ExpressionTests.java example

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package org.elasticsearch.script.expression;

import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.script.CompiledScript;
import org.elasticsearch.script.ScriptService.ScriptType;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.lookup.SearchLookup;
import org.elasticsearch.test.ESSingleNodeTestCase;

import java.util.Collections;

public class ExpressionTests extends ESSingleNodeTestCase {

    public void testNeedsScores() {
        IndexService index = createIndex("test", Settings.EMPTY, "type", "d", "type=double");

        ExpressionScriptEngineService service = new ExpressionScriptEngineService(Settings.EMPTY);
        SearchLookup lookup = new SearchLookup(index.mapperService(), index.fieldData(), null);

        Object compiled = service.compile("1.2", Collections.<String, String>emptyMap());
        SearchScript ss = service.search(new CompiledScript(ScriptType.INLINE, "randomName", "expression", compiled), lookup, Collections.<String, Object>emptyMap());
        assertFalse(ss.needsScores());

        compiled = service.compile("doc['d'].value", Collections.<String, String>emptyMap());
        ss = service.search(new CompiledScript(ScriptType.INLINE, "randomName", "expression", compiled), lookup, Collections.<String, Object>emptyMap());
        assertFalse(ss.needsScores());

        compiled = service.compile("1/_score", Collections.<String, String>emptyMap());
        ss = service.search(new CompiledScript(ScriptType.INLINE, "randomName", "expression", compiled), lookup, Collections.<String, Object>emptyMap());
        assertTrue(ss.needsScores());

        compiled = service.compile("doc['d'].value * _score", Collections.<String, String>emptyMap());
        ss = service.search(new CompiledScript(ScriptType.INLINE, "randomName", "expression", compiled), lookup, Collections.<String, Object>emptyMap());
        assertTrue(ss.needsScores());
    }

}