alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (JsonParserTest.java)

This example Java source code file (JsonParserTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bagofprimitives, chararrayreader, chararraywriter, gson, jsonelement, jsonparser, jsonparsertest, jsonreader, jsonsyntaxexception, override, string, stringreader, test, testcase

The JsonParserTest.java Java example source code

/*
 * Copyright (C) 2009 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;

import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.StringReader;

import junit.framework.TestCase;

import com.google.gson.common.TestTypes.BagOfPrimitives;
import com.google.gson.internal.Streams;
import com.google.gson.stream.JsonReader;

/**
 * Unit test for {@link JsonParser}
 *
 * @author Inderjeet Singh
 */
public class JsonParserTest extends TestCase {
  private JsonParser parser;

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    parser = new JsonParser();
  }

  public void testParseInvalidJson() {
    try {
      parser.parse("[[]");
      fail();
    } catch (JsonSyntaxException expected) { }
  }

  public void testParseUnquotedStringArrayFails() {
    JsonElement element = parser.parse("[a,b,c]");
    assertEquals("a", element.getAsJsonArray().get(0).getAsString());
    assertEquals("b", element.getAsJsonArray().get(1).getAsString());
    assertEquals("c", element.getAsJsonArray().get(2).getAsString());
    assertEquals(3, element.getAsJsonArray().size());
  }

  public void testParseString() {
    String json = "{a:10,b:'c'}";
    JsonElement e = parser.parse(json);
    assertTrue(e.isJsonObject());
    assertEquals(10, e.getAsJsonObject().get("a").getAsInt());
    assertEquals("c", e.getAsJsonObject().get("b").getAsString());
  }

  public void testParseEmptyString() {
    JsonElement e = parser.parse("\"   \"");
    assertTrue(e.isJsonPrimitive());
    assertEquals("   ", e.getAsString());
  }

  public void testParseEmptyWhitespaceInput() {
    JsonElement e = parser.parse("     ");
    assertTrue(e.isJsonNull());
  }

  public void testParseUnquotedSingleWordStringFails() {
    assertEquals("Test", parser.parse("Test").getAsString());
  }

  public void testParseUnquotedMultiWordStringFails() {
    String unquotedSentence = "Test is a test..blah blah";
    try {
      parser.parse(unquotedSentence);
      fail();
    } catch (JsonSyntaxException expected) { }
  }

  public void testParseMixedArray() {
    String json = "[{},13,\"stringValue\"]";
    JsonElement e = parser.parse(json);
    assertTrue(e.isJsonArray());

    JsonArray  array = e.getAsJsonArray();
    assertEquals("{}", array.get(0).toString());
    assertEquals(13, array.get(1).getAsInt());
    assertEquals("stringValue", array.get(2).getAsString());
  }

  public void testParseReader() {
    StringReader reader = new StringReader("{a:10,b:'c'}");
    JsonElement e = parser.parse(reader);
    assertTrue(e.isJsonObject());
    assertEquals(10, e.getAsJsonObject().get("a").getAsInt());
    assertEquals("c", e.getAsJsonObject().get("b").getAsString());
  }

  public void testReadWriteTwoObjects() throws Exception {
    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());

    JsonReader parser = new JsonReader(reader);
    parser.setLenient(true);
    JsonElement element1 = Streams.parse(parser);
    JsonElement element2 = Streams.parse(parser);
    BagOfPrimitives actualOne = gson.fromJson(element1, BagOfPrimitives.class);
    assertEquals("one", actualOne.stringValue);
    BagOfPrimitives actualTwo = gson.fromJson(element2, BagOfPrimitives.class);
    assertEquals("two", actualTwo.stringValue);
  }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java JsonParserTest.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.