JLambdaMethodRefTest.java

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 * Portions Copyright 2013-2017 Philip Helger + contributors
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 * may not use this file except in compliance with the License.  You can
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 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package com.helger.jcodemodel;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

import com.helger.jcodemodel.util.CodeModelTestsHelper;

/**
 * Test class for class {@link JLambdaMethodRef}.
 *
 * @author Philip Helger
 */
public final class JLambdaMethodRefTest
{
  @Test
  public void testStaticMethodRef_Name ()
  {
    final JCodeModel cm = new JCodeModel ();

    final JLambdaMethodRef aLambda = cm.ref (Object.class).methodRef ("toString");
    assertEquals ("java.lang.Object::toString", CodeModelTestsHelper.toString (aLambda));
    assertTrue (aLambda.isStaticRef ());
    assertNull (aLambda.method ());
    assertSame (cm.ref (Object.class), aLambda.type ());
    assertNull (aLambda.var ());
    assertEquals ("toString", aLambda.methodName ());
  }

  @Test
  public void testStaticMethodRef_JMethod () throws JClassAlreadyExistsException
  {
    final JCodeModel cm = new JCodeModel ();
    final JDefinedClass cl = cm._class ("com.helger.test.LambdaTest");
    final JMethod m = cl.method (JMod.PUBLIC | JMod.STATIC, cm.ref (String.class), "myToString");
    final JVar p = m.param (Object.class, "obj");
    m.body ()._return (cm.ref (String.class).staticInvoke ("valueOf").arg (p));

    final JLambdaMethodRef aLambda = new JLambdaMethodRef (m);
    assertEquals ("com.helger.test.LambdaTest::myToString", CodeModelTestsHelper.toString (aLambda));
    assertTrue (aLambda.isStaticRef ());
    assertSame (m, aLambda.method ());
    assertSame (cl, aLambda.type ());
    assertNull (aLambda.var ());
    assertEquals ("myToString", aLambda.methodName ());

    // Modify original method
    m.name ("newName");
    assertEquals ("com.helger.test.LambdaTest::newName", CodeModelTestsHelper.toString (aLambda));
    assertTrue (aLambda.isStaticRef ());
    assertSame (m, aLambda.method ());
    assertSame (cl, aLambda.type ());
    assertNull (aLambda.var ());
    assertEquals ("newName", aLambda.methodName ());
  }

  @Test
  public void testStaticMethodRef_New () throws JClassAlreadyExistsException
  {
    final JCodeModel cm = new JCodeModel ();
    final JDefinedClass cl = cm._class ("com.helger.test.LambdaTest");

    final JLambdaMethodRef aLambda = new JLambdaMethodRef (cl);
    assertEquals ("com.helger.test.LambdaTest::new", CodeModelTestsHelper.toString (aLambda));
    assertTrue (aLambda.isStaticRef ());
    assertNull (aLambda.method ());
    assertSame (cl, aLambda.type ());
    assertNull (aLambda.var ());
    assertEquals ("new", aLambda.methodName ());
  }

  @Test
  public void testInstanceMethodRef_Name ()
  {
    final JCodeModel cm = new JCodeModel ();
    final JBlock aBlock = new JBlock ();
    final JVar aVar = aBlock.decl (cm._ref (Object.class), "aObj");

    final JLambdaMethodRef aLambda = new JLambdaMethodRef (aVar, "toString");
    assertEquals ("aObj::toString", CodeModelTestsHelper.toString (aLambda));
    assertFalse (aLambda.isStaticRef ());
    assertNull (aLambda.method ());
    assertSame (cm._ref (Object.class), aLambda.type ());
    assertSame (aVar, aLambda.var ());
    assertEquals ("toString", aLambda.methodName ());
  }

  @Test
  public void testInstanceMethodRef_JMethod () throws JClassAlreadyExistsException
  {
    final JCodeModel cm = new JCodeModel ();
    final JDefinedClass cl = cm._class ("com.helger.test.LambdaTest");
    final JMethod m = cl.method (JMod.PUBLIC, cm.ref (String.class), "myToString");
    final JVar p = m.param (Object.class, "obj");
    m.body ()._return (cm.ref (String.class).staticInvoke ("valueOf").arg (p));

    final JBlock aBlock = new JBlock ();
    final JVar aVar = aBlock.decl (cl, "aObj");

    final JLambdaMethodRef aLambda = new JLambdaMethodRef (aVar, m);
    assertEquals ("aObj::myToString", CodeModelTestsHelper.toString (aLambda));
    assertFalse (aLambda.isStaticRef ());
    assertSame (m, aLambda.method ());
    assertSame (cl, aLambda.type ());
    assertSame (aVar, aLambda.var ());
    assertEquals ("myToString", aLambda.methodName ());
  }
}