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/*

  @test

  @bug 4386360

  @summary tests that DataFlavor.selectBestTextFlavor() returns null when passed

           is a null array or an empty array or an array which doesn't contain

           a text flavor in a supported encoding.

  @author das@sparc.spb.su area=datatransfer

  @run main SelectBestTextFlavorBadArrayTest

*/

import java.awt.datatransfer.DataFlavor;

import java.util.Stack;

import java.util.stream.Collectors;

public class SelectBestTextFlavorBadArrayTest {

    public static void main(String[] args) {

        final String[] failureMessages = {

            "DataFlavor.selectBestTextFlavor(null) doesn't return null.",

            "DataFlavor.selectBestTextFlavor() doesn't return null for an empty array.",

            "DataFlavor.selectBestTextFlavor() shouldn't return flavor in an unsupported encoding."

        };

        Stack<String> failures = new Stack<>();

        DataFlavor flavor = DataFlavor.selectBestTextFlavor(null);

        if (flavor != null) {

            failures.push(failureMessages[0]);

        }

        flavor = DataFlavor.selectBestTextFlavor(new DataFlavor[0]);

        if (flavor != null) {

            failures.push(failureMessages[1]);

        }

        try {

            flavor = DataFlavor.selectBestTextFlavor(new DataFlavor[]

                { new DataFlavor("text/plain; charset=unsupported; class=java.io.InputStream") });

        } catch (ClassNotFoundException e) {

            e.printStackTrace();

            failures.push("Exception thrown: " + e.toString());

        }

        if (flavor != null) {

            failures.push(failureMessages[2]);

        }

        if (failures.size() > 0) {

            String failureReport = failures.stream().collect(Collectors.joining("\n"));

            throw new RuntimeException("TEST FAILED: \n" + failureReport);

        }

    }

}