Scala example source code file (xmlattr.scala)

This example Scala source code file (xmlattr.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

assert, assert, attributeoutput, attributewithoptiontest, none, none, null, null, some, test, testcase, testconsolemain, unprefixedattribute, unprefixedattribute

The Scala xmlattr.scala source code

import testing.SUnit.{Assert, TestCase, TestConsoleMain, TestSuite}
import xml.{NodeSeq, Null, Text, UnprefixedAttribute}

object Test extends TestConsoleMain {
  def suite = new TestSuite(UnprefixedAttributeTest, AttributeWithOptionTest)
  
  object UnprefixedAttributeTest extends TestCase("UnprefixedAttribute") with Assert {
    override def runTest {
      var x = new UnprefixedAttribute("foo","bar", Null)

      // always assertX(expected, actual)
      assertEquals(Some(Text("bar")), x.get("foo"));
      assertEquals(Text("bar"), x("foo"))
      assertEquals(None, x.get("no_foo"))
      assertEquals(null, x("no_foo"))
      
      val y = x.remove("foo")
      assertEquals(Null, y)

      val z = new UnprefixedAttribute("foo", null:NodeSeq, x)
      assertEquals(None, z.get("foo"))
      
      var appended = x append x append x append x
      var len = 0; while (appended ne Null) {
        appended = appended.next
        len = len + 1
      }
      assertEquals("removal of duplicates for unprefixed attributes in append", 1, len)
    }
  }

  object AttributeWithOptionTest extends TestCase("AttributeWithOption") with Assert {
    override def runTest {
      var x = new UnprefixedAttribute("foo", Some(Text("bar")), Null)

      assertEquals(Some(Text("bar")), x.get("foo"));
      assertEquals(Text("bar"), x("foo"))
      assertEquals(None, x.get("no_foo"))
      assertEquals(null, x("no_foo"))

      val attr1 = Some(Text("foo value"))
      val attr2 = None
      val y = <b foo={attr1} bar={attr2} />
      assertEquals(Some(Text("foo value")), y.attributes.get("foo"));
      assertEquals(Text("foo value"), y.attributes("foo"))
      assertEquals(None, y.attributes.get("bar"))
      assertEquals(null, y.attributes("bar"))

      val z = new UnprefixedAttribute("foo", None, x)
      assertEquals(None, z.get("foo")) // None
    }
  }

  object AttributeOutputTest extends TestCase("AttributeOutput") with Assert {
    override def runTest {
      assertEquals(<b x="&"/>.toString, "")
      assertEquals( <b x={"&"}/>.toString,  "")
    }
  }
}