001 // Copyright 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.record; 016 017 import java.util.List; 018 019 /** 020 * Responsible for encoding {@link org.apache.tapestry.record.PropertyChange}s into and out of plain 021 * strings. 022 * 023 * @author Howard M. Lewis Ship 024 * @since 4.0 025 */ 026 public interface PersistentPropertyDataEncoder 027 { 028 /** 029 * Encodes a (possibly empty) list of {@link PropertyChange}s into a string representation that 030 * can later be decoded. 031 * 032 * @returns encoded string (possibly empty, but not null) 033 */ 034 public String encodePageChanges(List changes); 035 036 /** 037 * Takes a string with an encoded set of page changes, and converts it back into a list of 038 * {@link org.apache.tapestry.record.PropertyChange}s. 039 */ 040 041 public List decodePageChanges(String encoded); 042 043 }