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/*
* Copyright (C) 2017 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.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.common.MoreAsserts;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.MalformedJsonException;
import java.io.IOException;
import java.io.Reader;
import java.util.Arrays;
import java.util.List;
import junit.framework.TestCase;
@SuppressWarnings("resource")
public class JsonTreeReaderTest extends TestCase {
public void testSkipValue_emptyJsonObject() throws IOException {
JsonTreeReader in = new JsonTreeReader(new JsonObject());
in.skipValue();
assertEquals(JsonToken.END_DOCUMENT, in.peek());
assertEquals("$", in.getPath());
}
public void testSkipValue_filledJsonObject() throws IOException {
JsonObject jsonObject = new JsonObject();
JsonArray jsonArray = new JsonArray();
jsonArray.add('c');
jsonArray.add("text");
jsonObject.add("a", jsonArray);
jsonObject.addProperty("b", true);
jsonObject.addProperty("i", 1);
jsonObject.add("n", JsonNull.INSTANCE);
JsonObject jsonObject2 = new JsonObject();
jsonObject2.addProperty("n", 2L);
jsonObject.add("o", jsonObject2);
jsonObject.addProperty("s", "text");
JsonTreeReader in = new JsonTreeReader(jsonObject);
in.skipValue();
assertEquals(JsonToken.END_DOCUMENT, in.peek());
assertEquals("$", in.getPath());
}
public void testSkipValue_name() throws IOException {
JsonObject jsonObject = new JsonObject();
jsonObject.addProperty("a", "value");
JsonTreeReader in = new JsonTreeReader(jsonObject);
in.beginObject();
in.skipValue();
assertEquals(JsonToken.STRING, in.peek());
assertEquals("$.<skipped>", in.getPath());
assertEquals("value", in.nextString());
}
public void testSkipValue_afterEndOfDocument() throws IOException {
JsonTreeReader reader = new JsonTreeReader(new JsonObject());
reader.beginObject();
reader.endObject();
assertEquals(JsonToken.END_DOCUMENT, reader.peek());
assertEquals("$", reader.getPath());
reader.skipValue();
assertEquals(JsonToken.END_DOCUMENT, reader.peek());
assertEquals("$", reader.getPath());
}
public void testSkipValue_atArrayEnd() throws IOException {
JsonTreeReader reader = new JsonTreeReader(new JsonArray());
reader.beginArray();
reader.skipValue();
assertEquals(JsonToken.END_DOCUMENT, reader.peek());
assertEquals("$", reader.getPath());
}
public void testSkipValue_atObjectEnd() throws IOException {
JsonTreeReader reader = new JsonTreeReader(new JsonObject());
reader.beginObject();
reader.skipValue();
assertEquals(JsonToken.END_DOCUMENT, reader.peek());
assertEquals("$", reader.getPath());
}
public void testHasNext_endOfDocument() throws IOException {
JsonTreeReader reader = new JsonTreeReader(new JsonObject());
reader.beginObject();
reader.endObject();
assertFalse(reader.hasNext());
}
public void testCustomJsonElementSubclass() throws IOException {
@SuppressWarnings("deprecation") // superclass constructor
class CustomSubclass extends JsonElement {
@Override
public JsonElement deepCopy() {
return this;
}
}
JsonArray array = new JsonArray();
array.add(new CustomSubclass());
JsonTreeReader reader = new JsonTreeReader(array);
reader.beginArray();
try {
// Should fail due to custom JsonElement subclass
reader.peek();
fail();
} catch (MalformedJsonException expected) {
assertEquals("Custom JsonElement subclass " + CustomSubclass.class.getName() + " is not supported",
expected.getMessage());
}
}
/**
* {@link JsonTreeReader} effectively replaces the complete reading logic of {@link JsonReader} to
* read from a {@link JsonElement} instead of a {@link Reader}. Therefore all relevant methods of
* {@code JsonReader} must be overridden.
*/
public void testOverrides() {
List<String> ignoredMethods = Arrays.asList("setLenient(boolean)", "isLenient()");
MoreAsserts.assertOverridesMethods(JsonReader.class, JsonTreeReader.class, ignoredMethods);
}
}
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