--- /dev/null
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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 com.android.cts;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * CommandHistory holds max 50 executed command.
+ * User can view what has been input and select one to execute again.
+ * Example:
+ * <ul>
+ * <li> "cts_host > h" to view latest 50 executed command.
+ * <li> "cts_host > h 10" to view latest 10 executed command.
+ * <li> "cts_host > h -e 5" to execute the 5th executed command.
+ * </ul>
+ */
+public class CommandHistory {
+ private static final int CMD_RECORD_DEPTH = 50;
+
+ private List<String> mCmdRecords;
+
+ public CommandHistory() {
+ mCmdRecords = new ArrayList<String>();
+ }
+
+ /**
+ * Check if the command is history command.
+ *
+ * @param cmd The command string.
+ * @return If it's history command, return true; else return false.
+ */
+ public boolean isHistoryCommand(final String cmd) {
+ return CTSCommand.HISTORY.equals(cmd) || CTSCommand.H.equals(cmd);
+ }
+
+ /**
+ * Get the number of commands recorded.
+ *
+ * @return The number of commands recorded.
+ */
+ public int size() {
+ return mCmdRecords.size();
+ }
+
+ /**
+ * Get command by index from command history cache.
+ *
+ * @param index The command index.
+ * @return The command corresponding to the command index.
+ */
+ public String get(final int index) {
+ return mCmdRecords.get(index);
+ }
+
+ /**
+ * display specified number of commands from command history cache onto CTS console.
+ *
+ * @param cmdCount The command count requested.
+ */
+ public void show(final int cmdCount) {
+ int cmdSize = mCmdRecords.size();
+ int start = 0;
+
+ if (cmdSize == 0) {
+ CUIOutputStream.println("no history command list");
+ return;
+ }
+ if (cmdCount < cmdSize) {
+ start = cmdSize - cmdCount;
+ }
+
+ for (; start < cmdSize; start ++) {
+ String cmdLine = mCmdRecords.get(start);
+ CUIOutputStream.println(" " + Long.toString(start) + "\t" + cmdLine);
+ }
+ }
+
+ /**
+ * Add a command to the command cache.
+ *
+ * @param cp The command container.
+ * @param cmdLine The command line.
+ */
+ public void addCommand(final CommandParser cp,
+ final String cmdLine) {
+ if ((cmdLine == null) || (cmdLine.length() == 0)) {
+ return;
+ }
+
+ if (isValidCommand(cp.getAction()) && (!hasCommand(cmdLine))) {
+ mCmdRecords.add(cmdLine);
+ if (mCmdRecords.size() > CMD_RECORD_DEPTH) {
+ mCmdRecords.remove(0);
+ }
+ }
+ }
+
+ /**
+ * Check if the command contains valid action.
+ *
+ * @param action The action contained in the command.
+ * @return If valid, return true; else, return false.
+ */
+ private boolean isValidCommand(final String action) {
+ if (!(CTSCommand.HISTORY.equals(action) || CTSCommand.H.equals(action))) {
+ if (CTSCommand.ADD.equals(action)
+ || CTSCommand.EXIT.equals(action)
+ || CTSCommand.HELP.equals(action)
+ || CTSCommand.LIST.equals(action)
+ || CTSCommand.REMOVE.equals(action)
+ || CTSCommand.START.equals(action)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Check if the command is a duplicate one.
+ *
+ * @param cmdLine The command to be checked against the commands recorded.
+ * @return If duplicated, return true; else, return false.
+ */
+ private boolean hasCommand(final String cmdLine) {
+ for(String cmd : mCmdRecords) {
+ if (cmd.equals(cmdLine)) {
+ return true;
+ }
+ }
+ return false;
+ }
+}
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