X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.export.core%2Fsrc%2Forg%2Fsimantics%2Fexport%2Fcore%2Futil%2FExporterUtils.java;h=fd5a0a6a92289657d6c94c623756a01a1aa3476f;hb=refs%2Fchanges%2F38%2F238%2F2;hp=346c1e79e048cd47c073fa13cb34b3bdf315873e;hpb=969bd23cab98a79ca9101af33334000879fb60c5;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.export.core/src/org/simantics/export/core/util/ExporterUtils.java b/bundles/org.simantics.export.core/src/org/simantics/export/core/util/ExporterUtils.java
index 346c1e79e..fd5a0a6a9 100644
--- a/bundles/org.simantics.export.core/src/org/simantics/export/core/util/ExporterUtils.java
+++ b/bundles/org.simantics.export.core/src/org/simantics/export/core/util/ExporterUtils.java
@@ -1,401 +1,401 @@
-package org.simantics.export.core.util;
-
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
-
-import org.osgi.service.prefs.BackingStoreException;
-import org.osgi.service.prefs.Preferences;
-import org.simantics.databoard.Accessors;
-import org.simantics.databoard.Bindings;
-import org.simantics.databoard.accessor.Accessor;
-import org.simantics.databoard.accessor.RecordAccessor;
-import org.simantics.databoard.accessor.UnionAccessor;
-import org.simantics.databoard.accessor.error.AccessorConstructionException;
-import org.simantics.databoard.accessor.error.AccessorException;
-import org.simantics.databoard.accessor.error.ReferenceException;
-import org.simantics.databoard.accessor.reference.ChildReference;
-import org.simantics.databoard.accessor.reference.LabelReference;
-import org.simantics.databoard.binding.Binding;
-import org.simantics.databoard.binding.error.BindingException;
-import org.simantics.databoard.binding.mutable.Variant;
-import org.simantics.databoard.type.Component;
-import org.simantics.databoard.type.UnionType;
-import org.simantics.export.core.ExportContext;
-import org.simantics.export.core.ExportExtensionPoint;
-import org.simantics.export.core.error.ExportException;
-import org.simantics.export.core.intf.Exporter;
-import org.simantics.export.core.intf.Publisher;
-import org.simantics.export.core.manager.Content;
-import org.simantics.utils.datastructures.MapList;
-import org.simantics.utils.strings.AlphanumComparator;
-
-public class ExporterUtils {
-
-	/**
-	 * Gets publisher location options from options variant.
-	 * 
-	 * @param ctx
-	 * @param publisherId
-	 * @param options
-	 * @return publisher options or null
-	 * @throws ExportException
-	 */
-	public static Variant getPublisherLocationOptions(ExportContext ctx, String publisherId, Variant options) throws ExportException {
-		try {			
-			Publisher publisher = ctx.eep.getPublisher(publisherId);
-			Variant locationOptions = options.getComponent( new LabelReference( publisher.label() ) );
-			return locationOptions;
-		} catch (AccessorConstructionException e) {
-			throw new ExportException( e ); 
-		}
-	}
-	
-	/**
-	 * Checks if key exists in a preference node
-	 * 
-	 * @param pref
-	 * @param key
-	 * @return true if key exists
-	 */
-	public static boolean containsKey(Preferences pref, String key) {
-		try {
-			for (String x : pref.keys()) if ( x.equals(key) ) return true;
-		} catch (BackingStoreException e) {
-			e.printStackTrace();
-		} 
-		return false;		
-	}
-	
-	/**
-	 * Get value of a key, in a preference node.
-	 * 
-	 * @param pref (optional)
-	 * @param key key
-	 * @return if pref and value exists, the value.
-	 */
-	public static String getPrefString(Preferences pref, String key) {
-		if ( pref == null ) return null;
-		if ( !containsKey(pref, key) ) return null;
-		return pref.get(key, null);
-	}
-
-	/**
-	 * Get value first from pref1, then pref2
-	 * @param pref1 (optional) pririty preference node
-	 * @param pref2 (optional) 2nd priority node
-	 * @param key 
-	 * @return possible value
-	 */
-	public static String getPrefString(Preferences pref1, Preferences pref2, String key) {
-		if ( pref1 != null && containsKey(pref1, key) ) return pref1.get(key, null);
-		if ( pref2 != null && containsKey(pref2, key) ) return pref2.get(key, null);
-		return null;
-	}
-
-	/**
-	 * Get value first from pref1, then pref2
-	 * @param pref1 (optional) pririty preference node
-	 * @param pref2 (optional) 2nd priority node
-	 * @param key 
-	 * @return possible value
-	 */
-	public static Integer getPrefInteger(Preferences pref1, Preferences pref2, String key) {
-		if ( pref1 != null && containsKey(pref1, key) ) return pref1.getInt(key, -1);
-		if ( pref2 != null && containsKey(pref2, key) ) return pref2.getInt(key, -1);
-		return null;
-	}
-
-	/**
-	 * Get value first from pref1, then pref2
-	 * @param pref1 (optional) pririty preference node
-	 * @param pref2 (optional) 2nd priority node
-	 * @param key 
-	 * @return possible value
-	 */
-	public static Boolean getPrefBoolean(Preferences pref1, Preferences pref2, String key) {
-		if ( pref1 != null && containsKey(pref1, key) ) return pref1.getBoolean(key, false);
-		if ( pref2 != null && containsKey(pref2, key) ) return pref2.getBoolean(key, false);
-		return null;
-	}
-	
-	/**
-	 * Get value first from pref1, then pref2
-	 * @param pref1 (optional) pririty preference node
-	 * @param pref2 (optional) 2nd priority node
-	 * @param key 
-	 * @return possible value
-	 */
-	public static Double getPrefDouble(Preferences pref1, Preferences pref2, String key) {
-		if ( pref1 != null && containsKey(pref1, key) ) return pref1.getDouble(key, 0.0);
-		if ( pref2 != null && containsKey(pref2, key) ) return pref2.getDouble(key, 0.0);
-		return null;
-	}
-	
-	public static void setPrefString(Preferences pref, String key, String value) {
-		if ( pref == null ) return;
-		if ( value == null ) {
-			pref.remove(key); 
-		} else {
-			pref.put(key, value);
-		}
-	}
-	
-	public static void setPrefInt(Preferences pref, String key, Integer value) {
-		if ( pref == null ) return;
-		if ( value == null ) {
-			pref.remove(key); 
-		} else {
-			pref.putInt(key, value);
-		}
-	}
-	
-	public static void setPrefdouble(Preferences pref, String key, Double value) {
-		if ( pref == null ) return;
-		if ( value == null ) {
-			pref.remove(key); 
-		} else {
-			pref.putDouble(key, value);
-		}
-	}
-
-	/**
-	 * Set enum or union value to an accessor, using the string name of the enum value.
-	 * If value doesn't exist, false is returned.
-	 * If tagName doesn't exist, false is returned.
-	 * 
-	 * @param ra accessor
-	 * @param ref child reference
-	 * @param tagName (optional) the tag name
-	 * @return true if value was set
-	 */
-	public static boolean setUnionValue(Accessor ra, ChildReference ref, String tagName) {
-		if ( tagName == null ) return false;
-    	try {        		
-    		UnionAccessor ua = ra.getComponent( ref );
-    		UnionType ut = ua.type();    		
-    		int tag = ut.getComponentIndex2( tagName );
-    		if ( tag<0 ) return false;
-    		Component c = ut.components[tag];
-    		Binding cb = Bindings.getMutableBinding(c.type);
-    		Object o = cb.createDefault();
-    		ua.setComponentValue( tag, cb, o);
-    		return true;
-    	} catch (ReferenceException re) {        	
-    		return false;
-    	} catch (AccessorConstructionException e) {
-    		e.printStackTrace();
-    		return false;
-		} catch (AccessorException e) {
-			e.printStackTrace();
-    		return false;
-		} catch (BindingException e) {
-			e.printStackTrace();
-    		return false;
-		}            					
-	}
-
-	/**
-	 * Set enum or union value to an accessor, using the string name of the enum value.
-	 * If value doesn't exist, false is returned.
-	 * If tagName doesn't exist, false is returned.
-	 * 
-	 * @param ra accessor
-	 * @param ref child reference
-	 * @param tag the tag number (applied only if >=0)
-	 * @return true if value was set
-	 */
-	public static boolean setUnionValue(Accessor ra, ChildReference ref, int tag) {
-		if ( tag<0 ) return false;
-    	try {        		
-    		UnionAccessor ua = ra.getComponent( ref );
-    		UnionType ut = ua.type();    		
-    		Component c = ut.components[tag];
-    		Binding cb = Bindings.getMutableBinding(c.type);
-    		Object o = cb.createDefault();
-    		ua.setComponentValue( tag, cb, o);
-    		return true;
-    	} catch (ReferenceException re) {        	
-    		return false;
-    	} catch (AccessorConstructionException e) {
-    		e.printStackTrace();
-    		return false;
-		} catch (AccessorException e) {
-			e.printStackTrace();
-    		return false;
-		} catch (BindingException e) {
-			e.printStackTrace();
-    		return false;
-		}            					
-	}
-	
-	
-	/**
-	 * Get union value as a String
-	 * 
-	 * @param ra
-	 * @param ref
-	 * @return the union value as string or null if error occured
-	 */
-	public static String getUnionValue(Accessor ra, ChildReference ref) {
-    	try {        		
-    		UnionAccessor ua = ra.getComponent( ref );
-    		UnionType ut = ua.type();
-    		int tag = ua.getTag();
-    		return ut.components[tag].name;
-    	} catch (ReferenceException re) {        	
-    		return null;
-    	} catch (AccessorConstructionException e) {
-    		e.printStackTrace();
-    		return null;
-		} catch (AccessorException e) {
-			e.printStackTrace();
-    		return null;
-		}            					
-		
-	}
-
-	/**
-	 * 
-	 * @param ra
-	 * @param ref
-	 * @return tag or -1
-	 */
-	public static int getUnionInt(Accessor ra, ChildReference ref) {
-    	try {        		
-    		UnionAccessor ua = ra.getComponent( ref );
-    		int tag = ua.getTag();
-    		return tag;
-    	} catch (ReferenceException re) {        	
-    		return -1;
-    	} catch (AccessorConstructionException e) {
-    		e.printStackTrace();
-    		return -1;
-		} catch (AccessorException e) {
-			e.printStackTrace();
-    		return -1;
-		}            					
-		
-	}
-	
-	/**
-	 * Read string value from an location
-	 * 
-	 * @param location
-	 * @param ref
-	 * @return the value or null, if did not exist
-	 */
-	public static String getString(Variant location, ChildReference ref) {
-		try {
-			RecordAccessor ra = Accessors.getAccessor(location);
-			return (String) ra.getValue( ref, Bindings.STRING );
-		} catch (AccessorConstructionException e) {
-			return null;
-		} catch (AccessorException e) {
-			return null;
-		}					
-	}
-	
-	public static Boolean getBoolean(Variant location, ChildReference ref) {
-		try {
-			RecordAccessor ra = Accessors.getAccessor(location);
-			return (Boolean) ra.getValue( ref, Bindings.BOOLEAN );
-		} catch (AccessorConstructionException e) {
-			return null;
-		} catch (AccessorException e) {
-			return null;
-		}					
-	}
-	
-	public static Comparator<Content> createExportPriorityComparator( final ExportExtensionPoint eep ) {
-		return new Comparator<Content>() {
-
-			@Override
-			public int compare(Content c1, Content c2) {
-				
-				int p1 = Integer.MAX_VALUE;
-				for (Exporter e : eep.getExporters(c1.formatId, c1.contentTypeId)) 
-					p1 = Math.min(p1, e.getExportPriority());
-				
-				int p2 = Integer.MAX_VALUE;
-				for (Exporter e : eep.getExporters(c2.formatId, c2.contentTypeId)) 
-					p2 = Math.min(p2, e.getExportPriority());
-				
-				return Integer.signum( p1 - p2 );
-			}
-			
-		};		
-	}
-	
-	/**
-	 * Takes a maplist of contents as input and filters out all that matches
-	 * to the given uri.  
-	 * 
-	 * @param map
-	 * @param contentUri
-	 * @return map with contents of given Uri.
-	 */
-	public static MapList<Content, Content> filterByUri(MapList<Content, Content> map, String contentUri) {
-		if ( map == null ) return null;
-		MapList<Content, Content> result = new MapList<Content, Content>();
-		for ( Content key : map.getKeys() ) {						
-			if ( key.url.equals(contentUri) ) {
-				result.addAll(key, map.getValuesUnsafe(key));
-			}
-		}
-		return result;
-	}
-	
-	public static MapList<String, Content> toStringMap(MapList<Content, Content> map) {
-		if ( map == null ) return null;
-		MapList<String, Content> result = new MapList<String, Content>();
-		for ( Content key : map.getKeys() ) {
-			result.addAll(key.url, map.getValuesUnsafe(key));
-		}		
-		return result;
-	}
-	
-	public static List<Content> filterContents(Collection<Content> contents, String contentTypeId, String formatId) {
-		if ( contents==null ) return null;
-		List<Content> result = new ArrayList<Content>(contents.size());
-		for ( Content content : contents ) {
-			if ( contentTypeId!=null && !content.contentTypeId.equals(contentTypeId) ) continue;
-			if ( formatId!=null && !content.formatId.equals(formatId) ) continue;
-			result.add( content );
-		}
-		return result;
-	}
-	
-	public static List<String> toUris(Collection<Content> contents) {
-		List<String> result = new ArrayList<String>(contents.size());
-		for ( Content content : contents ) result.add( content.url );		
-		return result;
-	}	
-
-	public static Comparator<Content> CONTENT_COMPARATOR = new Comparator<Content>() {
-		@Override
-		public int compare(Content o1, Content o2) {
-			int c = AlphanumComparator.CASE_INSENSITIVE_COMPARATOR.compare(o1.url, o2.url);
-			if (c != 0)
-				return c;
-			c = AlphanumComparator.CASE_INSENSITIVE_COMPARATOR.compare(o1.formatId, o2.formatId);
-			if (c != 0)
-				return c;
-			return 0;
-		}
-	};
-
-	public static List<Content> sortContent(List<Content> content) {
-		Collections.sort(content, CONTENT_COMPARATOR);
-		return content;
-	}
-
-	public static List<Content> sortedContent(List<Content> content) {
-		ArrayList<Content> sorted = new ArrayList<Content>(content);
-		sortContent(sorted);
-		return sorted;
-	}
-
-}
+package org.simantics.export.core.util;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import org.osgi.service.prefs.BackingStoreException;
+import org.osgi.service.prefs.Preferences;
+import org.simantics.databoard.Accessors;
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.accessor.Accessor;
+import org.simantics.databoard.accessor.RecordAccessor;
+import org.simantics.databoard.accessor.UnionAccessor;
+import org.simantics.databoard.accessor.error.AccessorConstructionException;
+import org.simantics.databoard.accessor.error.AccessorException;
+import org.simantics.databoard.accessor.error.ReferenceException;
+import org.simantics.databoard.accessor.reference.ChildReference;
+import org.simantics.databoard.accessor.reference.LabelReference;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.databoard.binding.mutable.Variant;
+import org.simantics.databoard.type.Component;
+import org.simantics.databoard.type.UnionType;
+import org.simantics.export.core.ExportContext;
+import org.simantics.export.core.ExportExtensionPoint;
+import org.simantics.export.core.error.ExportException;
+import org.simantics.export.core.intf.Exporter;
+import org.simantics.export.core.intf.Publisher;
+import org.simantics.export.core.manager.Content;
+import org.simantics.utils.datastructures.MapList;
+import org.simantics.utils.strings.AlphanumComparator;
+
+public class ExporterUtils {
+
+	/**
+	 * Gets publisher location options from options variant.
+	 * 
+	 * @param ctx
+	 * @param publisherId
+	 * @param options
+	 * @return publisher options or null
+	 * @throws ExportException
+	 */
+	public static Variant getPublisherLocationOptions(ExportContext ctx, String publisherId, Variant options) throws ExportException {
+		try {			
+			Publisher publisher = ctx.eep.getPublisher(publisherId);
+			Variant locationOptions = options.getComponent( new LabelReference( publisher.label() ) );
+			return locationOptions;
+		} catch (AccessorConstructionException e) {
+			throw new ExportException( e ); 
+		}
+	}
+	
+	/**
+	 * Checks if key exists in a preference node
+	 * 
+	 * @param pref
+	 * @param key
+	 * @return true if key exists
+	 */
+	public static boolean containsKey(Preferences pref, String key) {
+		try {
+			for (String x : pref.keys()) if ( x.equals(key) ) return true;
+		} catch (BackingStoreException e) {
+			e.printStackTrace();
+		} 
+		return false;		
+	}
+	
+	/**
+	 * Get value of a key, in a preference node.
+	 * 
+	 * @param pref (optional)
+	 * @param key key
+	 * @return if pref and value exists, the value.
+	 */
+	public static String getPrefString(Preferences pref, String key) {
+		if ( pref == null ) return null;
+		if ( !containsKey(pref, key) ) return null;
+		return pref.get(key, null);
+	}
+
+	/**
+	 * Get value first from pref1, then pref2
+	 * @param pref1 (optional) pririty preference node
+	 * @param pref2 (optional) 2nd priority node
+	 * @param key 
+	 * @return possible value
+	 */
+	public static String getPrefString(Preferences pref1, Preferences pref2, String key) {
+		if ( pref1 != null && containsKey(pref1, key) ) return pref1.get(key, null);
+		if ( pref2 != null && containsKey(pref2, key) ) return pref2.get(key, null);
+		return null;
+	}
+
+	/**
+	 * Get value first from pref1, then pref2
+	 * @param pref1 (optional) pririty preference node
+	 * @param pref2 (optional) 2nd priority node
+	 * @param key 
+	 * @return possible value
+	 */
+	public static Integer getPrefInteger(Preferences pref1, Preferences pref2, String key) {
+		if ( pref1 != null && containsKey(pref1, key) ) return pref1.getInt(key, -1);
+		if ( pref2 != null && containsKey(pref2, key) ) return pref2.getInt(key, -1);
+		return null;
+	}
+
+	/**
+	 * Get value first from pref1, then pref2
+	 * @param pref1 (optional) pririty preference node
+	 * @param pref2 (optional) 2nd priority node
+	 * @param key 
+	 * @return possible value
+	 */
+	public static Boolean getPrefBoolean(Preferences pref1, Preferences pref2, String key) {
+		if ( pref1 != null && containsKey(pref1, key) ) return pref1.getBoolean(key, false);
+		if ( pref2 != null && containsKey(pref2, key) ) return pref2.getBoolean(key, false);
+		return null;
+	}
+	
+	/**
+	 * Get value first from pref1, then pref2
+	 * @param pref1 (optional) pririty preference node
+	 * @param pref2 (optional) 2nd priority node
+	 * @param key 
+	 * @return possible value
+	 */
+	public static Double getPrefDouble(Preferences pref1, Preferences pref2, String key) {
+		if ( pref1 != null && containsKey(pref1, key) ) return pref1.getDouble(key, 0.0);
+		if ( pref2 != null && containsKey(pref2, key) ) return pref2.getDouble(key, 0.0);
+		return null;
+	}
+	
+	public static void setPrefString(Preferences pref, String key, String value) {
+		if ( pref == null ) return;
+		if ( value == null ) {
+			pref.remove(key); 
+		} else {
+			pref.put(key, value);
+		}
+	}
+	
+	public static void setPrefInt(Preferences pref, String key, Integer value) {
+		if ( pref == null ) return;
+		if ( value == null ) {
+			pref.remove(key); 
+		} else {
+			pref.putInt(key, value);
+		}
+	}
+	
+	public static void setPrefdouble(Preferences pref, String key, Double value) {
+		if ( pref == null ) return;
+		if ( value == null ) {
+			pref.remove(key); 
+		} else {
+			pref.putDouble(key, value);
+		}
+	}
+
+	/**
+	 * Set enum or union value to an accessor, using the string name of the enum value.
+	 * If value doesn't exist, false is returned.
+	 * If tagName doesn't exist, false is returned.
+	 * 
+	 * @param ra accessor
+	 * @param ref child reference
+	 * @param tagName (optional) the tag name
+	 * @return true if value was set
+	 */
+	public static boolean setUnionValue(Accessor ra, ChildReference ref, String tagName) {
+		if ( tagName == null ) return false;
+    	try {        		
+    		UnionAccessor ua = ra.getComponent( ref );
+    		UnionType ut = ua.type();    		
+    		int tag = ut.getComponentIndex2( tagName );
+    		if ( tag<0 ) return false;
+    		Component c = ut.components[tag];
+    		Binding cb = Bindings.getMutableBinding(c.type);
+    		Object o = cb.createDefault();
+    		ua.setComponentValue( tag, cb, o);
+    		return true;
+    	} catch (ReferenceException re) {        	
+    		return false;
+    	} catch (AccessorConstructionException e) {
+    		e.printStackTrace();
+    		return false;
+		} catch (AccessorException e) {
+			e.printStackTrace();
+    		return false;
+		} catch (BindingException e) {
+			e.printStackTrace();
+    		return false;
+		}            					
+	}
+
+	/**
+	 * Set enum or union value to an accessor, using the string name of the enum value.
+	 * If value doesn't exist, false is returned.
+	 * If tagName doesn't exist, false is returned.
+	 * 
+	 * @param ra accessor
+	 * @param ref child reference
+	 * @param tag the tag number (applied only if >=0)
+	 * @return true if value was set
+	 */
+	public static boolean setUnionValue(Accessor ra, ChildReference ref, int tag) {
+		if ( tag<0 ) return false;
+    	try {        		
+    		UnionAccessor ua = ra.getComponent( ref );
+    		UnionType ut = ua.type();    		
+    		Component c = ut.components[tag];
+    		Binding cb = Bindings.getMutableBinding(c.type);
+    		Object o = cb.createDefault();
+    		ua.setComponentValue( tag, cb, o);
+    		return true;
+    	} catch (ReferenceException re) {        	
+    		return false;
+    	} catch (AccessorConstructionException e) {
+    		e.printStackTrace();
+    		return false;
+		} catch (AccessorException e) {
+			e.printStackTrace();
+    		return false;
+		} catch (BindingException e) {
+			e.printStackTrace();
+    		return false;
+		}            					
+	}
+	
+	
+	/**
+	 * Get union value as a String
+	 * 
+	 * @param ra
+	 * @param ref
+	 * @return the union value as string or null if error occured
+	 */
+	public static String getUnionValue(Accessor ra, ChildReference ref) {
+    	try {        		
+    		UnionAccessor ua = ra.getComponent( ref );
+    		UnionType ut = ua.type();
+    		int tag = ua.getTag();
+    		return ut.components[tag].name;
+    	} catch (ReferenceException re) {        	
+    		return null;
+    	} catch (AccessorConstructionException e) {
+    		e.printStackTrace();
+    		return null;
+		} catch (AccessorException e) {
+			e.printStackTrace();
+    		return null;
+		}            					
+		
+	}
+
+	/**
+	 * 
+	 * @param ra
+	 * @param ref
+	 * @return tag or -1
+	 */
+	public static int getUnionInt(Accessor ra, ChildReference ref) {
+    	try {        		
+    		UnionAccessor ua = ra.getComponent( ref );
+    		int tag = ua.getTag();
+    		return tag;
+    	} catch (ReferenceException re) {        	
+    		return -1;
+    	} catch (AccessorConstructionException e) {
+    		e.printStackTrace();
+    		return -1;
+		} catch (AccessorException e) {
+			e.printStackTrace();
+    		return -1;
+		}            					
+		
+	}
+	
+	/**
+	 * Read string value from an location
+	 * 
+	 * @param location
+	 * @param ref
+	 * @return the value or null, if did not exist
+	 */
+	public static String getString(Variant location, ChildReference ref) {
+		try {
+			RecordAccessor ra = Accessors.getAccessor(location);
+			return (String) ra.getValue( ref, Bindings.STRING );
+		} catch (AccessorConstructionException e) {
+			return null;
+		} catch (AccessorException e) {
+			return null;
+		}					
+	}
+	
+	public static Boolean getBoolean(Variant location, ChildReference ref) {
+		try {
+			RecordAccessor ra = Accessors.getAccessor(location);
+			return (Boolean) ra.getValue( ref, Bindings.BOOLEAN );
+		} catch (AccessorConstructionException e) {
+			return null;
+		} catch (AccessorException e) {
+			return null;
+		}					
+	}
+	
+	public static Comparator<Content> createExportPriorityComparator( final ExportExtensionPoint eep ) {
+		return new Comparator<Content>() {
+
+			@Override
+			public int compare(Content c1, Content c2) {
+				
+				int p1 = Integer.MAX_VALUE;
+				for (Exporter e : eep.getExporters(c1.formatId, c1.contentTypeId)) 
+					p1 = Math.min(p1, e.getExportPriority());
+				
+				int p2 = Integer.MAX_VALUE;
+				for (Exporter e : eep.getExporters(c2.formatId, c2.contentTypeId)) 
+					p2 = Math.min(p2, e.getExportPriority());
+				
+				return Integer.signum( p1 - p2 );
+			}
+			
+		};		
+	}
+	
+	/**
+	 * Takes a maplist of contents as input and filters out all that matches
+	 * to the given uri.  
+	 * 
+	 * @param map
+	 * @param contentUri
+	 * @return map with contents of given Uri.
+	 */
+	public static MapList<Content, Content> filterByUri(MapList<Content, Content> map, String contentUri) {
+		if ( map == null ) return null;
+		MapList<Content, Content> result = new MapList<Content, Content>();
+		for ( Content key : map.getKeys() ) {						
+			if ( key.url.equals(contentUri) ) {
+				result.addAll(key, map.getValuesUnsafe(key));
+			}
+		}
+		return result;
+	}
+	
+	public static MapList<String, Content> toStringMap(MapList<Content, Content> map) {
+		if ( map == null ) return null;
+		MapList<String, Content> result = new MapList<String, Content>();
+		for ( Content key : map.getKeys() ) {
+			result.addAll(key.url, map.getValuesUnsafe(key));
+		}		
+		return result;
+	}
+	
+	public static List<Content> filterContents(Collection<Content> contents, String contentTypeId, String formatId) {
+		if ( contents==null ) return null;
+		List<Content> result = new ArrayList<Content>(contents.size());
+		for ( Content content : contents ) {
+			if ( contentTypeId!=null && !content.contentTypeId.equals(contentTypeId) ) continue;
+			if ( formatId!=null && !content.formatId.equals(formatId) ) continue;
+			result.add( content );
+		}
+		return result;
+	}
+	
+	public static List<String> toUris(Collection<Content> contents) {
+		List<String> result = new ArrayList<String>(contents.size());
+		for ( Content content : contents ) result.add( content.url );		
+		return result;
+	}	
+
+	public static Comparator<Content> CONTENT_COMPARATOR = new Comparator<Content>() {
+		@Override
+		public int compare(Content o1, Content o2) {
+			int c = AlphanumComparator.CASE_INSENSITIVE_COMPARATOR.compare(o1.url, o2.url);
+			if (c != 0)
+				return c;
+			c = AlphanumComparator.CASE_INSENSITIVE_COMPARATOR.compare(o1.formatId, o2.formatId);
+			if (c != 0)
+				return c;
+			return 0;
+		}
+	};
+
+	public static List<Content> sortContent(List<Content> content) {
+		Collections.sort(content, CONTENT_COMPARATOR);
+		return content;
+	}
+
+	public static List<Content> sortedContent(List<Content> content) {
+		ArrayList<Content> sorted = new ArrayList<Content>(content);
+		sortContent(sorted);
+		return sorted;
+	}
+
+}