src/jsr311-api/test/javax/ws/rs/core/GenericEntityTest.java

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package javax.ws.rs.core;

import java.lang.reflect.GenericArrayType;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import junit.framework.TestCase;

public class GenericEntityTest extends TestCase {
    
    public GenericEntityTest(String testName) {
        super(testName);
    }            

    public void testListOfString() {
        System.out.println("testListOfString");
        List<String> list = new ArrayList<String>();
        GenericEntity<List<String>> listOfString = new GenericEntity<List<String>>(list) {};
        Class<?> rawType = listOfString.getRawType();
        assertEquals(rawType, ArrayList.class);
        Type type = listOfString.getType();
        assertTrue(type instanceof ParameterizedType);
        ParameterizedType pType = (ParameterizedType)type;
        Type typeArgs[] = pType.getActualTypeArguments();
        assertEquals(1, typeArgs.length);
        assertTrue(typeArgs[0] instanceof Class<?>);
        Class<?> typeArgType = (Class<?>)typeArgs[0];
        assertEquals(typeArgType, String.class);
    }

    public void testMapOfStringInteger() {
        System.out.println("testMapOfStringInteger");
        Map<String,Integer> map = new HashMap<String,Integer>();
        GenericEntity<Map<String,Integer>> mapOfString = new GenericEntity<Map<String,Integer>>(map) {};
        Class<?> rawType = mapOfString.getRawType();
        assertEquals(rawType, HashMap.class);
        Type type = mapOfString.getType();
        assertTrue(type instanceof ParameterizedType);
        ParameterizedType pType = (ParameterizedType)type;
        Type typeArgs[] = pType.getActualTypeArguments();
        assertEquals(2, typeArgs.length);
        assertTrue(typeArgs[0] instanceof Class<?>);
        Class<?> typeArgType = (Class<?>)typeArgs[0];
        assertEquals(typeArgType, String.class);
        assertTrue(typeArgs[1] instanceof Class<?>);
        typeArgType = (Class<?>)typeArgs[1];
        assertEquals(typeArgType, Integer.class);
    }

    @SuppressWarnings("unchecked")
    public void testArrayOfListOfString() {
        System.out.println("testArrayOfListOfString");
        List<String> array[] = new List[1];
        GenericEntity<List<String>[]> arrayOfListOfString = new GenericEntity<List<String>[]>(array) {};
        Class<?> rawType = arrayOfListOfString.getRawType();
        assertTrue(rawType.isArray());
        Type type = arrayOfListOfString.getType();
        assertTrue(type instanceof GenericArrayType);
        type = ((GenericArrayType)type).getGenericComponentType();
        assertTrue(type instanceof ParameterizedType);
        ParameterizedType pType = (ParameterizedType)type;
        Type typeArgs[] = pType.getActualTypeArguments();
        assertEquals(1, typeArgs.length);
        assertTrue(typeArgs[0] instanceof Class<?>);
        Class<?> typeArgType = (Class<?>)typeArgs[0];
        assertEquals(typeArgType, String.class);
    }
    
    public void testNumber() {
        System.out.println("testNumber");
        Number n = new Integer(0);
        GenericEntity<Number> number = new GenericEntity<Number>(n) {};
        Class<?> rawType = number.getRawType();
        assertEquals(rawType, Integer.class);
        Type type = number.getType();
        assertTrue(type instanceof Class);
        Class<?> genericType = (Class<?>)type;
        assertEquals(genericType, Number.class);
    }

    @SuppressWarnings("unchecked")
    public void testCtor() {
        System.out.println("testCtor");
        try {
            // check GenericEntity(Integer, Number) works
            Method getNumber = this.getClass().getDeclaredMethod("getNumber");
            Type rt = getNumber.getGenericReturnType();
            GenericEntity ge = new GenericEntity(1, rt);
            // check GenericEntity(String, Number) fails
            try {
                ge = new GenericEntity("foo",rt);
                fail("Expected IllegalArgumentException");
            } catch (IllegalArgumentException e) {
            }
            // check GenericEntity(Integer[], Number[]) works
            Method getNumbers = this.getClass().getDeclaredMethod("getNumbers");
            rt = getNumbers.getGenericReturnType();
            Integer ints[] = {1,2};
            ge = new GenericEntity(ints, rt);
            // check GenericEntity(String[], Number[]) fails
            try {
                String strings[] = {"foo","bar"};
                ge = new GenericEntity(strings,rt);
                fail("Expected IllegalArgumentException");
            } catch (IllegalArgumentException e) {
            }
            // check GenericEntity(ArrayList<String>, List<String>) works
            Method getList = this.getClass().getDeclaredMethod("getList");
            rt = getList.getGenericReturnType();
            ArrayList<String> als = new ArrayList<String>();
            ge = new GenericEntity(als, rt);
            // check GenericEntity(ArrayList<Integer>, List<String>) works
            // note that erasure loses the generic type of the ArrayList
            ArrayList<Integer> ali = new ArrayList<Integer>();
            ge = new GenericEntity(ali, rt);
            // check GenericEntity(Set<String>, List<String>) fails
            try {
                Set<String> ss = new HashSet<String>();
                ge = new GenericEntity(ss, rt);
                fail("Expected IllegalArgumentException");
            } catch (IllegalArgumentException e) {
            }
            // check GenericEntity(ArrayList<String>[], List<String>[]) works
            Method getLists = this.getClass().getDeclaredMethod("getLists");
            rt = getLists.getGenericReturnType();
            ArrayList<String>[] lists = new ArrayList[1];
            ge = new GenericEntity(lists, rt);
            // check GenericEntity(ArrayList<Integer>[], List<String>[]) works
            // note that erasure loses the generic type of the ArrayList
            ArrayList<Integer>[] ilists = new ArrayList[1];
            ge = new GenericEntity(ilists, rt);
            // check GenericEntity(Set<String>[], List<String>[]) fails
            try {
                Set<String>[] ss = new Set[1];
                ge = new GenericEntity(ss, rt);
                fail("Expected IllegalArgumentException");
            } catch (IllegalArgumentException e) {
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail("Unhandled Exception");
        }
    }
    
    private Number getNumber() {return null;}
    private Number[] getNumbers() {return null;}
    private List<String> getList() {return null;}
    private List<String>[] getLists() {return null;}
}