The current document class is not that friendly if you
are trying to do things efficiently...
- uses Vector, which is synchronized
- can't use java5 "for (Field f : doc)"
- can't get size()
- can't get all fields into a Field[]
- can't use with any generic code that works on
Collections or Lists
Proposal: Document should implement the List or
Collection interface
Example: here is a quick example that inherits from
ArrayList to quickly implement the needed List
functionality. It should be completely backward
compatible. If there is interest, I can flesh it out
a bit more...
-Yonik
import org.apache.lucene.document.Field;
import java.util.*;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;
public final class Document extends ArrayList
implements List {
private float boost = 1.0f;
/** Constructs a new document with no fields. */
public Document() {}
// non List methods
public void setBoost(float boost) {
this.boost = boost;
}
public float getBoost() {
return boost;
}
//
// all methods after this are provided for
// backward compatability with the old Document
//
public final void removeField(String name) {
Iterator it = iterator();
while (it.hasNext()) {
Field field = (Field)it.next();
if (field.name().equals(name)) {
it.remove();
return;
}
}
}
public final void removeFields(String name) {
Iterator it = iterator();
while (it.hasNext()) {
Field field = (Field)it.next();
if (field.name().equals(name)) {
it.remove();
}
}
}
public final Field getField(String name) {
for (int i = 0; i < size(); i++) {
Field field = (Field)get(i);
if (field.name().equals(name))
return field;
}
return null;
}
public final String get(String name) {
Field field = getField(name);
if (field != null)
return field.stringValue();
else
return null;
}
public final Enumeration fields() {
return Collections.enumeration(this);
}
public final Field[] getFields(String name) {
List result = new ArrayList();
for (int i = 0; i < size(); i++) {
Field field = (Field)get(i);
if (field.name().equals(name)) {
result.add(field);
}
}
if (result.size() == 0)
return null;
return (Field[])result.toArray(new
Field[result.size()]);
}
public final String[] getValues(String name) {
Field[] namedFields = getFields(name);
if (namedFields == null)
return null;
String[] values = new
String[namedFields.length];
for (int i = 0; i < namedFields.length; i++) {
values[i] = namedFields[i].stringValue();
}
return values;
}
public final String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append("Document<");
for (int i = 0; i < size(); i++) {
Field field = (Field)get(i);
buffer.append(field.toString());
if (i != size()-1)
buffer.append(" ");
}
buffer.append(">");
return buffer.toString();
}
}
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