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With inspiration from other libraries

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/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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.mvel2.compiler;

import org.mvel2.ast.ASTNode;
import org.mvel2.ast.Safe;
import org.mvel2.ast.TypeCast;
import org.mvel2.integration.VariableResolverFactory;


public class ExecutableAccessorSafe implements ExecutableStatement, Safe {
  private ASTNode node;

  private Class ingress;
  private Class egress;
  private boolean convertable;

  public ExecutableAccessorSafe(ASTNode node) {
    this.node = node;
  }

  public ExecutableAccessorSafe(ASTNode node, Class returnType) {
    this.node = node;
    this.egress = returnType;
  }

  public Object getValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory) {
    return node.getReducedValueAccelerated(ctx, elCtx, variableFactory);
  }

  public Object getValue(Object staticContext, VariableResolverFactory factory) {
    return node.getReducedValueAccelerated(staticContext, staticContext, factory);
  }

  public void setKnownIngressType(Class type) {
    this.ingress = type;
  }

  public void setKnownEgressType(Class type) {
    this.egress = type;
  }

  public Class getKnownIngressType() {
    return ingress;
  }

  public Class getKnownEgressType() {
    return egress;
  }

  public boolean isConvertableIngressEgress() {
    return convertable;
  }

  public void computeTypeConversionRule() {
    if (ingress != null && egress != null) {
      convertable = ingress.isAssignableFrom(egress);
    }
  }

  public boolean intOptimized() {
    return false;
  }

  public ASTNode getNode() {
    return node;
  }

  public Object setValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory, Object value) {
    return null;
  }

  public boolean isLiteralOnly() {
    return false;
  }

  public boolean isEmptyStatement() {
    return node == null;
  }

  public boolean isExplicitCast() {
    return node != null && node instanceof TypeCast;
  }
}