DynamoDBHashAndRangeKeyExtractingEntityMetadataImpl.java

/*
 * Copyright 2013 the original author or authors.
 *
 * 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.socialsignin.spring.data.dynamodb.repository.support;

import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Set;

import org.springframework.data.annotation.Id;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.ReflectionUtils.FieldCallback;
import org.springframework.util.ReflectionUtils.MethodCallback;

import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBHashKey;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBIndexRangeKey;

/**
 * @author Michael Lavelle
 */
public class DynamoDBHashAndRangeKeyExtractingEntityMetadataImpl<T, ID extends Serializable> extends
		DynamoDBEntityMetadataSupport<T, ID> implements DynamoDBHashAndRangeKeyExtractingEntityMetadata<T, ID> {

	private DynamoDBHashAndRangeKeyMethodExtractor<T> hashAndRangeKeyMethodExtractor;

	private Method hashKeySetterMethod;
	private Field hashKeyField;

	public DynamoDBHashAndRangeKeyExtractingEntityMetadataImpl(final Class<T> domainType) {
		super(domainType);
		this.hashAndRangeKeyMethodExtractor = new DynamoDBHashAndRangeKeyMethodExtractorImpl<T>(getJavaType());
		ReflectionUtils.doWithMethods(domainType, new MethodCallback() {
			public void doWith(Method method) {
				if (method.getAnnotation(DynamoDBHashKey.class) != null) {
					String setterMethodName = toSetterMethodNameFromAccessorMethod(method);
					if (setterMethodName != null) {
						hashKeySetterMethod = ReflectionUtils.findMethod(domainType, setterMethodName, method.getReturnType());
					}
				}
			}
		});
		ReflectionUtils.doWithFields(domainType, new FieldCallback() {
			public void doWith(Field field) {
				if (field.getAnnotation(DynamoDBHashKey.class) != null) {
					
					hashKeyField = ReflectionUtils.findField(domainType, field.getName());
					
				}
			}
		});
		Assert.isTrue(hashKeySetterMethod != null || hashKeyField != null, "Unable to find hash key field or setter method on " + domainType + "!");
		Assert.isTrue(hashKeySetterMethod == null || hashKeyField == null, "Found both hash key field and setter method on " + domainType + "!");

	}

	@Override
	public <H> HashAndRangeKeyExtractor<ID, H> getHashAndRangeKeyExtractor(Class<ID> idClass) {
		return new CompositeIdHashAndRangeKeyExtractor<ID, H>(idClass);
	}

	@Override
	public String getRangeKeyPropertyName() {
		return getPropertyNameForAccessorMethod(hashAndRangeKeyMethodExtractor.getRangeKeyMethod());
	}

	@Override
	public Set<String> getIndexRangeKeyPropertyNames() {
		final Set<String> propertyNames = new HashSet<String>();
		ReflectionUtils.doWithMethods(getJavaType(), new MethodCallback() {
			public void doWith(Method method) {
				if (method.getAnnotation(DynamoDBIndexRangeKey.class) != null) {
					if ((method.getAnnotation(DynamoDBIndexRangeKey.class).localSecondaryIndexName() != null && method
							.getAnnotation(DynamoDBIndexRangeKey.class).localSecondaryIndexName().trim().length() > 0)
							|| (method.getAnnotation(DynamoDBIndexRangeKey.class).localSecondaryIndexNames() != null && method
									.getAnnotation(DynamoDBIndexRangeKey.class).localSecondaryIndexNames().length > 0)) {
						propertyNames.add(getPropertyNameForAccessorMethod(method));
					}
				}
			}
		});
		ReflectionUtils.doWithFields(getJavaType(), new FieldCallback() {
			public void doWith(Field field) {
				if (field.getAnnotation(DynamoDBIndexRangeKey.class) != null) {
					if ((field.getAnnotation(DynamoDBIndexRangeKey.class).localSecondaryIndexName() != null && field
							.getAnnotation(DynamoDBIndexRangeKey.class).localSecondaryIndexName().trim().length() > 0)
							|| (field.getAnnotation(DynamoDBIndexRangeKey.class).localSecondaryIndexNames() != null && field
									.getAnnotation(DynamoDBIndexRangeKey.class).localSecondaryIndexNames().length > 0)) {
						propertyNames.add(getPropertyNameForField(field));
					}
				}
			}
		});
		return propertyNames;
	}

	public T getHashKeyPropotypeEntityForHashKey(Object hashKey) {

		try {
			T entity = getJavaType().newInstance();
			if (hashKeySetterMethod != null)
			{
				ReflectionUtils.invokeMethod(hashKeySetterMethod, entity, hashKey);
			}
			else
			{
				ReflectionUtils.setField(hashKeyField, entity, hashKey);	
			}

			return entity;
		} catch (InstantiationException e) {
			throw new RuntimeException(e);
		} catch (IllegalAccessException e) {
			throw new RuntimeException(e);
		}
	}
	
	

	@Override
	public boolean isCompositeHashAndRangeKeyProperty(String propertyName) {
		return isFieldAnnotatedWith(propertyName, Id.class);
	}

}