v2.5
git-svn-id: svn://svn.code.sf.net/p/mockftpserver/code@274 531de8e6-9941-0410-b38b-9a92acbe0330
diff --git a/tags/2.5/src/main/java/org/mockftpserver/core/command/SimpleCompositeCommandHandler.java b/tags/2.5/src/main/java/org/mockftpserver/core/command/SimpleCompositeCommandHandler.java
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+/*
+ * Copyright 2007 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.mockftpserver.core.command;
+
+import org.mockftpserver.core.session.Session;
+import org.mockftpserver.core.util.Assert;
+import org.mockftpserver.core.util.AssertFailedException;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ResourceBundle;
+
+/**
+ * Composite CommandHandler that manages an internal list of CommandHandlers to which it delegates.
+ * The internal CommandHandlers are maintained in an ordered list. Starting with the first
+ * CommandHandler in the list, each invocation of this composite handler will invoke (delegate to)
+ * the current internal CommandHander. Then it moves on the next CommandHandler in the internal list.
+ * <p>
+ * The following example replaces the CWD CommandHandler with a <code>SimpleCompositeCommandHandler</code>.
+ * The first invocation of the CWD command will fail (reply code 500). The seconds will succeed.
+ * <pre><code>
+ *
+ * StubFtpServer stubFtpServer = new StubFtpServer();
+ *
+ * CommandHandler commandHandler1 = new StaticReplyCommandHandler(500);
+ * CommandHandler commandHandler2 = new CwdCommandHandler();
+ *
+ * SimpleCompositeCommandHandler simpleCompositeCommandHandler = new SimpleCompositeCommandHandler();
+ * simpleCompositeCommandHandler.addCommandHandler(commandHandler1);
+ * simpleCompositeCommandHandler.addCommandHandler(commandHandler2);
+ *
+ * stubFtpServer.setCommandHandler("CWD", simpleCompositeCommandHandler);
+ * </code></pre>
+ *
+ * @version $Revision$ - $Date$
+ *
+ * @author Chris Mair
+ */
+public final class SimpleCompositeCommandHandler implements CommandHandler, ReplyTextBundleAware {
+
+ private List commandHandlers = new ArrayList();
+ private int invocationIndex = 0;
+
+ /**
+ * Add a CommandHandler to the internal list of handlers.
+ *
+ * @param commandHandler - the CommandHandler
+ *
+ * @throws AssertFailedException - if the commandHandler is null
+ */
+ public void addCommandHandler(CommandHandler commandHandler) {
+ Assert.notNull(commandHandler, "commandHandler");
+ commandHandlers.add(commandHandler);
+ }
+
+ /**
+ * Set the List of CommandHandlers to which to delegate. This replaces any CommandHandlers that
+ * have been defined previously.
+ * @param commandHandlers - the complete List of CommandHandlers to which invocations are delegated
+ */
+ public void setCommandHandlers(List commandHandlers) {
+ Assert.notNull(commandHandlers, "commandHandlers");
+ this.commandHandlers = new ArrayList(commandHandlers);
+ }
+
+ /**
+ * Return the CommandHandler corresponding to the specified invocation index. In other words, return
+ * the CommandHandler instance to which the Nth {@link #handleCommand(Command, Session)} has been or will
+ * be delegated (where N=index).
+ * @param index - the index of the desired invocation (zero-based).
+ * @return the CommandHandler
+ *
+ * @throws AssertFailedException - if no CommandHandler is defined for the index or the index is not valid
+ */
+ public CommandHandler getCommandHandler(int index) {
+ Assert.isTrue(index < commandHandlers.size(), "No CommandHandler defined for index " + index);
+ Assert.isTrue(index >= 0, "The index cannot be less than zero: " + index);
+ return (CommandHandler) commandHandlers.get(index);
+ }
+
+ /**
+ * @see org.mockftpserver.core.command.CommandHandler#handleCommand(org.mockftpserver.core.command.Command, org.mockftpserver.core.session.Session)
+ */
+ public void handleCommand(Command command, Session session) throws Exception {
+ Assert.notNull(command, "command");
+ Assert.notNull(session, "session");
+ Assert.isTrue(commandHandlers.size() > invocationIndex, "No CommandHandler defined for invocation #" + invocationIndex);
+
+ CommandHandler commandHandler = (CommandHandler) commandHandlers.get(invocationIndex);
+ invocationIndex++;
+ commandHandler.handleCommand(command, session);
+ }
+
+ /**
+ * Returns null. This is a composite, and has no reply text bundle.
+ *
+ * @see org.mockftpserver.core.command.ReplyTextBundleAware#getReplyTextBundle()
+ */
+ public ResourceBundle getReplyTextBundle() {
+ return null;
+ }
+
+ /**
+ * Call <code>setReplyTextBundle()</code> on each of the command handlers within the internal list.
+ *
+ * @see org.mockftpserver.core.command.ReplyTextBundleAware#setReplyTextBundle(java.util.ResourceBundle)
+ */
+ public void setReplyTextBundle(ResourceBundle replyTextBundle) {
+ for (Iterator iter = commandHandlers.iterator(); iter.hasNext();) {
+ CommandHandler commandHandler = (CommandHandler) iter.next();
+ ReplyTextBundleUtil.setReplyTextBundleIfAppropriate(commandHandler, replyTextBundle);
+ }
+ }
+
+}