    1   /***
    2    * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
    3    */
    4   package test.net.sourceforge.pmd.rules;
    5
    6   import net.sourceforge.pmd.PMD;
    7   import net.sourceforge.pmd.Report;
    8   import net.sourceforge.pmd.Rule;
    9   import net.sourceforge.pmd.RuleSetNotFoundException;
    10  import test.net.sourceforge.pmd.testframework.SimpleAggregatorTst;
    11  import test.net.sourceforge.pmd.testframework.TestDescriptor;
    12
    13  public class DoubleCheckedLockingTest extends SimpleAggregatorTst {
    14
    15      private Rule rule;
    16
    17      public void setUp() throws RuleSetNotFoundException {
    18          rule = findRule("basic", "DoubleCheckedLocking");
    19      }
    20
    21      public void testAll() {
    22          runTests(new TestDescriptor[]{
    23              new TestDescriptor(TEST1, "simple ok", 0, rule),
    24              new TestDescriptor(TEST2, "simple failure", 1, rule),
    25              new TestDescriptor(TEST3, "skip interfaces", 0, rule),
    26          });
    27      }
    28
    29      public void testGenerics() throws Throwable {
    30          Report rpt = new Report();
    31          runTestFromString15(TEST4, rule, rpt);
    32          assertEquals(0, rpt.size());
    33      }
    34
    35      private static final String TEST1 =
    36              "public class Foo {" + PMD.EOL +
    37              " public void foo() {}" + PMD.EOL +
    38              "}";
    39
    40      private static final String TEST2 =
    41              "public class Foo {" + PMD.EOL +
    42              "      Object baz;" + PMD.EOL +
    43              "      Object bar() {" + PMD.EOL +
    44              "        if(baz == null) { //baz may be non-null yet not fully created" + PMD.EOL +
    45              "          synchronized(this){" + PMD.EOL +
    46              "            if(baz == null){" + PMD.EOL +
    47              "              baz = new Object();" + PMD.EOL +
    48              "            }" + PMD.EOL +
    49              "          }" + PMD.EOL +
    50              "        }" + PMD.EOL +
    51              "        return baz;" + PMD.EOL +
    52              "      }" + PMD.EOL +
    53              "}";
    54
    55      private static final String TEST3 =
    56              "public interface Foo {" + PMD.EOL +
    57              " void foo();" + PMD.EOL +
    58              "}";
    59
    60      private static final String TEST4 =
    61              "public class Foo {" + PMD.EOL +
    62              " public <T> Bar<T> foo() { /* blah */}" + PMD.EOL +
    63              "}";
    64  }