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Scala example source code file (xmlstuff.scala)

This example Scala source code file (xmlstuff.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

acme, cdata, cdata, elm, hello, io, letter, letter, list, nodeseq, nodeseq, sax, test, text, text, this

The Scala xmlstuff.scala source code

import java.io.StringReader
import org.xml.sax.InputSource

import scala.testing.SUnit.Assert
import scala.xml.{Node, NodeSeq, Elem, Text, XML}

object Test extends AnyRef with Assert {

  /** returns true if exception was thrown */
  def catcher(att: Function1[Unit, scala.xml.MetaData]): Boolean = {
    var ex = false
    try {
      att.apply({})
    } catch {
      case scala.xml.MalformedAttributeException(msg) =>
        println(msg)
        ex = true
    }
    ex
  }

  def main(args: Array[String]) {

  //val e:  scala.xml.MetaData         = null; //Node.NoAttributes;
  //val sc: scala.xml.NamespaceBinding = null;

    // ------------------------------------------ tests for class NodeSeq

    /**
    println("checking wellformed attributes");
    {
    import scala.xml.{ UnprefixedAttribute, Null }
    assertTrue(catcher {x:Unit => new UnprefixedAttribute("key", "<", Null)});   // < illegal
    assertTrue(catcher(x:Unit => new UnprefixedAttribute("key", "&", Null)));   // & illegal
    assertTrue(catcher(x:Unit => new UnprefixedAttribute("key", "a&a", Null))); // & illegal
    assertTrue(catcher(x:Unit => new UnprefixedAttribute("key", "a&a;&", Null))); // 2nd &

    assertFalse(catcher(x:Unit => new UnprefixedAttribute("key", "a&a; <<", Null)));
    }
*/

/*
checking wellformed attributes
< not allowed in attribute value
passed ok
malformed entity reference in attribute value [&]
passed ok
malformed entity reference in attribute value [a&a]
passed ok
malformed entity reference in attribute value [a&a;&]
passed ok
passed ok
*/

  println("NodeSeq")

    val p = <foo>
              <bar gt='ga' value="3"/>
              <baz bazValue="8"/>
              <bar value="5" gi='go'/>
            </foo>;
  
    val pelems_1 = for( val x <- p \ "bar"; val y <- p \ "baz" ) yield {
      Text(x.attributes("value").toString + y.attributes("bazValue").toString+ "!")
    };
    val pelems_2 = new NodeSeq { val theSeq = List(Text("38!"),Text("58!")) };
    assertSameElementsXML(pelems_1, pelems_2)

    assertEqualsXML(p \\ "@bazValue", Text("8"))

    val books = 
    <bks>
      <book>Blabla
      <book>Blubabla
      <book>Baaaaaaalabla
    </bks>;

  val reviews = 
    <reviews>
      <entry>Blabla
      <remarks>
        Hallo Welt.
      </remarks>
    </entry>
      <entry>Blubabla
      <remarks>
        Hello Blu
      </remarks>
  </entry>
      <entry>Blubabla
      <remarks>
        rem 2
      </remarks>
  </entry>
    </reviews>;

  println( new scala.xml.PrettyPrinter(80, 5).formatNodes (
    for (t <- books \\ "title";
         r <- reviews \\ "entry"
         if (r \ "title") xml_== t) yield
          <result>
    { t }
    { r \ "remarks" }
    </result>
  ));

  // example
  println( 
    for (t @ <book>Blabla <- new NodeSeq { val theSeq = books.child }.toList)
    yield t
  );
val phoneBook =  
  <phonebook>
      <descr>
        This is the <b>phonebook of the 
        <a href="http://acme.org">ACME corporation.
      </descr>
      <entry>
        <name>John 
        <phone where="work">  +41 21 693 68 67
        <phone where="mobile">+41 79 602 23 23
      </entry>
    </phonebook>;


val addrBook =  
  <addrbook>
      <descr>
        This is the <b>addressbook of the 
        <a href="http://acme.org">ACME corporation.
      </descr>
      <entry>
        <name>John 
        <street> Elm Street
        <city>Dolphin City
      </entry>
    </addrbook>;

  println( new scala.xml.PrettyPrinter(80, 5).formatNodes (
    for (t <- addrBook \\ "entry";
         r <- phoneBook \\ "entry"
         if (t \ "name") xml_== (r \ "name")) yield
          <result>
    { t.child }
    { r \ "phone" }
    </result>
  ));

  
  /* namespaces */
   // begin tmp
  println("namespaces")
  val cuckoo = <cuckoo xmlns="http://cuckoo.com">
    <foo/>
    <bar/>
  </cuckoo>;
  assertEquals(cuckoo.namespace, "http://cuckoo.com")
  for (n <- cuckoo \ "_" ) {
    //println("n = "+n);
    //println("n.prefix = "+n.prefix);
    //.println("n.scope = "+n.scope);
    assertEquals( n.namespace, "http://cuckoo.com")
  }

  println("validation - elements")
  val vtor = new scala.xml.dtd.ElementValidator();
  {
    import scala.xml.dtd.ELEMENTS
    import scala.xml.dtd.ContentModel._
    vtor.setContentModel(
	  ELEMENTS( 
	    Sequ(
		  Letter(ElemName("bar")), 
		  Star(Letter(ElemName("baz"))) )));

  }
  assertEquals(vtor( <foo> ), true);
  {
    import scala.xml.dtd.MIXED
    import scala.xml.dtd.ContentModel._
    
    vtor.setContentModel(
      MIXED(
        Alt(Letter(ElemName("bar")), 
            Letter(ElemName("baz")), 
            Letter(ElemName("bal")))));
  }

  assertEquals(vtor(<foo> ), true)
  assertEquals(vtor(<foo>abcdedgh ), true)
  assertEquals(vtor(<foo>    ), false)

  println("validation - attributes")
  vtor.setContentModel(null)
  vtor.setMetaData(List())
  assertEquals(vtor( <foo bar="hello"/> ), false)
  
  { 
    import scala.xml.dtd._ 
    vtor setMetaData List(AttrDecl("bar", "CDATA", IMPLIED))
  }
  assertEquals(vtor(<foo href="http://foo.com" bar="hello"/>), false)
  assertEquals(vtor(<foo bar="hello"/>), true)

  { 
    import scala.xml.dtd._
    vtor.setMetaData(List(AttrDecl("bar","CDATA",REQUIRED)))
  }
  assertEquals( vtor( <foo href="http://foo.com" /> ), false )
  assertEquals( vtor( <foo bar="http://foo.com" /> ), true )
  
  }
}

Other Scala examples (source code examples)

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