johnzon-core/src/test/java/org/apache/johnzon/core/JsonGeneratorImplTest.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 static org.junit.Assert.assertEquals;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.StringWriter;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.HashMap;

import javax.json.Json;
import javax.json.JsonReader;
import javax.json.JsonValue;
import javax.json.JsonWriter;
import javax.json.JsonWriterFactory;
import javax.json.stream.JsonGenerationException;
import javax.json.stream.JsonGenerator;

import org.junit.Test;

public class JsonGeneratorImplTest {
    @Test
    public void notFluentGeneratorUsage() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final JsonGenerator generator = Json.createGenerator(baos);
        generator.writeStartArray();
        generator.writeStartObject();
        generator.writeEnd();
        generator.writeEnd();
        generator.close();
        assertEquals("[{}]", new String(baos.toByteArray()));
    }

    @Test
    public void emptyArray() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final JsonGenerator generator = Json.createGenerator(baos);
        generator.writeStartArray().writeEnd().close();
        assertEquals("[]", new String(baos.toByteArray()));
    }

    @Test
    public void simpleArray() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().write(1).write(2).writeEnd().close();
        assertEquals("[1,2]", new String(baos.toByteArray()));
    }
    
    @Test
    public void escapeZero() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().write("\0").write(String.valueOf((char) 29)).writeEnd().close();
        assertEquals("[\"\\u0000\",\"\\u001d\"]", new String(baos.toByteArray()));
    }

    @Test
    public void stringArray() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().write("val1").write("val2").writeEnd().close();
        assertEquals("[\"val1\",\"val2\"]", new String(baos.toByteArray()));
    }

    @Test
    public void stringArrayEscapes() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().write("\"val1\t\u0010").write("val2\\").writeEnd().close();
        assertEquals("[\"\\\"val1\\t\\u0010\",\"val2\\\\\"]", new String(baos.toByteArray()));
    }

    @Test
    public void stringArrayEscapes2() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().write("\"val1\t\u0067").write("val2\\").writeEnd().close();
        assertEquals("[\"\\\"val1\\tg\",\"val2\\\\\"]", new String(baos.toByteArray()));
    }

    @Test
    public void emptyStringArray() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeNull().write("").writeEnd().close();
        assertEquals("[null,\"\"]", new String(baos.toByteArray()));
    }

    @Test
    public void wsStringArray() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().write(new JsonStringImpl(" ")).write(new JsonStringImpl("")).write("").write(" ")
        .writeEnd().close();
        assertEquals("[\" \",\"\",\"\",\" \"]", new String(baos.toByteArray()));
    }

    @Test
    public void nullLiteralArray() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeNull().write(JsonValue.NULL).writeEnd().close();
        assertEquals("[null,null]", new String(baos.toByteArray()));
    }

    @Test
    public void boolLiteralArray() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().write(JsonValue.FALSE).write(JsonValue.TRUE).writeEnd().close();
        assertEquals("[false,true]", new String(baos.toByteArray()));
    }

    @Test(expected = JsonGenerationException.class)
    public void fail1() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray("test");
    }

    @Test(expected = JsonGenerationException.class)
    public void fail2() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).write("test", 1);
    }

    @Test(expected = JsonGenerationException.class)
    public void fail3() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartObject().writeStartObject();
    }

    @Test(expected = JsonGenerationException.class)
    public void fail4() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeEnd();
    }

    @Test(expected = JsonGenerationException.class)
    public void fail5() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).close();
    }

    @Test(expected = JsonGenerationException.class)
    public void fail6() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeStartObject("test");
    }

    @Test(expected = JsonGenerationException.class)
    public void fail7() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeNull().writeStartObject().write("a", new BigDecimal("123.123")).write("b", true)
                .write("c", new BigInteger("3312")).write("d", new JsonStringImpl("mystring")).writeEnd().close();

    }

    @Test(expected = JsonGenerationException.class)
    public void fail9() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartObject().write("a", new BigDecimal("123.123")).write("b", true)
                .write("c", new BigInteger("3312")).write("d", new JsonStringImpl("mystring")).writeEnd().writeStartObject().close();

    }

    @Test
    public void numbers() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeNull().writeStartObject().write("a", new BigDecimal("123.123")).write("b", true)
                .write("c", new BigInteger("3312")).write("d", new JsonStringImpl("Mystring")).writeEnd().writeEnd().close();
        assertEquals("[null,{\"a\":123.123,\"b\":true,\"c\":3312,\"d\":\"Mystring\"}]", new String(baos.toByteArray()));
    }

    @Test
    public void integralNumbers() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeNull().writeStartObject().write("a", Long.MAX_VALUE).write("b", Long.MIN_VALUE)
                .write("c", Integer.MAX_VALUE).write("d", Integer.MIN_VALUE).write("e", -198766172L).write("f", 188.001d).writeEnd()
        .writeEnd().close();
        assertEquals("[null,{\"a\":" + Long.MAX_VALUE + ",\"b\":" + Long.MIN_VALUE + ",\"c\":" + Integer.MAX_VALUE + ",\"d\":"
                + Integer.MIN_VALUE + ",\"e\":-198766172,\"f\":188.001}]", new String(baos.toByteArray()));
    }

    @Test
    public void integralNumbersSmall() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeNull().writeStartObject().write("a", 1).write("b", 1L).write("c", -6)
                .write("d", -6L).write("e", 0).write("f", 0L).writeEnd().writeEnd().close();
        assertEquals("[null,{\"a\":1,\"b\":1,\"c\":-6,\"d\":-6,\"e\":0,\"f\":0}]", new String(baos.toByteArray()));
    }

    @Test
    public void integralNumbersSmall2() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeNull().writeStartObject().write("a", 10).write("b", 10L).write("c", -10)
                .write("d", -10L).write("e", 9).write("f", 9L).writeEnd().writeEnd().close();
        assertEquals("[null,{\"a\":10,\"b\":10,\"c\":-10,\"d\":-10,\"e\":9,\"f\":9}]", new String(baos.toByteArray()));
    }

    @Test
    public void numbers2() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeNull().writeStartObject().write("a", 999999999L).write("b", 123)
                .write("c", -444444444L).write("d", -123).writeEnd().writeEnd().close();
        assertEquals("[null,{\"a\":999999999,\"b\":123,\"c\":-444444444,\"d\":-123}]", new String(baos.toByteArray()));
    }

    @Test
    public void arrayInArray() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Json.createGenerator(baos).writeStartArray().writeStartArray().writeNull().writeEnd().writeEnd().close();
        assertEquals("[[null]]", new String(baos.toByteArray()));
    }

    @Test
    public void generate() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final JsonGenerator generator = Json.createGenerator(baos);

        generator.writeStartObject().write("firstName", "John").write("lastName", "Smith").write("age", 25).writeStartObject("address")
                .write("streetAddress", "21 2nd Street").write("city", "New York").write("state", "NY").write("postalCode", "10021")
                .writeEnd().writeStartArray("phoneNumber").writeStartObject().write("type", "home").write("number", "212 555-1234")
                .writeEnd().writeStartObject().write("type", "fax").write("number", "646 555-4567").writeEnd().writeEnd().writeEnd()
                .close();

        assertEquals("{\"firstName\":\"John\",\"lastName\":\"Smith\",\"age\":25,\"address\":"
                + "{\"streetAddress\":\"21 2nd Street\",\"city\":\"New York\",\"state\":\"NY\",\"postalCode\":\"10021\"},"
                + "\"phoneNumber\":[{\"type\":\"home\",\"number\":\"212 555-1234\"},{\"type\":\"fax\",\"number\":\"646 555-4567\"}]}",
                new String(baos.toByteArray()));
    }

    @Test
    public void pretty() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final JsonGenerator generator = Json.createGeneratorFactory(new HashMap<String, Object>() {
            {
                put(JsonGenerator.PRETTY_PRINTING, true);
            }
        }).createGenerator(baos);

        generator.writeStartObject().write("firstName", "John").write("lastName", "Smith").write("age", 25).writeStartObject("address")
                .write("streetAddress", "21 2nd Street").write("city", "New York").write("state", "NY").write("postalCode", "10021")
                .writeEnd().writeStartArray("phoneNumber").writeStartObject().write("type", "home").write("number", "212 555-1234")
                .writeEnd().writeStartObject().write("type", "fax").write("number", "646 555-4567").writeEnd().writeEnd().writeEnd()
                .close();

        assertEquals("{\n" + "  \"firstName\":\"John\",\n" + "  \"lastName\":\"Smith\",\n" + "  \"age\":25,\n" + "  \"address\":{\n"
                + "    \"streetAddress\":\"21 2nd Street\",\n" + "    \"city\":\"New York\",\n" + "    \"state\":\"NY\",\n"
                + "    \"postalCode\":\"10021\"\n" + "  },\n" + "  \"phoneNumber\":[\n" + "    {\n" + "      \"type\":\"home\",\n"
                + "      \"number\":\"212 555-1234\"\n" + "    },\n" + "    {\n" + "      \"type\":\"fax\",\n"
                + "      \"number\":\"646 555-4567\"\n" + "    }\n" + "  ]\n" + "}", new String(baos.toByteArray()));
    }

    @Test
    public void prettySimple() {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final JsonGenerator generator = Json.createGeneratorFactory(new HashMap<String, Object>() {
            {
                put(JsonGenerator.PRETTY_PRINTING, true);
            }
        }).createGenerator(baos);

        generator.writeStartObject().write("firstName", "John").writeEnd().close();

        assertEquals("{\n" + "  \"firstName\":\"John\"\n" + "}", new String(baos.toByteArray()));
    }

    @Test
    public void prettySimpleStructure() {
        final JsonWriterFactory writerFactory = Json.createWriterFactory(new HashMap<String, Object>() {
            {
                put(JsonGenerator.PRETTY_PRINTING, true);
            }
        });

        final StringWriter buffer = new StringWriter();

        final JsonWriter writer = writerFactory.createWriter(buffer);
        writer.write(Json.createObjectBuilder().add("firstName", "John").build());
        writer.close();

        assertEquals("{\n" + "  \"firstName\":\"John\"\n" + "}", buffer.toString());
    }

    @Test
    public void prettySimpleWriter() {

        final JsonWriterFactory writerFactory = Json.createWriterFactory(new HashMap<String, Object>() {
            {
                put(JsonGenerator.PRETTY_PRINTING, true);
            }
        });

        final StringWriter buffer = new StringWriter();

        final JsonReader reader = Json.createReader(new ByteArrayInputStream("{\"firstName\":\"John\"}".getBytes()));
        final JsonWriter writer = writerFactory.createWriter(buffer);
        writer.write(reader.read());
        writer.close();
        reader.close();

        assertEquals("{\n" + "  \"firstName\":\"John\"\n" + "}", buffer.toString());
    }
}