propertyprinter.java

随书的代码

import org.w3c.dom.*;
import java.io.*;


public class PropertyPrinter {

  private Writer out;
  
  public PropertyPrinter(Writer out) {
    if (out == null) {
      throw new NullPointerException("Writer must be non-null.");
    }
    this.out = out;
  }
  
  public PropertyPrinter() {
    this(new OutputStreamWriter(System.out));
  }
  
  private int nodeCount = 0;
  
  public void writeNode(Node node) throws IOException {
    
    if (node == null) {
      throw new NullPointerException("Node must be non-null.");
    }
    if (node.getNodeType() == Node.DOCUMENT_NODE 
     || node.getNodeType() == Node.DOCUMENT_FRAGMENT_NODE) { 
      // starting a new document, reset the node count
      nodeCount = 1; 
    }
    
    String name      = node.getNodeName(); // never null
    String type      = NodeTyper.getTypeName(node); // never null
    String localName = node.getLocalName();
    String uri       = node.getNamespaceURI();
    String prefix    = node.getPrefix();
    String value     = node.getNodeValue();
    
    StringBuffer result = new StringBuffer();
    result.append("Node " + nodeCount + ":\r\n");
    result.append("  Type: " + type + "\r\n");
    result.append("  Name: " + name + "\r\n");
    if (localName != null) {
      result.append("  Local Name: " + localName + "\r\n");
    }
    if (prefix != null) {
      result.append("  Prefix: " + prefix + "\r\n");
    }
    if (uri != null) {
      result.append("  Namespace URI: " + uri + "\r\n");
    }
    if (value != null) {
      result.append("  Value: " + value + "\r\n");
    }
    
    out.write(result.toString());
    out.write("\r\n");
    out.flush();
    
    nodeCount++;
    
  }

}