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package driver;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Hashtable;
import fileIO.TextFile;
public class MergeTextFiles {
public static void main(String[] args){
CharSequence sb=mergeWithHeader(args[0], args[1], 0, 1);
System.out.println(sb);
}
public static StringBuilder mergeWithHeader(String fname1, String fname2, int col1, int col2){
TextFile tf1=new TextFile(fname1, false);
String[][] lines1=TextFile.doublesplitTab(tf1.toStringLines(), false);
tf1.close();
tf1=null;
TextFile tf2=new TextFile(fname2, false);
String[][] lines2=TextFile.doublesplitTab(tf2.toStringLines(), false);
tf2.close();
tf2=null;
int maxWidth1=findMaxWidth(lines1);
int maxWidth2=findMaxWidth(lines2);
Hashtable<String, String[]> table1=makeTable(lines1, col1, 1);
Hashtable<String, String[]> table2=makeTable(lines2, col2, 1);
HashSet<String> keySet=new HashSet<String>();
keySet.addAll(table1.keySet());
keySet.addAll(table2.keySet());
String[] keys=keySet.toArray(new String[0]);
Arrays.sort(keys);
StringBuilder sb=new StringBuilder();
sb.append(toString(lines1[0], lines2[0], maxWidth1, maxWidth2));
sb.append('\n');
for(String key : keys){
String[] line1=table1.get(key);
String[] line2=table2.get(key);
if(line1==null){
line1=new String[col1+1];
line1[col1]=line2[col2];
}
sb.append(toString(line1, line2, maxWidth1, maxWidth2));
sb.append('\n');
}
return sb;
}
private static StringBuilder toString(String[] a, String[] b, int alen, int blen){
StringBuilder sb=new StringBuilder();
for(int i=0; i<alen; i++){
if(a!=null && a.length>i && a[i]!=null){
sb.append(a[i]);
}
sb.append('\t');
}
for(int i=0; i<blen; i++){
if(b!=null && b.length>i && b[i]!=null){
sb.append(b[i]);
}
sb.append('\t');
}
return sb;
}
private static Hashtable<String, String[]> makeTable(String[][] lines, int col, int firstLine) {
Hashtable<String, String[]> table=new Hashtable<String, String[]>();
for(int i=firstLine; i<lines.length; i++){
String[] line=lines[i];
table.put(line[col], line);
}
return table;
}
private static int findMaxWidth(String[][] matrix){
int max=0;
for(String[] line : matrix){
if(line!=null && max<line.length){max=line.length;}
}
return max;
}
}
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