List<DCValue> get(Context c, int resourceId, int resourceTypeId, Logger log)
throws SQLException {
if (metadata == null) {
metadata = new ArrayList<DCValue>();
// Get Dublin Core metadata
TableRowIterator tri = retrieveMetadata(resourceId, resourceTypeId);
if (tri != null) {
try {
while (tri.hasNext()) {
TableRow resultRow = tri.next();
// Get the associated metadata field and schema information
int fieldID = resultRow.getIntColumn("metadata_field_id");
MetadataField field = MetadataField.find(c, fieldID);
if (field == null) {
log.error("Loading item - cannot find metadata field " + fieldID);
} else {
MetadataSchema schema = MetadataSchema.find(c, field.getSchemaID());
if (schema == null) {
log.error(
"Loading item - cannot find metadata schema "
+ field.getSchemaID()
+ ", field "
+ fieldID);
} else {
// Make a DCValue object
DCValue dcv = new DCValue();
dcv.element = field.getElement();
dcv.qualifier = field.getQualifier();
dcv.value = resultRow.getStringColumn("text_value");
dcv.language = resultRow.getStringColumn("text_lang");
// dcv.namespace = schema.getNamespace();
dcv.schema = schema.getName();
dcv.authority = resultRow.getStringColumn("authority");
dcv.confidence = resultRow.getIntColumn("confidence");
// Add it to the list
metadata.add(dcv);
}
}
}
} finally {
// close the TableRowIterator to free up resources
if (tri != null) {
tri.close();
}
}
}
}
return metadata;
}
/**
* Get metadata for the DSpace Object in a chosen schema. See <code>MetadataSchema</code> for more
* information about schemas. Passing in a <code>null</code> value for <code>qualifier</code> or
* <code>lang</code> only matches metadata fields where that qualifier or languages is actually
* <code>null</code>. Passing in <code>DSpaceObject.ANY</code> retrieves all metadata fields with
* any value for the qualifier or language, including <code>null</code>
*
* <p>Examples:
*
* <p>Return values of the unqualified "title" field, in any language. Qualified title fields
* (e.g. "title.uniform") are NOT returned:
*
* <p><code>dspaceobject.getMetadataByMetadataString("dc", "title", null, DSpaceObject.ANY );
* </code>
*
* <p>Return all US English values of the "title" element, with any qualifier (including
* unqualified):
*
* <p><code>dspaceobject.getMetadataByMetadataString("dc, "title", DSpaceObject.ANY, "en_US" );
* </code>
*
* <p>The ordering of values of a particular element/qualifier/language combination is
* significant. When retrieving with wildcards, values of a particular element/qualifier/language
* combinations will be adjacent, but the overall ordering of the combinations is indeterminate.
*
* @param schema the schema for the metadata field. <em>Must</em> match the <code>name</code> of
* an existing metadata schema.
* @param element the element name. <code>DSpaceObject.ANY</code> matches any element. <code>null
* </code> doesn't really make sense as all metadata must have an element.
* @param qualifier the qualifier. <code>null</code> means unqualified, and <code>DSpaceObject.ANY
* </code> means any qualifier (including unqualified.)
* @param lang the ISO639 language code, optionally followed by an underscore and the ISO3166
* country code. <code>null</code> means only values with no language are returned, and <code>
* DSpaceObject.ANY</code> means values with any country code or no country code are returned.
* @return metadata fields that match the parameters
*/
public DCValue[] getMetadata(String schema, String element, String qualifier, String lang) {
// Build up list of matching values
List<DCValue> values = new ArrayList<DCValue>();
for (DCValue dcv : getMetadata()) {
if (match(schema, element, qualifier, lang, dcv)) {
// We will return a copy of the object in case it is altered
DCValue copy = new DCValue();
copy.element = dcv.element;
copy.qualifier = dcv.qualifier;
copy.value = dcv.value;
copy.language = dcv.language;
copy.schema = dcv.schema;
copy.authority = dcv.authority;
copy.confidence = dcv.confidence;
values.add(copy);
}
}
// Create an array of matching values
DCValue[] valueArray = new DCValue[values.size()];
valueArray = (DCValue[]) values.toArray(valueArray);
return valueArray;
}
/**
* Add metadata fields. These are appended to existing values. Use <code>clearDC</code> to remove
* values. The ordering of values passed in is maintained.
*
* @param schema the schema for the metadata field. <em>Must</em> match the <code>name</code> of
* an existing metadata schema.
* @param element the metadata element name
* @param qualifier the metadata qualifier name, or <code>null</code> for unqualified
* @param lang the ISO639 language code, optionally followed by an underscore and the ISO3166
* country code. <code>null</code> means the value has no language (for example, a date).
* @param values the values to add.
* @param authorities the external authority key for this value (or null)
* @param confidences the authority confidence (default 0)
*/
public void addMetadata(
String schema,
String element,
String qualifier,
String lang,
String[] values,
String authorities[],
int confidences[]) {
List<DCValue> dublinCore = getMetadata();
MetadataAuthorityManager mam = MetadataAuthorityManager.getManager();
boolean authorityControlled = mam.isAuthorityControlled(schema, element, qualifier);
boolean authorityRequired = mam.isAuthorityRequired(schema, element, qualifier);
String fieldName = schema + "." + element + ((qualifier == null) ? "" : "." + qualifier);
// We will not verify that they are valid entries in the registry
// until update() is called.
for (int i = 0; i < values.length; i++) {
DCValue dcv = new DCValue();
dcv.schema = schema;
dcv.element = element;
dcv.qualifier = qualifier;
dcv.language = (lang == null ? null : lang.trim());
// Logic to set Authority and Confidence:
// - normalize an empty string for authority to NULL.
// - if authority key is present, use given confidence or NOVALUE if not given
// - otherwise, preserve confidence if meaningful value was given since it may document a
// failed authority lookup
// - CF_UNSET signifies no authority nor meaningful confidence.
// - it's possible to have empty authority & CF_ACCEPTED if e.g. user deletes authority key
if (authorityControlled) {
if (authorities != null && authorities[i] != null && authorities[i].length() > 0) {
dcv.authority = authorities[i];
dcv.confidence = confidences == null ? Choices.CF_NOVALUE : confidences[i];
} else {
dcv.authority = null;
dcv.confidence = confidences == null ? Choices.CF_UNSET : confidences[i];
}
// authority sanity check: if authority is required, was it supplied?
// XXX FIXME? can't throw a "real" exception here without changing all the callers to expect
// it, so use a runtime exception
if (authorityRequired && (dcv.authority == null || dcv.authority.length() == 0)) {
throw new IllegalArgumentException(
"The metadata field \""
+ fieldName
+ "\" requires an authority key but none was provided. Vaue=\""
+ dcv.value
+ "\"");
}
}
if (values[i] != null) {
// remove control unicode char
String temp = values[i].trim();
char[] dcvalue = temp.toCharArray();
for (int charPos = 0; charPos < dcvalue.length; charPos++) {
if (Character.isISOControl(dcvalue[charPos])
&& !String.valueOf(dcvalue[charPos]).equals("\u0009")
&& !String.valueOf(dcvalue[charPos]).equals("\n")
&& !String.valueOf(dcvalue[charPos]).equals("\r")) {
dcvalue[charPos] = ' ';
}
}
dcv.value = String.valueOf(dcvalue);
} else {
dcv.value = null;
}
dublinCore.add(dcv);
addDetails(fieldName);
}
if (values.length > 0) {
modifiedMetadata = true;
}
}
