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Cassandra support for Spring Data
/*
* Copyright 2013-2018 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.springframework.data.cassandra.core.convert;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentProperty;
import org.springframework.data.mapping.model.DefaultSpELExpressionEvaluator;
import org.springframework.data.mapping.model.SpELExpressionEvaluator;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import com.datastax.driver.core.Row;
/**
* {@link CassandraValueProvider} to read property values from a {@link Row}.
*
* @author Alex Shvid
* @author Matthew T. Adams
* @author David Webb
* @author Mark Paluch
*/
public class BasicCassandraRowValueProvider implements CassandraRowValueProvider {
private final ColumnReader reader;
private final SpELExpressionEvaluator evaluator;
/**
* Create a new {@link BasicCassandraRowValueProvider} with the given {@link Row} and {@link SpELExpressionEvaluator}.
*
* @param source must not be {@literal null}.
* @param evaluator must not be {@literal null}.
* @since 2.1
*/
public BasicCassandraRowValueProvider(Row source, SpELExpressionEvaluator evaluator) {
Assert.notNull(source, "Source Row must not be null");
Assert.notNull(evaluator, "SpELExpressionEvaluator must not be null");
this.reader = new ColumnReader(source);
this.evaluator = evaluator;
}
/**
* Create a new {@link BasicCassandraRowValueProvider} with the given {@link Row} and
* {@link DefaultSpELExpressionEvaluator}.
*
* @param source must not be {@literal null}.
* @param evaluator must not be {@literal null}.
* @deprecated since 2.1, use {@link #BasicCassandraRowValueProvider(Row, SpELExpressionEvaluator)}
*/
@Deprecated
public BasicCassandraRowValueProvider(Row source, DefaultSpELExpressionEvaluator evaluator) {
this(source, (SpELExpressionEvaluator) evaluator);
}
/* (non-Javadoc)
* @see org.springframework.data.mapping.model.PropertyValueProvider#getPropertyValue(org.springframework.data.mapping.PersistentProperty)
*/
@Nullable
@Override
@SuppressWarnings("unchecked")
public T getPropertyValue(CassandraPersistentProperty property) {
String spelExpression = property.getSpelExpression();
return spelExpression != null
? this.evaluator.evaluate(spelExpression)
: (T) this.reader.get(property.getRequiredColumnName());
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.convert.CassandraRowValueProvider#getRow()
*/
@Override
public Row getRow() {
return this.reader.getRow();
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.convert.CassandraValueProvider#hasProperty(org.springframework.data.cassandra.core.mapping.CassandraPersistentProperty)
*/
@Override
public boolean hasProperty(CassandraPersistentProperty property) {
Assert.notNull(property, "CassandraPersistentProperty must not be null");
return getRow().getColumnDefinitions().contains(property.getRequiredColumnName().toCql());
}
}