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package com.yahoo.document.json;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.yahoo.document.json.TokenBuffer.Token;
import org.junit.Test;
import java.io.IOException;
import java.util.function.Supplier;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
/**
* @author jonmv
*/
public class LazyTokenBufferTest {
@Test
public void testBuffer() throws IOException {
String json = """
{
"fields": {
"foo": "bar",
"baz": [1, 2, 3],
"quu": { "qux": null }
}
}""";
JsonParser parser = new JsonFactory().createParser(json);
parser.nextValue();
parser.nextValue();
assertEquals(JsonToken.START_OBJECT, parser.currentToken());
assertEquals("fields", parser.currentName());
// Peeking through the buffer doesn't change nesting.
LazyTokenBuffer buffer = new LazyTokenBuffer(parser);
assertEquals(JsonToken.START_OBJECT, buffer.current());
assertEquals("fields", buffer.currentName());
assertEquals(1, buffer.nesting());
Supplier<Token> lookahead = buffer.lookahead();
Token peek = lookahead.get();
assertEquals(JsonToken.VALUE_STRING, peek.token);
assertEquals("foo", peek.name);
assertEquals("bar", peek.text);
assertEquals(1, buffer.nesting());
peek = lookahead.get();
assertEquals(JsonToken.START_ARRAY, peek.token);
assertEquals("baz", peek.name);
assertEquals(1, buffer.nesting());
peek = lookahead.get();
assertEquals(JsonToken.VALUE_NUMBER_INT, peek.token);
assertEquals("1", peek.text);
peek = lookahead.get();
assertEquals(JsonToken.VALUE_NUMBER_INT, peek.token);
assertEquals("2", peek.text);
peek = lookahead.get();
assertEquals(JsonToken.VALUE_NUMBER_INT, peek.token);
assertEquals("3", peek.text);
peek = lookahead.get();
assertEquals(JsonToken.END_ARRAY, peek.token);
assertEquals(1, buffer.nesting());
peek = lookahead.get();
assertEquals(JsonToken.START_OBJECT, peek.token);
assertEquals("quu", peek.name);
assertEquals(1, buffer.nesting());
peek = lookahead.get();
assertEquals(JsonToken.VALUE_NULL, peek.token);
assertEquals("qux", peek.name);
peek = lookahead.get();
assertEquals(JsonToken.END_OBJECT, peek.token);
assertEquals(1, buffer.nesting());
peek = lookahead.get();
assertEquals(JsonToken.END_OBJECT, peek.token);
assertEquals(1, buffer.nesting());
peek = lookahead.get();
assertNull(peek);
// Parser is now at the end.
assertEquals(JsonToken.END_OBJECT, parser.nextToken());
assertNull(parser.nextToken());
// Repeat iterating through the buffer, this time advancing it, and see that nesting changes.
assertEquals(JsonToken.VALUE_STRING, buffer.next());
assertEquals("foo", buffer.currentName());
assertEquals("bar", buffer.currentText());
assertEquals(1, buffer.nesting());
assertEquals(JsonToken.START_ARRAY, buffer.next());
assertEquals("baz", buffer.currentName());
assertEquals(2, buffer.nesting());
assertEquals(JsonToken.VALUE_NUMBER_INT, buffer.next());
assertEquals("1", buffer.currentText());
assertEquals(JsonToken.VALUE_NUMBER_INT, buffer.next());
assertEquals("2", buffer.currentText());
assertEquals(JsonToken.VALUE_NUMBER_INT, buffer.next());
assertEquals("3", buffer.currentText());
assertEquals(JsonToken.END_ARRAY, buffer.next());
assertEquals(1, buffer.nesting());
assertEquals(JsonToken.START_OBJECT, buffer.next());
assertEquals("quu", buffer.currentName());
assertEquals(2, buffer.nesting());
assertEquals(JsonToken.VALUE_NULL, buffer.next());
assertEquals("qux", buffer.currentName());
assertEquals(JsonToken.END_OBJECT, buffer.next());
assertEquals(1, buffer.nesting());
assertEquals(JsonToken.END_OBJECT, buffer.next());
assertEquals(0, buffer.nesting());
assertNull(buffer.next());
}
}
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