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java/org/apache/jasper/el/ELContextImpl.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.jasper.el;
+
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.el.ArrayELResolver;
+import javax.el.BeanELResolver;
+import javax.el.CompositeELResolver;
+import javax.el.ELContext;
+import javax.el.ELManager;
+import javax.el.ELResolver;
+import javax.el.ExpressionFactory;
+import javax.el.FunctionMapper;
+import javax.el.ListELResolver;
+import javax.el.MapELResolver;
+import javax.el.ResourceBundleELResolver;
+import javax.el.StaticFieldELResolver;
+import javax.el.ValueExpression;
+import javax.el.VariableMapper;
+
+import org.apache.jasper.Constants;
+
+/**
+ * Implementation of ELContext
+ *
+ * @author Jacob Hookom
+ */
+public class ELContextImpl extends ELContext {
+
+    private static final FunctionMapper NullFunctionMapper = new FunctionMapper() {
+        @Override
+        public Method resolveFunction(String prefix, String localName) {
+            return null;
+        }
+    };
+
+    private static final class VariableMapperImpl extends VariableMapper {
+
+        private Map<String, ValueExpression> vars;
+
+        @Override
+        public ValueExpression resolveVariable(String variable) {
+            if (vars == null) {
+                return null;
+            }
+            return vars.get(variable);
+        }
+
+        @Override
+        public ValueExpression setVariable(String variable,
+                ValueExpression expression) {
+            if (vars == null) {
+                vars = new HashMap<>();
+            }
+            if (expression == null) {
+                return vars.remove(variable);
+            } else {
+                return vars.put(variable, expression);
+            }
+        }
+    }
+
+    private static final ELResolver DefaultResolver;
+
+    static {
+        if (Constants.IS_SECURITY_ENABLED) {
+            DefaultResolver = null;
+        } else {
+            DefaultResolver = new CompositeELResolver();
+            ((CompositeELResolver) DefaultResolver).add(
+                    ELManager.getExpressionFactory().getStreamELResolver());
+            ((CompositeELResolver) DefaultResolver).add(new StaticFieldELResolver());
+            ((CompositeELResolver) DefaultResolver).add(new MapELResolver());
+            ((CompositeELResolver) DefaultResolver).add(new ResourceBundleELResolver());
+            ((CompositeELResolver) DefaultResolver).add(new ListELResolver());
+            ((CompositeELResolver) DefaultResolver).add(new ArrayELResolver());
+            ((CompositeELResolver) DefaultResolver).add(new BeanELResolver());
+        }
+    }
+
+    private final ELResolver resolver;
+
+    private FunctionMapper functionMapper = NullFunctionMapper;
+
+    private VariableMapper variableMapper;
+
+    public ELContextImpl(ExpressionFactory factory) {
+        this(getDefaultResolver(factory));
+    }
+
+    public ELContextImpl(ELResolver resolver) {
+        this.resolver = resolver;
+    }
+
+    @Override
+    public ELResolver getELResolver() {
+        return this.resolver;
+    }
+
+    @Override
+    public FunctionMapper getFunctionMapper() {
+        return this.functionMapper;
+    }
+
+    @Override
+    public VariableMapper getVariableMapper() {
+        if (this.variableMapper == null) {
+            this.variableMapper = new VariableMapperImpl();
+        }
+        return this.variableMapper;
+    }
+
+    public void setFunctionMapper(FunctionMapper functionMapper) {
+        this.functionMapper = functionMapper;
+    }
+
+    public void setVariableMapper(VariableMapper variableMapper) {
+        this.variableMapper = variableMapper;
+    }
+
+    public static ELResolver getDefaultResolver(ExpressionFactory factory) {
+        if (Constants.IS_SECURITY_ENABLED) {
+            CompositeELResolver defaultResolver = new CompositeELResolver();
+            defaultResolver.add(factory.getStreamELResolver());
+            defaultResolver.add(new StaticFieldELResolver());
+            defaultResolver.add(new MapELResolver());
+            defaultResolver.add(new ResourceBundleELResolver());
+            defaultResolver.add(new ListELResolver());
+            defaultResolver.add(new ArrayELResolver());
+            defaultResolver.add(new BeanELResolver());
+            return defaultResolver;
+        } else {
+            return DefaultResolver;
+        }
+    }
+}