/* (non-Javadoc)
* @see lexelt.ILexeltWriter#getInstances(lexelt.ILexelt)
*/
public Object getInstances(ILexelt p_Lexelt) throws ClassNotFoundException {
svm_problem retVal = new svm_problem();
ArrayList<svm_node[]> featureVectors = new ArrayList<svm_node[]>();
ArrayList<Double> classes = new ArrayList<Double>();
int[][] indice = this.loadStatistic(p_Lexelt);
if (indice == null) {
throw new IllegalArgumentException("the input lexelt should not be null.");
}
IStatistic stat = p_Lexelt.getStatistic();
int size = p_Lexelt.size(); // instance count
for (int i = 0; i < size; i++) {
IInstance instance = p_Lexelt.getInstance(i);
svm_node[] featureVector = this.getVector(instance, stat, indice);
ArrayList<String> tags = instance.getTag();
if (tags.size() > 0) {
for (String tag : tags) {
double c = Double.parseDouble(tag);
featureVectors.add(Arrays.copyOf(featureVector, featureVector.length));
classes.add(c);
}
} else {
featureVectors.add(featureVector);
classes.add(new Double(0));
}
}
retVal.l = featureVectors.size();
retVal.x = new svm_node[retVal.l][];
retVal.y = new double[retVal.l];
for (int i = 0; i < featureVectors.size(); i++) {
retVal.x[i] = featureVectors.get(i);
retVal.y[i] = classes.get(i);
}
return retVal;
}
/* (non-Javadoc)
* @see lexelt.ILexeltWriter#getString(lexelt.ILexelt)
*/
public String toString(ILexelt p_iLexelt) throws ClassNotFoundException {
int[][] indice = this.loadStatistic(p_iLexelt);
if (indice == null) {
throw new IllegalArgumentException("the input lexelt should not be null.");
}
StringBuilder builder = new StringBuilder();
IStatistic stat = p_iLexelt.getStatistic();
int size = p_iLexelt.size(); // instance count
for (int i = 0; i < size; i++) {
IInstance instance = p_iLexelt.getInstance(i);
builder.append(this.toString(instance, stat, indice));
}
return builder.toString();
}
/* (non-Javadoc)
* @see lexelt.ILexeltWriter#write(java.lang.String, lexelt.ILexelt)
*/
public void write(String p_Filename, ILexelt p_iLexelt)
throws IOException, ClassNotFoundException {
int[][] indice = this.loadStatistic(p_iLexelt);
if (indice == null) {
throw new IllegalArgumentException("the input lexelt should not be null.");
}
BufferedWriter writer = new BufferedWriter(new FileWriter(p_Filename));
IStatistic stat = p_iLexelt.getStatistic();
int size = p_iLexelt.size(); // instance count
for (int i = 0; i < size; i++) {
IInstance instance = p_iLexelt.getInstance(i);
writer.write(this.toString(instance, stat, indice));
}
writer.flush();
writer.close();
}
/**
* load the statistic of p_iLexelt for each feature type in statistic if feature is binary keep it
* else if feature is list and the number of values is less than 2 one new feature else set each
* value as a new feature
*
* @param p_iLexelt lexelt
* @return indices
* @throws ClassNotFoundException cannot find the defined type
*/
protected int[][] loadStatistic(ILexelt p_iLexelt) throws ClassNotFoundException {
int[][] retIndice = null;
int accuIndex = 1;
if (p_iLexelt != null) {
IStatistic stat = p_iLexelt.getStatistic();
int keySize = stat.getKeys().size();
retIndice = new int[keySize][0];
int keyIndex = 0;
for (keyIndex = 0; keyIndex < keySize; keyIndex++) {
Class<?> type = Class.forName(stat.getType(keyIndex));
if (ANumericFeature.class.isAssignableFrom(type)
|| ABinaryFeature.class.isAssignableFrom(type)) {
retIndice[keyIndex] = new int[] {accuIndex++};
} else {
List<String> values = stat.getValue(keyIndex);
retIndice[keyIndex] = new int[values.size()];
for (int i = 0; i < values.size(); i++) {
retIndice[keyIndex][i] = accuIndex++;
}
}
}
}
return retIndice;
}