/scripting/test/JSONCompatibleTest.java

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package jdk.nashorn.api.scripting.test;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
import jdk.nashorn.api.scripting.JSObject;
import jdk.nashorn.api.scripting.NashornScriptEngine;
import jdk.nashorn.api.scripting.NashornScriptEngineFactory;
import org.testng.Assert;
import org.testng.annotations.Test;

public class JSONCompatibleTest {

    /**
     * Wrap a top-level array as a list.
     */
    @Test
    public void testWrapArray() throws ScriptException {
        final ScriptEngine engine = new NashornScriptEngineFactory().getScriptEngine();
        final Object val = engine.eval("Java.asJSONCompatible([1, 2, 3])");
        assertEquals(asList(val), Arrays.asList(1, 2, 3));
    }

    /**
     * Wrap an embedded array as a list.
     */
    @Test
    public void testWrapObjectWithArray() throws ScriptException {
        final ScriptEngine engine = new NashornScriptEngineFactory().getScriptEngine();
        final Object val = engine.eval("Java.asJSONCompatible({x: [1, 2, 3]})");
        assertEquals(asList(asMap(val).get("x")), Arrays.asList(1, 2, 3));
    }

    /**
     * Check it all works transitively several more levels down.
     */
    @Test
    public void testDeepWrapping() throws ScriptException {
        final ScriptEngine engine = new NashornScriptEngineFactory().getScriptEngine();
        final Object val = engine.eval("Java.asJSONCompatible({x: [1, {y: [2, {z: [3]}]}, [4, 5]]})");
        final Map<String, Object> root = asMap(val);
        final List<Object> x = asList(root.get("x"));
        assertEquals(x.get(0), 1);
        final Map<String, Object> x1 = asMap(x.get(1));
        final List<Object> y = asList(x1.get("y"));
        assertEquals(y.get(0), 2);
        final Map<String, Object> y1 = asMap(y.get(1));
        assertEquals(asList(y1.get("z")), Arrays.asList(3));
        assertEquals(asList(x.get(2)), Arrays.asList(4, 5));
    }

    /**
     * Ensure that the old behaviour (every object is a Map) is unchanged.
     */
    @Test
    public void testNonWrapping() throws ScriptException {
        final ScriptEngine engine = new NashornScriptEngineFactory().getScriptEngine();
        final Object val = engine.eval("({x: [1, {y: [2, {z: [3]}]}, [4, 5]]})");
        final Map<String, Object> root = asMap(val);
        final Map<String, Object> x = asMap(root.get("x"));
        assertEquals(x.get("0"), 1);
        final Map<String, Object> x1 = asMap(x.get("1"));
        final Map<String, Object> y = asMap(x1.get("y"));
        assertEquals(y.get("0"), 2);
        final Map<String, Object> y1 = asMap(y.get("1"));
        final Map<String, Object> z = asMap(y1.get("z"));
        assertEquals(z.get("0"), 3);
        final Map<String, Object> x2 = asMap(x.get("2"));
        assertEquals(x2.get("0"), 4);
        assertEquals(x2.get("1"), 5);
    }

    @SuppressWarnings("unchecked")
    private static List<Object> asList(final Object obj) {
        assertJSObject(obj);
        Assert.assertTrue(obj instanceof List);
        return (List)obj;
    }

    @SuppressWarnings("unchecked")
    private static Map<String, Object> asMap(final Object obj) {
        assertJSObject(obj);
        Assert.assertTrue(obj instanceof Map);
        return (Map)obj;
    }

    private static void assertJSObject(final Object obj) {
        assertTrue(obj instanceof JSObject);
    }
}