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    1   /*
    2    * $Id: ComponentTagSupport.java 474191 2006-11-13 08:30:40Z mrdon $
    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.jsp;
    22
    23  import javax.servlet.http.HttpServletRequest;
    24  import javax.servlet.http.HttpServletResponse;
    25  import javax.servlet.jsp.JspException;
    26
    27  import org.apache.struts2.components.Component;
    28  import org.apache.struts2.dispatcher.Dispatcher;
    29  import org.apache.struts2.dispatcher.mapper.ActionMapper;
    30
    31  import com.opensymphony.xwork2.inject.Container;
    32  import com.opensymphony.xwork2.inject.Inject;
    33  import com.opensymphony.xwork2.util.ValueStack;
    34
    35  /***
    36   */
    37  public abstract class ComponentTagSupport extends StrutsBodyTagSupport {
    38      protected Component component;
    39
    40      public abstract Component getBean(ValueStack stack, HttpServletRequest req, HttpServletResponse res);
    41
    42      public int doEndTag() throws JspException {
    43          component.end(pageContext.getOut(), getBody());
    44          component = null;
    45          return EVAL_PAGE;
    46      }
    47
    48      public int doStartTag() throws JspException {
    49          component = getBean(getStack(), (HttpServletRequest) pageContext.getRequest(), (HttpServletResponse) pageContext.getResponse());
    50          Container container = Dispatcher.getInstance().getContainer();
    51          container.inject(component);
    52
    53          populateParams();
    54          boolean evalBody = component.start(pageContext.getOut());
    55
    56          if (evalBody) {
    57              return component.usesBody() ? EVAL_BODY_BUFFERED : EVAL_BODY_INCLUDE;
    58          } else {
    59              return SKIP_BODY;
    60          }
    61      }
    62
    63      protected void populateParams() {
    64          component.setId(id);
    65      }
    66
    67      public Component getComponent() {
    68          return component;
    69      }
    70  }