io.ebeaninternal.server.deploy.ChainedBeanQueryAdapter Maven / Gradle / Ivy

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composite of common runtime dependencies for all platforms

There is a newer version: 15.8.1

package io.ebeaninternal.server.deploy;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

import io.ebean.event.BeanQueryAdapter;
import io.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 (BeanQueryAdapter aChain : chain) {
      aChain.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