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A Struts2 plugin for leveraging conversation scopes in Struts2
/*******************************************************************************
*
* Struts2-Conversation-Plugin - An Open Source Conversation- and Flow-Scope Solution for Struts2-based Applications
* =================================================================================================================
*
* Copyright (C) 2012 by Rees Byars
* http://code.google.com/p/struts2-conversation/
*
* **********************************************************************************************************************
*
* 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.
*
* **********************************************************************************************************************
*
* $Id: ConversationUtil.java reesbyars $
******************************************************************************/
package com.google.code.rees.scope.conversation;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import com.google.code.rees.scope.conversation.context.ConversationContext;
/**
* Provides static methods intended primarily for use internally and in unit
* testing. Use outside of these contexts should come only as a last resort.
*
* @author rees.byars
*
*/
public class ConversationUtil {
/**
* Given a conversation name, returns the ID of the conversation for the
* currently executing thread.
*
* @param conversationName
* @return
*/
public static String getId(String conversationName) {
if (!conversationName.endsWith(ConversationConstants.CONVERSATION_NAME_SUFFIX)) {
conversationName += ConversationConstants.CONVERSATION_NAME_SUFFIX;
}
ConversationAdapter adapter = ConversationAdapter.getAdapter();
String id = (String) adapter.getRequestContext().get(conversationName);
return id;
}
/**
* Given a conversation field's name, the value of the field is returned
* from a conversation map in the current thread.
*
* @param fieldName
* @return
*/
public static Object getField(String fieldName) {
Object field = null;
ConversationAdapter adapter = ConversationAdapter.getAdapter();
if (adapter != null) {
Map requestContext = adapter.getRequestContext();
for (Entry entry : requestContext.entrySet()) {
String name = entry.getKey();
String id = entry.getValue();
Map conversationContext = adapter.getConversationContext(name, id);
if (conversationContext != null) {
field = (Object) conversationContext.get(fieldName);
if (field != null)
break;
}
}
}
return field;
}
/**
* Given a conversation field's name and class, the value of the field is
* returned from a conversation map in the current thread.
*
* @param
* @param fieldName
* @param fieldClass
* @return
*/
public static T getField(String fieldName, Class fieldClass) {
return getField(fieldName, fieldClass, getConversations());
}
/**
* Given a conversation field's name and class and an Array of conversation
* names, the value of the field is returned from the first conversation in
* the Array that contains an instance of the field.
*
* @param
* @param fieldName
* @param fieldClass
* @param conversations
* @return
*/
@SuppressWarnings("unchecked")
public static T getField(String fieldName, Class fieldClass,String[] conversations) {
T field = null;
ConversationAdapter adapter = ConversationAdapter.getAdapter();
if (adapter != null) {
for (String conversationName : conversations) {
String id = getId(conversationName);
if (id != null) {
Map conversationContext = adapter.getConversationContext(conversationName, id);
if (conversationContext != null) {
field = (T) conversationContext.get(fieldName);
if (field != null)
break;
}
}
}
}
return field;
}
/**
* Given a conversation field's name and an instance, the value is set for
* the field in all active conversations of which the field is a member.
*
* @param fieldName
* @param fieldValue
*/
public static void setField(String fieldName, Object fieldValue) {
ConversationAdapter adapter = ConversationAdapter.getAdapter();
if (adapter != null) {
Map requestContext = adapter.getRequestContext();
for (Entry entry : requestContext.entrySet()) {
String name = entry.getKey();
String id = entry.getValue();
Map conversationContext = adapter.getConversationContext(name, id);
conversationContext.put(fieldName, fieldValue);
}
}
}
/**
* A convenience method for beginning a conversation programmatically
*
* @param name
* @return a new {@link ConversationContext}
*/
public static ConversationContext begin(String name) {
return begin(name, ConversationAdapter.getAdapter());
}
/**
* A convenience method for beginning a conversation programmatically
*
* @param name
* @param maxIdleTimeMillis
* @return
*/
public static ConversationContext begin(String name, long maxIdleTimeMillis) {
return begin(name, ConversationAdapter.getAdapter(), maxIdleTimeMillis);
}
/**
* A convenience method for beginning a conversation programmatically
*
* @param name
* @return a new {@link ConversationContext}
*/
public static ConversationContext begin(String name, ConversationAdapter adapter) {
String id = generateId();
adapter.getViewContext().put(name, id);
adapter.getRequestContext().put(name, id);
return adapter.getConversationContext(name, id);
}
/**
* A convenience method for beginning a conversation programmatically
*
* @param name
* @param adapter
* @param maxIdleTimeMillis
* @return
*/
public static ConversationContext begin(String name, ConversationAdapter adapter, long maxIdleTimeMillis) {
String id = generateId();
adapter.getViewContext().put(name, id);
adapter.getRequestContext().put(name, id);
return adapter.getConversationContext(name, id, maxIdleTimeMillis);
}
/**
* Persist a conversation programmatically
*
* @param name
* @return The {@link ConversationContext} or null if the
* conversation is not active
*/
public static ConversationContext persist(String name) {
return persist(name, ConversationAdapter.getAdapter());
}
/**
* Persist a conversation programmatically
*
* @param name
* @return The {@link ConversationContext} or null if the
* conversation is not active
*/
public static ConversationContext persist(String name, ConversationAdapter adapter) {
String id = adapter.getRequestContext().get(name);
if (id == null) {
return null;
}
adapter.getViewContext().put(name, id);
return adapter.getConversationContext(name, id);
}
/**
* A convenience method for ending a conversation programmatically.
*
* @param name
* @return The {@link ConversationContext} or null if the
* conversation is not active
*/
public static ConversationContext end(String name) {
return end(name, ConversationAdapter.getAdapter());
}
/**
* A convenience method for ending a conversation programmatically.
*
* @param name
* @return The {@link ConversationContext} or null if the
* conversation is not active
*/
public static ConversationContext end(String name, ConversationAdapter adapter) {
String id = adapter.getRequestContext().remove(name);
if (id == null) {
return null;
}
adapter.getViewContext().remove(name);
return adapter.endConversation(name, id);
}
/**
* Given the conversation name, returns that conversation's context for the
* current request.
*
* @param name
* @return The {@link ConversationContext} or null if the
* conversation is not active
*/
public static ConversationContext getContext(String name) {
ConversationAdapter adapter = ConversationAdapter.getAdapter();
String id = adapter.getRequestContext().get(name);
if (id == null) {
return null;
}
return adapter.getConversationContext(name, id);
}
/**
* An array of all active conversations for the current request.
*
* @return
*/
public static String[] getConversations() {
List convoIds = new ArrayList();
ConversationAdapter adapter = ConversationAdapter.getAdapter();
if (adapter != null) {
Map requestContext = adapter.getRequestContext();
convoIds.addAll(requestContext.keySet());
}
return convoIds.toArray(new String[convoIds.size()]);
}
/**
* Returns an array of all the conversation IDs on the current request
*
* @return
*/
public static String[] getIds() {
List convoIds = new ArrayList();
ConversationAdapter adapter = ConversationAdapter.getAdapter();
if (adapter != null) {
Map requestContext = adapter.getRequestContext();
convoIds.addAll(requestContext.values());
}
return convoIds.toArray(new String[convoIds.size()]);
}
/**
* Used to remove undesired characters from conversation names
*
* @param conversationName
* @return
*/
public static String sanitizeName(String conversationName) {
return conversationName.replaceAll(":", "").replaceAll(",", "");
}
/**
* Used to generate a unique ID for a conversation context
*
* @return
*/
public static String generateId() {
return java.util.UUID.randomUUID().toString();
}
}