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package org.apache.velocity.context;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
/**
* Interface describing the application data context. This set of
* routines is used by the application to set and remove 'named' data
* object to pass them to the template engine to use when rendering
* a template.
*
* This is the same set of methods supported by the original Context
* class
*
* @see org.apache.velocity.context.AbstractContext
* @see org.apache.velocity.VelocityContext
*
* @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id$
*/
public interface Context
{
/**
* Adds a name/value pair to the context.
*
* @param key The name to key the provided value with.
* @param value The corresponding value.
* @return The old object or null if there was no old object.
*/
Object put(String key, Object value);
/**
* Gets the value corresponding to the provided key from the context.
*
* @param key The name of the desired value.
* @return The value corresponding to the provided key.
*/
Object get(String key);
/**
* Indicates whether the specified key is in the context.
*
* @param key The key to look for.
* @return Whether the key is in the context.
*/
boolean containsKey(String key);
/**
* Get all the keys for the values in the context.
* @return All the keys for the values in the context.
*/
String[] getKeys();
/**
* Removes the value associated with the specified key from the context.
*
* @param key The name of the value to remove.
* @return The value that the key was mapped to, or <code>null</code>
* if unmapped.
*/
Object remove(String key);
}
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