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Merge pull request eugenp#2 from eugenp/master
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‎core-java-io/src/test/java/com/baeldung/filechannel/FileChannelUnitTest.java‎

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package com.baeldung.filechannel;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNotNull;
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import java.io.ByteArrayOutputStream;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.nio.ByteBuffer;
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import java.nio.MappedByteBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.channels.FileLock;
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import java.nio.charset.StandardCharsets;
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import org.junit.Test;
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public class FileChannelUnitTest {
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@Test
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public void givenFile_whenReadWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
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try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
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FileChannel channel = reader.getChannel();
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ByteArrayOutputStream out = new ByteArrayOutputStream();) {
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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while (channel.read(buff) > 0) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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String fileContent = new String(out.toByteArray(), StandardCharsets.UTF_8);
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assertEquals("Hello world", fileContent);
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}
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}
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@Test
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public void givenFile_whenReadWithFileChannelUsingFileInputStream_thenCorrect() throws IOException {
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try (ByteArrayOutputStream out = new ByteArrayOutputStream();
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FileInputStream fin = new FileInputStream("src/test/resources/test_read.in");
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FileChannel channel = fin.getChannel();) {
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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while (channel.read(buff) > 0) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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String fileContent = new String(out.toByteArray(), StandardCharsets.UTF_8);
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assertEquals("Hello world", fileContent);
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}
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}
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@Test
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public void givenFile_whenReadAFileSectionIntoMemoryWithFileChannel_thenCorrect() throws IOException {
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try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
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FileChannel channel = reader.getChannel();
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ByteArrayOutputStream out = new ByteArrayOutputStream();) {
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MappedByteBuffer buff = channel.map(FileChannel.MapMode.READ_ONLY, 6, 5);
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if (buff.hasRemaining()) {
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byte[] data = new byte[buff.remaining()];
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buff.get(data);
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assertEquals("world", new String(data, StandardCharsets.UTF_8));
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}
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}
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}
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@Test
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public void whenWriteWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
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String file = "src/test/resources/test_write_using_filechannel.txt";
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try (RandomAccessFile writer = new RandomAccessFile(file, "rw");
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FileChannel channel = writer.getChannel();) {
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ByteBuffer buff = ByteBuffer.wrap("Hello world".getBytes(StandardCharsets.UTF_8));
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channel.write(buff);
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// now we verify whether the file was written correctly
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RandomAccessFile reader = new RandomAccessFile(file, "r");
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assertEquals("Hello world", reader.readLine());
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reader.close();
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}
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}
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@Test
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public void givenFile_whenWriteAFileUsingLockAFileSectionWithFileChannel_thenCorrect() throws IOException {
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try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "rw");
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FileChannel channel = reader.getChannel();
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FileLock fileLock = channel.tryLock(6, 5, Boolean.FALSE);) {
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assertNotNull(fileLock);
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}
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}
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@Test
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public void givenFile_whenReadWithFileChannelGetPosition_thenCorrect() throws IOException {
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try (ByteArrayOutputStream out = new ByteArrayOutputStream();
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RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
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FileChannel channel = reader.getChannel();) {
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int bufferSize = 1024;
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if (bufferSize > channel.size()) {
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bufferSize = (int) channel.size();
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}
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ByteBuffer buff = ByteBuffer.allocate(bufferSize);
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while (channel.read(buff) > 0) {
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out.write(buff.array(), 0, buff.position());
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buff.clear();
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}
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// the original file is 11 bytes long, so that's where the position pointer should be
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assertEquals(11, channel.position());
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channel.position(4);
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assertEquals(4, channel.position());
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}
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}
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@Test
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public void whenGetFileSize_thenCorrect() throws IOException {
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try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
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FileChannel channel = reader.getChannel();) {
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// the original file is 11 bytes long, so that's where the position pointer should be
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assertEquals(11, channel.size());
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}
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}
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@Test
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public void whenTruncateFile_thenCorrect() throws IOException {
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String input = "this is a test input";
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FileOutputStream fout = new FileOutputStream("src/test/resources/test_truncate.txt");
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FileChannel channel = fout.getChannel();
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ByteBuffer buff = ByteBuffer.wrap(input.getBytes());
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channel.write(buff);
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buff.flip();
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channel = channel.truncate(5);
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assertEquals(5, channel.size());
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fout.close();
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channel.close();
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}
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}

‎core-java-io/src/test/resources/test_truncate.txt‎

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this

‎core-java-io/src/test/resources/test_write_using_filechannel.txt‎

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Hello world

‎guava-collections-set/.gitignore‎

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*.class
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#folders#
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/target
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/neoDb*
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/data
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/src/main/webapp/WEB-INF/classes
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*/META-INF/*
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# Packaged files #
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*.jar
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*.war
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*.ear

‎guava-collections-set/pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>guava-collections-set</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>guava-collections-set</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-java</relativePath>
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</parent>
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<dependencies>
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<!-- test scoped -->
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>guava-collections-set</finalName>
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</build>
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<properties>
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<!-- util -->
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<guava.version>27.1-jre</guava.version>
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<!-- testing -->
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<assertj.version>3.6.1</assertj.version>
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</properties>
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</project>

‎guava-collections-set/src/test/java/org/baeldung/guava/GuavaMultiSetUnitTest.java‎

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package org.baeldung.guava;
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import com.google.common.collect.HashMultiset;
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import com.google.common.collect.Multiset;
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import org.junit.Test;
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import java.util.HashMap;
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import java.util.Map;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.assertThatThrownBy;
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public class GuavaMultiSetUnitTest {
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@Test
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public void givenMultiSet_whenAddingValues_shouldReturnCorrectCount() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.add("Potter");
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bookStore.add("Potter");
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bookStore.add("Potter");
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assertThat(bookStore.contains("Potter")).isTrue();
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assertThat(bookStore.count("Potter")).isEqualTo(3);
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}
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@Test
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public void givenMultiSet_whenRemovingValues_shouldReturnCorrectCount() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.add("Potter");
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bookStore.add("Potter");
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bookStore.remove("Potter");
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assertThat(bookStore.contains("Potter")).isTrue();
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assertThat(bookStore.count("Potter")).isEqualTo(1);
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}
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@Test
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public void givenMultiSet_whenSetCount_shouldReturnCorrectCount() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.setCount("Potter", 50);
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assertThat(bookStore.count("Potter")).isEqualTo(50);
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}
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@Test
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public void givenMultiSet_whenSettingNegativeCount_shouldThrowException() {
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Multiset<String> bookStore = HashMultiset.create();
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assertThatThrownBy(() -> bookStore.setCount("Potter", -1))
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.isInstanceOf(IllegalArgumentException.class);
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}
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@Test
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public void givenMultiSet_whenSettingCountWithEmptySet_shouldBeSuccessful() {
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Multiset<String> bookStore = HashMultiset.create();
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assertThat(bookStore.setCount("Potter", 0, 2)).isTrue();
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}
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@Test
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public void givenMultiSet_whenSettingCountWithCorrectValue_shouldBeSuccessful() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.add("Potter");
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bookStore.add("Potter");
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assertThat(bookStore.setCount("Potter", 2, 52)).isTrue();
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}
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@Test
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public void givenMultiSet_whenSettingCountWithIncorrectValue_shouldFail() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.add("Potter");
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bookStore.add("Potter");
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assertThat(bookStore.setCount("Potter", 5, 52)).isFalse();
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}
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@Test
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public void givenMap_compareMultiSetOperations() {
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Map<String, Integer> bookStore = new HashMap<>();
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bookStore.put("Potter", 3);
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assertThat(bookStore.containsKey("Potter")).isTrue();
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assertThat(bookStore.get("Potter")).isEqualTo(3);
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bookStore.put("Potter", 2);
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assertThat(bookStore.get("Potter")).isEqualTo(2);
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bookStore.put("Potter", null);
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assertThat(bookStore.containsKey("Potter")).isTrue();
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bookStore.put("Potter", -1);
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assertThat(bookStore.containsKey("Potter")).isTrue();
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}
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}

‎jackson-simple/.gitignore‎

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*.class
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#folders#
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/target
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/neoDb*
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/data
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/src/main/webapp/WEB-INF/classes
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*/META-INF/*
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# Packaged files #
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*.jar
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*.war
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*.ear

‎jackson-simple/README.md‎

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=========
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### Jackson Articles that are also part of the e-book
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###The Course
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The "REST With Spring" Classes: http://bit.ly/restwithspring
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### Relevant Articles:
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- [Jackson Ignore Properties on Marshalling](http://www.baeldung.com/jackson-ignore-properties-on-serialization)
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- [Jackson Unmarshalling json with Unknown Properties](http://www.baeldung.com/jackson-deserialize-json-unknown-properties)
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- [Jackson Annotation Examples](http://www.baeldung.com/jackson-annotations)
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- [Intro to the Jackson ObjectMapper](http://www.baeldung.com/jackson-object-mapper-tutorial)
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- [Ignore Null Fields with Jackson](http://www.baeldung.com/jackson-ignore-null-fields)
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- [Jackson – Change Name of Field](http://www.baeldung.com/jackson-name-of-property)

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