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Add an xmp_elements key to the delegate script context
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Alex Dolski
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Mar 11, 2022
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148 changes: 148 additions & 0 deletions
148
src/main/java/edu/illinois/library/cantaloupe/image/xmp/MapReader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| package edu.illinois.library.cantaloupe.image.xmp; | ||
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| import org.apache.jena.rdf.model.Model; | ||
| import org.apache.jena.rdf.model.ModelFactory; | ||
| import org.apache.jena.rdf.model.RDFNode; | ||
| import org.apache.jena.rdf.model.Statement; | ||
| import org.apache.jena.rdf.model.StmtIterator; | ||
| import org.apache.jena.riot.RIOT; | ||
| import org.apache.jena.riot.RiotException; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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|
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| import java.io.IOException; | ||
| import java.io.StringReader; | ||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.TreeMap; | ||
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| /** | ||
| * Extracts label-value pairs from an XMP model, making them available in a | ||
| * {@link Map}. | ||
| * | ||
| * @author Alex Dolski UIUC | ||
| * @since 6.0 | ||
| */ | ||
| public final class MapReader { | ||
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| private static final Logger LOGGER = | ||
| LoggerFactory.getLogger(MapReader.class); | ||
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| private static final Map<String,String> PREFIXES = Map.ofEntries( | ||
| Map.entry("http://ns.adobe.com/camera-raw-settings/1.0/", "crs"), | ||
| Map.entry("http://purl.org/dc/elements/1.1/", "dc"), | ||
| Map.entry("http://purl.org/dc/terms/", "dcterms"), | ||
| Map.entry("http://ns.adobe.com/exif/1.0/", "exif"), | ||
| Map.entry("http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/", "Iptc4xmpCore"), | ||
| Map.entry("http://ns.adobe.com/iX/1.0/", "iX"), | ||
| Map.entry("http://ns.adobe.com/pdf/1.3/", "pdf"), | ||
| Map.entry("http://ns.adobe.com/photoshop/1.0/", "photoshop"), | ||
| Map.entry("http://ns.adobe.com/tiff/1.0/", "tiff"), | ||
| Map.entry("http://ns.adobe.com/xap/1.0/", "xmp"), | ||
| Map.entry("http://ns.adobe.com/xap/1.0/bj/", "xmpBJ"), | ||
| Map.entry("http://ns.adobe.com/xmp/1.0/DynamicMedia/", "xmpDM"), | ||
| Map.entry("http://ns.adobe.com/xmp/identifier/qual/1.0/", "xmpidq"), | ||
| Map.entry("http://ns.adobe.com/xap/1.0/mm/", "xmpMM"), | ||
| Map.entry("http://ns.adobe.com/xap/1.0/rights/", "xmpRights"), | ||
| Map.entry("http://ns.adobe.com/xap/1.0/t/pg/", "xmpTPg")); | ||
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| private final Model model; | ||
| private final Map<String,Object> elements = new TreeMap<>(); | ||
| private boolean hasReadElements; | ||
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| /** | ||
| * @param xmp XMP string. {@code <rdf:RDF>} must be the root element. | ||
| * @see edu.illinois.library.cantaloupe.util.StringUtils#trimXMP | ||
| */ | ||
| public MapReader(String xmp) throws IOException { | ||
| RIOT.init(); | ||
| this.model = ModelFactory.createDefaultModel(); | ||
| try (StringReader reader = new StringReader(xmp)) { | ||
| model.read(reader, null, "RDF/XML"); | ||
| } catch (RiotException | NullPointerException e) { | ||
| // The XMP string may be invalid RDF/XML, or there may be a bug | ||
| // in Jena (that would be the NPE). Not much we can do. | ||
| throw new IOException(e); | ||
| } | ||
| } | ||
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| /** | ||
| * @param model XMP model, already initialized. | ||
| */ | ||
| public MapReader(Model model) { | ||
| this.model = model; | ||
| } | ||
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| public Map<String,Object> readElements() throws IOException { | ||
| if (!hasReadElements) { | ||
| StmtIterator it = model.listStatements(); | ||
| while (it.hasNext()) { | ||
| Statement stmt = it.next(); | ||
| //System.out.println(stmt.getSubject() + " " + stmt.getSubject().isAnon()); | ||
| //System.out.println(" " + stmt.getPredicate()); | ||
| //System.out.println(" " + stmt.getObject() + " " + stmt.getObject().isLiteral()); | ||
| //System.out.println("---------------------------"); | ||
| if (!stmt.getSubject().isAnon()) { | ||
| recurse(stmt); | ||
| } | ||
| } | ||
| LOGGER.trace("readElements(): read {} elements", elements.size()); | ||
| hasReadElements = true; | ||
| } | ||
| return Collections.unmodifiableMap(elements); | ||
| } | ||
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| private void recurse(Statement stmt) { | ||
| recurse(stmt, null); | ||
| } | ||
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| private void recurse(Statement stmt, String predicateOverride) { | ||
| String predicate = stmt.getPredicate().toString(); | ||
| if (stmt.getObject().isLiteral()) { | ||
| addElement(label(predicateOverride != null ? predicateOverride : predicate), | ||
| stmt.getObject().asLiteral().getValue()); | ||
| } else { | ||
| StmtIterator it = model.listStatements( | ||
| stmt.getObject().asResource(), null, (RDFNode) null); | ||
| while (it.hasNext()) { | ||
| Statement substmt = it.next(); | ||
| predicateOverride = null; | ||
| if (substmt.getPredicate().toString().matches("(.*)#_\\d+\\b")) { | ||
| predicateOverride = predicate; | ||
| } | ||
| recurse(substmt, predicateOverride); | ||
| } | ||
| } | ||
| } | ||
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| private void addElement(String label, Object value) { | ||
| if (elements.containsKey(label)) { | ||
| if (elements.get(label) instanceof List) { | ||
| @SuppressWarnings("unchecked") | ||
| List<Object> valueList = (List<Object>) elements.get(label); | ||
| valueList.add(value); | ||
| } else { | ||
| List<Object> valueList = new ArrayList<>(); | ||
| valueList.add(elements.get(label)); | ||
| valueList.add(value); | ||
| elements.put(label, valueList); | ||
| } | ||
| } else { | ||
| elements.put(label, value); | ||
| } | ||
| } | ||
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| private String label(String uri) { | ||
| for (Map.Entry<String,String> entry : PREFIXES.entrySet()) { | ||
| if (uri.startsWith(entry.getKey())) { | ||
| String prefix = entry.getValue(); | ||
| String[] parts = uri.split("/"); | ||
| return prefix + ":" + parts[parts.length - 1]; | ||
| } | ||
| } | ||
| return uri; | ||
| } | ||
|
|
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| } |
6 changes: 6 additions & 0 deletions
6
src/main/java/edu/illinois/library/cantaloupe/image/xmp/package-info.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| /** | ||
| * <p>Contains an XMP parser.</p> | ||
| * | ||
| * @since 6.0 | ||
| */ | ||
| package edu.illinois.library.cantaloupe.image.xmp; |
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