{"action":"created","comment":{"url":"https://api.github.com/repos/SonarSource/sonarqube/pulls/comments/32238953","id":32238953,"diff_hunk":"@@ -0,0 +1,77 @@\n+/*\n+ * SonarQube, open source software quality management tool.\n+ * Copyright (C) 2008-2014 SonarSource\n+ * mailto:contact AT sonarsource DOT com\n+ *\n+ * SonarQube is free software; you can redistribute it and/or\n+ * modify it under the terms of the GNU Lesser General Public\n+ * License as published by the Free Software Foundation; either\n+ * version 3 of the License, or (at your option) any later version.\n+ *\n+ * SonarQube is distributed in the hope that it will be useful,\n+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\n+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n+ * Lesser General Public License for more details.\n+ *\n+ * You should have received a copy of the GNU Lesser General Public License\n+ * along with this program; if not, write to the Free Software Foundation,\n+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.\n+ */\n+\n+package org.sonar.server.computation.debt;\n+\n+import com.google.common.base.Preconditions;\n+import com.google.common.collect.ArrayListMultimap;\n+import com.google.common.collect.ImmutableList;\n+import com.google.common.collect.ImmutableSet;\n+import com.google.common.collect.Multimap;\n+import java.util.Collection;\n+import java.util.Collections;\n+import java.util.HashMap;\n+import java.util.List;\n+import java.util.Map;\n+\n+public class DebtModelHolderImpl implements MutableDebtModelHolder {\n+\n+  private Multimap<Characteristic, Characteristic> subCharacteristicsByRootCharacteristic = ArrayListMultimap.create();\n+  private Map<String, Characteristic> characteristicByKey = new HashMap<>();\n+\n+  @Override\n+  public void addCharacteristics(Characteristic rootCharacteristic, List<? extends Characteristic> subCharacteristics) {\n+    Preconditions.checkNotNull(rootCharacteristic, \"rootCharacteristic cannot be null\");","path":"server/sonar-server/src/main/java/org/sonar/server/computation/debt/DebtModelHolderImpl.java","position":41,"original_position":41,"commit_id":"3c813ab4743512714848b444098f0dd4e2024f83","original_commit_id":"3c813ab4743512714848b444098f0dd4e2024f83","user":{"login":"sns-seb","id":11717580,"avatar_url":"https://avatars.githubusercontent.com/u/11717580?v=3","gravatar_id":"","url":"https://api.github.com/users/sns-seb","html_url":"https://github.com/sns-seb","followers_url":"https://api.github.com/users/sns-seb/followers","following_url":"https://api.github.com/users/sns-seb/following{/other_user}","gists_url":"https://api.github.com/users/sns-seb/gists{/gist_id}","starred_url":"https://api.github.com/users/sns-seb/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sns-seb/subscriptions","organizations_url":"https://api.github.com/users/sns-seb/orgs","repos_url":"https://api.github.com/users/sns-seb/repos","events_url":"https://api.github.com/users/sns-seb/events{/privacy}","received_events_url":"https://api.github.com/users/sns-seb/received_events","type":"User","site_admin":false},"body":"use 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