source: main/trunk/greenstone3/src/java/org/greenstone/util/ScriptReadWrite.java@ 25635

package org.greenstone.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.StringTokenizer;

public class ScriptReadWrite {

    public ScriptReadWrite() {
    }

    public ArrayList<String> readInFile(File file) {
    try {
        ArrayList<String> fileLines = new ArrayList<String>();
        String oneLine = null;
        BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
        while ((oneLine = bufferedReader.readLine()) != null) {
        fileLines.add(oneLine);
        }
        bufferedReader.close();
        return fileLines;
    } catch (Exception e) {
        System.err.println("exception:" + e);
        return null;
    }
    }

    public void writeOutFile(File file, ArrayList<String> fileLines_in) {
    try {
        PrintWriter printWriter = new PrintWriter(new BufferedWriter(new FileWriter(file)));
        for (int i = 0; i < fileLines_in.size(); i++) {
        printWriter.println(fileLines_in.get(i));
        }
        printWriter.flush();
        printWriter.close();
    } catch (Exception e) {
        System.err.println("exception:" + e);
    }
    }

    public ArrayList<String> queryReplace(ArrayList<String> fileLines_ex, String param,
                  String newValue) {
    // only replace existing, don't append if param does not exist
    return replaceOrAddLine(fileLines_ex, param, newValue, false); 
    }
    
    // if the parameter exists, then a replace is performed, else the parameter-value
    // is appended
    public ArrayList<String> replaceOrAddLine(ArrayList<String> fileLines_ex, String param, String newValue, 
                      boolean replaceElseAdd) 
    {   
    String oneLine = null;
    String newLine = null;
    String name = null;
    // int oneLine_length = 0;
    param = param.trim();
    // int param_length = param.length();

    for (int i = 0; i < fileLines_ex.size(); i++) {
        oneLine = fileLines_ex.get(i).trim();
        // oneLine_length = oneLine.length();
        StringTokenizer st = new StringTokenizer(oneLine, "=");
        if (st.hasMoreTokens()) {
        name = st.nextToken();
        if (param.equals(name)) {
            newLine = param + "=" + newValue;
            fileLines_ex.set(i, newLine);
            replaceElseAdd = false; // replaced, no longer need to add in any case
            break;
        }
        }
    }
    // If we've made no replacement and need to append the new item
    if(replaceElseAdd) {
        fileLines_ex.add(param+"="+newValue);
    }
    return fileLines_ex;
    }

    public String existValue(ArrayList fileLines, String querytext) {
    String retValue = null;
    String oneline = null;
    String name = null;
    // String value=null;
    // int oneline_length = 0;
    querytext = querytext.trim();
    // int querytext_length = querytext.length();
    for (int i = 0; i < fileLines.size(); i++) {
        oneline = ((String) fileLines.get(i)).trim();
        // oneline_length = oneline.length();
        StringTokenizer st = new StringTokenizer(oneline, "=");
        if (st.hasMoreTokens()) {
        name = st.nextToken();
        if (querytext.equals(name)) {
            if (st.hasMoreTokens()) {
            retValue = st.nextToken();
            retValue = retValue.trim();
            if (retValue.equals("")) {
                retValue = null;
            }
            } else {
            retValue = null;
            }
            break;
        }
        }
    }
    return retValue;
    }
}