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Java example source code file (ExceptionContextTest.java)

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

Learn more about this Java project at its project page.

Java - Java tags/keywords

apache, bytearrayinputstream, bytearrayoutputstream, exception, exceptioncontext, exceptioncontexttest, ioexception, key, objectinputstream, objectoutputstream, string, test, unserializable, util, value

The ExceptionContextTest.java Java example 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.math3.exception.util;

import java.util.Locale;
import java.util.Arrays;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;

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

/**
 * Test for {@link ExceptionContext}.
 *
 */
public class ExceptionContextTest {
    @Test
    public void testMessageChain() {
        final ExceptionContext c = new ExceptionContext(new Exception("oops"));
        final String sep = " | "; // Non-default separator.
        final String m1 = "column index (0)";
        c.addMessage(LocalizedFormats.COLUMN_INDEX, 0);
        final String m2 = "got 1x2 but expected 3x4";
        c.addMessage(LocalizedFormats.DIMENSIONS_MISMATCH_2x2, 1, 2, 3, 4);
        final String m3 = "It didn't work out";
        c.addMessage(LocalizedFormats.SIMPLE_MESSAGE, m3);

        Assert.assertEquals(c.getMessage(Locale.US, sep),
                            m1 + sep + m2 + sep + m3);
    }

    @Test
    public void testNoArgAddMessage() {
        final ExceptionContext c = new ExceptionContext(new Exception("hello"));
        c.addMessage(LocalizedFormats.SIMPLE_MESSAGE);
        Assert.assertEquals(c.getMessage(), "{0}");
    }

    @Test
    public void testContext() {
        final ExceptionContext c = new ExceptionContext(new Exception("bye"));

        final String[] keys = {"Key 1", "Key 2"};
        final Object[] values = {"Value 1", Integer.valueOf(2)};

        for (int i = 0; i < keys.length; i++) {
            c.setValue(keys[i], values[i]);
        }

        // Check that all keys are present.
        Assert.assertTrue(c.getKeys().containsAll(Arrays.asList(keys)));

        // Check that all values are correctly stored.
        for (int i = 0; i < keys.length; i++) {
            Assert.assertEquals(values[i], c.getValue(keys[i]));
        }

        // Check behaviour on missing key.
        Assert.assertNull(c.getValue("xyz"));
    }

    @Test
    public void testSerialize()
        throws IOException,
               ClassNotFoundException {
        final ExceptionContext cOut = new ExceptionContext(new Exception("Apache"));
        cOut.addMessage(LocalizedFormats.COLUMN_INDEX, 0);
        cOut.setValue("Key 1", Integer.valueOf(0));

        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(cOut);

        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bis);
        ExceptionContext cIn = (ExceptionContext) ois.readObject();

        Assert.assertTrue(cOut.getMessage().equals(cIn.getMessage()));
        for (String key : cIn.getKeys()) {
            Assert.assertTrue(cOut.getValue(key).equals(cIn.getValue(key)));
        }
    }

    @Test
    public void testSerializeUnserializable() throws Exception {
        final ExceptionContext cOut = new ExceptionContext(new Exception("Apache Commons Math"));
        cOut.addMessage(LocalizedFormats.SIMPLE_MESSAGE, "OK");
        cOut.addMessage(LocalizedFormats.SIMPLE_MESSAGE, new Unserializable());
        String key = "Key 1";
        cOut.setValue(key, new Unserializable());

        {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(cOut);

            ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
            ObjectInputStream ois = new ObjectInputStream(bis);
            ExceptionContext cIn = (ExceptionContext) ois.readObject();

            String nsObjStr = (String) cIn.getValue(key);
            Assert.assertTrue(nsObjStr.matches(".*could not be serialized.*"));
        }
    }

    /**
     * Class used by {@link #testSerializeUnserializable()}.
     */
    private static class Unserializable {
        Unserializable() {}
    }
}

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