org.socialsignin.spring.data.dynamodb.repository.query.DynamoDBEntityWithHashKeyOnlyCriteria.java Source code

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Here is the source code for org.socialsignin.spring.data.dynamodb.repository.query.DynamoDBEntityWithHashKeyOnlyCriteria.java

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/*
 * 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.query;

import java.io.Serializable;
import java.util.List;
import java.util.Map;

import org.socialsignin.spring.data.dynamodb.core.DynamoDBOperations;
import org.socialsignin.spring.data.dynamodb.query.CountByHashKeyQuery;
import org.socialsignin.spring.data.dynamodb.query.MultipleEntityQueryRequestQuery;
import org.socialsignin.spring.data.dynamodb.query.MultipleEntityScanExpressionQuery;
import org.socialsignin.spring.data.dynamodb.query.Query;
import org.socialsignin.spring.data.dynamodb.query.QueryRequestCountQuery;
import org.socialsignin.spring.data.dynamodb.query.ScanExpressionCountQuery;
import org.socialsignin.spring.data.dynamodb.query.SingleEntityLoadByHashKeyQuery;
import org.socialsignin.spring.data.dynamodb.repository.support.DynamoDBEntityInformation;

import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBScanExpression;
import com.amazonaws.services.dynamodbv2.model.ComparisonOperator;
import com.amazonaws.services.dynamodbv2.model.Condition;
import com.amazonaws.services.dynamodbv2.model.QueryRequest;

/**
 * @author Michael Lavelle
 */
public class DynamoDBEntityWithHashKeyOnlyCriteria<T, ID extends Serializable>
        extends AbstractDynamoDBQueryCriteria<T, ID> {

    private DynamoDBEntityInformation<T, ID> entityInformation;

    public DynamoDBEntityWithHashKeyOnlyCriteria(DynamoDBEntityInformation<T, ID> entityInformation) {
        super(entityInformation);
        this.entityInformation = entityInformation;
    }

    protected Query<T> buildSingleEntityLoadQuery(DynamoDBOperations dynamoDBOperations) {
        return new SingleEntityLoadByHashKeyQuery<T>(dynamoDBOperations, clazz, getHashKeyPropertyValue());
    }

    protected Query<Long> buildSingleEntityCountQuery(DynamoDBOperations dynamoDBOperations) {
        return new CountByHashKeyQuery<T>(dynamoDBOperations, clazz, getHashKeyPropertyValue());
    }

    protected Query<T> buildFinderQuery(DynamoDBOperations dynamoDBOperations) {
        if (isApplicableForGlobalSecondaryIndex()) {

            List<Condition> hashKeyConditions = getHashKeyConditions();
            QueryRequest queryRequest = buildQueryRequest(
                    dynamoDBOperations.getOverriddenTableName(clazz, entityInformation.getDynamoDBTableName()),
                    getGlobalSecondaryIndexName(), getHashKeyAttributeName(), null, null, hashKeyConditions, null);
            return new MultipleEntityQueryRequestQuery<T>(dynamoDBOperations, entityInformation.getJavaType(),
                    queryRequest);
        } else {
            return new MultipleEntityScanExpressionQuery<T>(dynamoDBOperations, clazz, buildScanExpression());
        }
    }

    protected Query<Long> buildFinderCountQuery(DynamoDBOperations dynamoDBOperations, boolean pageQuery) {
        if (isApplicableForGlobalSecondaryIndex()) {

            List<Condition> hashKeyConditions = getHashKeyConditions();
            QueryRequest queryRequest = buildQueryRequest(
                    dynamoDBOperations.getOverriddenTableName(clazz, entityInformation.getDynamoDBTableName()),
                    getGlobalSecondaryIndexName(), getHashKeyAttributeName(), null, null, hashKeyConditions, null);
            return new QueryRequestCountQuery<T>(dynamoDBOperations, entityInformation.getJavaType(), queryRequest);

        } else {
            return new ScanExpressionCountQuery<T>(dynamoDBOperations, clazz, buildScanExpression(), pageQuery);
        }
    }

    @Override
    protected boolean isOnlyHashKeySpecified() {
        return attributeConditions.size() == 0 && isHashKeySpecified();
    }

    @Override
    public boolean isApplicableForLoad() {
        return isOnlyHashKeySpecified();
    }

    public DynamoDBScanExpression buildScanExpression() {

        if (sort != null) {
            throw new UnsupportedOperationException("Sort not supported for scan expressions");
        }

        DynamoDBScanExpression scanExpression = new DynamoDBScanExpression();
        if (isHashKeySpecified()) {
            scanExpression.addFilterCondition(getHashKeyAttributeName(),
                    createSingleValueCondition(getHashKeyPropertyName(), ComparisonOperator.EQ,
                            getHashKeyAttributeValue(), getHashKeyAttributeValue().getClass(), true));
        }

        for (Map.Entry<String, List<Condition>> conditionEntry : attributeConditions.entrySet()) {
            for (Condition condition : conditionEntry.getValue()) {
                scanExpression.addFilterCondition(conditionEntry.getKey(), condition);
            }
        }
        return scanExpression;
    }

    @Override
    public DynamoDBQueryCriteria<T, ID> withPropertyEquals(String propertyName, Object value,
            Class<?> propertyType) {
        if (isHashKeyProperty(propertyName)) {
            return withHashKeyEquals(value);
        } else {
            Condition condition = createSingleValueCondition(propertyName, ComparisonOperator.EQ, value,
                    propertyType, false);
            return withCondition(propertyName, condition);
        }
    }

}