attribvaluepair.java

真正的网络爬虫的源代码啊,希望大家好好阅读,写出心得体会啊

package net.matuschek.util;

import java.net.URLEncoder;
/*********************************************
    Copyright (c) 2001 by Daniel Matuschek
*********************************************/
            

/**
 * A simple class to store attribute value pairs
 *
 * @author Daniel Matuschek
 * @version $Id: AttribValuePair.java,v 1.4 2002/05/31 14:45:56 matuschd Exp $*/
public class AttribValuePair {

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

  public boolean getIgnoreAttribCase() {
    return ignoreAttribCase;
  }

  /**
   * empty constructor that does nothing
   */
  public AttribValuePair() {
  }


  /**
   * initializes object using an attribute and its values
   */
  public AttribValuePair(String attrib, String value) {
    this.attrib=attrib;
    this.value=value;
  }

  /**
   * inializes object using attrib=value string
   */
  public AttribValuePair(String attribAndValue) {
    setAttribAndValue(attribAndValue);
  }

  /**
   * set the attrib and value using an attrib=value string
   */
  protected void setAttribAndValue(String attribAndValue) {
    int pos=0;
    pos=attribAndValue.indexOf("=");
    if (pos==-1) {
      attrib=attribAndValue;
    } else {
      attrib=attribAndValue.substring(0,pos).trim();
      value=attribAndValue.substring(pos+1).trim();
      if (value.startsWith("\"") || value.startsWith("'")) {
	value=value.substring(1);
      }
      if (value.endsWith("\"") || value.endsWith("'")) {
	value=value.substring(0,value.length()-1);
      }
    }
  }
  
  public String getAttrib() { 
    if (ignoreAttribCase) {
      return attrib.toLowerCase();
    } else {
      return attrib;
    }
  }
  
  public String getValue() { 
    return value; 
  }

  public String toEncodedString() {
    return 
      URLEncoder.encode(attrib)+
      "="+
      URLEncoder.encode(value);
  }

  public String toString() {
    return attrib+"=\""+value+"\"";
  }
  
  private String attrib;
  private String value;
  private boolean ignoreAttribCase=false;
}