Java 版本的 php strtr 函数 ( replace 是 Map<String, String> 模拟的关联数组 ) / Java version of php "strtr" function

Strtr.java

package fuck.you.java;

import java.util.*;

public class Strtr {
	/*
	 from php strtr
	 */
	static public String strtr(String str, Map<String, String> replace_arr) {
		int maxlen = 0; int minlen = 1024*128;
	    if ( replace_arr == null || replace_arr.size() == 0 ) return str;
	    for(String key : replace_arr.keySet()) {
	    	int len = key.length();
	    	if( len < 1 ) continue;
	    	if( len > maxlen ) maxlen = len;
	    	if( len < minlen ) minlen = len;
	    }
	    int len = str.length();
	    int pos = 0; String result = "";
	    
	    while( pos < len ) {
	    	if( pos + maxlen > len ) maxlen = len - pos;
	    	boolean found = false; String key = "";
	    	for(int i = 0; i < maxlen; ++i) key += str.charAt(i + pos);
	    	for(int i = maxlen; i >= minlen; --i) {
	    		String key1 = key.substring(0, i);
	    		if( replace_arr.containsKey(key1) ) {
	    			result += replace_arr.get(key1);
	    			pos += i;
	    			found = true;
	    			break;
	    		}
	    	}
	    	if( ! found ) result += str.charAt(pos++);
	    }
	    return result;
	}
}