io.pelle.mango.client.base.vo.VOEntityMetadata Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of mango-client-base Show documentation
mango web framework
The newest version!
package io.pelle.mango.client.base.vo;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;

public class VOEntityMetadata implements IVOEntityMetadata, Serializable {

	private static final long serialVersionUID = -7165340661545211047L;

	private List listChangeTrackers = new ArrayList();

	private Map changes = new HashMap();

	private List loadedAttributes = new ArrayList();

	private boolean trackLoadedAttributes = true;

	private IVOEntity voEntity;

	@SuppressWarnings("unused")
	private VOEntityMetadata() {
	}

	public VOEntityMetadata(IVOEntity voEntity, boolean trackLoadedAttributes) {
		this.voEntity = voEntity;
		this.trackLoadedAttributes = trackLoadedAttributes;
	}

	public Map getChanges() {
		return changes;
	}

	public void setChanges(Map changes) {
		this.changes = changes;
	}

	public void addChange(String attributeName, Object value) {
		this.changes.put(attributeName, value);
	}

	@Override
	public void setLoaded(String attributeName) {
		loadedAttributes.add(attributeName);
	}

	public void checkLoaded(String attributeName) {

		if (trackLoadedAttributes && loadedAttributes != null && !voEntity.isNew() && !loadedAttributes.contains(attributeName)) {
			throw new RuntimeException("attribute '" + attributeName + "' is not loaded for class '" + voEntity.getClass() + "'");
		}
	}

	@Override
	public boolean hasChanges() {
		return !this.changes.isEmpty() || Iterables.any(listChangeTrackers, new Predicate() {

			@Override
			public boolean apply(IChangeTracker input) {
				return input.hasChanges();
			}
		});
	}

	@Override
	public void clearChanges() {
		this.changes.clear();
	}

	@Override
	public void copyChanges(IChangeTracker source) {
		this.changes = new HashMap(((VOEntityMetadata) source).changes);
		this.loadedAttributes = new ArrayList(((VOEntityMetadata) source).loadedAttributes);
		this.trackLoadedAttributes = ((VOEntityMetadata) source).trackLoadedAttributes;
	}

	public void addListChangeTracker(IChangeTracker listChangeTracker) {
		listChangeTrackers.add(listChangeTracker);
	}

	@Override
	public boolean isLoaded(String attributeName) {
		return !trackLoadedAttributes || loadedAttributes.contains(attributeName);
	}

}