com.link_intersystems.lang.reflect.MethodInvokingTransformerTest.java Source code

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Here is the source code for com.link_intersystems.lang.reflect.MethodInvokingTransformerTest.java

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/**
 * Copyright 2011 Link Intersystems GmbH <rene.link@link-intersystems.com>
 *
 * Licensed 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 com.link_intersystems.lang.reflect;

import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNotNull;
import static junit.framework.Assert.assertTrue;
import static org.easymock.EasyMock.createNiceMock;
import static org.easymock.EasyMock.expect;
import static org.easymock.EasyMock.replay;

import java.io.IOException;
import java.lang.reflect.Method;

import org.apache.commons.collections4.Transformer;
import org.apache.commons.lang3.reflect.MethodUtils;
import org.junit.Before;
import org.junit.Test;

public class MethodInvokingTransformerTest {

    private InvocationArgumentsResolver argumentResolver;
    private Method charAtMethod;

    @Before
    public void setup() {
        argumentResolver = new InvocationArgumentsResolver() {

            public Object[] getArguments(Object invokedObject, Method invokedMethod) {
                return new Object[] { 1 };
            }
        };
        charAtMethod = MethodUtils.getAccessibleMethod(String.class, "charAt", Integer.TYPE);
    }

    @Test(expected = IllegalArgumentException.class)
    public void transformWrongType() {
        Transformer transformer = new MethodInvokingTransformer(charAtMethod, argumentResolver);
        Character valueOf = Character.valueOf('c');
        transformer.transform(valueOf);
    }

    @Test(expected = NullPointerException.class)
    public void transformNullValue() {
        Transformer transformer = new MethodInvokingTransformer(charAtMethod, argumentResolver);
        transformer.transform(null);
    }

    @Test(expected = IllegalArgumentException.class)
    public void wrongArguments() {
        Transformer transformer = new MethodInvokingTransformer(charAtMethod, new InvocationArgumentsResolver() {

            public Object[] getArguments(Object invokedObject, Method invokedMethod) {
                return new Object[] { "A" };
            }
        });
        transformer.transform("Test");
    }

    @Test(expected = IllegalArgumentException.class)
    public void nullTypeConstructor() {
        new MethodInvokingTransformer((Method2) null, argumentResolver);
    }

    @Test(expected = IllegalArgumentException.class)
    public void nullArgumentResolverConstructor() {
        new MethodInvokingTransformer(charAtMethod, null);
    }

    @Test
    public void invokeMethod() {
        String testString = "HelloWorld";

        Transformer transformer = new MethodInvokingTransformer(charAtMethod, argumentResolver);
        Object transform = transformer.transform(testString);
        assertNotNull(transform);
        assertTrue(transform instanceof Character);
        Character charAt1 = (Character) transform;
        assertEquals('e', charAt1.charValue());
    }

    @Test(expected = NullPointerException.class)
    public void invokeInstanceMethodOnNull() {
        Transformer transformer = new MethodInvokingTransformer(charAtMethod, argumentResolver);
        transformer.transform(null);
    }

    @Test
    public void invokeMethodWithNoArguments() {
        String testString = "HelloWorld";
        Method toStringMethod = MethodUtils.getAccessibleMethod(String.class, "toString", new Class<?>[0]);
        Transformer transformer = new MethodInvokingTransformer(toStringMethod);
        Object transform = transformer.transform(testString);
        assertNotNull(transform);
        assertTrue(transform instanceof String);
        String string = (String) transform;
        assertEquals("HelloWorld", string);
    }

    @Test(expected = IllegalStateException.class)
    public void invokeInstanceMethodThrowsUnknownException() {
        String testString = "HelloWorld";
        Method toStringMethod = MethodUtils.getAccessibleMethod(String.class, "toString", new Class<?>[0]);
        Transformer transformer = new MethodInvokingTransformer(toStringMethod) {

            @Override
            protected Object invokeInstanceMethod(Object targetObject) throws Exception {
                throw new IOException();
            }

        };
        transformer.transform(testString);
    }

    @Test
    public void invokeStaticMethodWithNullTarget() throws SecurityException, NoSuchMethodException {
        InvocationArgumentsResolver invocationArgumentsResolver = createNiceMock(InvocationArgumentsResolver.class);
        Method formatMethod = String.class.getDeclaredMethod("format", String.class, Object[].class);
        expect(invocationArgumentsResolver.getArguments(String.class, formatMethod))
                .andReturn(new Object[] { "Hello %s", "World" });
        replay(invocationArgumentsResolver);

        Transformer transformer = new MethodInvokingTransformer(formatMethod, invocationArgumentsResolver);
        Object transform = transformer.transform(null);
        assertNotNull(transform);
        assertEquals("Hello World", transform);
    }

    @Test
    public void invokeStaticMethodWithClassTarget() throws SecurityException, NoSuchMethodException {
        InvocationArgumentsResolver invocationArgumentsResolver = createNiceMock(InvocationArgumentsResolver.class);
        Method formatMethod = String.class.getDeclaredMethod("format", String.class, Object[].class);
        expect(invocationArgumentsResolver.getArguments(String.class, formatMethod))
                .andReturn(new Object[] { "Hello %s", "World" });
        replay(invocationArgumentsResolver);

        Transformer transformer = new MethodInvokingTransformer(formatMethod, invocationArgumentsResolver);
        Object transform = transformer.transform(String.class);
        assertNotNull(transform);
        assertEquals("Hello World", transform);
    }

}