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Java example source code file (JsonElementReaderTest.java)

This example Java source code file (JsonElementReaderTest.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

illegalstateexception, infinity, ioexception, jsonelement, jsonelementreadertest, jsontreereader, nan, numberformatexception, suppresswarnings, testcase

The JsonElementReaderTest.java Java example source code

/*
 * Copyright (C) 2011 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.internal.bind;

import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.stream.JsonToken;
import java.io.IOException;
import junit.framework.TestCase;

@SuppressWarnings("resource")
public final class JsonElementReaderTest extends TestCase {

  public void testNumbers() throws IOException {
    JsonElement element = new JsonParser().parse("[1, 2, 3]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    assertEquals(1, reader.nextInt());
    assertEquals(2L, reader.nextLong());
    assertEquals(3.0, reader.nextDouble());
    reader.endArray();
  }

  public void testLenientNansAndInfinities() throws IOException {
    JsonElement element = new JsonParser().parse("[NaN, -Infinity, Infinity]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.setLenient(true);
    reader.beginArray();
    assertTrue(Double.isNaN(reader.nextDouble()));
    assertEquals(Double.NEGATIVE_INFINITY, reader.nextDouble());
    assertEquals(Double.POSITIVE_INFINITY, reader.nextDouble());
    reader.endArray();
  }

  public void testStrictNansAndInfinities() throws IOException {
    JsonElement element = new JsonParser().parse("[NaN, -Infinity, Infinity]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.setLenient(false);
    reader.beginArray();
    try {
      reader.nextDouble();
      fail();
    } catch (NumberFormatException e) {
    }
    assertEquals("NaN", reader.nextString());
    try {
      reader.nextDouble();
      fail();
    } catch (NumberFormatException e) {
    }
    assertEquals("-Infinity", reader.nextString());
    try {
      reader.nextDouble();
      fail();
    } catch (NumberFormatException e) {
    }
    assertEquals("Infinity", reader.nextString());
    reader.endArray();
  }

  public void testNumbersFromStrings() throws IOException {
    JsonElement element = new JsonParser().parse("[\"1\", \"2\", \"3\"]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    assertEquals(1, reader.nextInt());
    assertEquals(2L, reader.nextLong());
    assertEquals(3.0, reader.nextDouble());
    reader.endArray();
  }

  public void testStringsFromNumbers() throws IOException {
    JsonElement element = new JsonParser().parse("[1]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    assertEquals("1", reader.nextString());
    reader.endArray();
  }

  public void testBooleans() throws IOException {
    JsonElement element = new JsonParser().parse("[true, false]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    assertEquals(true, reader.nextBoolean());
    assertEquals(false, reader.nextBoolean());
    reader.endArray();
  }

  public void testNulls() throws IOException {
    JsonElement element = new JsonParser().parse("[null,null]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    reader.nextNull();
    reader.nextNull();
    reader.endArray();
  }

  public void testStrings() throws IOException {
    JsonElement element = new JsonParser().parse("[\"A\",\"B\"]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    assertEquals("A", reader.nextString());
    assertEquals("B", reader.nextString());
    reader.endArray();
  }

  public void testArray() throws IOException {
    JsonElement element = new JsonParser().parse("[1, 2, 3]");
    JsonTreeReader reader = new JsonTreeReader(element);
    assertEquals(JsonToken.BEGIN_ARRAY, reader.peek());
    reader.beginArray();
    assertEquals(JsonToken.NUMBER, reader.peek());
    assertEquals(1, reader.nextInt());
    assertEquals(JsonToken.NUMBER, reader.peek());
    assertEquals(2, reader.nextInt());
    assertEquals(JsonToken.NUMBER, reader.peek());
    assertEquals(3, reader.nextInt());
    assertEquals(JsonToken.END_ARRAY, reader.peek());
    reader.endArray();
    assertEquals(JsonToken.END_DOCUMENT, reader.peek());
  }

  public void testObject() throws IOException {
    JsonElement element = new JsonParser().parse("{\"A\": 1, \"B\": 2}");
    JsonTreeReader reader = new JsonTreeReader(element);
    assertEquals(JsonToken.BEGIN_OBJECT, reader.peek());
    reader.beginObject();
    assertEquals(JsonToken.NAME, reader.peek());
    assertEquals("A", reader.nextName());
    assertEquals(JsonToken.NUMBER, reader.peek());
    assertEquals(1, reader.nextInt());
    assertEquals(JsonToken.NAME, reader.peek());
    assertEquals("B", reader.nextName());
    assertEquals(JsonToken.NUMBER, reader.peek());
    assertEquals(2, reader.nextInt());
    assertEquals(JsonToken.END_OBJECT, reader.peek());
    reader.endObject();
    assertEquals(JsonToken.END_DOCUMENT, reader.peek());
  }

  public void testEmptyArray() throws IOException {
    JsonElement element = new JsonParser().parse("[]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    reader.endArray();
  }

  public void testNestedArrays() throws IOException {
    JsonElement element = new JsonParser().parse("[[],[[]]]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    reader.beginArray();
    reader.endArray();
    reader.beginArray();
    reader.beginArray();
    reader.endArray();
    reader.endArray();
    reader.endArray();
  }

  public void testNestedObjects() throws IOException {
    JsonElement element = new JsonParser().parse("{\"A\":{},\"B\":{\"C\":{}}}");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginObject();
    assertEquals("A", reader.nextName());
    reader.beginObject();
    reader.endObject();
    assertEquals("B", reader.nextName());
    reader.beginObject();
    assertEquals("C", reader.nextName());
    reader.beginObject();
    reader.endObject();
    reader.endObject();
    reader.endObject();
  }

  public void testEmptyObject() throws IOException {
    JsonElement element = new JsonParser().parse("{}");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginObject();
    reader.endObject();
  }

  public void testSkipValue() throws IOException {
    JsonElement element = new JsonParser().parse("[\"A\",{\"B\":[[]]},\"C\",[[]],\"D\",null]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    assertEquals("A", reader.nextString());
    reader.skipValue();
    assertEquals("C", reader.nextString());
    reader.skipValue();
    assertEquals("D", reader.nextString());
    reader.skipValue();
    reader.endArray();
  }

  public void testWrongType() throws IOException {
    JsonElement element = new JsonParser().parse("[[],\"A\"]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    try {
      reader.nextBoolean();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.nextNull();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.nextString();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.nextInt();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.nextLong();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.nextDouble();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.nextName();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.beginObject();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.endArray();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.endObject();
      fail();
    } catch (IllegalStateException expected) {
    }
    reader.beginArray();
    reader.endArray();

    try {
      reader.nextBoolean();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.nextNull();
      fail();
    } catch (IllegalStateException expected) {
    }
    try {
      reader.nextInt();
      fail();
    } catch (NumberFormatException expected) {
    }
    try {
      reader.nextLong();
      fail();
    } catch (NumberFormatException expected) {
    }
    try {
      reader.nextDouble();
      fail();
    } catch (NumberFormatException expected) {
    }
    try {
      reader.nextName();
      fail();
    } catch (IllegalStateException expected) {
    }
    assertEquals("A", reader.nextString());
    reader.endArray();
  }

  public void testEarlyClose() throws IOException {
    JsonElement element = new JsonParser().parse("[1, 2, 3]");
    JsonTreeReader reader = new JsonTreeReader(element);
    reader.beginArray();
    reader.close();
    try {
      reader.peek();
      fail();
    } catch (IllegalStateException expected) {
    }
  }
}

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