some modules, some domain logic, much adapters

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)
+.idea
+photoalbum-webapp/photoalbum-webapp.iml
+photoalbum.iml
+photoalbum-couchdb-adapter/photoalbum-couchdb-adapter.iml
+photoalbum-management/photoalbum-management.iml
+photoalbum-common/photoalbum-common.iml
+photoalbum-fileio-adapter/photoalbum-fileio-adapter.iml

photoalbum-common/pom.xml

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+<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <parent>
+ <artifactId>photoalbum</artifactId>
+ <groupId>com.mgu.photoalbum</groupId>
+ <version>0.1.0</version>
+ </parent>
+ <modelVersion>4.0.0</modelVersion>
+
+ <artifactId>photoalbum-common</artifactId>
+ <packaging>jar</packaging>
+
+ <name>photoalbum-common</name>
+ <url>https://maven.apache.org</url>
+
+ <properties>
+ <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+ </properties>
+
+ <dependencies>
+ <dependency>
+ <groupId>junit</groupId>
+ <artifactId>junit</artifactId>
+ <version>3.8.1</version>
+ <scope>test</scope>
+ </dependency>
+ </dependencies>
+</project>

photoalbum-common/src/main/java/com/mgu/photoalbum/exception/PhotoalbumException.java

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+package com.mgu.photoalbum.exception;
+
+abstract public class PhotoalbumException extends RuntimeException {
+
+ private static final long serialVersionUID = -8563374709814927511L;
+
+ public PhotoalbumException(final String message) {
+ super(message);
+ }
+
+ public PhotoalbumException(final Throwable cause) {
+ super(cause);
+ }
+
+ public PhotoalbumException(final String message, final Throwable cause) {
+ super(message, cause);
+ }
+
+ abstract public String getErrorCode();
+}

photoalbum-common/src/main/java/com/mgu/photoalbum/identity/IdGenerator.java

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+package com.mgu.photoalbum.identity;
+
+/**
+ * IDs are generally generated at the server-side upon client request over the alphabet [A-Za-z0-9]. This
+ * generator can be parameterized with an optional prefix and a length that the generated ID must adhere
+ * to.
+ *
+ * Most of the properties of strong passwords should be applied to IDs as well. Some IDs - for instance user IDs -
+ * should have a high level of entropy. With regard to strong passwords, NIST recommends an entropy of at least
+ * 78 bits. If we apply this recommendation to an ID within the context of the given the alphabet [A-Za-z0-9], a minimum
+ * length of 14 characters is advised. Thus, if the caller does not supply the length parameter, the default
+ * length is exactly 14 characters.
+ *
+ * @author Markus Günther ([email protected])
+ */
+public class IdGenerator {
+
+ private static final String ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVW" + "ABCDEFGHIJKLMNOPQRSTUVW".toLowerCase() + "0123456789";
+
+ private static final String WITHOUT_PREFIX = "";
+
+ private static final int DEFAULT_LENGTH = 14;
+
+ public String generateId() {
+ return generateId(WITHOUT_PREFIX, DEFAULT_LENGTH);
+ }
+
+ public String generateId(final int length) {
+ return generateId(WITHOUT_PREFIX, length);
+ }
+
+ public String generateId(final String prefix) {
+ return generateId(prefix, DEFAULT_LENGTH);
+ }
+
+ /**
+ * Generates an ID that adheres to the given parameters {@code prefix} and {@code length}. The prefix
+ * segment is separated using a '-' from the randomized segment.
+ *
+ * Example: Given the prefix 'CU' and a target length of 5, the ID 'CU-AbjEk' would be in the language
+ * that both parameters span in conjunction with the alphabet.
+ *
+ * @param prefix
+ * Optional prefix for the ID
+ * @param length
+ * Length of the randomized segment
+ * @return
+ * Generated ID with an optional prefix segment followed by a randomized segment, where both segments
+ * are delimited by a dash ('-')
+ */
+ public String generateId(final String prefix, final int length) {
+
+ final StringBuilder sb = new StringBuilder();
+
+ if (!prefix.equals(WITHOUT_PREFIX)) {
+ sb.append(prefix).append("-");
+ }
+
+ for (int i = 0; i < length; i++) {
+ final int randomIndex = (int) (Math.random() * ALPHABET.length());
+ sb.append(ALPHABET.charAt(randomIndex));
+ }
+
+ return sb.toString();
+ }
+}

photoalbum-couchdb-adapter/pom.xml

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+<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+ <modelVersion>4.0.0</modelVersion>
+
+ <parent>
+ <artifactId>photoalbum</artifactId>
+ <groupId>com.mgu.photoalbum</groupId>
+ <version>0.1.0</version>
+ </parent>
+
+ <artifactId>photoalbum-couchdb-adapter</artifactId>
+ <packaging>jar</packaging>
+
+ <name>[photoalbum] CouchDB Adapter</name>
+
+ <properties>
+ <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+ </properties>
+
+ <dependencies>
+ <dependency>
+ <groupId>org.ektorp</groupId>
+ <artifactId>org.ektorp</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.commons</groupId>
+ <artifactId>commons-lang3</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>joda-time</groupId>
+ <artifactId>joda-time</artifactId>
+ </dependency>
+ <!-- Test -->
+ <dependency>
+ <groupId>junit</groupId>
+ <artifactId>junit</artifactId>
+ <scope>test</scope>
+ </dependency>
+ <dependency>
+ <groupId>org.hamcrest</groupId>
+ <artifactId>hamcrest-core</artifactId>
+ <version>${hamcrest.version}</version>
+ </dependency>
+ <dependency>
+ <groupId>org.mockito</groupId>
+ <artifactId>mockito-all</artifactId>
+ <version>${mockito.version}</version>
+ <scope>test</scope>
+ </dependency>
+ </dependencies>
+</project>