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    1   /*
    2    * $Id: Debug.java 497654 2007-01-19 00:21:57Z rgielen $
    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.components;
    22
    23  import com.opensymphony.xwork2.util.ValueStack;
    24  import com.opensymphony.xwork2.util.OgnlUtil;
    25
    26  import javax.servlet.http.HttpServletResponse;
    27  import javax.servlet.http.HttpServletRequest;
    28  import java.io.Writer;
    29  import java.util.Iterator;
    30  import java.util.Map;
    31  import java.util.ArrayList;
    32  import java.util.List;
    33
    34  import org.apache.struts2.views.annotations.StrutsTag;
    35  import org.apache.struts2.StrutsException;
    36
    37  @StrutsTag(name="debug", tldTagClass="org.apache.struts2.views.jsp.ui.DebugTag",
    38          description="Prints debugging information")
    39  public class Debug extends UIBean {
    40      public static final String TEMPLATE = "debug";
    41
    42      public Debug(ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
    43          super(stack, request, response);
    44      }
    45
    46      protected String getDefaultTemplate() {
    47          return TEMPLATE;
    48      }
    49
    50      public boolean start(Writer writer) {
    51          boolean result = super.start(writer);
    52
    53          ValueStack stack = getStack();
    54          Iterator iter = stack.getRoot().iterator();
    55          List stackValues = new ArrayList(stack.getRoot().size());
    56          while (iter.hasNext()) {
    57              Object o = iter.next();
    58              Map values;
    59              try {
    60                  values = OgnlUtil.getBeanMap(o);
    61              } catch (Exception e) {
    62                  throw new StrutsException("Caught an exception while getting the property values of " + o, e);
    63              }
    64              stackValues.add(new DebugMapEntry(o.getClass().getName(), values));
    65          }
    66
    67          addParameter("stackValues", stackValues);
    68
    69          return result;
    70      }
    71
    72      private class DebugMapEntry implements Map.Entry {
    73          private Object key;
    74          private Object value;
    75
    76          DebugMapEntry(Object key, Object value) {
    77              this.key = key;
    78              this.value = value;
    79          }
    80
    81          public Object getKey() {
    82              return key;
    83          }
    84
    85          public Object getValue() {
    86              return value;
    87          }
    88
    89          public Object setValue(Object newVal) {
    90              Object oldVal = value;
    91              value = newVal;
    92              return oldVal;
    93          }
    94      }
    95
    96  }