- /*
- * Copyright 2003-2004 The Apache Software Foundation
- *
- * 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.apache.tools.ant.types.selectors.modifiedselector;
-
-
- import java.util.Iterator;
-
-
- /**
- * A Cache let the user store key-value-pairs in a permanent manner and access
- * them.
- * It is possible that a client uses get() before load() therefore the
- * implementation must ensure that no error occurred because of the wrong
- * <i>order</i>.
- * The implementing class should implement a useful toString() method.
- *
- * @version 2003-09-13
- * @since Ant 1.6
- */
- public interface Cache {
-
- /**
- * Checks its prerequisites.
- * @return <i>true</i> if all is ok, otherwise <i>false</i>.
- */
- boolean isValid();
-
- /** Deletes the cache. If file based the file has to be deleted also. */
- void delete();
-
- /** Loads the cache, must handle not existing cache. */
- void load();
-
- /** Saves modification of the cache. */
- void save();
-
- /**
- * Returns a value for a given key from the cache.
- * @param key the key
- * @return the stored value
- */
- Object get(Object key);
-
- /**
- * Saves a key-value-pair in the cache.
- * @param key the key
- * @param value the value
- */
- void put(Object key, Object value);
-
- /**
- * Returns an iterator over the keys in the cache.
- * @return An iterator over the keys.
- */
- Iterator iterator();
- }