info.archinnov.achilles.internal.reflection.ReflectionInvoker Maven / Gradle / Ivy

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CQL implementation for Achilles using Datastax Java driver
There is a newer version: 6.1.0
/*
 * Copyright (C) 2012-2014 DuyHai DOAN
 *
 *  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 info.archinnov.achilles.internal.reflection;

import info.archinnov.achilles.exception.AchillesException;
import info.archinnov.achilles.internal.metadata.holder.PropertyMeta;
import info.archinnov.achilles.internal.validation.Validator;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ReflectionInvoker {
	private static final Logger log = LoggerFactory.getLogger(ReflectionInvoker.class);

    private FieldAccessor accessor = FieldAccessor.Singleton.INSTANCE.get();
    private ObjectInstantiator instantiator = ObjectInstantiator.Singleton.INSTANCE.get();

	public Object getPrimaryKey(Object entity, PropertyMeta idMeta) {

		final Field field = idMeta.getField();
        if(log.isTraceEnabled()) {
            log.trace("Get primary key {} from instance {} of class {}", idMeta.getPropertyName(), entity, field
                    .getDeclaringClass().getCanonicalName());
        }
		if (entity != null) {
			try {
				return accessor.getValueFromField(field, entity);
			} catch (IllegalAccessException | IllegalArgumentException e) {
				throw new AchillesException("Cannot get primary key from field '" + field.getName() + "' of type '"
						+ field.getDeclaringClass().getCanonicalName() + "' from entity '" + entity + "'", e);
			}
		}
		return null;
	}

	public  T getValueFromField(Object target, Field field) {
        if(log.isTraceEnabled()) {
            log.trace("Get value from field {} from instance {} of class {}", field.getName(), target, field
                    .getDeclaringClass().getCanonicalName());
        }
		T value = null;

		if (target != null) {
			try {
				value = accessor.getValueFromField(field, target);
			} catch (IllegalAccessException | IllegalArgumentException e) {
				throw new AchillesException("Cannot get value from field '" + field.getName() + "' of type '"
						+ field.getDeclaringClass().getCanonicalName() + "' on instance '" + target + "'", e);
			}
		}
		log.trace("Found value : {}", value);
		return value;
	}

	public Object getValueFromField(Object target, Method getter) {
        if(log.isTraceEnabled()) {
            log.trace("Get value with getter {} from instance {} of class {}", getter.getName(), target, getter
                    .getDeclaringClass().getCanonicalName());
        }
		Object value = null;

		if (target != null) {
			try {
				value = getter.invoke(target);
			} catch (Exception e) {
				throw new AchillesException("Cannot invoke '" + getter.getName() + "' of type '"
						+ getter.getDeclaringClass().getCanonicalName() + "' on instance '" + target + "'", e);
			}
		}

		log.trace("Found value : {}", value);
		return value;
	}

	public  List getListValueFromField(Object target, Field field) {
		return getValueFromField(target, field);
	}

	public  Set getSetValueFromField(Object target, Field field) {
		return getValueFromField(target, field);
	}

	public  Map getMapValueFromField(Object target, Field field) {
		return getValueFromField(target, field);
	}

	public void setValueToField(Object target, Field field, Object args) {
        if(log.isTraceEnabled()) {
            log.trace("Set value to field {} from instance {} of class {} with {}", field.getName(), target, field
                    .getDeclaringClass().getCanonicalName(), args);
        }

		final Class type = field.getType();
		if (type.isPrimitive()) {
			Validator.validateNotNull(args,
					"Cannot set null value to primitive type '%s' of field '%s' on instance of class'%s'",
					type.getCanonicalName(), field.getName(), field.getDeclaringClass().getCanonicalName());
		}
		if (target != null) {
			try {
				accessor.setValueToField(field, target, args);
			} catch (IllegalAccessException | IllegalArgumentException e) {
				throw new AchillesException("Cannot set value to field '" + field.getName() + "' of type '"
						+ field.getType().getCanonicalName() + "' on instance '" + target + "'", e);
			}
		}
	}

	public  T instantiate(Class entityClass) {
        if(log.isTraceEnabled()) {
            log.trace("Instantiate entity class {}", entityClass);
        }
		return instantiator.instantiate(entityClass);
	}

    public static enum Singleton {
        INSTANCE;

        private final ReflectionInvoker instance = new ReflectionInvoker();

        public ReflectionInvoker get() {
            return instance;
        }
    }
}