ArrayReplicator.java

/*
 * Copyright 2007 The Apache Software Foundation.
 *
 * 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 net.sf.beanlib.provider.replicator;

import static net.sf.beanlib.utils.ClassUtils.immutable;

import java.lang.reflect.Array;

import net.jcip.annotations.ThreadSafe;
import net.sf.beanlib.spi.BeanTransformerSpi;
import net.sf.beanlib.spi.CustomBeanTransformerSpi;
import net.sf.beanlib.spi.replicator.ArrayReplicatorSpi;

/**
 * Default implementation of {@link net.sf.beanlib.spi.replicator.ArrayReplicatorSpi}.
 * 
 * @author Joe D. Velopar
 */
public class ArrayReplicator extends ReplicatorTemplate implements ArrayReplicatorSpi {
    private static final Factory factory = new Factory();

    /**
     * Factory for {@link ArrayReplicator}
     * 
     * @author Joe D. Velopar
     */
    @ThreadSafe
    private static class Factory implements ArrayReplicatorSpi.Factory {
        private Factory() {}

        @Override
        public ArrayReplicator newArrayReplicatable(BeanTransformerSpi beanTransformer) {
            return new ArrayReplicator(beanTransformer);
        }
    }

    public static ArrayReplicator newArrayReplicatable(BeanTransformerSpi beanTransformer) {
        return factory.newArrayReplicatable(beanTransformer);
    }

    protected ArrayReplicator(BeanTransformerSpi beanTransformer) {
        super(beanTransformer);
    }

    @Override
    public <T> T replicateArray(Object arrayToCopy, Class<T> toClass) {
        if (!toClass.isAssignableFrom(arrayToCopy.getClass()))
            return null;
        Class<?> fromClass = arrayToCopy.getClass();
        Class<?> fromComponentType = fromClass.getComponentType();
        // primitive array
        if (immutable(fromComponentType)) {
            int len = Array.getLength(arrayToCopy);
            Object to = Array.newInstance(fromComponentType, len);
            System.arraycopy(arrayToCopy, 0, to, 0, len);
            putTargetCloned(arrayToCopy, to);
            return toClass.cast(to);
        }
        // non-primitive array
        final int len = Array.getLength(arrayToCopy);
        final Object to = Array.newInstance(fromComponentType, len);
        putTargetCloned(arrayToCopy, to);
        final Object[] fromArray = (Object[]) arrayToCopy;
        final Object[] toArray = (Object[]) to;
        final CustomBeanTransformerSpi customTransformer = getCustomerBeanTransformer();
        // recursively populate member objects.
        for (int i = fromArray.length - 1; i >= 0; i--) {
            final Object fromElement = fromArray[i];

            if (fromElement == null)
                continue;

            if (super.containsTargetCloned(fromElement)) {
                toArray[i] = super.getTargetCloned(fromElement);
                continue;
            }

            if (customTransformer != null) {
                final Class<?> fromElementClass = fromElement.getClass();

                if (customTransformer.isTransformable(fromElement, fromElementClass, null)) {
                    final Object toElement = customTransformer.transform(fromElement, fromElementClass, null);
                    super.putTargetCloned(fromElement, toElement);
                    toArray[i] = toElement;
                    continue;
                }
            }
            final Object toElement = replicate(fromElement);
            // cloned target is already placed in the target cloned map in replicate
            toArray[i] = toElement;
        }
        return toClass.cast(toArray);
    }
}