com.avaje.ebeaninternal.server.deploy.ChainedBeanQueryAdapter Maven / Gradle / Ivy
package com.avaje.ebeaninternal.server.deploy;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import com.avaje.ebean.event.BeanQueryAdapter;
import com.avaje.ebean.event.BeanQueryRequest;
/**
* Handles multiple BeanQueryAdapter for a given entity type.
*/
public class ChainedBeanQueryAdapter implements BeanQueryAdapter {
private static final Sorter SORTER = new Sorter();
private final List list;
private final BeanQueryAdapter[] chain;
/**
* Construct given the list of BeanQueryAdapter's.
*/
public ChainedBeanQueryAdapter(List list) {
this.list = list;
BeanQueryAdapter[] c = list.toArray(new BeanQueryAdapter[list.size()]);
Arrays.sort(c, SORTER);
this.chain = c;
}
/**
* Register a new BeanQueryAdapter and return the resulting chain.
*/
public ChainedBeanQueryAdapter register(BeanQueryAdapter c) {
if (list.contains(c)){
return this;
} else {
List newList = new ArrayList();
newList.addAll(list);
newList.add(c);
return new ChainedBeanQueryAdapter(newList);
}
}
/**
* De-register a BeanQueryAdapter and return the resulting chain.
*/
public ChainedBeanQueryAdapter deregister(BeanQueryAdapter c) {
if (!list.contains(c)){
return this;
} else {
ArrayList newList = new ArrayList();
newList.addAll(list);
newList.remove(c);
return new ChainedBeanQueryAdapter(newList);
}
}
/**
* Return 0 as not used by this Chained adapter.
*/
public int getExecutionOrder() {
return 0;
}
/**
* Return false as only individual adapters are registered.
*/
public boolean isRegisterFor(Class cls) {
return false;
}
public void preQuery(BeanQueryRequest request) {
for (int i = 0; i < chain.length; i++) {
chain[i].preQuery(request);
}
}
/**
* Helper to order the BeanQueryAdapter's in a chain.
*/
private static class Sorter implements Comparator {
public int compare(BeanQueryAdapter o1, BeanQueryAdapter o2) {
int i1 = o1.getExecutionOrder() ;
int i2 = o2.getExecutionOrder() ;
return (i1