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package com.wcohen.ss;
import java.util.*;
import com.wcohen.ss.api.*;
/**
* A StringWrapper that stores a version of the string
* that has been either (a) split into a number of distinct fields,
* or (b) duplicated k times, so that k different StringDistance's
* can preprocess it, of (b) both of the above.
*/
public class MultiStringWrapper extends BasicStringWrapper
{
private String s;
private StringWrapper[] f;
private int[] learnerIndex, fieldIndex;
private boolean fieldsPrepared;
/** Create a MultiStringWrapper by splitting s into
* fields based on the given delimiter.
*/
public MultiStringWrapper(String s, String delim) { this(s,1,delim); }
/** Create a MultiStringWrapper by making k copies of s. */
public MultiStringWrapper(String s, int numCopies) { this(s,numCopies,null); }
/** Create a MultiStringWrapper by making k copies of each field of s. */
public MultiStringWrapper(String s, int numCopies, String delim) {
super(s);
this.s = s;
String[] fields;
if (delim!=null) fields = s.split(delim,-1);
else fields = new String[]{s};
f = new StringWrapper[ fields.length * numCopies ];
learnerIndex = new int[ f.length ];
fieldIndex = new int[ f.length ];
for (int i=0; i<fields.length; i++) {
for (int j=0; j<numCopies; j++) {
int k = i*numCopies+j;
f[k] = new BasicStringWrapper(fields[i]);
learnerIndex[k] = j;
fieldIndex[k] = i;
}
}
fieldsPrepared = false;
}
/** Return number of fields. */
public int size() { return f.length; }
/** Return the index of the learner that will process internal field i */
public int getDistanceLearnerIndex(int i) { return learnerIndex[i]; }
/** Return the field i of the original string associated with internal field i */
public int getFieldIndex(int i) { return fieldIndex[i]; }
/** Return the i-th field. */
public StringWrapper get(int i) { return f[i]; }
/** Set the i-th field. */
public void set(int i, StringWrapper w) { f[i] = w; }
/** Prepare each field with the appropriate distance */
public void prepare(StringDistance[] innerDistances) {
if (!fieldsPrepared) {
for (int i=0; i<size(); i++) {
StringDistance d = innerDistances[ getDistanceLearnerIndex(i) ];
set( i, d.prepare( get(i).unwrap() ) );
}
}
}
public String toString() {
StringBuffer buf = new StringBuffer("[multiwrap '"+s+"':");
for (int i=0; i<size(); i++) {
buf.append(" '"+get(i)+"'");
}
buf.append("]");
return buf.toString();
}
public static void main(String[] args) {
try {
if (args.length==3) {
int numCopies = Integer.parseInt(args[0]);
String delim = args[1];
String s = args[2];
System.out.println(new MultiStringWrapper(s,numCopies,delim));
} else if (args.length==2) {
int numCopies = Integer.parseInt(args[0]);
String s = args[1];
System.out.println(new MultiStringWrapper(s,numCopies,null));
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("usage: numCopies delim string");
}
}
}
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