xref: /external/apache-harmony/luni/src/test/api/common/org/apache/harmony/luni/tests/java/lang/reflect/MethodTest.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.harmony.luni.tests.java.lang.reflect;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class MethodTest extends junit.framework.TestCase {

	static class TestMethod {
		public TestMethod() {
		}

		public void voidMethod() throws IllegalArgumentException {
		}

		public void parmTest(int x, short y, String s, boolean bool, Object o,
				long l, byte b, char c, double d, float f) {
		}

		public int intMethod() {
			return 1;
		}

		public static final void printTest(int x, short y, String s,
				boolean bool, Object o, long l, byte b, char c, double d,
				float f) {
		}

		public double doubleMethod() {
			return 1.0;
		}

		public short shortMethod() {
			return (short) 1;
		}

		public byte byteMethod() {
			return (byte) 1;
		}

		public float floatMethod() {
			return 1.0f;
		}

		public long longMethod() {
			return 1l;
		}

		public char charMethod() {
			return 'T';
		}

		public Object objectMethod() {
			return new Object();
		}

		private static void prstatic() {
		}

		public static void pustatic() {
		}

		public static synchronized void pustatsynch() {
		}

		public static int invokeStaticTest() {
			return 1;
		}

		public int invokeInstanceTest() {
			return 1;
		}

		private int privateInvokeTest() {
			return 1;
		}

		public int invokeExceptionTest() throws NullPointerException {
			throw new NullPointerException();
		}

		public static synchronized native void pustatsynchnat();

		public void invokeCastTest1(byte param) {
		}

		public void invokeCastTest1(short param) {
		}

		public void invokeCastTest1(int param) {
		}

		public void invokeCastTest1(long param) {
		}

		public void invokeCastTest1(float param) {
		}

		public void invokeCastTest1(double param) {
		}

		public void invokeCastTest1(char param) {
		}

		public void invokeCastTest1(boolean param) {
		}
	}

	abstract class AbstractTestMethod {
		public abstract void puabs();
	}

	class TestMethodSub extends TestMethod {
		public int invokeInstanceTest() {
			return 0;
		}
	}

	/**
	 * @tests java.lang.reflect.Method#equals(java.lang.Object)
	 */
	public void test_equalsLjava_lang_Object() throws Exception {
		// Test for method boolean
		// java.lang.reflect.Method.equals(java.lang.Object)

		Method m1 = null, m2 = null;
		m1 = TestMethod.class.getMethod("invokeInstanceTest", new Class[0]);
		m2 = TestMethodSub.class.getMethod("invokeInstanceTest",
				new Class[0]);

		assertTrue("Overriden method returned equal", !m1.equals(m2));
		assertTrue("Same method returned not-equal", m1.equals(m1));
                m1 = TestMethod.class.getMethod("invokeStaticTest", new Class[0]);
                m2 = TestMethodSub.class
                                .getMethod("invokeStaticTest", new Class[0]);

                assertTrue("Inherited method returned not-equal", m1.equals(m2));
	}

	/**
	 * @tests java.lang.reflect.Method#getDeclaringClass()
	 */
	public void test_getDeclaringClass() {
		// Test for method java.lang.Class
		// java.lang.reflect.Method.getDeclaringClass()

		Method[] mths;

                mths = TestMethod.class.getDeclaredMethods();
                assertTrue("Returned incorrect declaring class: "
                                + mths[0].getDeclaringClass().toString(), mths[0]
                                .getDeclaringClass().equals(TestMethod.class));
	}

	/**
	 * @tests java.lang.reflect.Method#getExceptionTypes()
	 */
	public void test_getExceptionTypes() throws Exception {
		// Test for method java.lang.Class []
		// java.lang.reflect.Method.getExceptionTypes()

                Method mth = TestMethod.class.getMethod("voidMethod", new Class[0]);
                Class[] ex = mth.getExceptionTypes();
                assertEquals("Returned incorrect number of exceptions",
                                1, ex.length);
                assertTrue("Returned incorrect exception type", ex[0]
                                .equals(IllegalArgumentException.class));
                mth = TestMethod.class.getMethod("intMethod", new Class[0]);
                ex = mth.getExceptionTypes();
                assertEquals("Returned incorrect number of exceptions",
                                0, ex.length);
	}

	/**
	 * @tests java.lang.reflect.Method#getModifiers()
	 */
	public void test_getModifiers() throws Exception {
		// Test for method int java.lang.reflect.Method.getModifiers()

		Class cl = TestMethod.class;
		int mods = 0;
		Method mth = null;
		int mask = 0;
                mth = cl.getMethod("pustatic", new Class[0]);
                mods = mth.getModifiers();

                mask = Modifier.PUBLIC | Modifier.STATIC;
		assertTrue("Incorrect modifiers returned", (mods | mask) == mask);
                mth = cl.getDeclaredMethod("prstatic", new Class[0]);
                mods = mth.getModifiers();

                mask = Modifier.PRIVATE | Modifier.STATIC;
		assertTrue("Incorrect modifiers returned", (mods | mask) == mask);
		mth = cl.getDeclaredMethod("pustatsynch", new Class[0]);
		mods = mth.getModifiers();

                mask = (Modifier.PUBLIC | Modifier.STATIC) | Modifier.SYNCHRONIZED;
		assertTrue("Incorrect modifiers returned", (mods | mask) == mask);
		mth = cl.getDeclaredMethod("pustatsynchnat", new Class[0]);
		mods = mth.getModifiers();

                mask = ((Modifier.PUBLIC | Modifier.STATIC) | Modifier.SYNCHRONIZED)
				| Modifier.NATIVE;
		assertTrue("Incorrect modifiers returned", (mods | mask) == mask);
		cl = AbstractTestMethod.class;
                mth = cl.getDeclaredMethod("puabs", new Class[0]);
                mods = mth.getModifiers();

                mask = Modifier.PUBLIC | Modifier.ABSTRACT;
		assertTrue("Incorrect modifiers returned", (mods | mask) == mask);
	}

	/**
	 * @tests java.lang.reflect.Method#getName()
	 */
	public void test_getName() throws Exception {
		// Test for method java.lang.String java.lang.reflect.Method.getName()
		Method mth = null;
		mth = TestMethod.class.getMethod("voidMethod", new Class[0]);

                assertEquals("Returned incorrect method name",
				"voidMethod", mth.getName());
	}

	/**
	 * @tests java.lang.reflect.Method#getParameterTypes()
	 */
	public void test_getParameterTypes() throws Exception {
		// Test for method java.lang.Class []
		// java.lang.reflect.Method.getParameterTypes()
		Class cl = TestMethod.class;
		Method mth = null;
		Class[] parms = null;
		Method[] methods = null;
		Class[] plist = { int.class, short.class, String.class, boolean.class,
				Object.class, long.class, byte.class, char.class, double.class,
				float.class };
		mth = cl.getMethod("voidMethod", new Class[0]);
		parms = mth.getParameterTypes();

                assertEquals("Returned incorrect parameterTypes", 0, parms.length);
		mth = cl.getMethod("parmTest", plist);
		parms = mth.getParameterTypes();

                assertTrue("Invalid number of parameters returned",
				plist.length == parms.length);
		for (int i = 0; i < plist.length; i++)
			assertTrue("Incorrect parameter returned", plist[i]
					.equals(parms[i]));

		// Test same method. but this time pull it from the list of methods
		// rather than asking for it explicitly
		methods = cl.getDeclaredMethods();

		int i;
		for (i = 0; i < methods.length; i++)
			if (methods[i].getName().equals("parmTest")) {
				mth = methods[i];
				i = methods.length + 1;
			}
		if (i < methods.length) {
			parms = mth.getParameterTypes();
			assertTrue("Incorrect number of parameters returned",
					parms.length == plist.length);
			for (i = 0; i < plist.length; i++)
				assertTrue("Incorrect parameter returned", plist[i]
						.equals(parms[i]));
		}
	}

	/**
	 * @tests java.lang.reflect.Method#getReturnType()
	 */
	public void test_getReturnType() throws Exception {
		// Test for method java.lang.Class
		// java.lang.reflect.Method.getReturnType()
		Class cl = TestMethod.class;
		Method mth = null;
		mth = cl.getMethod("charMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted char", mth
				.getReturnType().equals(char.class));
		mth = cl.getMethod("longMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted long", mth
				.getReturnType().equals(long.class));
		mth = cl.getMethod("shortMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted short", mth
				.getReturnType().equals(short.class));
		mth = cl.getMethod("intMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted int: "
				+ mth.getReturnType(), mth.getReturnType().equals(int.class));
		mth = cl.getMethod("doubleMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted double", mth
				.getReturnType().equals(double.class));
		mth = cl.getMethod("byteMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted byte", mth
				.getReturnType().equals(byte.class));
		mth = cl.getMethod("byteMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted byte", mth
				.getReturnType().equals(byte.class));
		mth = cl.getMethod("objectMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted Object", mth
				.getReturnType().equals(Object.class));

		mth = cl.getMethod("voidMethod", new Class[0]);

                assertTrue("Gave incorrect returne type, wanted void", mth
				.getReturnType().equals(void.class));
	}

	/**
	 * @tests java.lang.reflect.Method#invoke(java.lang.Object,
	 *        java.lang.Object[])
	 */
	public void test_invokeLjava_lang_Object$Ljava_lang_Object() throws Exception {
		// Test for method java.lang.Object
		// java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object
		// [])

		Class cl = TestMethod.class;
		Method mth = null;
		Object ret = null;
		Class[] dcl = new Class[0];

		// Get and invoke a static method
		mth = cl.getDeclaredMethod("invokeStaticTest", dcl);
                ret = mth.invoke(null, new Object[0]);

                assertEquals("Invoke returned incorrect value", 1, ((Integer) ret)
				.intValue());

		// Get and invoke an instance method
		mth = cl.getDeclaredMethod("invokeInstanceTest", dcl);
                ret = mth.invoke(new TestMethod(), new Object[0]);

                assertEquals("Invoke returned incorrect value", 1, ((Integer) ret)
				.intValue());

		// Get and attempt to invoke a private method
		mth = cl.getDeclaredMethod("privateInvokeTest", dcl);

		try {
			ret = mth.invoke(new TestMethod(), new Object[0]);
		} catch (IllegalAccessException e) {
			// Correct behaviour
		}

		// Generate an IllegalArgumentException
		mth = cl.getDeclaredMethod("invokeInstanceTest", dcl);

                try {
			Object[] args = { Object.class };
			ret = mth.invoke(new TestMethod(), args);
		} catch (IllegalArgumentException e) {
			// Correct behaviour
		}

		// Generate a NullPointerException
		mth = cl.getDeclaredMethod("invokeInstanceTest", dcl);

                try {
			ret = mth.invoke(null, new Object[0]);
		} catch (NullPointerException e) {
			// Correct behaviour
		}

		// Generate an InvocationTargetException
		mth = cl.getDeclaredMethod("invokeExceptionTest", dcl);
		try {
			ret = mth.invoke(new TestMethod(), new Object[0]);
		} catch (InvocationTargetException e) {
			// Correct behaviour
		}

		mth = String.class.getMethod("valueOf", new Class[] { Integer.TYPE });
        try {
            mth.invoke(String.class, new Object[] { null });
            fail("should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // Expected
        }

		TestMethod testMethod = new TestMethod();
		Method methods[] = cl.getMethods();
		for (int i = 0; i < methods.length; i++) {
			if (methods[i].getName().startsWith("invokeCastTest1")) {
				Class param = methods[i].getParameterTypes()[0];

				try {
					methods[i].invoke(testMethod, new Object[] { new Byte(
							(byte) 1) });
					assertTrue("invalid invoke with Byte: " + methods[i],
							param == Byte.TYPE || param == Short.TYPE
									|| param == Integer.TYPE
									|| param == Long.TYPE
									|| param == Float.TYPE
									|| param == Double.TYPE);
				} catch (Exception e) {
					assertTrue("Byte invalid exception: " + e,
							e instanceof IllegalArgumentException);
					assertTrue("Byte invalid failure: " + methods[i],
							param == Boolean.TYPE || param == Character.TYPE);
				}

				try {
					methods[i].invoke(testMethod, new Object[] { new Short(
							(short) 1) });
					assertTrue("invalid invoke with Short: " + methods[i],
							param == Short.TYPE || param == Integer.TYPE
									|| param == Long.TYPE
									|| param == Float.TYPE
									|| param == Double.TYPE);
				} catch (Exception e) {
					assertTrue("Short invalid exception: " + e,
							e instanceof IllegalArgumentException);
					assertTrue("Short invalid failure: " + methods[i],
							param == Byte.TYPE || param == Boolean.TYPE
									|| param == Character.TYPE);
				}

				try {
					methods[i].invoke(testMethod,
							new Object[] { new Integer(1) });
					assertTrue("invalid invoke with Integer: " + methods[i],
							param == Integer.TYPE || param == Long.TYPE
									|| param == Float.TYPE
									|| param == Double.TYPE);
				} catch (Exception e) {
					assertTrue("Integer invalid exception: " + e,
							e instanceof IllegalArgumentException);
					assertTrue("Integer invalid failure: " + methods[i],
							param == Byte.TYPE || param == Short.TYPE
									|| param == Boolean.TYPE
									|| param == Character.TYPE);
				}

				try {
					methods[i].invoke(testMethod, new Object[] { new Long(1) });
					assertTrue("invalid invoke with Long: " + methods[i],
							param == Long.TYPE || param == Float.TYPE
									|| param == Double.TYPE);
				} catch (Exception e) {
					assertTrue("Long invalid exception: " + e,
							e instanceof IllegalArgumentException);
					assertTrue("Long invalid failure: " + methods[i],
							param == Byte.TYPE || param == Short.TYPE
									|| param == Integer.TYPE
									|| param == Boolean.TYPE
									|| param == Character.TYPE);
				}

				try {
					methods[i].invoke(testMethod, new Object[] { new Character(
							'a') });
					assertTrue("invalid invoke with Character: " + methods[i],
							param == Character.TYPE || param == Integer.TYPE
									|| param == Long.TYPE
									|| param == Float.TYPE
									|| param == Double.TYPE);
				} catch (Exception e) {
					assertTrue("Character invalid exception: " + e,
							e instanceof IllegalArgumentException);
					assertTrue("Character invalid failure: " + methods[i],
							param == Byte.TYPE || param == Short.TYPE
									|| param == Boolean.TYPE);
				}

				try {
					methods[i]
							.invoke(testMethod, new Object[] { new Float(1) });
					assertTrue("invalid invoke with Float: " + methods[i],
							param == Float.TYPE || param == Double.TYPE);
				} catch (Exception e) {
					assertTrue("Float invalid exception: " + e,
							e instanceof IllegalArgumentException);
					assertTrue("Float invalid failure: " + methods[i],
							param == Byte.TYPE || param == Short.TYPE
									|| param == Integer.TYPE
									|| param == Long.TYPE
									|| param == Boolean.TYPE
									|| param == Character.TYPE);
				}

				try {
					methods[i].invoke(testMethod,
							new Object[] { new Double(1) });
					assertTrue("invalid invoke with Double: " + methods[i],
							param == Double.TYPE);
				} catch (Exception e) {
					assertTrue("Double invalid exception: " + e,
							e instanceof IllegalArgumentException);
					assertTrue("Double invalid failure: " + methods[i],
							param == Byte.TYPE || param == Short.TYPE
									|| param == Integer.TYPE
									|| param == Long.TYPE
									|| param == Boolean.TYPE
									|| param == Character.TYPE
									|| param == Float.TYPE);
				}

				try {
					methods[i].invoke(testMethod, new Object[] { new Boolean(
							true) });
					assertTrue("invalid invoke with Boolean: " + methods[i],
							param == Boolean.TYPE);
				} catch (Exception e) {
					assertTrue("Boolean invalid exception: " + e,
							e instanceof IllegalArgumentException);
					assertTrue("Boolean invalid failure: " + methods[i],
							param == Byte.TYPE || param == Short.TYPE
									|| param == Integer.TYPE
									|| param == Long.TYPE
									|| param == Character.TYPE
									|| param == Float.TYPE
									|| param == Double.TYPE);
				}
			}
		}
	}

	public void test_invoke_InvocationTargetException() throws Exception {
        Method method = MockObject.class.getDeclaredMethod("mockMethod", Class.class);
        MockObject mockObject = new MockObject();

        try {
            method.invoke(mockObject, InvocationTargetException.class);
            fail("should throw InvocationTargetException");
        } catch (InvocationTargetException e) {
            // Expected
        }

        try {
            method.invoke(mockObject, IllegalAccessException.class);
            fail("should throw InvocationTargetException");
        } catch (InvocationTargetException e) {
            // Expected
        }

        try {
            method.invoke(mockObject, IllegalArgumentException.class);
            fail("should throw InvocationTargetException");
        } catch (InvocationTargetException e) {
            // Expected
        }

        try {
            method.invoke(mockObject, InvocationTargetException.class);
            fail("should throw InvocationTargetException");
        } catch (InvocationTargetException e) {
            // Expected
        }

        try {
            method.invoke(mockObject, Throwable.class);
            fail("should throw InvocationTargetException");
        } catch (InvocationTargetException e) {
            // Expected
        }
    }

    static class MockObject {

        public void mockMethod (Class<?> clazz) throws Exception {
            if (clazz == InstantiationException.class) {
                throw new InstantiationException();
            } else if (clazz == IllegalAccessException.class) {
                throw new IllegalAccessException();
            } else if (clazz == IllegalArgumentException.class) {
                throw new IllegalArgumentException();
            } else if (clazz == InvocationTargetException.class) {
                throw new InvocationTargetException(new Throwable());
            } else {
                throw new Exception();
            }
        }
    }

	/**
	 * @tests java.lang.reflect.Method#toString()
	 */
	public void test_toString() throws Exception {
        Method mth = null;
        Class[] parms = { int.class, short.class, String.class, boolean.class,
                Object.class, long.class, byte.class, char.class, double.class,
                float.class };
        mth = TestMethod.class.getDeclaredMethod("printTest", parms);

        assertTrue(
                "Returned incorrect string for method: " + mth.toString(),
                mth
                        .toString()
                        .equals(
                                "public static final void org.apache.harmony.luni.tests.java.lang.reflect.MethodTest$TestMethod.printTest(int,short,java.lang.String,boolean,java.lang.Object,long,byte,char,double,float)"));
    }
}