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Commons IO example source code file (XmlStreamReaderTest.java)

This example Commons IO source code file (XmlStreamReaderTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons IO tags/keywords

exception, io, messageformat, string, string, text, us-ascii, us-ascii, utf-16, utf-16be, utf-16be, utf-16be-bom, utf-8, utf-8, utf-8-bom, util, xmlstreamreader

The Commons IO XmlStreamReaderTest.java source code

/*
 * 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 under the License.
 */
package org.apache.commons.io.input;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;

import junit.framework.TestCase;

/**
 * @author Alejandro Abdelnur
 */
public class XmlStreamReaderTest extends TestCase {
    private static final String XML5 = "xml-prolog-encoding-spaced-single-quotes";
    private static final String XML4 = "xml-prolog-encoding-single-quotes";
    private static final String XML3 = "xml-prolog-encoding-double-quotes";
    private static final String XML2 = "xml-prolog";
    private static final String XML1 = "xml";

    protected void _testRawNoBomValid(String encoding) throws Exception {
        InputStream is = getXmlStream("no-bom", XML1, encoding, encoding);
        XmlStreamReader xmlReader = new XmlStreamReader(is, false);
        assertEquals(xmlReader.getEncoding(), "UTF-8");

        is = getXmlStream("no-bom", XML2, encoding, encoding);
        xmlReader = new XmlStreamReader(is);
        assertEquals(xmlReader.getEncoding(), "UTF-8");

        is = getXmlStream("no-bom", XML3, encoding, encoding);
        xmlReader = new XmlStreamReader(is);
        assertEquals(xmlReader.getEncoding(), encoding);

        is = getXmlStream("no-bom", XML4, encoding, encoding);
        xmlReader = new XmlStreamReader(is);
        assertEquals(xmlReader.getEncoding(), encoding);

        is = getXmlStream("no-bom", XML5, encoding, encoding);
        xmlReader = new XmlStreamReader(is);
        assertEquals(xmlReader.getEncoding(), encoding);
    }

    protected void _testRawNoBomInvalid(String encoding) throws Exception {
        InputStream is = getXmlStream("no-bom", XML3, encoding, encoding);
        try {
            new XmlStreamReader(is, false);
            fail("It should have failed");
        } catch (IOException ex) {
            assertTrue(ex.getMessage().indexOf("Invalid encoding,") > -1);
        }
    }

    public void testRawNoBom() throws Exception {
        _testRawNoBomValid("US-ASCII");
        _testRawNoBomValid("UTF-8");
        _testRawNoBomValid("ISO-8859-1");
        _testRawNoBomValid("CP1047");
    }

    protected void _testRawBomValid(String encoding) throws Exception {
        InputStream is = getXmlStream(encoding + "-bom", XML3, encoding,
                encoding);
        XmlStreamReader xmlReader = new XmlStreamReader(is, false);
        if (!encoding.equals("UTF-16")) {
            assertEquals(xmlReader.getEncoding(), encoding);
        } else {
            assertEquals(xmlReader.getEncoding()
                    .substring(0, encoding.length()), encoding);
        }
    }

    protected void _testRawBomInvalid(String bomEnc, String streamEnc,
            String prologEnc) throws Exception {
        InputStream is = getXmlStream(bomEnc, XML3, streamEnc, prologEnc);
        try {
            XmlStreamReader xmlReader = new XmlStreamReader(is, false);
            String foundEnc = xmlReader.getEncoding();
            fail("It should have failed for BOM " + bomEnc + ", streamEnc "
                    + streamEnc + " and prologEnc " + prologEnc + ": found "
                    + foundEnc);
        } catch (IOException ex) {
            assertTrue(ex.getMessage().indexOf("Invalid encoding,") > -1);
        }
    }

    public void testRawBom() throws Exception {
        _testRawBomValid("UTF-8");
        _testRawBomValid("UTF-16BE");
        _testRawBomValid("UTF-16LE");
        _testRawBomValid("UTF-16");

        _testRawBomInvalid("UTF-8-bom", "US-ASCII", "US-ASCII");
        _testRawBomInvalid("UTF-8-bom", "ISO-8859-1", "ISO-8859-1");
        _testRawBomInvalid("UTF-8-bom", "UTF-8", "UTF-16");
        _testRawBomInvalid("UTF-8-bom", "UTF-8", "UTF-16BE");
        _testRawBomInvalid("UTF-8-bom", "UTF-8", "UTF-16LE");
        _testRawBomInvalid("UTF-16BE-bom", "UTF-16BE", "UTF-16LE");
        _testRawBomInvalid("UTF-16LE-bom", "UTF-16LE", "UTF-16BE");
        _testRawBomInvalid("UTF-16LE-bom", "UTF-16LE", "UTF-8");
    }

    public void testHttp() throws Exception {
        // niallp 2010-10-06 - remove following 2 tests - I reinstated
        // checks for non-UTF-16 encodings (18 tests) and these failed 
        //_testHttpValid("application/xml", "no-bom", "US-ASCII", null);
        //_testHttpValid("application/xml", "UTF-8-bom", "US-ASCII", null);
        _testHttpValid("application/xml", "UTF-8-bom", "UTF-8", null);
        _testHttpValid("application/xml", "UTF-8-bom", "UTF-8", "UTF-8");
        _testHttpValid("application/xml;charset=UTF-8", "UTF-8-bom", "UTF-8",
                null);
        _testHttpValid("application/xml;charset=\"UTF-8\"", "UTF-8-bom",
                "UTF-8", null);
        _testHttpValid("application/xml;charset='UTF-8'", "UTF-8-bom", "UTF-8",
                null);
        _testHttpValid("application/xml;charset=UTF-8", "UTF-8-bom", "UTF-8",
                "UTF-8");
        _testHttpValid("application/xml;charset=UTF-16", "UTF-16BE-bom",
                "UTF-16BE", null);
        _testHttpValid("application/xml;charset=UTF-16", "UTF-16BE-bom",
                "UTF-16BE", "UTF-16");
        _testHttpValid("application/xml;charset=UTF-16", "UTF-16BE-bom",
                "UTF-16BE", "UTF-16BE");

        _testHttpInvalid("application/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", null);
        _testHttpInvalid("application/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", "UTF-16");
        _testHttpInvalid("application/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", "UTF-16BE");
        _testHttpInvalid("application/xml", "UTF-8-bom", "US-ASCII", "US-ASCII");
        _testHttpInvalid("application/xml;charset=UTF-16", "UTF-16LE", "UTF-8",
                "UTF-8");
        _testHttpInvalid("application/xml;charset=UTF-16", "no-bom",
                "UTF-16BE", "UTF-16BE");

        _testHttpValid("text/xml", "no-bom", "US-ASCII", null);
        _testHttpValid("text/xml;charset=UTF-8", "UTF-8-bom", "UTF-8", "UTF-8");
        _testHttpValid("text/xml;charset=UTF-8", "UTF-8-bom", "UTF-8", null);
        _testHttpValid("text/xml;charset=UTF-16", "UTF-16BE-bom", "UTF-16BE",
                null);
        _testHttpValid("text/xml;charset=UTF-16", "UTF-16BE-bom", "UTF-16BE",
                "UTF-16");
        _testHttpValid("text/xml;charset=UTF-16", "UTF-16BE-bom", "UTF-16BE",
                "UTF-16BE");
        _testHttpValid("text/xml", "UTF-8-bom", "US-ASCII", null);

        _testAlternateDefaultEncoding("application/xml", "UTF-8-bom", "UTF-8",
                null, null);
        _testAlternateDefaultEncoding("application/xml", "no-bom", "US-ASCII",
                null, "US-ASCII");
        _testAlternateDefaultEncoding("application/xml", "UTF-8-bom", "UTF-8",
                null, "UTF-8");
        _testAlternateDefaultEncoding("text/xml", "no-bom", "US-ASCII", null,
                null);
        _testAlternateDefaultEncoding("text/xml", "no-bom", "US-ASCII", null,
                "US-ASCII");
        _testAlternateDefaultEncoding("text/xml", "no-bom", "US-ASCII", null,
                "UTF-8");

        _testHttpInvalid("text/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", null);
        _testHttpInvalid("text/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", "UTF-16");
        _testHttpInvalid("text/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", "UTF-16BE");
        _testHttpInvalid("text/xml;charset=UTF-16", "no-bom", "UTF-16BE",
                "UTF-16BE");
        _testHttpInvalid("text/xml;charset=UTF-16", "no-bom", "UTF-16BE", null);

        _testHttpLenient("text/xml", "no-bom", "US-ASCII", null, "US-ASCII");
        _testHttpLenient("text/xml;charset=UTF-8", "UTF-8-bom", "UTF-8",
                "UTF-8", "UTF-8");
        _testHttpLenient("text/xml;charset=UTF-8", "UTF-8-bom", "UTF-8", null,
                "UTF-8");
        _testHttpLenient("text/xml;charset=UTF-16", "UTF-16BE-bom", "UTF-16BE",
                null, "UTF-16BE");
        _testHttpLenient("text/xml;charset=UTF-16", "UTF-16BE-bom", "UTF-16BE",
                "UTF-16", "UTF-16");
        _testHttpLenient("text/xml;charset=UTF-16", "UTF-16BE-bom", "UTF-16BE",
                "UTF-16BE", "UTF-16BE");
        _testHttpLenient("text/xml", "UTF-8-bom", "US-ASCII", null, "US-ASCII");

        _testHttpLenient("text/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", null, "UTF-16BE");
        _testHttpLenient("text/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", "UTF-16", "UTF-16");
        _testHttpLenient("text/xml;charset=UTF-16BE", "UTF-16BE-bom",
                "UTF-16BE", "UTF-16BE", "UTF-16BE");
        _testHttpLenient("text/xml;charset=UTF-16", "no-bom", "UTF-16BE",
                "UTF-16BE", "UTF-16BE");
        _testHttpLenient("text/xml;charset=UTF-16", "no-bom", "UTF-16BE", null,
                "UTF-16");

        _testHttpLenient("text/html", "no-bom", "US-ASCII", "US-ASCII",
                "US-ASCII");
        _testHttpLenient("text/html", "no-bom", "US-ASCII", null, "US-ASCII");
        _testHttpLenient("text/html;charset=UTF-8", "no-bom", "US-ASCII",
                "UTF-8", "UTF-8");
        _testHttpLenient("text/html;charset=UTF-16BE", "no-bom", "US-ASCII",
                "UTF-8", "UTF-8");
    }

    public void _testAlternateDefaultEncoding(String cT, String bomEnc,
            String streamEnc, String prologEnc, String alternateEnc)
            throws Exception {
        InputStream is = getXmlStream(bomEnc, (prologEnc == null) ? XML1
                : XML3, streamEnc, prologEnc);
        XmlStreamReader xmlReader = new XmlStreamReader(is, cT, false, alternateEnc);
        if (!streamEnc.equals("UTF-16")) {
            // we can not assert things here because UTF-8, US-ASCII and
            // ISO-8859-1 look alike for the chars used for detection
            // (niallp 2010-10-06 - I re-instated the check below - the tests(6) passed)
            String enc = (alternateEnc != null) ? alternateEnc : streamEnc;
            assertEquals(xmlReader.getEncoding(), enc);
        } else {
            //String enc = (alternateEnc != null) ? alternateEnc : streamEnc;
            assertEquals(xmlReader.getEncoding().substring(0,
                    streamEnc.length()), streamEnc);
        }
    }

    public void _testHttpValid(String cT, String bomEnc, String streamEnc,
            String prologEnc) throws Exception {
        InputStream is = getXmlStream(bomEnc,
                (prologEnc == null) ? XML1 : XML3, streamEnc, prologEnc);
        XmlStreamReader xmlReader = new XmlStreamReader(is, cT, false);
        if (!streamEnc.equals("UTF-16")) {
            // we can not assert things here because UTF-8, US-ASCII and
            // ISO-8859-1 look alike for the chars used for detection
            // (niallp 2010-10-06 - I re-instated the check below and removed the 2 tests that failed)
            assertEquals(xmlReader.getEncoding(), streamEnc);
        } else {
            assertEquals(xmlReader.getEncoding().substring(0,
                    streamEnc.length()), streamEnc);
        }
    }

    protected void _testHttpInvalid(String cT, String bomEnc, String streamEnc,
            String prologEnc) throws Exception {
        InputStream is = getXmlStream(bomEnc,
                (prologEnc == null) ? XML2 : XML3, streamEnc, prologEnc);
        try {
            new XmlStreamReader(is, cT, false);
            fail("It should have failed for HTTP Content-type " + cT + ", BOM "
                    + bomEnc + ", streamEnc " + streamEnc + " and prologEnc "
                    + prologEnc);
        } catch (IOException ex) {
            assertTrue(ex.getMessage().indexOf("Invalid encoding,") > -1);
        }
    }

    protected void _testHttpLenient(String cT, String bomEnc, String streamEnc,
            String prologEnc, String shouldbe) throws Exception {
        InputStream is = getXmlStream(bomEnc,
                (prologEnc == null) ? XML2 : XML3, streamEnc, prologEnc);
        XmlStreamReader xmlReader = new XmlStreamReader(is, cT, true);
        assertEquals(xmlReader.getEncoding(), shouldbe);
    }

    private static final String ENCODING_ATTRIBUTE_XML = "<?xml version=\"1.0\" ?> \n"
            + "<atom:feed xmlns:atom=\"http://www.w3.org/2005/Atom\">\n"
            + "\n"
            + "  <atom:entry>\n"
            + "    <atom:title encoding='base64'>();

    static {
        BOMs.put("no-bom", NO_BOM_BYTES);
        BOMs.put("UTF-16BE-bom", UTF_16BE_BOM_BYTES);
        BOMs.put("UTF-16LE-bom", UTF_16LE_BOM_BYTES);
        BOMs.put("UTF-16-bom", NO_BOM_BYTES); // it's added by the writer
        BOMs.put("UTF-8-bom", UTF_8_BOM_BYTES);
    }

    private static final MessageFormat XML = new MessageFormat(
            "<root>{2}");
    private static final MessageFormat XML_WITH_PROLOG = new MessageFormat(
            "<?xml version=\"1.0\"?>\n{2}");
    private static final MessageFormat XML_WITH_PROLOG_AND_ENCODING_DOUBLE_QUOTES = new MessageFormat(
            "<?xml version=\"1.0\" encoding=\"{1}\"?>\n{2}");
    private static final MessageFormat XML_WITH_PROLOG_AND_ENCODING_SINGLE_QUOTES = new MessageFormat(
            "<?xml version=\"1.0\" encoding=''{1}''?>\n{2}");
    private static final MessageFormat XML_WITH_PROLOG_AND_ENCODING_SPACED_SINGLE_QUOTES = new MessageFormat(
            "<?xml version=\"1.0\" encoding =  \t \n \r''{1}''?>\n{2}");

    private static final MessageFormat INFO = new MessageFormat(
            "\nBOM : {0}\nDoc : {1}\nStream Enc : {2}\nProlog Enc : {3}\n");

    private static final Map<String,MessageFormat> XMLs = new HashMap();

    static {
        XMLs.put(XML1, XML);
        XMLs.put(XML2, XML_WITH_PROLOG);
        XMLs.put(XML3, XML_WITH_PROLOG_AND_ENCODING_DOUBLE_QUOTES);
        XMLs.put(XML4, XML_WITH_PROLOG_AND_ENCODING_SINGLE_QUOTES);
        XMLs.put(XML5, XML_WITH_PROLOG_AND_ENCODING_SPACED_SINGLE_QUOTES);
    }

    /**
     *
     * @param bomType no-bom, UTF-16BE-bom, UTF-16LE-bom, UTF-8-bom
     * @param xmlType xml, xml-prolog, xml-prolog-charset
     * @return XML stream
     */
    protected InputStream getXmlStream(String bomType, String xmlType,
            String streamEnc, String prologEnc) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
        int[] bom = BOMs.get(bomType);
        if (bom == null) {
            bom = new int[0];
        }
        MessageFormat xml = XMLs.get(xmlType);
        for (int i = 0; i < bom.length; i++) {
            baos.write(bom[i]);
        }
        Writer writer = new OutputStreamWriter(baos, streamEnc);
        String info = INFO.format(new Object[] { bomType, xmlType, prologEnc });
        String xmlDoc = xml.format(new Object[] { streamEnc, prologEnc, info });
        writer.write(xmlDoc);

        // PADDDING TO TEST THINGS WORK BEYOND PUSHBACK_SIZE
        writer.write("<da>\n");
        for (int i = 0; i < 10000; i++) {
            writer.write("<do/>\n");
        }
        writer.write("</da>\n");

        writer.close();
        return new ByteArrayInputStream(baos.toByteArray());
    }
}

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