| /* |
| * 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()); |
| } |
| } |