move to upper level.

Author: chlin501

lca/LICENSE

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+

lca/README.md

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+### Introduction
+
+  The lowest common ancestors example.
+
+### Prerequisite 
+
+  * java version 8
+  * scala version 2.11.7
+  * sbt version 0.13.9

lca/build.sbt

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+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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
+ *
+ *     http://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.
+ */
+name := "lca"
+
+organization := "lca"
+
+version := "0.1"
+
+scalaVersion := "2.11.7"
+
+resolvers ++= Seq (
+  "Apache repo" at "https://repository.apache.org/content/repositories/releases"
+)
+
+libraryDependencies ++= Seq (
+  "org.scalatest" %% "scalatest" % "2.2.4" % "test"
+)

lca/src/main/scala/lca/LCA.scala

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+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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
+ *
+ *     http://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.
+ */
+package lca
+
+import scala.collection.JavaConversions._
+
+object LCA {
+
+  case class Node(id: String) {
+    var children = List.empty[Node]
+    override def toString(): String = "Node("+id+","+children+")"
+  } 
+
+  def data1(): Node = {
+    val a = Node("A")
+    val b = Node("B")
+    val c = Node("C")
+    val d = Node("D")
+    val e = Node("E")
+    val f = Node("F")
+    val g = Node("G")
+    val h = Node("H")
+    val i = Node("I")
+    val j = Node("J")
+    val k = Node("K")
+    val l = Node("L")
+    a.children = List(b, c, d) 
+    b.children = List(e, f)
+    c.children = List(g)
+    d.children = List(h)
+    e.children = List(j, k)
+    f.children = List(l)
+    a
+  }
+
+  def data(): Node = {
+    val a = Node("A")
+    val b = Node("B")
+    val c = Node("C")
+    val d = Node("D")
+    a.children = List(b, c)
+    c.children = List(d) 
+    a
+  }
+
+  def search(node: Node, collector: java.util.Map[String, Seq[String]]) {
+    collector.get(node.id) match {
+      case null => throw new RuntimeException("No path found for id "+node.id)
+      case route: Seq[String] => {
+        if(!node.children.isEmpty) collector.remove(node.id)
+        node.children.foreach { child => 
+          collector.put(child.id, (route ++ Seq(child.id)))
+          search(child, collector)
+        }
+      }
+    } 
+  }
+
+  def lca(routes: java.util.Map[String, Seq[String]], 
+          targetA: String, targetB: String): String = {
+    val found = routes.filter { case (k, v) => 
+      v.contains(targetA) || v.contains(targetB) 
+    }.values.toList
+    if(1 == found.size) {
+      val idxA = found(0).indexOf(targetA)
+      val idxB = found(0).indexOf(targetB)
+      if(idxA < idxB) targetA else targetB
+    } else if(1 < found.size){
+      found.foldLeft(found(0)){ (r, e) => r.intersect(e) }.last
+    } else ""
+  }
+  
+  def main(args: Array[String]) {
+    val root = data1()
+    val collector = new java.util.HashMap[String, Seq[String]]
+    collector.put(root.id, Seq(root.id))
+    search(root, collector)
+    println("collector: "+collector)
+    val common = lca(collector, "K", "L")
+    println("least common element found: "+common)
+  }
+  
+}

lca/src/test/scala/lca/LCASpec.scala

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+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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
+ *
+ *     http://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.
+ */
+package lca
+
+import org.scalatest.FlatSpec
+import org.scalatest.Matchers
+
+class LCASpec extends FlatSpec with Matchers {
+  
+}