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/*
* Copyright (C) 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.gson.functional;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonStreamParser;
import com.google.gson.JsonSyntaxException;
import com.google.gson.common.TestTypes.BagOfPrimitives;
import com.google.gson.reflect.TypeToken;
import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.Map;
import junit.framework.TestCase;
/**
* Functional tests for the support of {@link Reader}s and {@link Writer}s.
*
* @author Inderjeet Singh
* @author Joel Leitch
*/
public class ReadersWritersTest extends TestCase {
private Gson gson;
@Override
protected void setUp() throws Exception {
super.setUp();
gson = new Gson();
}
public void testWriterForSerialization() throws Exception {
Writer writer = new StringWriter();
BagOfPrimitives src = new BagOfPrimitives();
gson.toJson(src, writer);
assertEquals(src.getExpectedJson(), writer.toString());
}
public void testReaderForDeserialization() throws Exception {
BagOfPrimitives expected = new BagOfPrimitives();
Reader json = new StringReader(expected.getExpectedJson());
BagOfPrimitives actual = gson.fromJson(json, BagOfPrimitives.class);
assertEquals(expected, actual);
}
public void testTopLevelNullObjectSerializationWithWriter() {
StringWriter writer = new StringWriter();
gson.toJson(null, writer);
assertEquals("null", writer.toString());
}
public void testTopLevelNullObjectDeserializationWithReader() {
StringReader reader = new StringReader("null");
Integer nullIntObject = gson.fromJson(reader, Integer.class);
assertNull(nullIntObject);
}
public void testTopLevelNullObjectSerializationWithWriterAndSerializeNulls() {
Gson gson = new GsonBuilder().serializeNulls().create();
StringWriter writer = new StringWriter();
gson.toJson(null, writer);
assertEquals("null", writer.toString());
}
public void testTopLevelNullObjectDeserializationWithReaderAndSerializeNulls() {
Gson gson = new GsonBuilder().serializeNulls().create();
StringReader reader = new StringReader("null");
Integer nullIntObject = gson.fromJson(reader, Integer.class);
assertNull(nullIntObject);
}
public void testReadWriteTwoStrings() throws IOException {
Gson gson = new Gson();
CharArrayWriter writer = new CharArrayWriter();
writer.write(gson.toJson("one").toCharArray());
writer.write(gson.toJson("two").toCharArray());
CharArrayReader reader = new CharArrayReader(writer.toCharArray());
JsonStreamParser parser = new JsonStreamParser(reader);
String actualOne = gson.fromJson(parser.next(), String.class);
assertEquals("one", actualOne);
String actualTwo = gson.fromJson(parser.next(), String.class);
assertEquals("two", actualTwo);
}
public void testReadWriteTwoObjects() throws IOException {
Gson gson = new Gson();
CharArrayWriter writer = new CharArrayWriter();
BagOfPrimitives expectedOne = new BagOfPrimitives(1, 1, true, "one");
writer.write(gson.toJson(expectedOne).toCharArray());
BagOfPrimitives expectedTwo = new BagOfPrimitives(2, 2, false, "two");
writer.write(gson.toJson(expectedTwo).toCharArray());
CharArrayReader reader = new CharArrayReader(writer.toCharArray());
JsonStreamParser parser = new JsonStreamParser(reader);
BagOfPrimitives actualOne = gson.fromJson(parser.next(), BagOfPrimitives.class);
assertEquals("one", actualOne.stringValue);
BagOfPrimitives actualTwo = gson.fromJson(parser.next(), BagOfPrimitives.class);
assertEquals("two", actualTwo.stringValue);
assertFalse(parser.hasNext());
}
public void testTypeMismatchThrowsJsonSyntaxExceptionForStrings() {
try {
gson.fromJson("true", new TypeToken<Map<String, String>>() {}.getType());
fail();
} catch (JsonSyntaxException expected) {
}
}
public void testTypeMismatchThrowsJsonSyntaxExceptionForReaders() {
try {
gson.fromJson(new StringReader("true"), new TypeToken<Map<String, String>>() {}.getType());
fail();
} catch (JsonSyntaxException expected) {
}
}
/**
* Verifies that passing an {@link Appendable} which is not an instance of {@link Writer}
* to {@code Gson.toJson} works correctly.
*/
public void testToJsonAppendable() {
class CustomAppendable implements Appendable {
final StringBuilder stringBuilder = new StringBuilder();
int toStringCallCount = 0;
@Override
public Appendable append(char c) throws IOException {
stringBuilder.append(c);
return this;
}
@Override
public Appendable append(CharSequence csq) throws IOException {
if (csq == null) {
csq = "null"; // Requirement by Writer.append
}
append(csq, 0, csq.length());
return this;
}
@Override
public Appendable append(CharSequence csq, int start, int end) throws IOException {
if (csq == null) {
csq = "null"; // Requirement by Writer.append
}
// According to doc, toString() must return string representation
String s = csq.toString();
toStringCallCount++;
stringBuilder.append(s, start, end);
return this;
}
}
CustomAppendable appendable = new CustomAppendable();
gson.toJson(Arrays.asList("test", 123, true), appendable);
// Make sure CharSequence.toString() was called at least two times to verify that
// CurrentWrite.cachedString is properly overwritten when char array changes
assertTrue(appendable.toStringCallCount >= 2);
assertEquals("[\"test\",123,true]", appendable.stringBuilder.toString());
}
}
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