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    1   /*
    2    * $Id: StrutsVelocityContext.java 471756 2006-11-06 15:01:43Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21  package org.apache.struts2.views.velocity;
    22
    23  import org.apache.velocity.VelocityContext;
    24
    25  import com.opensymphony.xwork2.util.ValueStack;
    26
    27
    28  /***
    29   */
    30  public class StrutsVelocityContext extends VelocityContext {
    31
    32      private static final long serialVersionUID = 8497212428904436963L;
    33      ValueStack stack;
    34      VelocityContext[] chainedContexts;
    35
    36
    37      public StrutsVelocityContext(ValueStack stack) {
    38          this(null, stack);
    39      }
    40
    41      public StrutsVelocityContext(VelocityContext[] chainedContexts, ValueStack stack) {
    42          this.chainedContexts = chainedContexts;
    43          this.stack = stack;
    44      }
    45
    46
    47      public boolean internalContainsKey(Object key) {
    48          boolean contains = super.internalContainsKey(key);
    49
    50          // first let's check to see if we contain the requested key
    51          if (contains) {
    52              return true;
    53          }
    54
    55          // if not, let's search for the key in the ognl value stack
    56          if (stack != null) {
    57              Object o = stack.findValue(key.toString());
    58
    59              if (o != null) {
    60                  return true;
    61              }
    62
    63              o = stack.getContext().get(key.toString());
    64              if (o != null) {
    65                  return true;
    66              }
    67          }
    68
    69          // if we still haven't found it, le's search through our chained contexts
    70          if (chainedContexts != null) {
    71              for (int index = 0; index < chainedContexts.length; index++) {
    72                  if (chainedContexts[index].containsKey(key)) {
    73                      return true;
    74                  }
    75              }
    76          }
    77
    78          // nope, i guess it's really not here
    79          return false;
    80      }
    81
    82      public Object internalGet(String key) {
    83          // first, let's check to see if have the requested value
    84          if (super.internalContainsKey(key)) {
    85              return super.internalGet(key);
    86          }
    87
    88          // still no luck?  let's look against the value stack
    89          if (stack != null) {
    90              Object object = stack.findValue(key);
    91
    92              if (object != null) {
    93                  return object;
    94              }
    95
    96              object = stack.getContext().get(key);
    97              if (object != null) {
    98                  return object;
    99              }
    100
    101         }
    102
    103         // finally, if we're chained to other contexts, let's look in them
    104         if (chainedContexts != null) {
    105             for (int index = 0; index < chainedContexts.length; index++) {
    106                 if (chainedContexts[index].containsKey(key)) {
    107                     return chainedContexts[index].internalGet(key);
    108                 }
    109             }
    110         }
    111
    112         // nope, i guess it's really not here
    113         return null;
    114     }
    115 }