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A fork of MVEL by Axibase. Original version is hosted here: https://github.com/mvel/mvel. MVEL is a powerful expression language for Java-based applications. It provides a plethora of features and is suited for everything from the smallest property binding and extraction, to full blown scripts.

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/**
 * MVEL (The MVFLEX Expression Language)
 *
 * Copyright (C) 2007 Christopher Brock, MVFLEX/Valhalla Project and the Codehaus
 *
 * 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.optimizers.impl.refl.nodes;

import org.mvel2.compiler.AccessorNode;
import org.mvel2.compiler.ExecutableStatement;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.util.ParseTools;

import java.lang.reflect.Array;

import static org.mvel2.DataConversion.convert;

public class ArrayAccessorNest implements AccessorNode {
  private AccessorNode nextNode;
  private ExecutableStatement index;

  private Class baseComponentType;
  private boolean requireConversion;

  public ArrayAccessorNest() {
  }

  public ArrayAccessorNest(String index) {
    this.index = (ExecutableStatement) ParseTools.subCompileExpression(index.toCharArray());
  }

  public ArrayAccessorNest(ExecutableStatement stmt) {
    this.index = stmt;
  }

  public Object getValue(Object ctx, Object elCtx, VariableResolverFactory vars) {
    if (nextNode != null) {
      return nextNode.getValue(((Object[]) ctx)[(Integer) index.getValue(ctx, elCtx, vars)], elCtx, vars);
    }
    else {
      return ((Object[]) ctx)[(Integer) index.getValue(ctx, elCtx, vars)];
    }
  }

  public Object setValue(Object ctx, Object elCtx, VariableResolverFactory vars, Object value) {
    if (nextNode != null) {
      return nextNode.setValue(((Object[]) ctx)[(Integer) index.getValue(ctx, elCtx, vars)], elCtx, vars, value);
    }
    else {
      if (baseComponentType == null) {
        baseComponentType = ParseTools.getBaseComponentType(ctx.getClass());
        requireConversion = baseComponentType != value.getClass() && !baseComponentType.isAssignableFrom(value.getClass());
      }

      if (requireConversion) {
        Object o = convert(value, baseComponentType);
        Array.set(ctx, (Integer) index.getValue(ctx, elCtx, vars), o);
        return o;
      }
      else {
        Array.set(ctx, (Integer) index.getValue(ctx, elCtx, vars), value);
        return value;
      }
    }
  }

  public ExecutableStatement getIndex() {
    return index;
  }

  public void setIndex(ExecutableStatement index) {
    this.index = index;
  }

  public AccessorNode getNextNode() {
    return nextNode;
  }

  public AccessorNode setNextNode(AccessorNode nextNode) {
    return this.nextNode = nextNode;
  }

  public Class getKnownEgressType() {
    return baseComponentType;
  }

  public String toString() {
    return "Array Accessor -> [" + index + "]";
  }
}