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Android example source code file (LoggingPrintStreamTest.java)

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

Java - Android tags/keywords

bar, bob, exception, foo, foo\nbar\ntee, google, io, name, object, string, stringbuilder, tee, testprintstream, throwable, utf-8, util

The LoggingPrintStreamTest.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed 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 com.android.internal.os;

import junit.framework.TestCase;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class LoggingPrintStreamTest extends TestCase {

    TestPrintStream out = new TestPrintStream();

    public void testPrintException() {
        @SuppressWarnings("ThrowableInstanceNeverThrown")
        Throwable t = new Throwable("Ignore me.");

        StringWriter sout = new StringWriter();
        t.printStackTrace(new PrintWriter(sout));

        t.printStackTrace(out);
        // t.printStackTrace();

        String[] lines = sout.toString().split("\\n");
        assertEquals(Arrays.asList(lines), out.lines);
    }

    public void testPrintObject() {
        Object o = new Object();
        out.print(4);
        out.print(o);
        out.print(2);
        out.flush();
        assertEquals(Arrays.asList("4" + o + "2"), out.lines);
    }

    public void testPrintlnObject() {
        Object o = new Object();
        out.print(4);
        out.println(o);
        out.print(2);
        out.flush();
        assertEquals(Arrays.asList("4" + o, "2"), out.lines);
    }

    public void testPrintf() {
        out.printf("Name: %s\nEmployer: %s", "Bob", "Google");
        assertEquals(Arrays.asList("Name: Bob"), out.lines);
        out.flush();
        assertEquals(Arrays.asList("Name: Bob", "Employer: Google"), out.lines);
    }

    public void testPrintInt() {
        out.print(4);
        out.print(2);
        assertTrue(out.lines.isEmpty());
        out.flush();
        assertEquals(Collections.singletonList("42"), out.lines);
    }

    public void testPrintlnInt() {
        out.println(4);
        out.println(2);
        assertEquals(Arrays.asList("4", "2"), out.lines);
    }

    public void testPrintCharArray() {
        out.print("Foo\nBar\nTee".toCharArray());
        assertEquals(Arrays.asList("Foo", "Bar"), out.lines);
        out.flush();
        assertEquals(Arrays.asList("Foo", "Bar", "Tee"), out.lines);
    }

    public void testPrintString() {
        out.print("Foo\nBar\nTee");
        assertEquals(Arrays.asList("Foo", "Bar"), out.lines);
        out.flush();
        assertEquals(Arrays.asList("Foo", "Bar", "Tee"), out.lines);
    }

    public void testPrintlnCharArray() {
        out.println("Foo\nBar\nTee".toCharArray());
        assertEquals(Arrays.asList("Foo", "Bar", "Tee"), out.lines);
    }

    public void testPrintlnString() {
        out.println("Foo\nBar\nTee");
        assertEquals(Arrays.asList("Foo", "Bar", "Tee"), out.lines);
    }

    public void testPrintlnStringWithBufferedData() {
        out.print(5);
        out.println("Foo\nBar\nTee");
        assertEquals(Arrays.asList("5Foo", "Bar", "Tee"), out.lines);
    }

    public void testAppend() {
        out.append("Foo\n")
            .append('4')
            .append('\n')
            .append("Bar", 1, 2)
            .append('\n');
        assertEquals(Arrays.asList("Foo", "4", "a"), out.lines);
    }

    public void testMultiByteCharactersSpanningBuffers() throws Exception {
        // assume 3*1000 bytes won't fit in LoggingPrintStream's internal buffer
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < 1000; i++) {
            builder.append("\u20AC"); // a Euro character; 3 bytes in UTF-8
        }
        String expected = builder.toString();

        out.write(expected.getBytes("UTF-8"));
        out.flush();
        assertEquals(Arrays.asList(expected), out.lines);
    }

    public void testWriteOneByteAtATimeMultibyteCharacters() throws Exception {
        String expected = " \u20AC  \u20AC   \u20AC    \u20AC     ";
        for (byte b : expected.getBytes()) {
            out.write(b);
        }
        out.flush();
        assertEquals(Arrays.asList(expected), out.lines);
    }

    public void testWriteByteArrayAtATimeMultibyteCharacters() throws Exception {
        String expected = " \u20AC  \u20AC   \u20AC    \u20AC     ";
        out.write(expected.getBytes());
        out.flush();
        assertEquals(Arrays.asList(expected), out.lines);
    }

    public void testWriteWithOffsetsMultibyteCharacters() throws Exception {
        String expected = " \u20AC  \u20AC   \u20AC    \u20AC     ";
        byte[] bytes = expected.getBytes();
        int i = 0;
        while (i < bytes.length - 5) {
            out.write(bytes, i, 5);
            i += 5;
        }
        out.write(bytes, i, bytes.length - i);
        out.flush();
        assertEquals(Arrays.asList(expected), out.lines);
    }

    public void testWriteFlushesOnNewlines() throws Exception {
        String a = " \u20AC  \u20AC ";
        String b = "  \u20AC    \u20AC  ";
        String c = "   ";
        String toWrite = a + "\n" + b + "\n" + c;
        out.write(toWrite.getBytes());
        out.flush();
        assertEquals(Arrays.asList(a, b, c), out.lines);
    }

    static class TestPrintStream extends LoggingPrintStream {

        final List<String> lines = new ArrayList();

        protected void log(String line) {
            lines.add(line);
        }
    }
}

Other Android examples (source code examples)

Here is a short list of links related to this Android LoggingPrintStreamTest.java source code file:

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