io.ebeaninternal.server.deploy.ChainedBeanPersistController 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 io.ebean.event.BeanPersistController;
import io.ebean.event.BeanPersistRequest;

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

/**
 * Chains multiple BeanPersistController's together.
 *
 * Used when multiple BeanPersistController register for the same bean type.
 */
public class ChainedBeanPersistController implements BeanPersistController {

	private static final Sorter SORTER = new Sorter();

	private final List list;

	private final BeanPersistController[] chain;

	/**
	 * Construct adding 2 BeanPersistController's.
	 */
	public ChainedBeanPersistController(BeanPersistController c1, BeanPersistController c2) {
		this(addList(c1, c2));
	}

	/**
	 * Helper method used to create a list from 2 BeanPersistController's.
	 */
	private static List addList(BeanPersistController c1, BeanPersistController c2) {
		ArrayList addList = new ArrayList<>(2);
		addList.add(c1);
		addList.add(c2);
		return addList;
	}

	/**
	 * Construct given the list of BeanPersistController's.
	 */
	public ChainedBeanPersistController(List list) {
		this.list = list;
		BeanPersistController[] c = list.toArray(new BeanPersistController[list.size()]);
		Arrays.sort(c, SORTER);
		this.chain = c;
	}

  /**
   * Return the size of the chain.
   */
	protected int size() {
		return chain.length;
	}

	/**
	 * Register a new BeanPersistController and return the resulting chain.
	 */
	public ChainedBeanPersistController register(BeanPersistController c) {
		if (list.contains(c)){
			return this;
		} else {
			ArrayList newList = new ArrayList<>();
			newList.addAll(list);
			newList.add(c);

			return new ChainedBeanPersistController(newList);
		}
	}

	/**
	 * De-register a BeanPersistController and return the resulting chain.
	 */
	public ChainedBeanPersistController deregister(BeanPersistController c) {
		if (!list.contains(c)){
			return this;
		} else {
			ArrayList newList = new ArrayList<>();
			newList.addAll(list);
			newList.remove(c);

			return new ChainedBeanPersistController(newList);
		}
	}

	/**
	 * Always returns 0 (not used for this object).
	 */
  @Override
	public int getExecutionOrder() {
		return 0;
	}

	/**
	 * Always returns false (not used for this object).
	 */
  @Override
	public boolean isRegisterFor(Class cls) {
		return false;
	}

  @Override
	public void postDelete(BeanPersistRequest request) {
    for (BeanPersistController aChain : chain) {
      aChain.postDelete(request);
    }
	}

  @Override
	public void postInsert(BeanPersistRequest request) {
    for (BeanPersistController aChain : chain) {
      aChain.postInsert(request);
    }
	}

  @Override
	public void postUpdate(BeanPersistRequest request) {
    for (BeanPersistController aChain : chain) {
      aChain.postUpdate(request);
    }
	}

	@Override
	public void postSoftDelete(BeanPersistRequest request) {
    for (BeanPersistController aChain : chain) {
      aChain.postSoftDelete(request);
    }
	}

  @Override
	public boolean preDelete(BeanPersistRequest request) {
    for (BeanPersistController aChain : chain) {
      if (!aChain.preDelete(request)) {
        return false;
      }
    }
		return true;
	}

	@Override
	public boolean preSoftDelete(BeanPersistRequest request) {
    for (BeanPersistController aChain : chain) {
      if (!aChain.preSoftDelete(request)) {
        return false;
      }
    }
		return true;
	}

  @Override
	public boolean preInsert(BeanPersistRequest request) {
    for (BeanPersistController aChain : chain) {
      if (!aChain.preInsert(request)) {
        return false;
      }
    }
		return true;
	}

  @Override
	public boolean preUpdate(BeanPersistRequest request) {
    for (BeanPersistController aChain : chain) {
      if (!aChain.preUpdate(request)) {
        return false;
      }
    }
		return true;
	}

	/**
	 * Helper to order the BeanPersistController's in a chain.
	 */
	private static class Sorter implements Comparator {

		public int compare(BeanPersistController o1, BeanPersistController o2) {

			int i1 = o1.getExecutionOrder() ;
			int i2 = o2.getExecutionOrder() ;
			return (i1