Added java version of the excersise

.gitignore

@@ -1,2 +1,4 @@
 **/.idea
 *.iml
+**/build
+**/.gradle

java/README.md

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+# Video store kata
+
+Based on the book 'Refactoring' by Martin Fowler. More information on this book can be found on https://martinfowler.com/books/refactoring.html
+
+Imagine a company of theatrical players who go out to various events performing plays. Typically, a customer will request a few plays and the company charges 
+them based on the size of the audience and the kind of play they perform. There are currently two kinds of plays that the company performs: tragedies and comedies. As well as providing a bill for the performance, the company gives its customers “volume credits” which they can use for discounts on future performances—think of it as a customer loyalty mechanism.
+
+Plays.json
+```json
+{
+  "hamlet": {"name": "Hamlet", "type": "tragedy"},
+  "as-like": {"name": "As You Like It", "type": "comedy"},
+  "othello": {"name": "Othello", "type": "tragedy"}
+}
+```
+
+Invoices.json
+```json
+[
+  {
+    "customer": "BigCo",
+    "performances": [
+      {
+        "playID": "hamlet",
+        "audience": 55
+      },
+      {
+        "playID": "as-like",
+        "audience": 35
+      },
+      {
+        "playID": "othello",
+        "audience": 40
+      }
+    ]
+  }
+]
+```

java/build.gradle

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+apply plugin: 'java'
+
+group 'kata'
+version '1.0-SNAPSHOT'
+sourceCompatibility = 12
+
+repositories {
+    mavenCentral()
+}
+
+test {
+    useJUnitPlatform()
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+}
+
+dependencies {
+    testCompile 'org.junit.jupiter:junit-jupiter:5.5.1'
+    testCompile 'org.assertj:assertj-core:3.13.2'
+}

java/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

java/gradlew

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+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

java/gradlew.bat

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+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

java/settings.gradle

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+rootProject.name = 'theatrical-plays'
+

java/src/main/java/Invoice.java

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+import javax.swing.*;
+import java.util.List;
+
+public class Invoice {
+
+    public String customer;
+    public List<Performance> performances;
+
+    public Invoice(String customer, List<Performance> performances) {
+        this.customer = customer;
+        this.performances = performances;
+    }
+}

java/src/main/java/Performance.java

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+public class Performance {
+
+    public String playID;
+    public int audience;
+
+    public Performance(String playID, int audience) {
+        this.playID = playID;
+        this.audience = audience;
+    }
+}

java/src/main/java/Play.java

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+public class Play {
+
+    public String name;
+    public String type;
+
+    public Play(String name, String type) {
+        this.name = name;
+        this.type = type;
+    }
+}

java/src/main/java/StatementPrinter.java

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+import java.text.NumberFormat;
+import java.util.Locale;
+import java.util.Map;
+
+public class StatementPrinter {
+
+    public String print(Invoice invoice, Map<String, Play> plays) {
+        var totalAmount = 0;
+        var volumeCredits = 0;
+        var result = String.format("Statement for %s\n", invoice.customer);
+
+        NumberFormat frmt = NumberFormat.getCurrencyInstance(Locale.US);
+
+        for (var perf : invoice.performances) {
+            var play = plays.get(perf.playID);
+            var thisAmount = 0;
+
+            switch (play.type) {
+                case "tragedy":
+                    thisAmount = 40000;
+                    if (perf.audience > 30) {
+                        thisAmount += 1000 * (perf.audience - 30);
+                    }
+                    break;
+                case "comedy":
+                    thisAmount = 30000;
+                    if (perf.audience > 20) {
+                        thisAmount += 10000 + 500 * (perf.audience - 20);
+                    }
+                    thisAmount += 300 * perf.audience;
+                    break;
+                default:
+                    throw new Error("unknown type: ${play.type}");
+            }
+
+            // add volume credits
+            volumeCredits += Math.max(perf.audience - 30, 0);
+            // add extra credit for every ten comedy attendees
+            if ("comedy" == play.type) volumeCredits += Math.floor(perf.audience / 5);
+
+            // print line for this order
+            result += String.format("  %s: %s (%s seats)\n", play.name, frmt.format(thisAmount / 100), perf.audience);
+            totalAmount += thisAmount;
+        }
+        result += String.format("Amount owed is %s\n", frmt.format(totalAmount / 100));
+        result += String.format("You earned %s credits\n", volumeCredits);
+        return result;
+    }
+
+}

java/src/test/java/StatementPrinterTests.java

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+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class StatementPrinterTests {
+
+    @Test
+    void printsStatements() {
+        Map<String, Play> plays = Map.of("hamlet", new Play("Hamlet", "tragedy"),
+                "as-like", new Play("As You Like It", "comedy"),
+                "othello", new Play("Othello", "tragedy"));
+
+        Invoice invoice = new Invoice("BigCo", List.of(new Performance("hamlet", 55),
+                new Performance("as-like", 35),
+                new Performance("othello", 40)));
+
+        StatementPrinter statementPrinter = new StatementPrinter();
+        var result = statementPrinter.print(invoice, plays);
+
+        assertThat(result).isEqualTo("Statement for BigCo\n" +
+                "  Hamlet: $650.00 (55 seats)\n" +
+                "  As You Like It: $580.00 (35 seats)\n" +
+                "  Othello: $500.00 (40 seats)\n" +
+                "Amount owed is $1,730.00\n" +
+                "You earned 47 credits\n");
+    }
+}