/**
* Utility method for pattern-matching metadata elements. This method will return <code>true
* </code> if the given schema, element, qualifier and language match the schema, element,
* qualifier and language of the <code>DCValue</code> object passed in. Any or all of the element,
* qualifier and language passed in can be the <code>Item.ANY</code> wildcard.
*
* @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 to match, or <code>Item.ANY</code>
* @param qualifier the qualifier to match, or <code>Item.ANY</code>
* @param language the language to match, or <code>Item.ANY</code>
* @param metadataValue the Dublin Core value
* @return <code>true</code> if there is a match
*/
protected boolean match(
String schema,
String element,
String qualifier,
String language,
MetadataValue metadataValue) {
MetadataField metadataField = metadataValue.getMetadataField();
MetadataSchema metadataSchema = metadataField.getMetadataSchema();
// We will attempt to disprove a match - if we can't we have a match
if (!element.equals(Item.ANY) && !element.equals(metadataField.getElement())) {
// Elements do not match, no wildcard
return false;
}
if (qualifier == null) {
// Value must be unqualified
if (metadataField.getQualifier() != null) {
// Value is qualified, so no match
return false;
}
} else if (!qualifier.equals(Item.ANY)) {
// Not a wildcard, so qualifier must match exactly
if (!qualifier.equals(metadataField.getQualifier())) {
return false;
}
}
if (language == null) {
// Value must be null language to match
if (metadataValue.getLanguage() != null) {
// Value is qualified, so no match
return false;
}
} else if (!language.equals(Item.ANY)) {
// Not a wildcard, so language must match exactly
if (!language.equals(metadataValue.getLanguage())) {
return false;
}
}
if (!schema.equals(Item.ANY)) {
if (metadataSchema != null && !metadataSchema.getName().equals(schema)) {
// The namespace doesn't match
return false;
}
}
// If we get this far, we have a match
return true;
}
@Override
public void update(Context context, T dso) throws SQLException, AuthorizeException {
if (dso.isMetadataModified()) {
/*
Update the order of the metadata values
*/
// A map created to store the latest place for each metadata field
Map<MetadataField, Integer> fieldToLastPlace = new HashMap<>();
List<MetadataValue> metadataValues = dso.getMetadata();
for (MetadataValue metadataValue : metadataValues) {
// Retrieve & store the place for each metadata value
int mvPlace = getMetadataValuePlace(fieldToLastPlace, metadataValue);
metadataValue.setPlace(mvPlace);
}
}
}
@Override
public void clearMetadata(
Context context, T dso, String schema, String element, String qualifier, String lang)
throws SQLException {
// We will build a list of values NOT matching the values to clear
Iterator<MetadataValue> metadata = dso.getMetadata().iterator();
while (metadata.hasNext()) {
MetadataValue metadataValue = metadata.next();
if (match(schema, element, qualifier, lang, metadataValue)) {
metadataValue.setDSpaceObject(null);
metadata.remove();
// metadataValueService.delete(context, metadataValue);
}
}
dso.setMetadataModified();
}
@Override
public List<MetadataValue> getMetadata(
T dso, String schema, String element, String qualifier, String lang, String authority) {
List<MetadataValue> metadata = getMetadata(dso, schema, element, qualifier, lang);
List<MetadataValue> result = new ArrayList<>(metadata);
if (!authority.equals(Item.ANY)) {
Iterator<MetadataValue> iterator = result.iterator();
while (iterator.hasNext()) {
MetadataValue metadataValue = iterator.next();
if (!authority.equals(metadataValue.getAuthority())) {
iterator.remove();
}
}
}
return result;
}
/**
* Retrieve the place of the metadata value
*
* @param fieldToLastPlace the map containing the latest place of each metadata field
* @param metadataValue the metadata value that needs to get a place
* @return The new place for the metadata valu
*/
protected int getMetadataValuePlace(
Map<MetadataField, Integer> fieldToLastPlace, MetadataValue metadataValue) {
MetadataField metadataField = metadataValue.getMetadataField();
if (fieldToLastPlace.containsKey(metadataField)) {
fieldToLastPlace.put(metadataField, fieldToLastPlace.get(metadataField) + 1);
} else {
// The metadata value place starts at 0
fieldToLastPlace.put(metadataField, 0);
}
return fieldToLastPlace.get(metadataField);
}
@Override
public void addMetadata(
Context context,
T dso,
MetadataField metadataField,
String lang,
List<String> values,
List<String> authorities,
List<Integer> confidences)
throws SQLException {
boolean authorityControlled = metadataAuthorityService.isAuthorityControlled(metadataField);
boolean authorityRequired = metadataAuthorityService.isAuthorityRequired(metadataField);
// We will not verify that they are valid entries in the registry
// until update() is called.
for (int i = 0; i < values.size(); i++) {
MetadataValue metadataValue = metadataValueService.create(context, dso, metadataField);
metadataValue.setLanguage(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.get(i) != null && authorities.get(i).length() > 0) {
metadataValue.setAuthority(authorities.get(i));
metadataValue.setConfidence(
confidences == null ? Choices.CF_NOVALUE : confidences.get(i));
} else {
metadataValue.setAuthority(null);
metadataValue.setConfidence(confidences == null ? Choices.CF_UNSET : confidences.get(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
&& (metadataValue.getAuthority() == null
|| metadataValue.getAuthority().length() == 0)) {
throw new IllegalArgumentException(
"The metadata field \""
+ metadataField.toString()
+ "\" requires an authority key but none was provided. Value=\""
+ values.get(i)
+ "\"");
}
}
if (values.get(i) != null) {
// remove control unicode char
String temp = values.get(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] = ' ';
}
}
metadataValue.setValue(String.valueOf(dcvalue));
;
} else {
metadataValue.setValue(null);
}
// An update here isn't needed, this is persited upon the merge of the owning object
// metadataValueService.update(context, metadataValue);
dso.addDetails(metadataField.toString());
}
}
public void updateMetadata() throws SQLException, AuthorizeException {
// Map counting number of values for each element/qualifier.
// Keys are Strings: "element" or "element.qualifier"
// Values are Integers indicating number of values written for a
// element/qualifier
Map<String, Integer> elementCount = new HashMap<String, Integer>();
modifiedMetadata = false;
// Arrays to store the working information required
int[] placeNum = new int[getMetadata().size()];
boolean[] storedDC = new boolean[getMetadata().size()];
MetadataField[] dcFields = new MetadataField[getMetadata().size()];
// Work out the place numbers for the in memory DC
for (int dcIdx = 0; dcIdx < getMetadata().size(); dcIdx++) {
DCValue dcv = getMetadata().get(dcIdx);
// Work out the place number for ordering
int current = 0;
// Key into map is "element" or "element.qualifier"
String key = dcv.element + ((dcv.qualifier == null) ? "" : ("." + dcv.qualifier));
Integer currentInteger = elementCount.get(key);
if (currentInteger != null) {
current = currentInteger.intValue();
}
current++;
elementCount.put(key, Integer.valueOf(current));
// Store the calculated place number, reset the stored flag, and cache the metadatafield
placeNum[dcIdx] = current;
storedDC[dcIdx] = false;
dcFields[dcIdx] = getMetadataField(dcv);
if (dcFields[dcIdx] == null) {
// Bad DC field, log and throw exception
log.warn("Invalid metadata field: [" + dcv.getField() + "] : [" + dcv.value + "]");
throw new SQLException("Invalid metadata field: [" + dcv.getField() + "]");
}
}
// Now the precalculations are done, iterate through the existing metadata
// looking for matches
TableRowIterator tri = retrieveMetadata();
if (tri != null) {
try {
while (tri.hasNext()) {
TableRow tr = tri.next();
// Assume that we will remove this row, unless we get a match
boolean removeRow = true;
// Go through the in-memory metadata, unless we've already decided to keep this row
for (int dcIdx = 0; dcIdx < getMetadata().size() && removeRow; dcIdx++) {
// Only process if this metadata has not already been matched to something in the DB
if (!storedDC[dcIdx]) {
boolean matched = true;
DCValue dcv = getMetadata().get(dcIdx);
// Check the metadata field is the same
if (matched && dcFields[dcIdx].getFieldID() != tr.getIntColumn("metadata_field_id")) {
matched = false;
}
// Check the place is the same
if (matched && placeNum[dcIdx] != tr.getIntColumn("place")) {
matched = false;
}
// Check the text is the same
if (matched) {
String text = tr.getStringColumn("text_value");
if (dcv.value == null && text == null) {
matched = true;
} else if (dcv.value != null && dcv.value.equals(text)) {
matched = true;
} else {
matched = false;
}
}
// Check the language is the same
if (matched) {
String lang = tr.getStringColumn("text_lang");
if (dcv.language == null && lang == null) {
matched = true;
} else if (dcv.language != null && dcv.language.equals(lang)) {
matched = true;
} else {
matched = false;
}
}
// check that authority and confidence match
if (matched) {
String auth = tr.getStringColumn("authority");
int conf = tr.getIntColumn("confidence");
if (!((dcv.authority == null && auth == null)
|| (dcv.authority != null && auth != null && dcv.authority.equals(auth))
&& dcv.confidence == conf)) {
matched = false;
}
}
// If the db record is identical to the in memory values
if (matched) {
// Flag that the metadata is already in the DB
storedDC[dcIdx] = true;
// Flag that we are not going to remove the row
removeRow = false;
}
}
}
// If after processing all the metadata values, we didn't find a match
// delete this row from the DB
if (removeRow) {
DatabaseManager.delete(ourContext, tr);
modifiedMetadata = true;
}
}
} finally {
tri.close();
}
}
// Add missing in-memory DC
for (int dcIdx = 0; dcIdx < getMetadata().size(); dcIdx++) {
// Only write values that are not already in the db
if (!storedDC[dcIdx]) {
DCValue dcv = getMetadata().get(dcIdx);
// Write DCValue
MetadataValue metadata = new MetadataValue();
metadata.setResourceId(getID());
metadata.setResourceTypeId(getType());
metadata.setFieldId(dcFields[dcIdx].getFieldID());
metadata.setValue(dcv.value);
metadata.setLanguage(dcv.language);
metadata.setPlace(placeNum[dcIdx]);
metadata.setAuthority(dcv.authority);
metadata.setConfidence(dcv.confidence);
metadata.create(ourContext);
modifiedMetadata = true;
}
}
if (modifiedMetadata) {
ourContext.addEvent(
new Event(
Event.MODIFY_METADATA, getType(), getID(), getDetails(), getIdentifiers(ourContext)));
modifiedMetadata = false;
}
}
