Name: dkR10031 Date: 03/25/2001


Specification of the method
javax.imageio.metadata.IIOMetadataFormatImpl.getChildNames says:

"If the element cannot have children, null is returned."

However, the implementation (JDK 1.4.0beta, build b56) of the method returns
String array of length 0 instead of null when the element is created with
a child policy CHILD_POLICY_EMPTY.


This bug causes failure of new JCK test:
api/javax_imageio/metadata/IIOMetadataFormatImpl#getChildNames

To reproduce the bug run the following test:

------------ test02.java ------------------------
import javax.imageio.metadata.IIOMetadataFormatImpl;
import javax.imageio.ImageTypeSpecifier;

public class test02 {

    public static void main(String argv[]) {

        MyFormatImpl fmt = new MyFormatImpl("root", 1, 10);
        fmt.addElement("cc", "root", fmt.CHILD_POLICY_EMPTY);

        String[] result = fmt.getChildNames("cc");

        if (result != null) {
            System.out.println("Faild, result is not null: " + result);
        } else {
            System.out.println("Passed");
        }
    }
}


class MyFormatImpl extends IIOMetadataFormatImpl {

    MyFormatImpl(String root, int minChildren, int maxChildren) {
        super(root, minChildren, maxChildren);
    }

    public void addElement(String elementName, String parentName, int childPolicy) {
        super.addElement(elementName, parentName, childPolicy);
    }

    public boolean canNodeAppear(String elementName, ImageTypeSpecifier imageType) {
        return true;
    }
}
------------ Logs -----------------------------
$ java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b56)
Java HotSpot(TM) Client VM (build 1.4-beta-B56, mixed mode)

$ javac test02.java

$ java test02
Faild, result is not null: [Ljava.lang.String;@14df86

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