//--------------------------------------------------------------------------
// Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// Neither the name of the Drew Davidson nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
//--------------------------------------------------------------------------
package org.apache.ibatis.ognl;
import java.util.Map;
/**
* This interface defines methods for setting and getting a property from a target object.
* A "property" in this case is a named data value that takes the generic form of an
* Object---the same definition as is used by beans. But the operational semantics of the
* term will vary by implementation of this interface: a bean-style implementation will
* get and set properties as beans do, by reflection on the target object's class, but
* other implementations are possible, such as one that uses the property name as a key
* into a map.
* <p/>
* <p> An implementation of this interface will often require that its target objects all
* be of some particular type. For example, the MapPropertyAccessor class requires that
* its targets all implement the java.util.Map interface.
* <p/>
* <p> Note that the "name" of a property is represented by a generic Object. Some
* implementations may require properties' names to be Strings, while others may allow
* them to be other types---for example, ArrayPropertyAccessor treats Number names as
* indexes into the target object, which must be an array.
*
* @author Luke Blanshard ([email protected])
* @author Drew Davidson ([email protected])
*/
public interface PropertyAccessor {
/**
* Extracts and returns the property of the given name from the given target object.
*
* @param target the object to get the property from
* @param name the name of the property to get
* @return the current value of the given property in the given object
* @throws OgnlException if there is an error locating the property in the given object
*/
Object getProperty(Map context, Object target, Object name) throws OgnlException;
/**
* Sets the value of the property of the given name in the given target object.
*
* @param target the object to set the property in
* @param name the name of the property to set
* @param value the new value for the property
* @throws OgnlException if there is an error setting the property in the given object
*/
void setProperty(Map context, Object target, Object name, Object value) throws OgnlException;
}
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