fix build compatibility with Java 1.5

sonar-check-api/src/main/java/org/sonar/check/Cardinality.java

+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.check;
+
+/**
+ * @since 2.3
+ */
+public enum Cardinality {
+  SINGLE, MULTIPLE
+}

sonar-check-api/src/main/java/org/sonar/check/Rule.java

    */
   IsoCategory isoCategory();
 
-  CARDINALITY cardinality() default CARDINALITY.SINGLE;
-
-  public static enum CARDINALITY {
-    SINGLE, MULTIPLE
-  }
-}
+  Cardinality cardinality() default Cardinality.SINGLE;
+}

sonar-plugin-api/src/main/java/org/sonar/api/rules/Rule.java

 import org.apache.commons.lang.builder.HashCodeBuilder;
 import org.apache.commons.lang.builder.ToStringBuilder;
 import org.sonar.api.database.DatabaseProperties;
+import org.sonar.check.Cardinality;
 
 import javax.persistence.*;
 import java.util.ArrayList;
 
   @Enumerated(EnumType.STRING)
   @Column(name = "cardinality", updatable = true, nullable = false)
-  private org.sonar.check.Rule.CARDINALITY cardinality = org.sonar.check.Rule.CARDINALITY.SINGLE;
+  private Cardinality cardinality = Cardinality.SINGLE;
 
   @ManyToOne(fetch = FetchType.EAGER)
   @JoinColumn(name = "parent_id", updatable = true, nullable = true)
     return setRepositoryKey(repositoryKey).setKey(key).setConfigKey(key);
   }
 
-  public org.sonar.check.Rule.CARDINALITY getCardinality() {
+  public Cardinality getCardinality() {
     return cardinality;
   }
 
-  public Rule setCardinality(org.sonar.check.Rule.CARDINALITY c) {
+  public Rule setCardinality(Cardinality c) {
     this.cardinality = c;
     return this;
   }

sonar-plugin-api/src/main/java/org/sonar/api/rules/XMLRuleParser.java

         rule.setRulesCategory(new RulesCategory(category));
 
       } else if (StringUtils.equalsIgnoreCase("cardinality", nodeName)) {
-        rule.setCardinality(org.sonar.check.Rule.CARDINALITY.valueOf(StringUtils.trim(cursor.collectDescendantText(false))));
+        rule.setCardinality(org.sonar.check.Cardinality.valueOf(StringUtils.trim(cursor.collectDescendantText(false))));
 
       } else if (StringUtils.equalsIgnoreCase("param", nodeName)) {
         processParameter(rule, cursor);

sonar-plugin-api/src/test/java/org/sonar/api/rules/XMLRuleParserTest.java

 import org.hamcrest.core.Is;
 import org.junit.Test;
 import org.sonar.api.utils.SonarException;
+import org.sonar.check.Cardinality;
 
 import java.io.StringReader;
 import java.util.List;
     assertThat(rule.getName(), is("Local Variable Name"));
     assertThat(rule.getDescription(), is("Checks that local, non-final variable names conform to a format specified by the format property."));
     assertThat(rule.getPriority(), Is.is(RulePriority.BLOCKER));
-    assertThat(rule.getCardinality(), Is.is(org.sonar.check.Rule.CARDINALITY.MULTIPLE));
+    assertThat(rule.getCardinality(), Is.is(Cardinality.MULTIPLE));
     assertThat(rule.getConfigKey(), is("Checker/TreeWalker/LocalVariableName"));
 
     assertThat(rule.getParams().size(), is(2));