johnzon-core/src/test/java/org/apache/johnzon/core/OverflowTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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
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 */
package org.apache.johnzon.core;

import org.junit.Assert;
import org.junit.Test;

import jakarta.json.Json;
import jakarta.json.JsonArray;
import jakarta.json.JsonArrayBuilder;
import jakarta.json.JsonObject;
import jakarta.json.JsonWriter;
import jakarta.json.JsonWriterFactory;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.HashMap;

import static org.junit.Assert.assertEquals;

public class OverflowTest {
    @Test
    public void ok() {
        // normal content size
        Json.createReaderFactory(new HashMap<String, Object>() {{
            put(JsonParserFactoryImpl.MAX_STRING_LENGTH, "10");
            put(JsonParserFactoryImpl.BUFFER_LENGTH, "2");
        }}).createReader(new StringReader("{\"a\":\"b\",\n\"another\":\"value\"}")).readObject();

        // oversized
        final JsonObject object = Json.createReaderFactory(new HashMap<String, Object>() {{
            put(JsonParserFactoryImpl.MAX_STRING_LENGTH, "10");
            put(JsonParserFactoryImpl.BUFFER_LENGTH, "2");
        }}).createReader(new StringReader("{\"a\":\"b\",\n\"another\":\"value very long\"}")).readObject();
        assertEquals("value very long", object.getString("another"));
    }

    @Test(expected = ArrayIndexOutOfBoundsException.class)
    public void ko() {
        Json.createReaderFactory(new HashMap<String, Object>() {{
            put(JsonParserFactoryImpl.MAX_STRING_LENGTH, "10");
            put(JsonParserFactoryImpl.BUFFER_LENGTH, "2");
            put(JsonParserFactoryImpl.AUTO_ADJUST_STRING_BUFFER, "false");
        }}).createReader(new StringReader("{\"another\":\"value too long\"}")).readObject();
    }

    @Test
    public void testVeryLargeJson() {
        JsonWriterFactory writerFactory = Json.createWriterFactory(new HashMap<String, Object>() {{
            put(JsonParserFactoryImpl.BUFFER_LENGTH, "256");
        }});

        int itemSize = 50_000;

        StringWriter sw = new StringWriter();
        JsonWriter writer = writerFactory.createWriter(sw);

        JsonArrayBuilder arrayBuilder = Json.createArrayBuilder();
        for (int i = 0; i < itemSize; i++) {
            arrayBuilder.add("0123456789012345-" + i);
        }
        writer.writeArray(arrayBuilder.build());
        writer.close();

        String json = sw.toString();
        System.out.println("Created a JSON of size " + json.length() + " bytes");

        // read it back in
        JsonArray jsonArray = Json.createReader(new StringReader(json)).readArray();
        Assert.assertEquals(itemSize, jsonArray.size());

    }
}