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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.indexinglanguage.expressions;
import com.yahoo.document.DataType;
import com.yahoo.document.annotation.*;
import com.yahoo.document.datatypes.IntegerFieldValue;
import com.yahoo.document.datatypes.StringFieldValue;
import com.yahoo.language.Linguistics;
import com.yahoo.language.process.TokenType;
import com.yahoo.language.simple.SimpleLinguistics;
import com.yahoo.vespa.indexinglanguage.SimpleTestAdapter;
import org.junit.Test;
import org.mockito.Mockito;
import java.util.Iterator;
import static com.yahoo.vespa.indexinglanguage.expressions.ExpressionAssert.assertVerify;
import static com.yahoo.vespa.indexinglanguage.expressions.ExpressionAssert.assertVerifyThrows;
import static org.junit.Assert.*;
/**
* @author bratseth
*/
public class NGramTestCase {
@Test
public void requireThatAccessorsWork() {
Linguistics linguistics = new SimpleLinguistics();
NGramExpression exp = new NGramExpression(linguistics, 69);
assertSame(linguistics, exp.getLinguistics());
assertEquals(69, exp.getGramSize());
}
@Test
public void requireThatHashCodeAndEqualsAreImplemented() {
Linguistics linguistics = new SimpleLinguistics();
NGramExpression exp = new NGramExpression(linguistics, 69);
assertFalse(exp.equals(new Object()));
assertFalse(exp.equals(new NGramExpression(Mockito.mock(Linguistics.class), 96)));
assertFalse(exp.equals(new NGramExpression(linguistics, 96)));
assertEquals(exp, new NGramExpression(linguistics, 69));
assertEquals(exp.hashCode(), new NGramExpression(new SimpleLinguistics(), 69).hashCode());
}
@Test
public void requireThatExpressionCanBeVerified() {
Expression exp = new NGramExpression(new SimpleLinguistics(), 69);
assertVerify(DataType.STRING, exp, DataType.STRING);
assertVerifyThrows(null, exp, "Expected string input, but no input is specified");
assertVerifyThrows(DataType.INT, exp, "Expected string input, got int");
}
@Test
public void testNGrams() {
ExecutionContext context = new ExecutionContext(new SimpleTestAdapter());
context.setValue(new StringFieldValue("en gul Bille sang... "));
new NGramExpression(new SimpleLinguistics(), 3).execute(context);
StringFieldValue value = (StringFieldValue)context.getValue();
assertEquals("Grams are pure annotations - field value is unchanged", "en gul Bille sang... ",
value.getString());
SpanTree gramTree = value.getSpanTree(SpanTrees.LINGUISTICS);
assertNotNull(gramTree);
SpanList grams = (SpanList)gramTree.getRoot();
Iterator<SpanNode> i = grams.childIterator();
assertSpan(0, 2, true, i, gramTree); // en
assertSpan(2, 1, false, i, gramTree); // <space>
assertSpan(3, 3, true, i, gramTree); // gul
assertSpan(6, 1, false, i, gramTree); // <space>
assertSpan(7, 3, true, i, gramTree, "bil"); // Bil
assertSpan(8, 3, true, i, gramTree);
assertSpan(9, 3, true, i, gramTree);
assertSpan(12, 1, false, i, gramTree); // <space>
assertSpan(13, 3, true, i, gramTree);
assertSpan(14, 3, true, i, gramTree);
assertSpan(17, 4, false, i, gramTree); // <...space>
assertFalse(i.hasNext());
}
@Test
public void requireThatExecuteCanBeCalledMultipleTimes() {
ExecutionContext context = new ExecutionContext(new SimpleTestAdapter());
context.setValue(new StringFieldValue("some random text string"));
NGramExpression expression = new NGramExpression(new SimpleLinguistics(), 3);
expression.execute(context);
SpanTree firstTree = ((StringFieldValue)context.getValue()).getSpanTree(SpanTrees.LINGUISTICS);
assertNotNull(firstTree);
expression.execute(context);
SpanTree secondTree = ((StringFieldValue)context.getValue()).getSpanTree(SpanTrees.LINGUISTICS);
// The span tree instance should be the same.
assertEquals(firstTree, secondTree);
}
private void assertSpan(int from, int length, boolean gram, Iterator<SpanNode> i, SpanTree tree) {
assertSpan(from, length, gram, i, tree, null);
}
private void assertSpan(int from, int length, boolean gram, Iterator<SpanNode> i, SpanTree tree, String termValue) {
if (!i.hasNext()) {
fail("No more spans");
}
SpanNode gramSpan = i.next();
assertEquals("gram start", from, gramSpan.getFrom());
assertEquals("gram length", length, gramSpan.getLength());
assertTrue(gramSpan.isLeafNode());
Iterator<Annotation> annotations = tree.iterator(gramSpan);
Annotation typeAnnotation = annotations.next();
assertEquals(AnnotationTypes.TOKEN_TYPE, typeAnnotation.getType());
int typeInt = ((IntegerFieldValue)typeAnnotation.getFieldValue()).getInteger();
if (gram) {
assertEquals(TokenType.ALPHABETIC.getValue(), typeInt);
Annotation termAnnotation = annotations.next();
assertEquals(AnnotationTypes.TERM, termAnnotation.getType());
if (termValue == null) {
assertNull(termAnnotation.getFieldValue());
} else {
assertEquals(termValue, ((StringFieldValue)termAnnotation.getFieldValue()).getString());
}
} else { // gap between grams
assertEquals(TokenType.PUNCTUATION.getValue(), typeInt);
}
}
}
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