/*
* Copyright 2012-2016 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.mongodb.core.convert;
import java.util.Map;
import org.bson.Document;
import org.springframework.context.expression.MapAccessor;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.PropertyAccessor;
import org.springframework.expression.TypedValue;
/**
* {@link PropertyAccessor} to allow entity based field access to {@link Document}s.
*
* @author Oliver Gierke
* @author Christoph Strobl
*/
class DocumentPropertyAccessor extends MapAccessor {
static final MapAccessor INSTANCE = new DocumentPropertyAccessor();
/*
* (non-Javadoc)
* @see org.springframework.context.expression.MapAccessor#getSpecificTargetClasses()
*/
@Override
public Class<?>[] getSpecificTargetClasses() {
return new Class[] { Document.class };
}
/*
* (non-Javadoc)
* @see org.springframework.context.expression.MapAccessor#canRead(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String)
*/
@Override
public boolean canRead(EvaluationContext context, Object target, String name) {
return true;
}
/*
* (non-Javadoc)
* @see org.springframework.context.expression.MapAccessor#read(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String)
*/
@Override
@SuppressWarnings("unchecked")
public TypedValue read(EvaluationContext context, Object target, String name) {
Map<String, Object> source = (Map<String, Object>) target;
Object value = source.get(name);
return value == null ? TypedValue.NULL : new TypedValue(value);
}
}