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java/javax/el/BeanNameELResolver.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.Iterator;
+import java.util.Objects;
+
+/**
+ * @since EL 3.0
+ */
+public class BeanNameELResolver extends ELResolver {
+
+    private final BeanNameResolver beanNameResolver;
+
+    public BeanNameELResolver(BeanNameResolver beanNameResolver) {
+        this.beanNameResolver = beanNameResolver;
+    }
+
+    @Override
+    public Object getValue(ELContext context, Object base, Object property) {
+        Objects.requireNonNull(context);
+        if (base != null || !(property instanceof String)) {
+            return null;
+        }
+
+        String beanName = (String) property;
+
+        if (beanNameResolver.isNameResolved(beanName)) {
+            try {
+                Object result = beanNameResolver.getBean(beanName);
+                context.setPropertyResolved(base, property);
+                return result;
+            } catch (Throwable t) {
+                Util.handleThrowable(t);
+                throw new ELException(t);
+            }
+        }
+
+        return null;
+    }
+
+    @Override
+    public void setValue(ELContext context, Object base, Object property,
+            Object value) {
+        Objects.requireNonNull(context);
+        if (base != null || !(property instanceof String)) {
+            return;
+        }
+
+        String beanName = (String) property;
+
+        boolean isResolved = context.isPropertyResolved();
+
+        boolean isReadOnly;
+        try {
+            isReadOnly = isReadOnly(context, base, property);
+        } catch (Throwable t) {
+            Util.handleThrowable(t);
+            throw new ELException(t);
+        } finally {
+            context.setPropertyResolved(isResolved);
+        }
+
+        if (isReadOnly) {
+            throw new PropertyNotWritableException(Util.message(context,
+                    "beanNameELResolver.beanReadOnly", beanName));
+        }
+
+        if (beanNameResolver.isNameResolved(beanName) ||
+                beanNameResolver.canCreateBean(beanName)) {
+            try {
+                beanNameResolver.setBeanValue(beanName, value);
+                context.setPropertyResolved(base, property);
+            } catch (Throwable t) {
+                Util.handleThrowable(t);
+                throw new ELException(t);
+            }
+        }
+    }
+
+    @Override
+    public Class<?> getType(ELContext context, Object base, Object property) {
+        Objects.requireNonNull(context);
+        if (base != null || !(property instanceof String)) {
+            return null;
+        }
+
+        String beanName = (String) property;
+
+        try {
+            if (beanNameResolver.isNameResolved(beanName)) {
+                Class<?> result = beanNameResolver.getBean(beanName).getClass();
+                context.setPropertyResolved(base, property);
+                return result;
+            }
+        } catch (Throwable t) {
+            Util.handleThrowable(t);
+            throw new ELException(t);
+        }
+
+        return null;
+    }
+
+    @Override
+    public boolean isReadOnly(ELContext context, Object base, Object property) {
+        Objects.requireNonNull(context);
+        if (base != null || !(property instanceof String)) {
+            // Return value undefined
+            return false;
+        }
+
+        String beanName = (String) property;
+
+        if (beanNameResolver.isNameResolved(beanName)) {
+            boolean result;
+            try {
+                result = beanNameResolver.isReadOnly(beanName);
+            } catch (Throwable t) {
+                Util.handleThrowable(t);
+                throw new ELException(t);
+            }
+            context.setPropertyResolved(base, property);
+            return result;
+        }
+
+        // Return value undefined
+        return false;
+    }
+
+    @Override
+    public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
+            Object base) {
+        return null;
+    }
+
+    @Override
+    public Class<?> getCommonPropertyType(ELContext context, Object base) {
+        return String.class;
+    }
+}