org.gerzog.spock.injectmock.internal.accessors.MethodAccessor.java Source code

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Here is the source code for org.gerzog.spock.injectmock.internal.accessors.MethodAccessor.java

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/**
 * Copyright 2015 Nikolay Lagutko <nikolay.lagutko@mail.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 org.gerzog.spock.injectmock.internal.accessors;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.stream.Stream;

import org.apache.commons.lang3.StringUtils;
import org.spockframework.runtime.InvalidSpecException;

/**
 * @author Nikolay Lagutko (nikolay.lagutko@mail.com)
 *
 */
public class MethodAccessor extends AbstractSingleTypeAccessor {

    private static final String SETTER_PREFIX = "set";

    @Override
    public boolean exists(final Class<?> clazz, final String name, final Class<?> type) {
        return getDeclaredMethod(clazz, type, toMethodName(name)) != null;
    }

    @Override
    protected void internalSet(final Object target, final String name, final Object value) {
        final String methodName = toMethodName(name);
        final Method method = getDeclaredMethod(target.getClass(), value.getClass(), methodName);

        if (method != null) {
            final boolean original = method.isAccessible();
            try {
                method.setAccessible(true);
                method.invoke(target, value);
            } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                throw new InvalidSpecException("Cannot write injectable value to method <"
                        + target.getClass().getSimpleName() + "." + methodName + ">", e);
            } finally {
                method.setAccessible(original);
            }
        }
    }

    private static String toMethodName(final String propertyName) {
        return SETTER_PREFIX + StringUtils.capitalize(propertyName);
    }

    private static Method getDeclaredMethod(final Class<?> clazz, final Class<?> type, final String name) {
        Method result = null;

        if (type != null) {
            try {
                result = clazz.getDeclaredMethod(name, type);
            } catch (NoSuchMethodException e) {
                result = null;
            }

            if (result == null) {
                result = Stream.of(clazz.getDeclaredMethods()).filter(method -> {
                    return (method.getName().equals(name)) && (method.getParameterCount() == 1)
                            && (method.getParameterTypes()[0].isAssignableFrom(type));
                }).findFirst().orElse(null);
            }

            if ((result == null) && (clazz.getSuperclass() != null)) {
                result = getDeclaredMethod(clazz.getSuperclass(), type, name);
            }
        }

        return result;
    }
}