/*
* Copyright 2002-2009 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.ui;
import java.util.Collection;
import java.util.Map;
/**
* Java-5-specific interface that defines a holder for model attributes.
* Primarily designed for adding attributes to the model.
* Allows for accessing the overall model as a <code>java.util.Map</code>.
*
* @author Juergen Hoeller
* @since 2.5.1
*/
public interface Model {
/**
* Add the supplied attribute under the supplied name.
* @param attributeName the name of the model attribute (never <code>null</code>)
* @param attributeValue the model attribute value (can be <code>null</code>)
*/
Model addAttribute(String attributeName, Object attributeValue);
/**
* Add the supplied attribute to this <code>Map</code> using a
* {@link org.springframework.core.Conventions#getVariableName generated name}.
* <p><emphasis>Note: Empty {@link java.util.Collection Collections} are not added to
* the model when using this method because we cannot correctly determine
* the true convention name. View code should check for <code>null</code> rather
* than for empty collections as is already done by JSTL tags.</emphasis>
* @param attributeValue the model attribute value (never <code>null</code>)
*/
Model addAttribute(Object attributeValue);
/**
* Copy all attributes in the supplied <code>Collection</code> into this
* <code>Map</code>, using attribute name generation for each element.
* @see #addAttribute(Object)
*/
Model addAllAttributes(Collection<?> attributeValues);
/**
* Copy all attributes in the supplied <code>Map</code> into this <code>Map</code>.
* @see #addAttribute(String, Object)
*/
Model addAllAttributes(Map<String, ?> attributes);
/**
* Copy all attributes in the supplied <code>Map</code> into this <code>Map</code>,
* with existing objects of the same name taking precedence (i.e. not getting
* replaced).
*/
Model mergeAttributes(Map<String, ?> attributes);
/**
* Does this model contain an attribute of the given name?
* @param attributeName the name of the model attribute (never <code>null</code>)
* @return whether this model contains a corresponding attribute
*/
boolean containsAttribute(String attributeName);
/**
* Return the current set of model attributes as a Map.
*/
Map<String, Object> asMap();
}
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