416 lines
14 KiB
Java
416 lines
14 KiB
Java
/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.functional;
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import java.lang.reflect.Type;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import java.util.PriorityQueue;
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import java.util.Queue;
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import java.util.Set;
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import java.util.Stack;
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import java.util.Vector;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import com.google.gson.JsonElement;
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import com.google.gson.JsonPrimitive;
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import com.google.gson.JsonSerializationContext;
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import com.google.gson.JsonSerializer;
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import com.google.gson.common.TestTypes.BagOfPrimitives;
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import com.google.gson.reflect.TypeToken;
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import junit.framework.TestCase;
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import static org.junit.Assert.assertArrayEquals;
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/**
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* Functional tests for Json serialization and deserialization of collections.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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*/
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public class CollectionTest extends TestCase {
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private Gson gson;
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@Override
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protected void setUp() throws Exception {
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super.setUp();
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gson = new Gson();
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}
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public void testTopLevelCollectionOfIntegersSerialization() {
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Collection<Integer> target = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);
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Type targetType = new TypeToken<Collection<Integer>>() {}.getType();
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String json = gson.toJson(target, targetType);
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assertEquals("[1,2,3,4,5,6,7,8,9]", json);
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}
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public void testTopLevelCollectionOfIntegersDeserialization() {
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String json = "[0,1,2,3,4,5,6,7,8,9]";
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Type collectionType = new TypeToken<Collection<Integer>>() { }.getType();
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Collection<Integer> target = gson.fromJson(json, collectionType);
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int[] expected = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
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assertArrayEquals(expected, toIntArray(target));
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}
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public void testTopLevelListOfIntegerCollectionsDeserialization() throws Exception {
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String json = "[[1,2,3],[4,5,6],[7,8,9]]";
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Type collectionType = new TypeToken<Collection<Collection<Integer>>>() {}.getType();
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List<Collection<Integer>> target = gson.fromJson(json, collectionType);
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int[][] expected = new int[3][3];
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for (int i = 0; i < 3; ++i) {
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int start = (3 * i) + 1;
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for (int j = 0; j < 3; ++j) {
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expected[i][j] = start + j;
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}
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}
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for (int i = 0; i < 3; i++) {
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assertArrayEquals(expected[i], toIntArray(target.get(i)));
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}
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}
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public void testLinkedListSerialization() {
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List<String> list = new LinkedList<>();
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list.add("a1");
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list.add("a2");
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Type linkedListType = new TypeToken<LinkedList<String>>() {}.getType();
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String json = gson.toJson(list, linkedListType);
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assertTrue(json.contains("a1"));
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assertTrue(json.contains("a2"));
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}
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public void testLinkedListDeserialization() {
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String json = "['a1','a2']";
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Type linkedListType = new TypeToken<LinkedList<String>>() {}.getType();
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List<String> list = gson.fromJson(json, linkedListType);
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assertEquals("a1", list.get(0));
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assertEquals("a2", list.get(1));
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}
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public void testQueueSerialization() {
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Queue<String> queue = new LinkedList<>();
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queue.add("a1");
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queue.add("a2");
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Type queueType = new TypeToken<Queue<String>>() {}.getType();
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String json = gson.toJson(queue, queueType);
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assertTrue(json.contains("a1"));
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assertTrue(json.contains("a2"));
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}
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public void testQueueDeserialization() {
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String json = "['a1','a2']";
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Type queueType = new TypeToken<Queue<String>>() {}.getType();
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Queue<String> queue = gson.fromJson(json, queueType);
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assertEquals("a1", queue.element());
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queue.remove();
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assertEquals("a2", queue.element());
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}
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public void testPriorityQueue() throws Exception {
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Type type = new TypeToken<PriorityQueue<Integer>>(){}.getType();
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PriorityQueue<Integer> queue = gson.fromJson("[10, 20, 22]", type);
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assertEquals(3, queue.size());
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String json = gson.toJson(queue);
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assertEquals(10, queue.remove().intValue());
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assertEquals(20, queue.remove().intValue());
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assertEquals(22, queue.remove().intValue());
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assertEquals("[10,20,22]", json);
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}
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public void testVector() {
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Type type = new TypeToken<Vector<Integer>>(){}.getType();
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Vector<Integer> target = gson.fromJson("[10, 20, 31]", type);
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assertEquals(3, target.size());
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assertEquals(10, target.get(0).intValue());
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assertEquals(20, target.get(1).intValue());
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assertEquals(31, target.get(2).intValue());
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String json = gson.toJson(target);
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assertEquals("[10,20,31]", json);
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}
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public void testStack() {
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Type type = new TypeToken<Stack<Integer>>(){}.getType();
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Stack<Integer> target = gson.fromJson("[11, 13, 17]", type);
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assertEquals(3, target.size());
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String json = gson.toJson(target);
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assertEquals(17, target.pop().intValue());
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assertEquals(13, target.pop().intValue());
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assertEquals(11, target.pop().intValue());
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assertEquals("[11,13,17]", json);
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}
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public void testNullsInListSerialization() {
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List<String> list = new ArrayList<>();
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list.add("foo");
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list.add(null);
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list.add("bar");
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String expected = "[\"foo\",null,\"bar\"]";
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Type typeOfList = new TypeToken<List<String>>() {}.getType();
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String json = gson.toJson(list, typeOfList);
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assertEquals(expected, json);
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}
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public void testNullsInListDeserialization() {
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List<String> expected = new ArrayList<>();
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expected.add("foo");
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expected.add(null);
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expected.add("bar");
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String json = "[\"foo\",null,\"bar\"]";
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Type expectedType = new TypeToken<List<String>>() {}.getType();
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List<String> target = gson.fromJson(json, expectedType);
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for (int i = 0; i < expected.size(); ++i) {
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assertEquals(expected.get(i), target.get(i));
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}
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}
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public void testCollectionOfObjectSerialization() {
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List<Object> target = new ArrayList<>();
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target.add("Hello");
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target.add("World");
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assertEquals("[\"Hello\",\"World\"]", gson.toJson(target));
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Type type = new TypeToken<List<Object>>() {}.getType();
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assertEquals("[\"Hello\",\"World\"]", gson.toJson(target, type));
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}
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public void testCollectionOfObjectWithNullSerialization() {
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List<Object> target = new ArrayList<>();
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target.add("Hello");
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target.add(null);
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target.add("World");
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assertEquals("[\"Hello\",null,\"World\"]", gson.toJson(target));
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Type type = new TypeToken<List<Object>>() {}.getType();
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assertEquals("[\"Hello\",null,\"World\"]", gson.toJson(target, type));
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}
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public void testCollectionOfStringsSerialization() {
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List<String> target = new ArrayList<>();
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target.add("Hello");
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target.add("World");
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assertEquals("[\"Hello\",\"World\"]", gson.toJson(target));
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}
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public void testCollectionOfBagOfPrimitivesSerialization() {
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List<BagOfPrimitives> target = new ArrayList<>();
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BagOfPrimitives objA = new BagOfPrimitives(3L, 1, true, "blah");
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BagOfPrimitives objB = new BagOfPrimitives(2L, 6, false, "blahB");
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target.add(objA);
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target.add(objB);
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String result = gson.toJson(target);
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assertTrue(result.startsWith("["));
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assertTrue(result.endsWith("]"));
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for (BagOfPrimitives obj : target) {
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assertTrue(result.contains(obj.getExpectedJson()));
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}
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}
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public void testCollectionOfStringsDeserialization() {
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String json = "[\"Hello\",\"World\"]";
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Type collectionType = new TypeToken<Collection<String>>() { }.getType();
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Collection<String> target = gson.fromJson(json, collectionType);
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assertTrue(target.contains("Hello"));
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assertTrue(target.contains("World"));
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}
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public void testRawCollectionOfIntegersSerialization() {
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Collection<Integer> target = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);
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assertEquals("[1,2,3,4,5,6,7,8,9]", gson.toJson(target));
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}
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@SuppressWarnings("rawtypes")
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public void testRawCollectionSerialization() {
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BagOfPrimitives bag1 = new BagOfPrimitives();
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Collection target = Arrays.asList(bag1, bag1);
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String json = gson.toJson(target);
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assertTrue(json.contains(bag1.getExpectedJson()));
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}
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@SuppressWarnings("rawtypes")
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public void testRawCollectionDeserializationNotAlllowed() {
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String json = "[0,1,2,3,4,5,6,7,8,9]";
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Collection integers = gson.fromJson(json, Collection.class);
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// JsonReader converts numbers to double by default so we need a floating point comparison
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assertEquals(Arrays.asList(0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0), integers);
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json = "[\"Hello\", \"World\"]";
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Collection strings = gson.fromJson(json, Collection.class);
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assertTrue(strings.contains("Hello"));
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assertTrue(strings.contains("World"));
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}
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@SuppressWarnings({"rawtypes", "unchecked"})
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public void testRawCollectionOfBagOfPrimitivesNotAllowed() {
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BagOfPrimitives bag = new BagOfPrimitives(10, 20, false, "stringValue");
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String json = '[' + bag.getExpectedJson() + ',' + bag.getExpectedJson() + ']';
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Collection target = gson.fromJson(json, Collection.class);
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assertEquals(2, target.size());
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for (Object bag1 : target) {
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// Gson 2.0 converts raw objects into maps
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Map<String, Object> values = (Map<String, Object>) bag1;
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assertTrue(values.containsValue(10.0));
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assertTrue(values.containsValue(20.0));
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assertTrue(values.containsValue("stringValue"));
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}
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}
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public void testWildcardPrimitiveCollectionSerilaization() throws Exception {
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Collection<? extends Integer> target = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);
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Type collectionType = new TypeToken<Collection<? extends Integer>>() { }.getType();
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String json = gson.toJson(target, collectionType);
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assertEquals("[1,2,3,4,5,6,7,8,9]", json);
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json = gson.toJson(target);
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assertEquals("[1,2,3,4,5,6,7,8,9]", json);
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}
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public void testWildcardPrimitiveCollectionDeserilaization() throws Exception {
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String json = "[1,2,3,4,5,6,7,8,9]";
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Type collectionType = new TypeToken<Collection<? extends Integer>>() { }.getType();
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Collection<? extends Integer> target = gson.fromJson(json, collectionType);
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assertEquals(9, target.size());
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assertTrue(target.contains(1));
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assertTrue(target.contains(9));
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}
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public void testWildcardCollectionField() throws Exception {
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Collection<BagOfPrimitives> collection = new ArrayList<>();
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BagOfPrimitives objA = new BagOfPrimitives(3L, 1, true, "blah");
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BagOfPrimitives objB = new BagOfPrimitives(2L, 6, false, "blahB");
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collection.add(objA);
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collection.add(objB);
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ObjectWithWildcardCollection target = new ObjectWithWildcardCollection(collection);
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String json = gson.toJson(target);
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assertTrue(json.contains(objA.getExpectedJson()));
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assertTrue(json.contains(objB.getExpectedJson()));
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target = gson.fromJson(json, ObjectWithWildcardCollection.class);
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Collection<? extends BagOfPrimitives> deserializedCollection = target.getCollection();
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assertEquals(2, deserializedCollection.size());
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assertTrue(deserializedCollection.contains(objA));
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assertTrue(deserializedCollection.contains(objB));
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}
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public void testFieldIsArrayList() {
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HasArrayListField object = new HasArrayListField();
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object.longs.add(1L);
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object.longs.add(3L);
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String json = gson.toJson(object, HasArrayListField.class);
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assertEquals("{\"longs\":[1,3]}", json);
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HasArrayListField copy = gson.fromJson("{\"longs\":[1,3]}", HasArrayListField.class);
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assertEquals(Arrays.asList(1L, 3L), copy.longs);
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}
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public void testUserCollectionTypeAdapter() {
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Type listOfString = new TypeToken<List<String>>() {}.getType();
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Object stringListSerializer = new JsonSerializer<List<String>>() {
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@Override public JsonElement serialize(List<String> src, Type typeOfSrc,
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JsonSerializationContext context) {
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return new JsonPrimitive(src.get(0) + ";" + src.get(1));
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}
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};
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Gson gson = new GsonBuilder()
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.registerTypeAdapter(listOfString, stringListSerializer)
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.create();
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assertEquals("\"ab;cd\"", gson.toJson(Arrays.asList("ab", "cd"), listOfString));
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}
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static class HasArrayListField {
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ArrayList<Long> longs = new ArrayList<>();
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}
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@SuppressWarnings("rawtypes")
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private static int[] toIntArray(Collection collection) {
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int[] ints = new int[collection.size()];
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int i = 0;
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for (Iterator iterator = collection.iterator(); iterator.hasNext(); ++i) {
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Object obj = iterator.next();
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if (obj instanceof Integer) {
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ints[i] = ((Integer)obj).intValue();
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} else if (obj instanceof Long) {
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ints[i] = ((Long)obj).intValue();
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}
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}
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return ints;
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}
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private static class ObjectWithWildcardCollection {
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private final Collection<? extends BagOfPrimitives> collection;
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public ObjectWithWildcardCollection(Collection<? extends BagOfPrimitives> collection) {
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this.collection = collection;
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}
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public Collection<? extends BagOfPrimitives> getCollection() {
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return collection;
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}
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}
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private static class Entry {
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int value;
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Entry(int value) {
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this.value = value;
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}
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}
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public void testSetSerialization() {
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Set<Entry> set = new HashSet<>();
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set.add(new Entry(1));
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set.add(new Entry(2));
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String json = gson.toJson(set);
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assertTrue(json.contains("1"));
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assertTrue(json.contains("2"));
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}
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public void testSetDeserialization() {
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String json = "[{value:1},{value:2}]";
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Type type = new TypeToken<Set<Entry>>() {}.getType();
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Set<Entry> set = gson.fromJson(json, type);
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assertEquals(2, set.size());
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for (Entry entry : set) {
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assertTrue(entry.value == 1 || entry.value == 2);
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}
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}
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private class BigClass { private Map<String, ? extends List<SmallClass>> inBig; }
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private class SmallClass { private String inSmall; }
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public void testIssue1107() {
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String json = "{\n" +
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" \"inBig\": {\n" +
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" \"key\": [\n" +
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" { \"inSmall\": \"hello\" }\n" +
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" ]\n" +
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" }\n" +
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"}";
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BigClass bigClass = new Gson().fromJson(json, BigClass.class);
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SmallClass small = bigClass.inBig.get("key").get(0);
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assertNotNull(small);
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assertEquals("hello", small.inSmall);
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}
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}
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