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/*
 * Copyright (c) 2016 simplity.org
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.simplity.kernel.data;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.simplity.kernel.value.Value;

/**
 * represents a fields collection internally, but implements all methods of a data sheet.
 * This is to be used when you are likely to add/remove fields, and if used as a row of data, the order of the columns is not important.
 *
 * @author simplity.org
 *
 */
public class Fields implements FieldsInterface {
	private final Map fieldValues = new HashMap();
	

	@Override
	public Value getValue(String fieldName) {
		return this.fieldValues.get(fieldName);
	}

	@Override
	public void setValue(String fieldName, Value value) {
		if (value == null) {
			this.fieldValues.remove(fieldName);
		} else {
			this.fieldValues.put(fieldName, value);
		}
	}

	@Override
	public boolean hasValue(String fieldName) {
		return this.fieldValues.containsKey(fieldName);
	}

	@Override
	public Value removeValue(String fieldName) {
		return this.fieldValues.remove(fieldName);
	}

	@Override
	public Set> getAllFields() {
		return this.fieldValues.entrySet();
	}
}