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java/javax/el/ResourceBundleELResolver.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package javax.el;
+
+import java.beans.FeatureDescriptor;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.Iterator;
+import java.util.List;
+import java.util.MissingResourceException;
+import java.util.Objects;
+import java.util.ResourceBundle;
+
+public class ResourceBundleELResolver extends ELResolver {
+
+    public ResourceBundleELResolver() {
+        super();
+    }
+
+    @Override
+    public Object getValue(ELContext context, Object base, Object property) {
+        Objects.requireNonNull(context);
+
+        if (base instanceof ResourceBundle) {
+            context.setPropertyResolved(base, property);
+
+            if (property != null) {
+                try {
+                    return ((ResourceBundle) base).getObject(property
+                            .toString());
+                } catch (MissingResourceException mre) {
+                    return "???" + property.toString() + "???";
+                }
+            }
+        }
+
+        return null;
+    }
+
+    @Override
+    public Class<?> getType(ELContext context, Object base, Object property) {
+        Objects.requireNonNull(context);
+
+        if (base instanceof ResourceBundle) {
+            context.setPropertyResolved(base, property);
+        }
+
+        return null;
+    }
+
+    @Override
+    public void setValue(ELContext context, Object base, Object property,
+            Object value) {
+        Objects.requireNonNull(context);
+
+        if (base instanceof ResourceBundle) {
+            context.setPropertyResolved(base, property);
+            throw new PropertyNotWritableException(Util.message(context,
+                    "resolverNotWriteable", base.getClass().getName()));
+        }
+    }
+
+    @Override
+    public boolean isReadOnly(ELContext context, Object base, Object property) {
+        Objects.requireNonNull(context);
+
+        if (base instanceof ResourceBundle) {
+            context.setPropertyResolved(base, property);
+            return true;
+        }
+
+        return false;
+    }
+
+    @Override
+    public Iterator<FeatureDescriptor> getFeatureDescriptors(
+            ELContext context, Object base) {
+        if (base instanceof ResourceBundle) {
+            List<FeatureDescriptor> feats = new ArrayList<>();
+            Enumeration<String> e = ((ResourceBundle) base).getKeys();
+            FeatureDescriptor feat;
+            String key;
+            while (e.hasMoreElements()) {
+                key = e.nextElement();
+                feat = new FeatureDescriptor();
+                feat.setDisplayName(key);
+                feat.setShortDescription("");
+                feat.setExpert(false);
+                feat.setHidden(false);
+                feat.setName(key);
+                feat.setPreferred(true);
+                feat.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
+                feat.setValue(TYPE, String.class);
+                feats.add(feat);
+            }
+            return feats.iterator();
+        }
+        return null;
+    }
+
+    @Override
+    public Class<?> getCommonPropertyType(ELContext context, Object base) {
+        if (base instanceof ResourceBundle) {
+            return String.class;
+        }
+        return null;
+    }
+
+}