com.anysoft.util.StringMatcher Maven / Gradle / Ivy
package com.anysoft.util;
import java.util.Vector;
/**
* 简单的字符串匹配器
*
* 有的时候,正则表达式匹配显得过于厚重,我们需要简单的匹配器来提升效率。StringMatcher仅支持*号匹配,适用于大多数场合。
* 例如:
*
* ~~~~~~~~~~~~~~~~~~~~~{.java}
* StringMatcher matcher = new StringMatcher("*.sina.com.cn");
* matcher.match("www.sina.com.cn"); --true
* matcher.match("images.sina.com.cn"); --true
* matcher.match("www.sohu.com.cn"); -- false
* ~~~~~~~~~~~~~~~~~~~~~
*
* @author duanyy
*
*/
public class StringMatcher {
/**
* 字符串模板的段落
*/
protected Vector segments = new Vector();
/**
* 构造函数并编译模板
* @param pattern
*/
public StringMatcher(String pattern){
compile(pattern);
}
/**
* 编译模板,生成段落
* @param pattern 模板
*/
protected void compile(String pattern){
String segment = "";
for (int i = 0 ; i < pattern.length() ; i ++){
if (pattern.charAt(i) == '*'){
if (segment.length() > 0){
segments.add(segment);
segment = "";
}
segments.add("*");
}else{
segment += pattern.charAt(i);
}
}
if (segment.length() > 0){
segments.add(segment);
segment = "";
}
}
/**
* 进行字符串匹配
* @param data 待匹配的数据
* @return 是否匹配
*/
public boolean match(String data){
int current = 0;
boolean any = false;
for (String segment:segments){
if (segment.equals("*")){
any = true;
continue;
}
int found = data.indexOf(segment,current);
boolean matched = any ? found >= current : found == current;
if (!matched){
return false;
}
current = found + segment.length();
any = false;
}
return true;
}
}