org.dspace.content.MetadataValue Maven / Gradle / Ivy
/**
* The contents of this file are subject to the license and copyright
* detailed in the LICENSE and NOTICE files at the root of the source
* tree and available online at
*
* http://www.dspace.org/license/
*/
package org.dspace.content;
import java.io.IOException;
import java.sql.SQLException;
import java.util.*;
import org.apache.log4j.Logger;
import org.dspace.authorize.AuthorizeException;
import org.dspace.core.Context;
import org.dspace.core.LogManager;
import org.dspace.storage.rdbms.DatabaseManager;
import org.dspace.storage.rdbms.TableRow;
import org.dspace.storage.rdbms.TableRowIterator;
/**
* Database access class representing a Dublin Core metadata value.
* It represents a value of a given MetadataField on an Item.
* (The Item can have many values of the same field.) It contains element, qualifier, value and language.
* the field (which names the schema, element, and qualifier), language,
* and a value.
*
* @author Martin Hald
* @see org.dspace.content.MetadataSchema
* @see org.dspace.content.MetadataField
*/
public class MetadataValue
{
/** The reference to the metadata field */
private int fieldId = 0;
/** The primary key for the metadata value */
private int valueId = 0;
/** The reference to the DSpace item */
private int itemId;
/** The value of the field */
public String value;
/** The language of the field, may be null */
public String language;
/** The position of the record. */
public int place = 1;
/** Authority key, if any */
public String authority = null;
/** Authority confidence value -- see Choices class for values */
public int confidence = 0;
/** log4j logger */
private static Logger log = Logger.getLogger(MetadataValue.class);
/** The row in the table representing this type */
private TableRow row;
/**
* Construct the metadata object from the matching database row.
*
* @param row database row to use for contents
*/
public MetadataValue(TableRow row)
{
if (row != null)
{
fieldId = row.getIntColumn("metadata_field_id");
valueId = row.getIntColumn("metadata_value_id");
itemId = row.getIntColumn("item_id");
value = row.getStringColumn("text_value");
language = row.getStringColumn("text_lang");
place = row.getIntColumn("place");
authority = row.getStringColumn("authority");
confidence = row.getIntColumn("confidence");
this.row = row;
}
}
/**
* Default constructor.
*/
public MetadataValue()
{
}
/**
* Constructor to create a value for a given field.
*
* @param field initial value for field
*/
public MetadataValue(MetadataField field)
{
this.fieldId = field.getFieldID();
}
/**
* Get the field ID the metadata value represents.
*
* @return metadata field ID
*/
public int getFieldId()
{
return fieldId;
}
/**
* Set the field ID that the metadata value represents.
*
* @param fieldId new field ID
*/
public void setFieldId(int fieldId)
{
this.fieldId = fieldId;
}
/**
* Get the item ID.
*
* @return item ID
*/
public int getItemId()
{
return itemId;
}
/**
* Set the item ID.
*
* @param itemId new item ID
*/
public void setItemId(int itemId)
{
this.itemId = itemId;
}
/**
* Get the language (e.g. "en").
*
* @return language
*/
public String getLanguage()
{
return language;
}
/**
* Set the language (e.g. "en").
*
* @param language new language
*/
public void setLanguage(String language)
{
this.language = language;
}
/**
* Get the place ordering.
*
* @return place ordering
*/
public int getPlace()
{
return place;
}
/**
* Set the place ordering.
*
* @param place new place (relative order in series of values)
*/
public void setPlace(int place)
{
this.place = place;
}
/**
* Get the value ID.
*
* @return value ID
*/
public int getValueId()
{
return valueId;
}
/**
* Get the metadata value.
*
* @return metadata value
*/
public String getValue()
{
return value;
}
/**
* Set the metadata value
*
* @param value new metadata value
*/
public void setValue(String value)
{
this.value = value;
}
/**
* Get the metadata authority
*
* @return metadata authority
*/
public String getAuthority ()
{
return authority ;
}
/**
* Set the metadata authority
*
* @param value new metadata authority
*/
public void setAuthority (String value)
{
this.authority = value;
}
/**
* Get the metadata confidence
*
* @return metadata confidence
*/
public int getConfidence()
{
return confidence;
}
/**
* Set the metadata confidence
*
* @param value new metadata confidence
*/
public void setConfidence(int value)
{
this.confidence = value;
}
/**
* Creates a new metadata value.
*
* @param context
* DSpace context object
* @throws SQLException
* @throws AuthorizeException
*/
public void create(Context context) throws SQLException, AuthorizeException
{
// Create a table row and update it with the values
row = DatabaseManager.row("MetadataValue");
row.setColumn("item_id", itemId);
row.setColumn("metadata_field_id", fieldId);
row.setColumn("text_value", value);
row.setColumn("text_lang", language);
row.setColumn("place", place);
row.setColumn("authority", authority);
row.setColumn("confidence", confidence);
DatabaseManager.insert(context, row);
// Remember the new row number
this.valueId = row.getIntColumn("metadata_value_id");
// log.info(LogManager.getHeader(context, "create_metadata_value",
// "metadata_value_id=" + valueId));
}
/**
* Retrieves the metadata value from the database.
*
* @param context dspace context
* @param valueId database key id of value
* @return recalled metadata value
* @throws IOException
* @throws SQLException
* @throws AuthorizeException
*/
public static MetadataValue find(Context context, int valueId)
throws IOException, SQLException, AuthorizeException
{
// Grab rows from DB
TableRowIterator tri = DatabaseManager.queryTable(context, "MetadataValue",
"SELECT * FROM MetadataValue where metadata_value_id= ? ",
valueId);
TableRow row = null;
try
{
if (tri.hasNext())
{
row = tri.next();
}
}
finally
{
// close the TableRowIterator to free up resources
if (tri != null)
{
tri.close();
}
}
if (row == null)
{
return null;
}
else
{
return new MetadataValue(row);
}
}
/**
* Retrieves the metadata values for a given field from the database.
*
* @param context dspace context
* @param fieldId field whose values to look for
* @return a collection of metadata values
* @throws IOException
* @throws SQLException
* @throws AuthorizeException
*/
public static List findByField(Context context, int fieldId)
throws IOException, SQLException, AuthorizeException
{
// Grab rows from DB
TableRowIterator tri = DatabaseManager.queryTable(context, "MetadataValue",
"SELECT * FROM MetadataValue WHERE metadata_field_id= ? ",
fieldId);
TableRow row = null;
List ret = new ArrayList();
try
{
while (tri.hasNext())
{
row = tri.next();
ret.add(new MetadataValue(row));
}
}
finally
{
// close the TableRowIterator to free up resources
if (tri != null)
{
tri.close();
}
}
return ret;
}
/**
* Update the metadata value in the database.
*
* @param context dspace context
* @throws SQLException
* @throws AuthorizeException
*/
public void update(Context context) throws SQLException, AuthorizeException
{
row.setColumn("item_id", itemId);
row.setColumn("metadata_field_id", fieldId);
row.setColumn("text_value", value);
row.setColumn("text_lang", language);
row.setColumn("place", place);
row.setColumn("authority", authority);
row.setColumn("confidence", confidence);
DatabaseManager.update(context, row);
log.info(LogManager.getHeader(context, "update_metadatavalue",
"metadata_value_id=" + getValueId()));
}
/**
* Delete the metadata field.
*
* @param context dspace context
* @throws SQLException
* @throws AuthorizeException
*/
public void delete(Context context) throws SQLException, AuthorizeException
{
log.info(LogManager.getHeader(context, "delete_metadata_value",
" metadata_value_id=" + getValueId()));
DatabaseManager.delete(context, row);
}
/**
* Return true if other is the same MetadataValue
* as this object, false otherwise
*
* @param obj
* object to compare to
*
* @return true if object passed in represents the same
* MetadataValue as this object
*/
@Override
public boolean equals(Object obj)
{
if (obj == null)
{
return false;
}
if (getClass() != obj.getClass())
{
return false;
}
final MetadataValue other = (MetadataValue) obj;
if (this.fieldId != other.fieldId)
{
return false;
}
if (this.valueId != other.valueId)
{
return false;
}
if (this.itemId != other.itemId)
{
return false;
}
return true;
}
@Override
public int hashCode()
{
int hash = 7;
hash = 47 * hash + this.fieldId;
hash = 47 * hash + this.valueId;
hash = 47 * hash + this.itemId;
return hash;
}
}
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