workflow_jgraphgxlcodec.java

本人的工作流模型管理器与算法控制程序包

package treedoc;

// 修改原JGRPAH的类,添加写ICON属性的方法...
// 将流程图解码为GXL文件的主类和方法
// 实际上要XPDL格式的文档也是在这里实现

/**
 * 名称       : WORKFLOW_JGRAPHGXLCODEC
 * 描述       : WWW.FANGFA.NET 工作流管理系统--生成流程拓扑图GXL文件类
 * 版权信息   : Copyright (c) 2004 COMSCI
 * @作者      : COMSCI Sichuan Fangfa Digital
 * @版本      : 0.9 builder 2004091910
 * @日期      : 2004/09/19
 */



import javax.swing.*;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.jgraph.JGraph;
import org.jgraph.graph.ConnectionSet;
import org.jgraph.graph.DefaultEdge;
import org.jgraph.graph.DefaultGraphCell;
import org.jgraph.graph.DefaultPort;
import org.jgraph.graph.GraphCell;
import org.jgraph.graph.GraphConstants;
import org.jgraph.graph.GraphModel;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.jgraph.util.JGraphUtilities;

/**
 * @author Gaudenz Alder
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
public class workflow_JGraphGXLCodec {

  static transient Hashtable encodeHash;
  static transient Hashtable decodeHash;

  /**
   * Retrieves the encoding Hashtable with the node's Id.
   *
   * It may be usefull to sirialize the values of the nodes.
   * @return Hastable with elements : ((key : node), (value : GXL id)).
   */
  public static Hashtable getLastEncodingHashtable() {
    return encodeHash;
  }

  /**
   * Retrieves the decoding Hashtable with the node's Id.
   *
   * It may be usefull to sirialize the values of the nodes.
   * @return Hastable with elements : ((key : node), (value : GXL id)).
   */
  public static Hashtable getLastDecodingHashtable() {
    return decodeHash;
  }

  /**
   * Create a GXL-representation for all the cells.
   *
   * @param graph JGraph to encode.
   * @return Encoded string.
   */
  public static String encode(JGraph graph) {
    Object[] cells = graph.getDescendants(graph.getRoots());
    return encode(graph, cells);
  }

  /**
   * Create a GXL-representation for the specified cells.
   *
   * @param graph JGraph to encode.
   * @param cells Selected cells to be encoded.
   * @return Encoded string.
   */
  public static String encode(JGraph graph, Object[] cells) {
    int counter = 0;
    encodeHash = new Hashtable();
    String gxl = "<?xml version=\"1.0\"?>\n" +
        "<!DOCTYPE gxl>\n" +
        "<gxl xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n" +
        "<graph id=\"jGraph\">\n";

    // Create external keys for nodes
    for (int i = 0; i < cells.length; i++) {
      if (JGraphUtilities.isVertex(graph, cells[i])) {
        encodeHash.put(cells[i], "node" + counter);
        counter++;
      }
    }

    // Convert Nodes
    Iterator it = encodeHash.keySet().iterator();
    while (it.hasNext()) {
      Object node = it.next();
      gxl += encodeVertex(graph, (String) encodeHash.get(node), node);
    }

    // Convert Edges
    int edges = 0;
    for (int i = 0; i < cells.length; i++) {
      if (graph.getModel().isEdge(cells[i])) {
        gxl += encodeEdge(graph, new Integer(edges++), cells[i]);

        // Close main tags
      }
    }
    gxl += "\n</graph>\n</gxl>";
    return gxl;
  }

  /**
   * Create a string with tabs.
   *
   * @param level Tab level.
   * @return Tab string.
   */
  private static String createTab(int level) {
    String tab = "";
    for (int i = 0; i < level; i++) {
      tab += "\t";
    }
    return tab;
  }

  /**
   * Basic value encoding.
   *
   * @param type GXL Type of the value (int, bool, ...)
   * @param value Value to be encoded.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeValue(String type, String value, int level) {
    return createTab(level) + "<" + type + ">" + value + "</" + type + ">\n";
  }

  /**
   * Basic boolean encoding.
   *
   * @param value Value to be encoded.
   * @param level Tab level.
   * @return Encoded string.
   */
  private static String encodeValue(boolean value, int level) {
    return createTab(level) + "<bool>" + value + "</bool>\n";
  }

  /**
   * Basic integer encoding.
   *
   * @param value Value to be encoded.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeValue(int value, int level) {
    return createTab(level) + "<int>" + value + "</int>\n";
  }

  /**
   * Basic String encoding.
   *
   * @param value Value to be encoded.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeValue(String value, int level) {
    return createTab(level) + "<string>" + value + "</string>\n";
  }

  /**
   * Attribute encoding.
   *
   * @param values Values of the attribute.
   * @param attributeName name of the attribute.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeAttribute(String values, String attributeName,
                                          int level) {
    String tab = createTab(level);
    return tab + "<attr name=\"" + attributeName + "\">\n" + values + tab +
        "</attr>\n";
  }

  /**
   * String encoding.
   *
   * @param value Value of the attribute.
   * @param attributeName name of the attribute.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeString(String value, String attributeName,
                                       int level) {
    if (value != null) {
      return encodeAttribute(encodeValue(value, level + 1), attributeName,
                             level);
    }
    else {
      return "";
    }
  }

  /**
   * Integer encoding.
   *
   * @param value Value of the attribute.
   * @param attributeName name of the attribute.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeInteger(int value, String attributeName,
                                        int level) {
    return encodeAttribute(encodeValue(value, level + 1), attributeName, level);
  }

  /**
   * Boolean encoding.
   *
   * @param value Value of the attribute.
   * @param attributeName name of the attribute.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeBoolean(boolean value, String attributeName,
                                        int level) {
    return encodeAttribute(encodeValue(value, level + 1), attributeName, level);
  }

  /**
   * Color encoding.
   *
   * @param color Color of the attribute.
   * @param attributeName name of the attribute.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeColor(Color color, String attributeName,
                                      int level) {
    if (color != null) {
      String tab1 = createTab(level + 1);
      int level2 = level + 2;
      String values = tab1 + "<tup>\n" +
          encodeValue(color.getRed(), level2) +
          encodeValue(color.getGreen(), level2) +
          encodeValue(color.getBlue(), level2) +
          tab1 + "</tup>\n";
      return encodeAttribute(values, attributeName, level);
    }
    else {
      return "";
    }
  }

  /**
   * Font encoding.
   *
   * @param font Font of the attribute.
   * @param attributeName name of the attribute.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeFont(Font font, String attributeName, int level) {
    if (font != null) {
      String tab1 = createTab(level + 1);
      int level2 = level + 2;
      String values = tab1 + "<tup>\n" +
          encodeValue(font.getFontName(), level2) +
          encodeValue(font.getStyle(), level2) +
          encodeValue(font.getSize(), level2) +
          tab1 + "</tup>\n";
      return encodeAttribute(values, attributeName, level);
    }
    else {
      return "";
    }
  }

  /**
   * Rectangle encoding.
   *
   * @param rec Rectangle to be encoded.
   * @param attributeName name of the attribute.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeRectangle(Rectangle2D rec, String attributeName,
                                          int level) {
    if (rec != null) {
      String tab1 = createTab(level + 1);
      int level2 = level + 2;
      String values = tab1 + "<tup>\n" +
          encodeValue( (int) rec.getCenterX(), level2) +
          encodeValue( (int) rec.getCenterY(), level2) +
          encodeValue( (int) rec.getWidth(), level2) +
          encodeValue( (int) rec.getHeight(), level2) +
          tab1 + "</tup>\n";
      return encodeAttribute(values, attributeName, level);
    }
    else {
      return "";
    }
  }

  /**
   * Bean encoding.
   * This is usefull to encode the userObject in the Vertex.
   * It must be a bean with a beanInfo class in order to inspect it.
   *
   * @param bean Bean to be encoded.
   * @param attributeName name of the attribute.
   * @param level Tab level.
   * @return Encoded string.
   */
  protected static String encodeBean(Object bean, String attributeName,
                                     int level) {
    String encoded = "";
    if (bean != null) {
      try {
        int level1 = level + 1;
        String tab1 = createTab(level1);
        int level2 = level + 2;
        BeanInfo bi = null;
        PropertyDescriptor tmpProperties[] = null;
        PropertyDescriptor prop = null;

        bi = Introspector.getBeanInfo(bean.getClass());
        tmpProperties = bi.getPropertyDescriptors();
        encoded += encodeString(bean.getClass().getName(), "ClassName", level1);
        for (int i = 0; i < tmpProperties.length; i++) {
          prop = tmpProperties[i];
          encoded +=
              encodeString(prop.getReadMethod().invoke(bean, null).toString(),
                           prop.getDisplayName(), level1);
        }
        encoded = encodeAttribute(encoded, attributeName, level);
      }
      catch (Exception e) {
        e.printStackTrace();
      }
    }
    return encoded;
  }

  /**
   * Encode a Vertex of a graph
   * @param graph Graph containing the vertex.
   * @param id Id of the vertex.
   * @param vertex Vertex to be encoded.
   * @return Encoded string.
   */
  protected static String encodeVertex(JGraph graph, String id, Object vertex) {
    int level = 2;
    String label = graph.convertValueToString(vertex);
    Map attributes = ( (GraphCell) vertex).getAttributes();
    String encoded = "\n\t<node id=\"" + id + "\">\n"
        + encodeString(label, "Label", level)
        + encodeRectangle(GraphConstants.getBounds(attributes), "Bounds", level)
        +
        encodeColor(GraphConstants.getBorderColor(attributes), "BorderColor",
                    level)
        +
        encodeColor(GraphConstants.getForeground(attributes), "BorderColor",
                    level)
        +
        encodeColor(GraphConstants.getBackground(attributes), "BorderColor",
                    level)
        + encodeFont(GraphConstants.getFont(attributes), "Font", level)
        +
        encodeColor(GraphConstants.getLineColor(attributes), "BorderColor",
                    level)
        + encodeIcon(GraphConstants.getIcon(attributes), "Icon", level)
        //+ encodeBoolean(GraphConstants.getOpaque(attributes), "Opaque", level)
        //+ encodeBean(GraphConstants.getValue(attributes), "Value", level)
        + "\t</node>";
    return encoded;
  }

  protected static String encodeIcon(Icon icon, String attributeName, int level) {
    if (icon != null) {
      String tab1 = createTab(level + 1);
      int level2 = level + 2;
      String values = tab1 + "<tup>\n" +
          encodeValue(icon.toString(), level2) +
          tab1 + "</tup>\n";
      return encodeAttribute(values, attributeName, level);