org.marc4j.MarcXmlHandler Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of freelib-marc4j Show documentation
Show all versions of freelib-marc4j Show documentation
An easy to use Application Programming Interface (API) for working with MARC and MARCXML in
Java.
/**
* Copyright (C) 2004 Bas Peters
*
* This file is part of MARC4J
*
* MARC4J is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* MARC4J is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with MARC4J; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package org.marc4j;
import java.util.HashMap;
import org.marc4j.marc.ControlField;
import org.marc4j.marc.DataField;
import org.marc4j.marc.Leader;
import org.marc4j.marc.MarcFactory;
import org.marc4j.marc.Record;
import org.marc4j.marc.Subfield;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
/**
* Creates Record objects from SAX events and pushes each item onto
* the top of the RecordStack.
*
* @author Bas Peters
*/
public class MarcXmlHandler implements ContentHandler {
private RecordStack queue;
// private InputSource input;
private StringBuffer sb;
private Subfield subfield;
private ControlField controlField;
private DataField dataField;
private Record record;
private String tag;
/** Constants representing each valid tag type */
private static final int COLLECTION_ID = 1;
private static final int LEADER_ID = 2;
private static final int RECORD_ID = 3;
private static final int CONTROLFIELD_ID = 4;
private static final int DATAFIELD_ID = 5;
private static final int SUBFIELD_ID = 6;
/** The tag attribute name string */
private static final String TAG_ATTR = "tag";
/** The code attribute name string */
private static final String CODE_ATTR = "code";
/** The first indicator attribute name string */
private static final String IND_1_ATTR = "ind1";
/** The second indicator attribute name string */
private static final String IND_2_ATTR = "ind2";
/** Hashset for mapping of element strings to constants (Integer) */
private static final HashMap elementMap;
private MarcFactory factory = null;
static {
elementMap = new HashMap();
elementMap.put("collection", new Integer(COLLECTION_ID));
elementMap.put("leader", new Integer(LEADER_ID));
elementMap.put("record", new Integer(RECORD_ID));
elementMap.put("controlfield", new Integer(CONTROLFIELD_ID));
elementMap.put("datafield", new Integer(DATAFIELD_ID));
elementMap.put("subfield", new Integer(SUBFIELD_ID));
}
/**
* Default constructor.
*
* @param queue
*/
public MarcXmlHandler(RecordStack queue) {
this.queue = queue;
factory = MarcFactory.newInstance();
}
/**
* An event fired at the start of the document.
*/
public void startDocument() throws SAXException {
}
/**
* An event fired at the start of an element.
*/
public void startElement(String uri, String name, String qName,
Attributes atts) throws SAXException {
String realname = (name.length() == 0) ? qName : name;
Integer elementType = (Integer) elementMap.get(realname);
if (elementType == null) {
return;
}
switch (elementType.intValue()) {
case COLLECTION_ID:
break;
case RECORD_ID:
record = factory.newRecord();
break;
case LEADER_ID:
sb = new StringBuffer();
break;
case CONTROLFIELD_ID:
sb = new StringBuffer();
tag = atts.getValue(TAG_ATTR);
controlField = factory.newControlField(tag);
break;
case DATAFIELD_ID:
tag = atts.getValue(TAG_ATTR);
String ind1 = atts.getValue(IND_1_ATTR);
String ind2 = atts.getValue(IND_2_ATTR);
if (ind1 == null) {
throw new MarcException("missing ind1");
}
if (ind2 == null) {
throw new MarcException("missing ind2");
}
if (ind1.length() == 0) {
ind1 = " ";
}
if (ind2.length() == 0) {
ind2 = " ";
}
dataField =
factory.newDataField(tag, ind1.charAt(0), ind2
.charAt(0));
break;
case SUBFIELD_ID:
sb = new StringBuffer();
String code = atts.getValue(CODE_ATTR);
if (code == null || code.length() == 0) {
code = " "; // throw new
// MarcException("missing subfield 'code' attribute");
}
subfield = factory.newSubfield(code.charAt(0));
}
}
/**
* An event fired as characters are consumed.
*
* @param ch
* @param start
* @param length
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
if (sb != null) {
sb.append(ch, start, length);
}
}
/**
* An event fired at the end of an element.
*
* @param uri
* @param name
* @param qName
*/
public void endElement(String uri, String name, String qName)
throws SAXException {
String realname = (name.length() == 0) ? qName : name;
Integer elementType = (Integer) elementMap.get(realname);
if (elementType == null) {
return;
}
switch (elementType.intValue()) {
case COLLECTION_ID:
break;
case RECORD_ID:
queue.push(record);
break;
case LEADER_ID:
Leader leader = factory.newLeader(sb.toString());
record.setLeader(leader);
break;
case CONTROLFIELD_ID:
controlField.setData(sb.toString());
record.addVariableField(controlField);
break;
case DATAFIELD_ID:
record.addVariableField(dataField);
break;
case SUBFIELD_ID:
subfield.setData(sb.toString());
dataField.addSubfield(subfield);
}
}
/**
* An event fired at the end of the document.
*/
public void endDocument() throws SAXException {
queue.end();
}
/**
* An event fired while consuming ignorable whitespace.
*
* @param data
* @param offset
* @param length
* @throws SAXException
*/
public void ignorableWhitespace(char[] data, int offset, int length)
throws SAXException {
// not implemented
}
/**
* An event fired at the end of prefix mapping.
*
* @param prefix
* @throws SAXException
*/
public void endPrefixMapping(String prefix) throws SAXException {
}
/**
* An event fired while consuming a skipped entity.
*
* @param name
* @throws SAXException
*/
public void skippedEntity(String name) throws SAXException {
// not implemented
}
/**
* An event fired while consuming a document locator.
*
* @param locator
*/
public void setDocumentLocator(Locator locator) {
// not implemented
}
/**
* An event fired while consuming a processing instruction.
*
* @param target
* @param data
* @throws SAXException
*/
public void processingInstruction(String target, String data)
throws SAXException {
// not implemented
}
/**
* An event fired at the start of prefix mapping.
*
* @param prefix
* @param uri
*/
public void startPrefixMapping(String prefix, String uri)
throws SAXException {
// not implemented
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy