/*
* Copyright 2014-2016 CyberVision, Inc.
*
* 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.kaaproject.kaa.server.operations.service.filter.el;
import org.apache.avro.generic.GenericRecord;
import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.PropertyAccessor;
import org.springframework.expression.TypedValue;
/**
* The Class GenericRecordPropertyAccessor.
*/
public class GenericRecordPropertyAccessor implements PropertyAccessor {
/* (non-Javadoc)
* @see org.springframework.expression.PropertyAccessor#getSpecificTargetClasses()
*/
@Override
public Class<?>[] getSpecificTargetClasses() {
return new Class<?>[]{GenericRecord.class};
}
/* (non-Javadoc)
* @see org.springframework.expression.PropertyAccessor#canRead(org.springframework
* .expression.EvaluationContext, java.lang.Object, java.lang.String)
*/
@Override
public boolean canRead(EvaluationContext context, Object target, String name)
throws AccessException {
GenericRecord record = (GenericRecord) target;
return record.getSchema().getField(name) != null;
}
/* (non-Javadoc)
* @see org.springframework.expression.PropertyAccessor#read(org.springframework
* .expression.EvaluationContext, java.lang.Object, java.lang.String)
*/
@Override
public TypedValue read(EvaluationContext context, Object target, String name)
throws AccessException {
GenericRecord record = (GenericRecord) target;
return new TypedValue(record.get(name));
}
/* (non-Javadoc)
* @see org.springframework.expression.PropertyAccessor#canWrite(org.springframework
* .expression.EvaluationContext, java.lang.Object, java.lang.String)
*/
@Override
public boolean canWrite(EvaluationContext context, Object target,
String name) throws AccessException {
return false;
}
/* (non-Javadoc)
* @see org.springframework.expression.PropertyAccessor#write(org.springframework
* .expression.EvaluationContext, java.lang.Object, java.lang.String, java.lang.Object)
*/
@Override
public void write(EvaluationContext context, Object target, String name,
Object newValue) throws AccessException {
throw new UnsupportedOperationException("Write is not supported");
}
}