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java/org/apache/el/lang/VariableMapperImpl.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 org.apache.el.lang;
+
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.el.ValueExpression;
+import javax.el.VariableMapper;
+
+public class VariableMapperImpl extends VariableMapper implements Externalizable {
+
+    private static final long serialVersionUID = 1L;
+
+    private Map<String, ValueExpression> vars = new HashMap<>();
+
+    public VariableMapperImpl() {
+        super();
+    }
+
+    @Override
+    public ValueExpression resolveVariable(String variable) {
+        return this.vars.get(variable);
+    }
+
+    @Override
+    public ValueExpression setVariable(String variable,
+            ValueExpression expression) {
+        if (expression == null) {
+            return vars.remove(variable);
+        } else {
+            return vars.put(variable, expression);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public void readExternal(ObjectInput in) throws IOException,
+            ClassNotFoundException {
+        this.vars = (Map<String, ValueExpression>) in.readObject();
+    }
+
+    @Override
+    public void writeExternal(ObjectOutput out) throws IOException {
+        out.writeObject(this.vars);
+    }
+}