diff --git a/build.gradle b/build.gradle new file mode 100644 index 0000000..bdcd461 --- /dev/null +++ b/build.gradle @@ -0,0 +1,19 @@ +plugins { + id 'java' +} + +group 'org.example' +version '1.0-SNAPSHOT' + +repositories { + mavenCentral() +} + +dependencies { + testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2' + testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2' +} + +test { + useJUnitPlatform() +} \ No newline at end of file diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..7454180 Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..00e33ed --- /dev/null +++ b/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,5 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.1-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/gradlew b/gradlew new file mode 100755 index 0000000..744e882 --- /dev/null +++ b/gradlew @@ -0,0 +1,185 @@ +#!/usr/bin/env sh + +# +# Copyright 2015 the original author or authors. +# +# 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 +# +# https://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. +# + +############################################################################## +## +## 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 "$0"` + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD="maximum" + +warn () { + echo "$*" +} + +die () { + echo + echo "$*" + echo + exit 1 +} + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "`uname`" in + CYGWIN* ) + cygwin=true + ;; + Darwin* ) + darwin=true + ;; + MSYS* | MINGW* ) + msys=true + ;; + NONSTOP* ) + nonstop=true + ;; +esac + +CLASSPATH=$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 or MSYS, switch paths to Windows format before running java +if [ "$cygwin" = "true" -o "$msys" = "true" ] ; 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=`expr $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" + +exec "$JAVACMD" "$@" diff --git a/gradlew.bat b/gradlew.bat new file mode 100644 index 0000000..107acd3 --- /dev/null +++ b/gradlew.bat @@ -0,0 +1,89 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@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 Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@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" "-Xms64m" + +@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 execute + +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 execute + +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 + +: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 %* + +: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 diff --git a/pom.xml b/pom.xml deleted file mode 100644 index 29ae17c..0000000 --- a/pom.xml +++ /dev/null @@ -1,39 +0,0 @@ - - - 4.0.0 - - ru.spbstu.insys - programming-lab-example - 1.0-SNAPSHOT - - - 11 - 5.8.2 - ${jvm.version} - ${jvm.version} - UTF-8 - - - - - org.junit.jupiter - junit-jupiter - ${junit.jupiter.version} - test - - - - - - - maven-surefire-plugin - 2.22.2 - - - maven-failsafe-plugin - 2.22.2 - - - - \ No newline at end of file diff --git a/src/main/java/Trie/Node.java b/src/main/java/Trie/Node.java new file mode 100644 index 0000000..9b80dcb --- /dev/null +++ b/src/main/java/Trie/Node.java @@ -0,0 +1,25 @@ +package Trie; + +import java.util.ArrayList; +import java.util.List; + +class Node { + char value; + boolean isLastSymbol; + List children; + + Node(char value) { + this.value = value; + this.isLastSymbol = false; + this.children = new ArrayList<>(); + } + + Node getChild(char symbol) { + for (Node current : children) { + if (current.value == symbol) { + return current; + } + } + return null; + } +} \ No newline at end of file diff --git a/src/main/java/Trie/Trie.java b/src/main/java/Trie/Trie.java new file mode 100644 index 0000000..0d900d1 --- /dev/null +++ b/src/main/java/Trie/Trie.java @@ -0,0 +1,110 @@ + +//Префиксное дерево (Trie) +//Хранит строки в виде префиксного дерева. Корневой узел такого дерева не хранит +//ничего, узлы 1-го уровня хранят первый символ строки, 2-го уровня -- второй символ и +//так далее. +//Методы: добавление строки в дерево, удаление строки из дерева, поиск строки в +//дереве, поиск всех строк в дереве с заданным префиксом. + +package Trie; + +import java.util.*; + +public class Trie { + final Node root = new Node(' '); + + private void RecursiveAdd(String input, Node node) { + if (input == null || node == null) return; + if (input.isEmpty()) { + node.isLastSymbol = true; + return; + } + char symbol = input.charAt(0); + Node child = node.getChild(symbol); + if (child == null) { + child = new Node(symbol); + node.children.add(child); + } + RecursiveAdd(input.substring(1), child); + } + + public void add(String str) { + if (str == null || containsString(str) || str.isEmpty()) return; + RecursiveAdd(str.toLowerCase(), root); + } + + private void RecursiveRemove(String input, Node node) { + if (input == null || node == null) return; + if (input.isEmpty()) { + node.isLastSymbol = false; + return; + } + char symbol = input.charAt(0); + Node child = node.getChild(symbol); + RecursiveRemove(input.substring(1), child); + if (child.children.isEmpty() && !child.isLastSymbol) { + node.children.remove(child); + } + } + + public void remove(String str) { + if (containsString(str)) { + RecursiveRemove(str.toLowerCase(), root); + } + } + + public boolean containsString(String str) { + Node current = lastCharNode(str); + if (current == null) return false; + return current.isLastSymbol; + } + + private ArrayList RecursiveGetAllByPrefix(String prefix, Node node) { + ArrayList storage = new ArrayList<>(); + if (prefix == null || node == null) return storage; + ArrayList tempResult = new ArrayList<>(); + prefix += node.value; + if (!node.children.isEmpty()) { + for (Node child : node.children) { + tempResult.addAll(RecursiveGetAllByPrefix(prefix, child)); + } + if (node.isLastSymbol) tempResult.add(prefix.trim()); + return tempResult; + } + tempResult.add(prefix.trim()); + return tempResult; + } + + public ArrayList getAllByPrefix(String prefix) { + Node current = lastCharNode(prefix); + if (current == null) { + return new ArrayList<>(); + } + prefix = prefix.toLowerCase(); + if (current.children.isEmpty()) { + ArrayList storage = new ArrayList<>(); + storage.add(prefix); + return storage; + } + prefix = prefix.substring(0, prefix.length()-1); + ArrayList result = RecursiveGetAllByPrefix(prefix, current); + result.sort(Comparator.comparingInt(String::length)); + return result; + } + + public ArrayList getAll() { + ArrayList result = RecursiveGetAllByPrefix("", root); + result.remove(""); + return result; + } + + Node lastCharNode(String str) { + if (str == null || str.isEmpty()) return null; + Node current = root; + for (char c : str.toLowerCase().toCharArray()) { + current = current.getChild(c); + if (current == null) return null; + } + return current; + } +} \ No newline at end of file diff --git a/src/test/java/Trie/NodeTest.java b/src/test/java/Trie/NodeTest.java new file mode 100644 index 0000000..4c50cee --- /dev/null +++ b/src/test/java/Trie/NodeTest.java @@ -0,0 +1,20 @@ +package Trie; + +import static org.junit.jupiter.api.Assertions.*; +import org.junit.jupiter.api.Test; + +class NodeTest { + Trie testTrie; + + @Test + void testGetChild() { + testTrie = new Trie(); + testTrie.add("abc"); + + Node lastCharNode = testTrie.lastCharNode("abc"); + Node penultimateCharNode = testTrie.lastCharNode("ab"); + assertNull(lastCharNode.getChild('d')); + assertEquals('c', penultimateCharNode.getChild('c').value); + assertNull(penultimateCharNode.getChild('q')); + } +} \ No newline at end of file diff --git a/src/test/java/Trie/TrieTest.java b/src/test/java/Trie/TrieTest.java new file mode 100644 index 0000000..001be5d --- /dev/null +++ b/src/test/java/Trie/TrieTest.java @@ -0,0 +1,97 @@ +package Trie; + +import static org.junit.jupiter.api.Assertions.*; +import java.util.*; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.Test; + +public class TrieTest { + + Trie testTrie; + Trie testTrieExtra; + List expectedStrings; + + + @BeforeEach + void setUp() { + testTrie = new Trie(); + expectedStrings = new ArrayList<>(); + } + @Test + void testAdd() { + expectedStrings.add("dragonfly"); + expectedStrings.add("dragon"); + testTrie.add("Dragon"); + testTrie.add("Dragonfly"); + testTrie.add("DRAGON"); + testTrie.add("DRAGONFLY"); + testTrie.add(null); + testTrie.add(""); + + assertEquals(expectedStrings, testTrie.getAll()); + } + + @Test + void testRemove() { + expectedStrings.add("hedgehog"); + expectedStrings.add("squirrel"); + testTrie.add("Deer"); + testTrie.add("Hedgehog"); + testTrie.add("Squirrel"); + + testTrie.remove("Deer"); + testTrie.remove(null); + testTrie.remove(""); + assertEquals(testTrie.getAll(),expectedStrings); + } + + @Test + void testContainsString() { + testTrie.add("Crow"); + testTrie.add("Sparrow"); + + assertTrue(testTrie.containsString("Crow")); + assertFalse(testTrie.containsString("Eagle")); + assertFalse(testTrie.containsString(null)); + assertFalse(testTrie.containsString("")); + } + + @Test + void testGetAllByPrefix() { + ArrayList expectedStringsExtra = new ArrayList<>(); + expectedStringsExtra.add("wild cat"); + expectedStrings.add("wild cat"); + expectedStrings.add("wild boar"); + testTrie.add("Wild boar"); + testTrie.add("Wild cat"); + testTrie.add("Hamster"); + + assertEquals(expectedStrings, testTrie.getAllByPrefix("wild")); + assertTrue(testTrie.getAllByPrefix(null).isEmpty()); + assertTrue(testTrie.getAllByPrefix("").isEmpty()); + assertEquals(testTrie.getAllByPrefix("Wild cat"), expectedStringsExtra); + } + + @Test + void testGetAll() { + expectedStrings.add("kangaroo"); + expectedStrings.add("koala"); + expectedStrings.add("tasmanian devil"); + for (String str : expectedStrings) testTrie.add(str); + testTrieExtra = new Trie(); + testTrieExtra.add(null); + testTrieExtra.add(""); + + assertEquals(expectedStrings, testTrie.getAll()); + assertTrue(testTrieExtra.getAll().isEmpty()); + } + + @Test + void testLastCharNode() { + testTrie.add("Gorilla"); + assertNull(testTrie.lastCharNode("Chimpanzee")); + assertEquals('a', testTrie.lastCharNode("Gorilla").value); + assertNull(testTrie.lastCharNode("")); + assertNull(testTrie.lastCharNode(null)); + } +}