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Cassandra support for Spring Data
/*
* Copyright 2013-2020 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
*
* https://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.expression.EvaluationContext;
import org.springframework.expression.PropertyAccessor;
import org.springframework.expression.TypedValue;
import org.springframework.lang.Nullable;
import com.datastax.driver.core.Row;
/**
* {@link PropertyAccessor} to read values from a {@link Row}.
*
* @author Alex Shvid
* @author Antoine Toulme
* @author Mark Paluch
*/
enum RowReaderPropertyAccessor implements PropertyAccessor {
INSTANCE;
@Override
public Class[] getSpecificTargetClasses() {
return new Class[] { Row.class };
}
@Override
public boolean canRead(EvaluationContext context, @Nullable Object target, String name) {
return target != null && ((Row) target).getColumnDefinitions().contains(name);
}
@Override
public TypedValue read(EvaluationContext context, @Nullable Object target, String name) {
if (target == null) {
return TypedValue.NULL;
}
Row row = (Row) target;
if (row.isNull(name)) {
return TypedValue.NULL;
}
return new TypedValue(row.getObject(name));
}
@Override
public boolean canWrite(EvaluationContext context, @Nullable Object target, String name) {
return false;
}
@Override
public void write(EvaluationContext context, @Nullable Object target, String name, @Nullable Object newValue) {
throw new UnsupportedOperationException();
}
}