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LocationOffsetsTest.java
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LocationOffsetsTest.java
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package com.fasterxml.jackson.core.read;
import com.fasterxml.jackson.core.*;
import java.io.IOException;
import java.util.Random;
public class LocationOffsetsTest extends com.fasterxml.jackson.core.BaseTest
{
final JsonFactory JSON_F = new JsonFactory();
// Trivially simple unit test for basics wrt offsets
public void testSimpleInitialOffsets() throws Exception
{
JsonLocation loc;
JsonParser p;
final String DOC = "{ }";
// first, char based:
p = JSON_F.createParser(DOC);
assertToken(JsonToken.START_OBJECT, p.nextToken());
loc = p.getTokenLocation();
assertEquals(-1L, loc.getByteOffset());
assertEquals(0L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(1, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(-1L, loc.getByteOffset());
assertEquals(1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(2, loc.getColumnNr());
p.close();
// then byte-based
p = JSON_F.createParser(DOC.getBytes("UTF-8"));
assertToken(JsonToken.START_OBJECT, p.nextToken());
loc = p.getTokenLocation();
assertEquals(0L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(1, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(1L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(2, loc.getColumnNr());
p.close();
}
// for [core#111]
public void testOffsetWithInputOffset() throws Exception
{
JsonLocation loc;
JsonParser p;
// 3 spaces before, 2 after, just for padding
byte[] b = " { } ".getBytes("UTF-8");
// and then peel them off
p = JSON_F.createParser(b, 3, b.length-5);
assertToken(JsonToken.START_OBJECT, p.nextToken());
loc = p.getTokenLocation();
assertEquals(0L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(1, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(1L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(2, loc.getColumnNr());
p.close();
}
public void testOffsetWithoutInputOffset() throws Exception
{
JsonLocation loc;
JsonParser p;
// 3 spaces before, 2 after, just for padding
byte[] b = " { } ".getBytes("UTF-8");
// and then peel them off
p = JSON_F.createParser(b);
assertToken(JsonToken.START_OBJECT, p.nextToken());
loc = p.getTokenLocation();
assertEquals(3L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(4, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(4L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(5, loc.getColumnNr());
p.close();
}
public void testWithLazyStringReadStreaming() throws Exception
{
_testWithLazyStringRead(MODE_READER);
_testWithLazyStringRead(MODE_INPUT_STREAM);
}
public void testWithLazyStringReadDataInput() throws Exception
{
// DataInput-backed reader does not track column, so can not
// verify much; but force finishToken() regardless
JsonParser p = createParser(JSON_F, MODE_DATA_INPUT, "[\"text\"]");
assertToken(JsonToken.START_ARRAY, p.nextToken());
assertToken(JsonToken.VALUE_STRING, p.nextToken());
assertEquals(1, p.getCurrentLocation().getLineNr());
p.finishToken();
assertEquals("text", p.getText());
p.close();
}
private void _testWithLazyStringRead(int readMode) throws Exception
{
JsonParser p = createParser(JSON_F, readMode, "[\"text\"]");
assertToken(JsonToken.START_ARRAY, p.nextToken());
assertToken(JsonToken.VALUE_STRING, p.nextToken());
// initially location pointing to first character
assertEquals(3, p.getCurrentLocation().getColumnNr());
p.finishToken();
// but will move once we force reading
assertEquals(8, p.getCurrentLocation().getColumnNr());
// and no change if we call again (but is ok to call)
p.finishToken();
assertEquals(8, p.getCurrentLocation().getColumnNr());
// also just for fun, verify content
assertEquals("text", p.getText());
assertEquals(8, p.getCurrentLocation().getColumnNr());
p.close();
}
// for [core#533]
public void testUtf8Bom() throws Exception
{
JsonLocation loc;
JsonParser p;
byte[] b = withUtf8Bom("{ }".getBytes());
// and then peel them off
p = JSON_F.createParser(b);
assertToken(JsonToken.START_OBJECT, p.nextToken());
loc = p.getTokenLocation();
assertEquals(3L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(4, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(4L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(5, loc.getColumnNr());
p.close();
}
public void testUtf8BomWithPadding() throws Exception
{
JsonLocation loc;
JsonParser p;
byte[] b = withUtf8Bom(" { }".getBytes());
// and then peel them off
p = JSON_F.createParser(b);
assertToken(JsonToken.START_OBJECT, p.nextToken());
loc = p.getTokenLocation();
assertEquals(6L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(7, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(7L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(8, loc.getColumnNr());
p.close();
}
public void testUtf8BomWithInputOffset() throws Exception
{
JsonLocation loc;
JsonParser p;
byte[] b = withUtf8Bom(" { }".getBytes());
// and then peel them off
p = JSON_F.createParser(b);
assertToken(JsonToken.START_OBJECT, p.nextToken());
loc = p.getTokenLocation();
assertEquals(6L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(7, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(7L, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(8, loc.getColumnNr());
p.close();
}
private byte[] withUtf8Bom(byte[] bytes) {
byte[] arr = new byte[bytes.length + 3];
// write UTF-8 BOM
arr[0] = (byte) 0xEF;
arr[1] = (byte) 0xBB;
arr[2] = (byte) 0xBF;
System.arraycopy(bytes, 0, arr, 3, bytes.length);
return arr;
}
// [core#603]
public void testBigPayload() throws IOException {
JsonLocation loc;
JsonParser p;
String doc = "{\"key\":\"" + generateRandomAlpha(50000) + "\"}";
p = createParserUsingStream(JSON_F, doc, "UTF-8");
assertToken(JsonToken.START_OBJECT, p.nextToken());
loc = p.getTokenLocation();
assertEquals(0, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(1, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(1, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(2, loc.getColumnNr());
assertToken(JsonToken.FIELD_NAME, p.nextToken());
loc = p.getTokenLocation();
assertEquals(1, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(2, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(8, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(9, loc.getColumnNr());
assertToken(JsonToken.VALUE_STRING, p.nextToken());
loc = p.getTokenLocation();
assertEquals(7, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(8, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(8, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(9, loc.getColumnNr());
p.getTextCharacters();
loc = p.getTokenLocation();
assertEquals(7, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(8, loc.getColumnNr());
loc = p.getCurrentLocation();
assertEquals(doc.length() - 1, loc.getByteOffset());
assertEquals(-1L, loc.getCharOffset());
assertEquals(1, loc.getLineNr());
assertEquals(doc.length(), loc.getColumnNr());
p.close();
}
private String generateRandomAlpha(int length) {
StringBuilder sb = new StringBuilder(length);
Random rnd = new Random(length);
for (int i = 0; i < length; ++i) {
// let's limit it not to include surrogate pairs:
char ch = (char) ('A' + rnd.nextInt(26));
sb.append(ch);
}
return sb.toString();
}
}