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index.zulzul<zk>
<window border="normal" title="hello"
<div>It's impossible to demonstrat the effect in Fiddle, please copy the code to your project and use it.</div>
</window>
</zk>
ConsistentIdGenerator.javajavaimport java.util.LinkedList;
import java.util.concurrent.atomic.AtomicInteger;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Desktop;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.ext.Scope;
import org.zkoss.zk.ui.sys.IdGenerator;
/**
*
* @author Ian Tsai (zanyking)
*
*/
public class ConsistentIdGenerator implements IdGenerator {
private static final AtomicInteger DESKTOP_ID_AINT = new AtomicInteger();
private final IdGenerator innerIdGenerator;
/**
* key="USE_TEST_COMP_UUID_GENERATOR", valueType=boolean
*/
public ConsistentIdGenerator(){
String useTesting = System.getProperty("USE_TEST_COMP_UUID_GENERATOR");
Boolean isUnderTesting = Boolean.FALSE;
if(useTesting!=null){
try{
isUnderTesting = Boolean.parseBoolean(useTesting);
}catch(Exception e){
//ignore, nothing need to do.
}
}
if(isUnderTesting){
innerIdGenerator = new TestingIdGenerator();
}else{
innerIdGenerator = new ProductionIdGenerator();
}
}
public String nextComponentUuid(Desktop arg0, Component arg1) {
return innerIdGenerator.nextComponentUuid(arg0, arg1);
}
public String nextDesktopId(Desktop arg0) {
return innerIdGenerator.nextDesktopId(arg0);
}
public String nextPageUuid(Page arg0) {
return innerIdGenerator.nextPageUuid(arg0);
}
private static final String CHAR = "0123456789abcdefghijklmnopqrstuvwxyz";
private static final char[] CHAR_ARR =CHAR.toCharArray();
private static String encodeRadix36(int in){
StringBuffer sb = new StringBuffer(4);
// almost impossible for a desktop to contain more than 10,000 components.
int inp = in,k,i;
do{
k = inp /CHAR_ARR.length;
i = inp % CHAR_ARR.length;
sb.append(CHAR_ARR[i]);
inp = k;
}
while(k>0);
return sb.reverse().toString();
}
private static int getAndIncrement(Scope scope, String key){
AtomicInteger aInt = (AtomicInteger) scope.getAttribute(key);
if (aInt == null) {
scope.setAttribute(key, aInt = new AtomicInteger());
}
int i = aInt.getAndIncrement();
return i;
}
/**
*
* @author Ian Tsai(ytsai1)
*
*/
static class ProductionIdGenerator implements IdGenerator{
private final static String ID_NUMBER = "zk_id_num";
public String nextComponentUuid(Desktop desktop, Component comp) {
String key = ID_NUMBER + comp.getClass().getSimpleName();
int i = getAndIncrement(desktop, key);
String compId = "zc_" + comp.getClass().getSimpleName() +"_"+ i;
return compId;
}
public String nextDesktopId(Desktop desktop) {
int i = DESKTOP_ID_AINT.getAndIncrement();
String dtid = "Desktop_" + i;
((javax.servlet.http.HttpServletResponse)Executions.getCurrent().getNativeResponse()).setHeader("Desktop", dtid);
return dtid;
}
public String nextPageUuid(Page page) {
return null;
}
}//end of class
/**
*
* @author Ian Tsai(ytsai1)
*
*/
static class TestingIdGenerator implements IdGenerator{
private static final String KEY_GENERIC_SHORT_NAME = "KEY_GENERIC_SHORT_NAME";
private final static String KEY_UUID_ATOMIC_INT = "KEY_UUID_ATOMIC_INT";
/*
* (non-Javadoc)
* @see org.zkoss.zk.ui.sys.IdGenerator#nextComponentUuid(org.zkoss.zk.ui.Desktop, org.zkoss.zk.ui.Component)
*/
public String nextComponentUuid(Desktop desktop, Component comp) {
Page page = comp.getPage();
Scope scope = page==null? desktop : page;
String pageUuid = page==null? "pseudo_page" : page.getUuid();
String prefix = enc(comp.getClass().getSimpleName(),
enc(pageUuid, "zc_", desktop, false), desktop, false);
String uuid = prefix + encodeRadix36(getAndIncrement(scope, KEY_UUID_ATOMIC_INT));
return uuid;
}
/*
* (non-Javadoc)
* @see org.zkoss.zk.ui.sys.IdGenerator#nextDesktopId(org.zkoss.zk.ui.Desktop)
*/
public String nextDesktopId(Desktop desktop) {
int i = DESKTOP_ID_AINT.getAndIncrement();
String dtid = "Desktop_" + i;
((javax.servlet.http.HttpServletResponse)Executions.getCurrent().getNativeResponse()).setHeader("Desktop", dtid);
return dtid;
}
/*
* (non-Javadoc)
* @see org.zkoss.zk.ui.sys.IdGenerator#nextPageUuid(org.zkoss.zk.ui.Page)
*/
public String nextPageUuid(Page page) {
return null;
}
/**
*
* @param name
* @param prefix
* @param scope
* @return
*/
private static String enc(String name, String prefix, Scope scope, boolean disable){
if(disable){
return prefix+name+"_";
}
StatefulIdEncoder idEncoder = (StatefulIdEncoder) scope.getAttribute(KEY_GENERIC_SHORT_NAME);
if (idEncoder == null) {
scope.setAttribute(KEY_GENERIC_SHORT_NAME,
idEncoder = new StatefulIdEncoder());
}
return prefix+idEncoder.encode(name)+"_";
}
/**
* @author ytsai1
*/
private static class StatefulIdEncoder{
final LinkedList<String> store = new LinkedList<String>();
/**
* @param name
* @return
*/
public String encode(String name){
if(name==null || name.isEmpty())
throw new IllegalArgumentException("StatefulIdEncoder can't encode a null or empty String: "+name);
int counter = 0;
int idx = -1;
for(String temp : store){
if(temp.equals(name)){
idx = counter;
break;
}
counter++;
}
if(idx<0){//if not exist
store.add(name);
return encodeRadix36(counter);
}else{// it's exist
return encodeRadix36(idx);
}
}
}
}//end of class...
}