1.9.10/src/test/org/codehaus/jackson/main/TestPrettyPrinter.java

package org.codehaus.jackson.main;

import org.codehaus.jackson.*;
import org.codehaus.jackson.util.MinimalPrettyPrinter;

import java.io.*;

/**
 * Set of basic unit tests for verifying that indenting
 * option of generator works correctly
 */
public class TestPrettyPrinter
    extends main.BaseTest
{
    public void testSimpleDocWithDefault() throws Exception
    {
        StringWriter sw = new StringWriter();
        JsonGenerator gen = new JsonFactory().createJsonGenerator(sw);
        gen.useDefaultPrettyPrinter();
        _verifyPrettyPrinter(gen, sw);
    }

    public void testSimpleDocWithMinimal() throws Exception
    {
        StringWriter sw = new StringWriter();
        JsonGenerator gen = new JsonFactory().createJsonGenerator(sw);
        // first with standard minimal
        gen.setPrettyPrinter(new MinimalPrettyPrinter());
        String docStr = _verifyPrettyPrinter(gen, sw);
        // which should have no linefeeds, tabs
        assertEquals(-1, docStr.indexOf('\n'));
        assertEquals(-1, docStr.indexOf('\t'));

        // And then with slightly customized variant
        gen = new JsonFactory().createJsonGenerator(sw);
        gen.setPrettyPrinter(new MinimalPrettyPrinter() {
            @Override
            // use TAB between array values
            public void beforeArrayValues(JsonGenerator jg) throws IOException, JsonGenerationException
            {
                jg.writeRaw("\t");
            }
        });
        docStr = _verifyPrettyPrinter(gen, sw);
        assertEquals(-1, docStr.indexOf('\n'));
        assertTrue(docStr.indexOf('\t') >= 0);
    }
    
    private String _verifyPrettyPrinter(JsonGenerator gen, StringWriter sw) throws Exception
    {    
        gen.writeStartArray();
        gen.writeNumber(3);
        gen.writeString("abc");

        gen.writeStartArray();
        gen.writeBoolean(true);
        gen.writeEndArray();

        gen.writeStartObject();
        gen.writeFieldName("f");
        gen.writeNull();
        gen.writeFieldName("f2");
        gen.writeNull();
        gen.writeEndObject();

        gen.writeEndArray();
        gen.close();

        String docStr = sw.toString();
        JsonParser jp = createParserUsingReader(docStr);

        assertEquals(JsonToken.START_ARRAY, jp.nextToken());

        assertEquals(JsonToken.VALUE_NUMBER_INT, jp.nextToken());
        assertEquals(3, jp.getIntValue());
        assertEquals(JsonToken.VALUE_STRING, jp.nextToken());
        assertEquals("abc", jp.getText());

        assertEquals(JsonToken.START_ARRAY, jp.nextToken());
        assertEquals(JsonToken.VALUE_TRUE, jp.nextToken());
        assertEquals(JsonToken.END_ARRAY, jp.nextToken());

        assertEquals(JsonToken.START_OBJECT, jp.nextToken());
        assertEquals(JsonToken.FIELD_NAME, jp.nextToken());
        assertEquals("f", jp.getText());
        assertEquals(JsonToken.VALUE_NULL, jp.nextToken());
        assertEquals(JsonToken.FIELD_NAME, jp.nextToken());
        assertEquals("f2", jp.getText());
        assertEquals(JsonToken.VALUE_NULL, jp.nextToken());
        assertEquals(JsonToken.END_OBJECT, jp.nextToken());

        assertEquals(JsonToken.END_ARRAY, jp.nextToken());

        jp.close();

        return docStr;
    }
}