writetag.java

天乙社区6.0是一套基于JAVA技术的网络虚拟社区

package com.laoer.bbscs.web.tag;

import java.util.Locale;
import java.text.SimpleDateFormat;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.Format;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.TagSupport;

import org.apache.struts.util.MessageResources;
import org.apache.struts.util.RequestUtils;
import org.apache.struts.util.ResponseUtils;

import com.laoer.comm.util.*;
import com.laoer.bbscs.sys.*;
/**
 * <p>Title: TianYi BBS</p>
 * <p>Description: TianYi BBS System</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: LAOER.COM/TIANYISOFT.NET</p>
 * @author laoer
 * @version 6.0
 */

public class WriteTag
    extends TagSupport {
  /**
   * The key to search default format string for
   * java.sql.Timestamp in resources.
   */
  public static final String SQL_TIMESTAMP_FORMAT_KEY =
      "org.apache.struts.taglib.bean.format.sql.timestamp";

  /**
   * The key to search default format string for
   * java.sql.Date in resources.
   */
  public static final String SQL_DATE_FORMAT_KEY =
      "org.apache.struts.taglib.bean.format.sql.date";

  /**
   * The key to search default format string for
   * java.sql.Time in resources.
   */
  public static final String SQL_TIME_FORMAT_KEY =
      "org.apache.struts.taglib.bean.format.sql.time";

  /**
   * The key to search default format string for
   * java.util.Date in resources.
   */
  public static final String DATE_FORMAT_KEY =
      "org.apache.struts.taglib.bean.format.date";

  /**
   * The key to search default format string for int
   * (byte, short, etc.) in resources.
   */
  public static final String INT_FORMAT_KEY =
      "org.apache.struts.taglib.bean.format.int";

  /**
   * The key to search default format string for float
   * (double, BigDecimal) in resources.
   */
  public static final String FLOAT_FORMAT_KEY =
      "org.apache.struts.taglib.bean.format.float";

  /**
   * The message resources for this package.
   */
  protected static MessageResources messages =
      MessageResources.getMessageResources
      ("org.apache.struts.taglib.bean.LocalStrings");

  // ------------------------------------------------------------- Properties


  /**
   * Filter the rendered output for characters that are sensitive in HTML?
   */
  protected boolean filter = true;

  public boolean getFilter() {
    return (this.filter);
  }

  public void setFilter(boolean filter) {
    this.filter = filter;
  }

  /**
   * Should we ignore missing beans and simply output nothing?
   */
  protected boolean ignore = false;

  public boolean getIgnore() {
    return (this.ignore);
  }

  public void setIgnore(boolean ignore) {
    this.ignore = ignore;
  }

  /**
   * Name of the bean that contains the data we will be rendering.
   */
  protected String name = null;

  public String getName() {
    return (this.name);
  }

  public void setName(String name) {
    this.name = name;
  }

  /**
   * Name of the property to be accessed on the specified bean.
   */
  protected String property = null;

  public String getProperty() {
    return (this.property);
  }

  public void setProperty(String property) {
    this.property = property;
  }

  /**
   * The scope to be searched to retrieve the specified bean.
   */
  protected String scope = null;

  public String getScope() {
    return (this.scope);
  }

  public void setScope(String scope) {
    this.scope = scope;
  }

  /**
   * The format string to be used as format to convert
   * value to String.
   */
  protected String formatStr = null;

  public String getFormat() {
    return (this.formatStr);
  }

  public void setFormat(String formatStr) {
    this.formatStr = formatStr;
  }

  /**
   * The key to search format string in applciation resources
   */
  protected String formatKey = null;

  public String getFormatKey() {
    return (this.formatKey);
  }

  public void setFormatKey(String formatKey) {
    this.formatKey = formatKey;
  }

  /**
   * The session scope key under which our Locale is stored.
   */
  protected String localeKey = null;

  public String getLocale() {
    return (this.localeKey);
  }

  public void setLocale(String localeKey) {
    this.localeKey = localeKey;
  }

  /**
   * The servlet context attribute key for our resources.
   */
  protected String bundle = null;
  private String type;
  private boolean br;

  public String getBundle() {
    return (this.bundle);
  }

  public void setBundle(String bundle) {
    this.bundle = bundle;
  }

  // --------------------------------------------------------- Public Methods


  /**
   * Process the start tag.
   *
   * @exception JspException if a JSP exception has occurred
   */
  public int doStartTag() throws JspException {

    // Look up the requested bean (if necessary)
    if (ignore) {
      if (RequestUtils.lookup(pageContext, name, scope) == null) {
        return (SKIP_BODY); // Nothing to output
      }
    }

    // Look up the requested property value
    Object value =
        RequestUtils.lookup(pageContext, name, property, scope);
    if (value == null) {
      return (SKIP_BODY); // Nothing to output
    }

    // Convert value to the String with some formatting
    String output = formatValue(value);

    // Print this property value to our output writer, suitably filtered
    if (type != null && type.equals("note")) {
      if (SysInfo.getInstance().getNotehtml() == 0){
        if (br) {
          ResponseUtils.write(pageContext,
                              Util.replaceBr(ResponseUtils.filter(output)));
        }
        else {
          ResponseUtils.write(pageContext, ResponseUtils.filter(output));
        }
      }
      else {
        if (br) {
          ResponseUtils.write(pageContext, Util.replaceBr(output));
        }
        else {
          ResponseUtils.write(pageContext, output);
        }
        // Continue processing this page
      }
    }
    else {
      if (filter) {
        if (br) {
          ResponseUtils.write(pageContext,
                              Util.replaceBr(ResponseUtils.filter(output)));
        }
        else {
          ResponseUtils.write(pageContext, ResponseUtils.filter(output));
        }

      }
      else {
        if (br) {
          ResponseUtils.write(pageContext, Util.replaceBr(output));
        }
        else {
          ResponseUtils.write(pageContext, output);
        }
        // Continue processing this page
      }
    }
    return (SKIP_BODY);

  }

  /**
   * Retrieve format string from message bundle and return null if
   * message not found or message string.
   *
   * @param formatKey value to use as key to search message in bundle
   * @exception JspException if a JSP exception has occurred
   */
  protected String retrieveFormatString(String formatKey) throws JspException {
    String result = RequestUtils.message(pageContext, this.bundle,
                                         this.localeKey, formatKey);
    if ( (result != null) &&
        ! (result.startsWith("???") &&
           result.endsWith("???"))) {
      return result;
    }
    else {
      return null;
    }
  }

  /**
   * Format value according to specified format string (as tag attribute or
   * as string from message resources) or to current user locale.
   *
   * @param valueToFormat value to process and convert to String
   * @exception JspException if a JSP exception has occurred
   */
  protected String formatValue(Object valueToFormat) throws JspException {
    Format format = null;
    Object value = valueToFormat;
    Locale locale =
        RequestUtils.retrieveUserLocale(pageContext, this.localeKey);
    boolean formatStrFromResources = false;
    String formatString = formatStr;

    // Return String object as is.
    if (value instanceof java.lang.String) {
      return (String) value;
    }
    else {

      // Try to retrieve format string from resources by the key from formatKey.
      if ( (formatString == null) && (formatKey != null)) {
        formatString = retrieveFormatString(this.formatKey);
        if (formatString != null) {
          formatStrFromResources = true;
        }
      }

      // Prepare format object for numeric values.
      if (value instanceof Number) {

        if (formatString == null) {
          if ( (value instanceof Byte) ||
              (value instanceof Short) ||
              (value instanceof Integer) ||
              (value instanceof Long) ||
              (value instanceof BigInteger)) {
            formatString = retrieveFormatString(INT_FORMAT_KEY);
          }
          else if ( (value instanceof Float) ||
                   (value instanceof Double) ||
                   (value instanceof BigDecimal)) {
            formatString = retrieveFormatString(FLOAT_FORMAT_KEY);
          }
          if (formatString != null) {
            formatStrFromResources = true;
          }
        }

        if (formatString != null) {
          try {
            format = NumberFormat.getNumberInstance(locale);
            if (formatStrFromResources) {
              ( (DecimalFormat) format).applyLocalizedPattern(formatString);
            }
            else {
              ( (DecimalFormat) format).applyPattern(formatString);
            }
          }
          catch (IllegalArgumentException _e) {
            JspException e = new JspException(messages.getMessage(
                "write.format", formatString));
            RequestUtils.saveException(pageContext, e);
            throw e;
          }
        }

      }
      else if (value instanceof java.util.Date) {

        if (formatString == null) {

          if (value instanceof java.sql.Timestamp) {
            formatString = retrieveFormatString(SQL_TIMESTAMP_FORMAT_KEY);
          }
          else if (value instanceof java.sql.Date) {
            formatString = retrieveFormatString(SQL_DATE_FORMAT_KEY);
          }
          else if (value instanceof java.sql.Time) {
            formatString = retrieveFormatString(SQL_TIME_FORMAT_KEY);
          }
          else if (value instanceof java.util.Date) {
            formatString = retrieveFormatString(DATE_FORMAT_KEY);
          }

          if (formatString != null) {
            formatStrFromResources = true;

          }
        }

        if (formatString != null) {
          if (formatStrFromResources) {
            format = new SimpleDateFormat(formatString, locale);
          }
          else {
            format = new SimpleDateFormat(formatString);
          }
        }

      }
    }

    if (format != null) {
      return format.format(value);
    }
    else {
      return value.toString();
    }

  }

  /**
   * Release all allocated resources.
   */
  public void release() {

    super.release();
    filter = true;
    ignore = false;
    name = null;
    property = null;
    scope = null;
    formatStr = null;
    formatKey = null;
    localeKey = null;
    bundle = null;

  }

  public String getType() {
    return type;
  }

  public void setType(String type) {
    this.type = type;
  }

  public boolean isBr() {
    return br;
  }

  public void setBr(boolean br) {
    this.br = br;
  }

}