gson-comments/gson/src/test/java/com/google/gson/functional/PrettyPrintingTest.java

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/*
* Copyright (C) 2008 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.
*/
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package com.google.gson.functional;
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import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
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import com.google.gson.common.TestTypes.ArrayOfObjects;
import com.google.gson.common.TestTypes.BagOfPrimitives;
import com.google.gson.reflect.TypeToken;
import junit.framework.TestCase;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
/**
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* Functional tests for pretty printing option.
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*
* @author Inderjeet Singh
* @author Joel Leitch
*/
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public class PrettyPrintingTest extends TestCase {
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private static int PRINT_MARGIN = 80;
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private static int RIGHT_MARGIN = 4;
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private static boolean DEBUG = false;
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private Gson gson;
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@Override
protected void setUp() throws Exception {
super.setUp();
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gson = new GsonBuilder().setPrettyPrinting().create();
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}
public void testPrettyPrintList() {
BagOfPrimitives b = new BagOfPrimitives();
List<BagOfPrimitives> listOfB = new LinkedList<BagOfPrimitives>();
for (int i = 0; i < 15; ++i) {
listOfB.add(b);
}
Type typeOfSrc = new TypeToken<List<BagOfPrimitives>>() {}.getType();
String json = gson.toJson(listOfB, typeOfSrc);
print(json);
assertPrintMargin(json);
}
public void testPrettyPrintArrayOfObjects() {
ArrayOfObjects target = new ArrayOfObjects();
String json = gson.toJson(target);
print(json);
assertPrintMargin(json);
}
public void testPrettyPrintArrayOfPrimitives() {
int[] ints = new int[] { 1, 2, 3, 4, 5 };
String json = gson.toJson(ints);
assertEquals("[1,2,3,4,5]\n", json);
}
public void testPrettyPrintArrayOfPrimitiveArrays() {
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int[][] ints = new int[][] { { 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 },
{ 9, 0 }, { 10 } };
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String json = gson.toJson(ints);
assertEquals("[[1,2],[3,4],[5,6],[7,8],[9,0],[10]]\n", json);
}
public void testPrettyPrintListOfPrimitiveArrays() {
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List<Integer[]> list = Arrays.asList(new Integer[][] { { 1, 2 }, { 3, 4 },
{ 5, 6 }, { 7, 8 }, { 9, 0 }, { 10 } });
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String json = gson.toJson(list);
assertEquals("[[1,2],[3,4],[5,6],[7,8],[9,0],[10]]\n", json);
}
public void testMultipleArrays() {
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int[][][] ints = new int[][][] { { { 1 }, { 2 } } };
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String json = gson.toJson(ints);
assertEquals("[[[1],[2]]]\n", json);
}
private void print(String msg) {
if (DEBUG) {
System.out.println(msg);
}
}
private void assertPrintMargin(String str) {
int position = 0;
char[] chars = str.toCharArray();
for (int i = 0; i < chars.length; ++i, ++position) {
char c = chars[i];
if (c == '\n') {
position = 0;
}
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assertTrue(position <= PRINT_MARGIN - RIGHT_MARGIN + 1);
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}
}
}