Mailing List Archive

--------------------NEW------------AbstractDocument.java

package org.apache.lucene.document;

/* ====================================================================
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/

import java.util.Enumeration;

/**
* Documents are the unit of indexing and search.
*
* A Document is a set of fields. Each field has a name and a textual value.
* A field may be stored with the document, in which case it is returned with
* search hits on the document. Thus each document should typically contain
* stored fields which uniquely identify it.
*
* This Abstract Document provides the interface and internal field collections
* for use in Documents.
*
* @author Doug Cutting?
* @author Andrew C. Oliver (acoliver@users.sourceforge.net)
*/
public abstract class AbstractDocument {
DocumentFieldList fieldList = null;

/** Creates a new instance of AbstractDocument */
public AbstractDocument() {
}

/** Adds a field to a document. Several fields may be added with
* the same name. In this case, if the fields are indexed, their text is
* treated as though appended for the purposes of search. */
public void add(Field field) {
fieldList = new DocumentFieldList(field, fieldList);
}

/** Returns a field with the given name if any exist in this document, or
null. If multiple fields may exist with this name, this method returns the
last added such added. */
public Field getField(String name) {
for (DocumentFieldList list = fieldList; list != null; list = list.next)
if (list.field.name().equals(name))
return list.field;
return null;
}


/** Returns the string value of the field with the given name if any exist in
this document, or null. If multiple fields may exist with this name, this
method returns the last added such added. */
public String get(String name) {
Field field = getField(name);
if (field != null)
return field.stringValue();
else
return null;
}


/** Returns an Enumeration of all the fields in a document. */
public Enumeration fields() {
return new DocumentFieldEnumeration(this);
}

public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append("Document<");
for (DocumentFieldList list = fieldList; list != null; list = list.next) {
buffer.append(list.field.toString());
if (list.next != null)
buffer.append(" ");
}
buffer.append(">");
return buffer.toString();
}



final class DocumentFieldList {
DocumentFieldList(Field f, DocumentFieldList n) {
field = f;
next = n;
}
Field field;
DocumentFieldList next;
}

final class DocumentFieldEnumeration implements Enumeration {
DocumentFieldList fields;
DocumentFieldEnumeration(AbstractDocument d) {
fields = d.fieldList;
}

public final boolean hasMoreElements() {
return fields == null ? false : true;
}

public final Object nextElement() {
Field result = fields.field;
fields = fields.next;
return result;
}
}
}

--
www.superlinksoftware.com
www.sourceforge.net/projects/poi - port of Excel format to java
http://developer.java.sun.com/developer/bugParade/bugs/4487555.html
- fix java generics!


The avalanche has already started. It is too late for the pebbles to
vote.
-Ambassador Kosh


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