PDFBOX-6121: avoid ClassCastExeption, as suggested by ChatGPT

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1930483 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

xmpbox/src/main/java/org/apache/xmpbox/schema/DublinCoreSchema.java

@@ -25,6 +25,7 @@
 import java.util.List;
 
 import org.apache.xmpbox.XMPMetadata;
+import org.apache.xmpbox.type.AbstractField;
 import org.apache.xmpbox.type.ArrayProperty;
 import org.apache.xmpbox.type.BadFieldValueException;
 import org.apache.xmpbox.type.Cardinality;
@@ -403,7 +404,7 @@ public void addType(String type)
      */
     public ArrayProperty getContributorsProperty()
     {
-        return (ArrayProperty) getProperty(CONTRIBUTOR);
+        return getPropertyAs(CONTRIBUTOR, ArrayProperty.class);
     }
 
     /**
@@ -424,7 +425,7 @@ public List<String> getContributors()
      */
     public TextType getCoverageProperty()
     {
-        return (TextType) getProperty(COVERAGE);
+        return getPropertyAs(COVERAGE, TextType.class);
     }
 
     /**
@@ -434,7 +435,7 @@ public TextType getCoverageProperty()
      */
     public String getCoverage()
     {
-        TextType tt = (TextType) getProperty(COVERAGE);
+        TextType tt = getPropertyAs(COVERAGE, TextType.class);
         return tt == null ? null : tt.getStringValue();
     }
 
@@ -445,7 +446,7 @@ public String getCoverage()
      */
     public ArrayProperty getCreatorsProperty()
     {
-        return (ArrayProperty) getProperty(CREATOR);
+        return getPropertyAs(CREATOR, ArrayProperty.class);
     }
 
     /**
@@ -465,7 +466,7 @@ public List<String> getCreators()
      */
     public ArrayProperty getDatesProperty()
     {
-        return (ArrayProperty) getProperty(DATE);
+        return getPropertyAs(DATE, ArrayProperty.class);
     }
 
     /**
@@ -485,7 +486,7 @@ public List<Calendar> getDates()
      */
     public ArrayProperty getDescriptionProperty()
     {
-        return (ArrayProperty) getProperty(DESCRIPTION);
+        return getPropertyAs(DESCRIPTION, ArrayProperty.class);
     }
 
     /**
@@ -531,7 +532,7 @@ public String getDescription() throws BadFieldValueException
      */
     public TextType getFormatProperty()
     {
-        return (TextType) getProperty(FORMAT);
+        return getPropertyAs(FORMAT, TextType.class);
     }
 
     /**
@@ -541,7 +542,7 @@ public TextType getFormatProperty()
      */
     public String getFormat()
     {
-        TextType tt = (TextType) getProperty(FORMAT);
+        TextType tt = getPropertyAs(FORMAT, TextType.class);
         return tt == null ? null : tt.getStringValue();
     }
 
@@ -552,7 +553,7 @@ public String getFormat()
      */
     public TextType getIdentifierProperty()
     {
-        return (TextType) getProperty(IDENTIFIER);
+        return getPropertyAs(IDENTIFIER, TextType.class);
     }
 
     /**
@@ -562,7 +563,7 @@ public TextType getIdentifierProperty()
      */
     public String getIdentifier()
     {
-        TextType tt = (TextType) getProperty(IDENTIFIER);
+        TextType tt = getPropertyAs(IDENTIFIER, TextType.class);
         return tt == null ? null : tt.getStringValue();
     }
 
@@ -573,7 +574,7 @@ public String getIdentifier()
      */
     public ArrayProperty getLanguagesProperty()
     {
-        return (ArrayProperty) getProperty(LANGUAGE);
+        return getPropertyAs(LANGUAGE, ArrayProperty.class);
     }
 
     /**
@@ -593,7 +594,7 @@ public List<String> getLanguages()
      */
     public ArrayProperty getPublishersProperty()
     {
-        return (ArrayProperty) getProperty(PUBLISHER);
+        return getPropertyAs(PUBLISHER, ArrayProperty.class);
     }
 
     /**
@@ -613,7 +614,7 @@ public List<String> getPublishers()
      */
     public ArrayProperty getRelationsProperty()
     {
-        return (ArrayProperty) getProperty(RELATION);
+        return getPropertyAs(RELATION, ArrayProperty.class);
     }
 
     /**
@@ -633,7 +634,7 @@ public List<String> getRelations()
      */
     public ArrayProperty getRightsProperty()
     {
-        return (ArrayProperty) getProperty(RIGHTS);
+        return getPropertyAs(RIGHTS, ArrayProperty.class);
     }
 
     /**
@@ -678,7 +679,7 @@ public String getRights() throws BadFieldValueException
      */
     public TextType getSourceProperty()
     {
-        return (TextType) getProperty(SOURCE);
+        return getPropertyAs(SOURCE, TextType.class);
     }
 
     /**
@@ -688,7 +689,7 @@ public TextType getSourceProperty()
      */
     public String getSource()
     {
-        TextType tt = (TextType) getProperty(SOURCE);
+        TextType tt = getPropertyAs(SOURCE, TextType.class);
         return tt == null ? null : tt.getStringValue();
     }
 
@@ -699,7 +700,7 @@ public String getSource()
      */
     public ArrayProperty getSubjectsProperty()
     {
-        return (ArrayProperty) getProperty(SUBJECT);
+        return getPropertyAs(SUBJECT, ArrayProperty.class);
     }
 
     /**
@@ -719,7 +720,7 @@ public List<String> getSubjects()
      */
     public ArrayProperty getTitleProperty()
     {
-        return (ArrayProperty) getProperty(TITLE);
+        return getPropertyAs(TITLE, ArrayProperty.class);
     }
 
     /**
@@ -763,7 +764,7 @@ public String getTitle() throws BadFieldValueException
      */
     public ArrayProperty getTypesProperty()
     {
-        return (ArrayProperty) getProperty(TYPE);
+        return getPropertyAs(TYPE, ArrayProperty.class);
     }
 
     /**
@@ -781,4 +782,9 @@ public void removeType(String type)
         removeUnqualifiedBagValue(TYPE, type);
     }
 
+    private <T> T getPropertyAs(String name, Class<T> type)
+    {
+        AbstractField property = getProperty(name);
+        return type.isInstance(property) ? type.cast(property) : null;
+    }
 }