int

init

Highspot Exercise.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module-library" exported="">
+      <library>
+        <CLASSES>
+          <root url="jar://$USER_HOME$/Downloads/jar_files/jackson-core-2.12.1.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
+    <orderEntry type="module-library" exported="">
+      <library>
+        <CLASSES>
+          <root url="jar://$USER_HOME$/Downloads/jar_files/jackson-databind-2.12.1.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
+    <orderEntry type="module-library" exported="">
+      <library>
+        <CLASSES>
+          <root url="jar://$USER_HOME$/Downloads/jar_files/jackson-annotations-2.12.1.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
+  </component>
+</module>

Readme

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+The program can be run using the following command on command line, changeFile is also json
+
+java com.company.highspot.ApplyChange pathOfMixtapeFile pathOfChangeFile pathOfOutputFile
+
+If both mixtape and changes files are large. We will store objectsd in mixtape files into database while reading the file, after complete storing mixtype file.
+We will read changes files in and apply changes to database, and output from database.

changes.json

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+{
+  "adds" : [
+    {
+      "id" : "4",
+      "user_id" : "2",
+      "song_ids" : [
+        "8",
+        "32"
+      ]
+    }
+  ],
+  "removes":["1"
+  ],
+  "addsongs": [
+    {
+      "song_id" : "1",
+      "playlist_id": "4"
+    }]
+}

mixtape-data.json

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+{
+  "users" : [
+    {
+      "id" : "1",
+      "name" : "Albin Jaye"
+    },
+    {
+      "id" : "2",
+      "name" : "Dipika Crescentia"
+    },
+    {
+      "id" : "3",
+      "name" : "Ankit Sacnite"
+    },
+    {
+      "id" : "4",
+      "name" : "Galenos Neville"
+    },
+    {
+      "id" : "5",
+      "name" : "Loviise Nagib"
+    },
+    {
+      "id" : "6",
+      "name" : "Ryo Daiki"
+    },
+    {
+      "id" : "7",
+      "name" : "Seyyit Nedim"
+    }
+  ],
+  "playlists" : [
+    {
+      "id" : "1",
+      "user_id" : "2",
+      "song_ids" : [
+        "8",
+        "32"
+      ]
+    },
+    {
+      "id" : "2",
+      "user_id" : "3",
+      "song_ids" : [
+        "6",
+        "8",
+        "11"
+      ]
+    },
+    {
+      "id" : "3",
+      "user_id" : "7",
+      "song_ids" : [
+        "7",
+        "12",
+        "13",
+        "16",
+        "2"
+      ]
+    }
+  ],
+  "songs": [
+    {
+      "id" : "1",
+      "artist": "Camila Cabello",
+      "title": "Never Be the Same"
+    },
+    {
+      "id" : "2",
+      "artist": "Zedd",
+      "title": "The Middle"
+    },
+    {
+      "id" : "3",
+      "artist": "The Weeknd",
+      "title": "Pray For Me"
+    },
+    {
+      "id" : "4",
+      "artist": "Drake",
+      "title": "God's Plan"
+    },
+    {
+      "id" : "5",
+      "artist": "Bebe Rexha",
+      "title": "Meant to Be"
+    },
+    {
+      "id" : "6",
+      "artist": "Imagine Dragons",
+      "title": "Whatever It Takes"
+    },
+    {
+      "id" : "7",
+      "artist": "Maroon 5",
+      "title": "Wait"
+    },
+    {
+      "id" : "8",
+      "artist": "Bazzi",
+      "title": "Mine"
+    },
+    {
+      "id" : "9",
+      "artist": "Marshmello",
+      "title": "FRIENDS"
+    },
+    {
+      "id" : "10",
+      "artist": "Dua Lipa",
+      "title": "New Rules"
+    },
+    {
+      "id" : "11",
+      "artist": "Shawn Mendes",
+      "title": "In My Blood"
+    },
+    {
+      "id" : "12",
+      "artist": "Post Malone",
+      "title": "Psycho"
+    },
+    {
+      "id" : "13",
+      "artist": "Ariana Grande",
+      "title": "No Tears Left To Cry"
+    },
+    {
+      "id" : "14",
+      "artist": "Bruno Mars",
+      "title": "Finesse"
+    },
+    {
+      "id" : "15",
+      "artist": "Kendrick Lamar",
+      "title": "All The Stars"
+    },
+    {
+      "id" : "16",
+      "artist": "G-Eazy",
+      "title": "Him & I"
+    },
+    {
+      "id" : "17",
+      "artist": "Lauv",
+      "title": "I Like Me Better"
+    },
+    {
+      "id" : "18",
+      "artist": "NF",
+      "title": "Let You Down"
+    },
+    {
+      "id" : "19",
+      "artist": "Dua Lipa",
+      "title": "IDGAF"
+    },
+    {
+      "id" : "20",
+      "artist": "Taylor Swift",
+      "title": "Delicate"
+    },
+    {
+      "id" : "21",
+      "artist": "Calvin Harris",
+      "title": "One Kiss"
+    },
+    {
+      "id" : "22",
+      "artist": "Ed Sheeran",
+      "title": "Perfect"
+    },
+    {
+      "id" : "23",
+      "artist": "Meghan Trainor",
+      "title": "No Excuses"
+    },
+    {
+      "id" : "24",
+      "artist": "Niall Horan",
+      "title": "On The Loose"
+    },
+    {
+      "id" : "25",
+      "artist": "Halsey",
+      "title": "Alone"
+    },
+    {
+      "id" : "26",
+      "artist": "Charlie Puth",
+      "title": "Done For Me"
+    },
+    {
+      "id" : "27",
+      "artist": "Foster The People",
+      "title": "Sit Next to Me"
+    },
+    {
+      "id" : "28",
+      "artist": "Max",
+      "title": "Lights Down Low"
+    },
+    {
+      "id" : "29",
+      "artist": "Alice Merton",
+      "title": "No Roots"
+    },
+    {
+      "id" : "30",
+      "artist": "5 Seconds Of Summer",
+      "title": "Want You Back"
+    },
+    {
+      "id" : "31",
+      "artist": "Camila Cabello",
+      "title": "Havana"
+    },
+    {
+      "id" : "32",
+      "artist": "Logic",
+      "title": "Everyday"
+    },
+    {
+      "id" : "33",
+      "artist": "Drake",
+      "title": "Nice For What"
+    },
+    {
+      "id" : "34",
+      "artist": "Halsey",
+      "title": "Bad At Love"
+    },
+    {
+      "id" : "35",
+      "artist": "ZAYN",
+      "title": "Let Me"
+    },
+    {
+      "id" : "36",
+      "artist": "Khalid",
+      "title": "Love Lies"
+    },
+    {
+      "id" : "37",
+      "artist": "Post Malone",
+      "title": "rockstar"
+    },
+    {
+      "id" : "38",
+      "artist": "Rudimental",
+      "title": "These Days"
+    },
+    {
+      "id" : "39",
+      "artist": "Liam Payne",
+      "title": "Familiar"
+    },
+    {
+      "id" : "40",
+      "artist": "Imagine Dragons",
+      "title": "Thunder"
+    }
+  ]
+}