BSONProperty.java

/**
 * Copyright (c) 2011, Thilo Planz. All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package v7cr.vaadin;

import java.util.Map;

import org.bson.BSONObject;

import com.vaadin.data.util.AbstractProperty;

@SuppressWarnings("serial")
public class BSONProperty extends AbstractProperty {

	private final BSONObject bson;

	private final String fieldName;

	public BSONProperty(BSONObject bson, String fieldName) {
		this.bson = bson;
		this.fieldName = fieldName;
	}

	public Class<?> getType() {
		return getValue().getClass();
	}

	// for nested fields
	// returns { parentObject, localFieldName }

	private static Object[] drillDownToParent(Map<?, ?> data, String field) {
		if (field == null) {
			return null;
		}
		int idx = field.indexOf('.');
		if (idx == -1) {
			return new Object[] { data, field };
		}
		String head = field.substring(0, idx);
		String tail = field.substring(idx + 1);
		Object o = data.get(head);
		if (o instanceof Map<?, ?>) {
			return drillDownToParent((Map<?, ?>) o, tail);
		}
		return null;
	}

	// for nested fields
	private Object drillDown(String field) {
		Object[] d = drillDownToParent((Map<?, ?>) bson, field);
		if (d == null)
			return null;
		return ((Map<?, ?>) d[0]).get(d[1]);
	}

	public Object getValue() {
		return drillDown(fieldName);
	}

	public void setValue(Object newValue) throws ReadOnlyException,
			ConversionException {
		if (fieldName.contains("."))
			throw new ReadOnlyException(fieldName);
		bson.put(fieldName, newValue);
	}

	@Override
	public String toString() {
		Object x = getValue();
		if (x == null)
			return null;
		return x.toString();
	}

}