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Java example source code file (JsonReaderPathTest.java)

This example Java source code file (JsonReaderPathTest.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

factory, ioexception, jsonelement, jsonreader, jsonreaderpathtest, jsontreereader, list, object, object_reader, override, string_reader, stringreader, test, util

The JsonReaderPathTest.java Java example source code

/*
 * Copyright (C) 2014 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.stream;

import com.google.gson.JsonElement;
import com.google.gson.internal.Streams;
import com.google.gson.internal.bind.JsonTreeReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.Arrays;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import static junit.framework.Assert.assertEquals;
import static org.junit.Assume.assumeTrue;

@RunWith(Parameterized.class)
public class JsonReaderPathTest {
  @Parameterized.Parameters(name = "{0}")
  public static List<Object[]> parameters() {
    return Arrays.asList(
        new Object[] { Factory.STRING_READER },
        new Object[] { Factory.OBJECT_READER }
    );
  }

  @Parameterized.Parameter
  public Factory factory;

  @Test public void path() throws IOException {
    JsonReader reader = factory.create("{\"a\":[2,true,false,null,\"b\",{\"c\":\"d\"},[3]]}");
    assertEquals("$", reader.getPath());
    reader.beginObject();
    assertEquals("$.", reader.getPath());
    reader.nextName();
    assertEquals("$.a", reader.getPath());
    reader.beginArray();
    assertEquals("$.a[0]", reader.getPath());
    reader.nextInt();
    assertEquals("$.a[1]", reader.getPath());
    reader.nextBoolean();
    assertEquals("$.a[2]", reader.getPath());
    reader.nextBoolean();
    assertEquals("$.a[3]", reader.getPath());
    reader.nextNull();
    assertEquals("$.a[4]", reader.getPath());
    reader.nextString();
    assertEquals("$.a[5]", reader.getPath());
    reader.beginObject();
    assertEquals("$.a[5].", reader.getPath());
    reader.nextName();
    assertEquals("$.a[5].c", reader.getPath());
    reader.nextString();
    assertEquals("$.a[5].c", reader.getPath());
    reader.endObject();
    assertEquals("$.a[6]", reader.getPath());
    reader.beginArray();
    assertEquals("$.a[6][0]", reader.getPath());
    reader.nextInt();
    assertEquals("$.a[6][1]", reader.getPath());
    reader.endArray();
    assertEquals("$.a[7]", reader.getPath());
    reader.endArray();
    assertEquals("$.a", reader.getPath());
    reader.endObject();
    assertEquals("$", reader.getPath());
  }

  @Test public void objectPath() throws IOException {
    JsonReader reader = factory.create("{\"a\":1,\"b\":2}");
    assertEquals("$", reader.getPath());

    reader.peek();
    assertEquals("$", reader.getPath());
    reader.beginObject();
    assertEquals("$.", reader.getPath());

    reader.peek();
    assertEquals("$.", reader.getPath());
    reader.nextName();
    assertEquals("$.a", reader.getPath());

    reader.peek();
    assertEquals("$.a", reader.getPath());
    reader.nextInt();
    assertEquals("$.a", reader.getPath());

    reader.peek();
    assertEquals("$.a", reader.getPath());
    reader.nextName();
    assertEquals("$.b", reader.getPath());

    reader.peek();
    assertEquals("$.b", reader.getPath());
    reader.nextInt();
    assertEquals("$.b", reader.getPath());

    reader.peek();
    assertEquals("$.b", reader.getPath());
    reader.endObject();
    assertEquals("$", reader.getPath());

    reader.peek();
    assertEquals("$", reader.getPath());
    reader.close();
    assertEquals("$", reader.getPath());
  }

  @Test public void arrayPath() throws IOException {
    JsonReader reader = factory.create("[1,2]");
    assertEquals("$", reader.getPath());

    reader.peek();
    assertEquals("$", reader.getPath());
    reader.beginArray();
    assertEquals("$[0]", reader.getPath());

    reader.peek();
    assertEquals("$[0]", reader.getPath());
    reader.nextInt();
    assertEquals("$[1]", reader.getPath());

    reader.peek();
    assertEquals("$[1]", reader.getPath());
    reader.nextInt();
    assertEquals("$[2]", reader.getPath());

    reader.peek();
    assertEquals("$[2]", reader.getPath());
    reader.endArray();
    assertEquals("$", reader.getPath());

    reader.peek();
    assertEquals("$", reader.getPath());
    reader.close();
    assertEquals("$", reader.getPath());
  }

  @Test public void multipleTopLevelValuesInOneDocument() throws IOException {
    assumeTrue(factory == Factory.STRING_READER);

    JsonReader reader = factory.create("[][]");
    reader.setLenient(true);
    reader.beginArray();
    reader.endArray();
    assertEquals("$", reader.getPath());
    reader.beginArray();
    reader.endArray();
    assertEquals("$", reader.getPath());
  }

  @Test public void skipArrayElements() throws IOException {
    JsonReader reader = factory.create("[1,2,3]");
    reader.beginArray();
    reader.skipValue();
    reader.skipValue();
    assertEquals("$[2]", reader.getPath());
  }

  @Test public void skipObjectNames() throws IOException {
    JsonReader reader = factory.create("{\"a\":1}");
    reader.beginObject();
    reader.skipValue();
    assertEquals("$.null", reader.getPath());
  }

  @Test public void skipObjectValues() throws IOException {
    JsonReader reader = factory.create("{\"a\":1,\"b\":2}");
    reader.beginObject();
    assertEquals("$.", reader.getPath());
    reader.nextName();
    reader.skipValue();
    assertEquals("$.null", reader.getPath());
    reader.nextName();
    assertEquals("$.b", reader.getPath());
  }

  @Test public void skipNestedStructures() throws IOException {
    JsonReader reader = factory.create("[[1,2,3],4]");
    reader.beginArray();
    reader.skipValue();
    assertEquals("$[1]", reader.getPath());
  }

  @Test public void arrayOfObjects() throws IOException {
    JsonReader reader = factory.create("[{},{},{}]");
    reader.beginArray();
    assertEquals("$[0]", reader.getPath());
    reader.beginObject();
    assertEquals("$[0].", reader.getPath());
    reader.endObject();
    assertEquals("$[1]", reader.getPath());
    reader.beginObject();
    assertEquals("$[1].", reader.getPath());
    reader.endObject();
    assertEquals("$[2]", reader.getPath());
    reader.beginObject();
    assertEquals("$[2].", reader.getPath());
    reader.endObject();
    assertEquals("$[3]", reader.getPath());
    reader.endArray();
    assertEquals("$", reader.getPath());
  }

  @Test public void arrayOfArrays() throws IOException {
    JsonReader reader = factory.create("[[],[],[]]");
    reader.beginArray();
    assertEquals("$[0]", reader.getPath());
    reader.beginArray();
    assertEquals("$[0][0]", reader.getPath());
    reader.endArray();
    assertEquals("$[1]", reader.getPath());
    reader.beginArray();
    assertEquals("$[1][0]", reader.getPath());
    reader.endArray();
    assertEquals("$[2]", reader.getPath());
    reader.beginArray();
    assertEquals("$[2][0]", reader.getPath());
    reader.endArray();
    assertEquals("$[3]", reader.getPath());
    reader.endArray();
    assertEquals("$", reader.getPath());
  }

  enum Factory {
    STRING_READER {
      @Override public JsonReader create(String data) {
        return new JsonReader(new StringReader(data));
      }
    },
    OBJECT_READER {
      @Override public JsonReader create(String data) {
        JsonElement element = Streams.parse(new JsonReader(new StringReader(data)));
        return new JsonTreeReader(element);
      }
    };

    abstract JsonReader create(String data);
  }
}

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