diff --git a/spring-integration-core/src/main/java/org/springframework/integration/expression/ExpressionEvalMap.java b/spring-integration-core/src/main/java/org/springframework/integration/expression/ExpressionEvalMap.java
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+++ b/spring-integration-core/src/main/java/org/springframework/integration/expression/ExpressionEvalMap.java
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+/*
+ * Copyright 2013 the original author or authors.
+ *
+ * Licensed 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.springframework.integration.expression;
+
+import java.util.AbstractMap;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+
+import org.springframework.expression.EvaluationContext;
+import org.springframework.expression.Expression;
+
+/**
+ *
+ * An immutable {@link AbstractMap} implementation that wraps a Map
+ * and evaluates an {@code expression} for the provided {@code key} from the underlying
+ * {@code original} Map.
+ *
+ *
+ * Any mutating operations ({@link #put(String, Object)}, {@link #remove(Object)} etc.)
+ * are not allowed on instances of this class. Mutation can be performed on underlying Map
+ * if it supports it.
+ *
+ *
+ * A {@link ExpressionEvalMapBuilder} must be used to instantiate this class
+ * via its {@link #from(Map)} method:
+ * {@code
+ * ExpressionEvalMap evalMap = ExpressionEvalMap
+ * .from(expressions)
+ .usingCallback(new EvaluationCallback() {
+ Object evaluate(Expression expression) {
+ // return some expression evaluation
+ }
+ })
+ .build();
+ * }
+ *
+ *
+ * Thread-safety depends on the original underlying Map.
+ * Objects of this class are not serializable.
+ *
+ *
+ * @author Artem Bilan
+ * @since 3.0
+ */
+public final class ExpressionEvalMap extends AbstractMap {
+
+ public static final EvaluationCallback SIMPLE_CALLBACK = new EvaluationCallback() {
+
+ @Override
+ public Object evaluate(Expression expression) {
+ return expression.getValue();
+ }
+
+ };
+
+ private final Map original;
+
+ private final EvaluationCallback evaluationCallback;
+
+ private ExpressionEvalMap(Map original, EvaluationCallback evaluationCallback) {
+ this.original = original;
+ this.evaluationCallback = evaluationCallback;
+ }
+
+ /**
+ * Gets the {@code value}({@link Expression}) for the provided {@code key}
+ * from {@link #original} and returns the result of evaluation using {@link #evaluationCallback}.
+ */
+ @Override
+ public Object get(Object key) {
+ Expression expression = original.get(key);
+ if (expression != null) {
+ return this.evaluationCallback.evaluate(expression);
+ }
+ return null;
+ }
+
+ @Override
+ public Collection