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Command.cpp

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+/**Copyright (c) 2013 Jian Luo (romain_cool@163.com)
+* Command.cpp
+* The implementation of Command class: implement all the functions in Command class
+*/
+#include "Command.h"
+#include<iostream>
+#include<fstream>
+#include<stdlib.h>
+
+using namespace std;
+
+/**
+* Default Constructor
+*/
+Command::Command(void)
+{
+	m_shellName = "AB";
+
+	string jsonStr = ReadFile();
+
+	m_jsonList = new JSONList(jsonStr);
+}
+
+/**
+* Constructor
+* @param shellName: the name of the shell
+*/
+Command::Command(string shellName)
+{
+	m_shellName = shellName;
+
+	string jsonStr = ReadFile();
+
+	m_jsonList = new JSONList(jsonStr);
+}
+
+Command::~Command(void)
+{
+	delete m_jsonList;
+}
+
+/**
+* Run the command application
+*/
+void Command::Run(void)
+{
+	bool quitFlag = false;
+	while (!quitFlag)
+	{
+		DisplayShell();
+		int com = 0;
+		com = ReadString();
+
+		switch (com)
+		{
+		case 0:
+			cout << "Command Wrong!\n\n";
+			GetHelp();
+			break;
+		case 1:
+			m_jsonList->getls();
+			break;
+		case 2:
+			m_jsonList->getcd(m_secondCmd);
+			break;
+		case 3:
+			m_jsonList->getcat(m_secondCmd);
+			break;
+		case 4:
+			m_jsonList->getadd();
+			break;
+		case 5:
+			m_jsonList->getremove();
+			break;
+		case 6:
+			GetHelp();
+			break;
+		case 7:
+			if (m_jsonList->GetDirty())
+			{
+				WriteFile();
+			}
+			quitFlag = true;
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+/**
+* Display the shell name
+*/
+void Command::DisplayShell()
+{
+	cout << m_shellName << ">";
+}
+
+/**
+* Read a command line from console
+*/
+string Command::GetFromConsole()
+{
+	string line = "";
+	getline(cin,line);
+	return line;
+}
+
+/**
+* Analyze the command line
+* @return com: command type, 0-7
+*/
+int Command::ReadString()
+{
+	int com = 0;
+	string line = "";
+
+	line = GetFromConsole();
+
+	// delete the space in front of the command line
+	int start = 0;
+	while (line[start] == ' ')
+	{
+		start++;
+	}
+	line = line.substr(start);
+
+	if (line.empty())
+	{
+		return com;
+	}
+
+	int i = line.find(" ");
+	if (i == -1)// only have the first command
+	{
+		m_firstCmd = line;
+		m_secondCmd = "";
+	}else
+	{
+		m_firstCmd = line.substr(0,i);
+		m_secondCmd = line.substr(i+1);
+
+		// delete the space in front of the second command 
+		int j = 0;
+		while (m_secondCmd[j] == ' ')
+		{
+			j++;
+		}
+		m_secondCmd = '\"' + m_secondCmd.substr(j) + '\"';
+	}
+
+	if ("ls" == m_firstCmd && m_secondCmd.empty())
+	{
+		com = 1;
+	}else if ("cd" == m_firstCmd && !m_secondCmd.empty())
+	{
+		com = 2;
+	}else if ("cat" == m_firstCmd && !m_secondCmd.empty())
+	{
+		com = 3;
+	}else if ("add" == m_firstCmd && m_secondCmd.empty())
+	{
+		com = 4;
+	}else if ("remove" == m_firstCmd && m_secondCmd.empty())
+	{
+		com = 5;
+	}else if ("!help" == m_firstCmd && m_secondCmd.empty())
+	{
+		com = 6;
+	}else if ("!quit" == m_firstCmd && m_secondCmd.empty())
+	{
+		com = 7;
+	}
+
+	return com;
+}
+
+/**
+* Read data from file "data.txt"
+* @return jsonStr: the data string saved int file "data.txt"
+*/
+string Command::ReadFile()
+{
+	ifstream inFile;
+	inFile.open("data.txt");
+	if (!inFile)
+	{
+		cout << "File open error, data load failure!\n";
+		exit(0);
+	}
+
+	string jsonStr;
+	getline(inFile, jsonStr);
+	inFile.close();
+
+	return jsonStr;
+}
+
+/**
+* Write data into file "data.txt" when quit from application.
+*/
+void Command::WriteFile()
+{
+	ofstream outFile("data.txt");
+	if (!outFile)
+	{
+		cout << "File open error, data save failure!\n";
+		exit(0);
+	}
+	outFile << m_jsonList->GetValue(m_jsonList->GetRootNode());
+	outFile.close();
+}
+
+
+/**
+* Get help message for the command application
+*/
+void Command::GetHelp()
+{
+	string sb = "Help!\n";
+	sb.append("ls           :command to list the items in current position\n");
+	sb.append("cd [entry]   :command to go to the entry like go to a directory\n");
+	sb.append("cat [key]    :command to display th item data\n");
+	sb.append("add          :command to add new address entry to JSON\n");
+	sb.append("remove [key] :command to remove one or more address entries\n");
+	sb.append("!help        :commadn to get help\n");
+	sb.append("!quit        :command to quit from the application\n");
+	cout << sb;
+}

Command.h

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+/**Copyright (c) 2013 Jian Luo (romain_cool@163.com)
+* Command.h
+* Command class: acts as the interface between the user and the application
+*/
+#ifndef COMMAND
+#define COMMAND
+
+#include"JSONList.h"
+
+class Command
+{
+public:
+	Command(void);
+	Command(std::string shell);
+	~Command(void);
+
+	void Run(void);
+
+	std::string GetFromConsole();
+
+	int ReadString();
+
+	std::string ReadFile();
+
+	void WriteFile();
+
+	void DisplayShell();
+
+	void GetHelp();
+
+private:
+	JSONList *m_jsonList;
+
+	std::string m_firstCmd;
+	std::string m_secondCmd;
+
+	std::string m_shellName;
+};
+
+#endif
+