DefaultRow.java

/*
 *   Copyright (c) 2007 Mike Heath.  All rights reserved.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */
package org.adbcj.support;

import java.util.AbstractMap;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.adbcj.Field;
import org.adbcj.ResultSet;
import org.adbcj.Row;
import org.adbcj.Value;


public class DefaultRow extends AbstractMap<Object, Value> implements Row {

	private final ResultSet resultSet;
	private final Value[] values;

	private transient Set<java.util.Map.Entry<Object, Value>> entrySet;

	public DefaultRow(ResultSet resultSet, Value... values) {
		this.resultSet = resultSet;
		for (Value value : values) {
			if (value == null) {
				throw new AssertionError("Value cannot be null");
			}
		}
		this.values = values.clone();
	}

	@Override
	public Set<java.util.Map.Entry<Object, Value>> entrySet() {
		if (entrySet == null) {
			Set<java.util.Map.Entry<Object, Value>> set = new HashSet<Entry<Object,Value>>();
			for (Value value : values) {
				set.add(new AbstractMap.SimpleEntry<Object, Value>(value.getField(), value));
			}
			entrySet = Collections.unmodifiableSet(set);
		}
		return entrySet;
	}

	public ResultSet getResultSet() {
		return resultSet;
	}

	@Override
	public int size() {
		return values.length;
	}

	@Override
	public boolean containsKey(Object key) {
		return resultSet.getField(key) != null;
	}

	@Override
	public Value get(Object key) {
		Field field = resultSet.getField(key);
		Value value = values[field.getIndex()];
		return value;
	}

	@Override
	public Value remove(Object key) {
		throw new UnsupportedOperationException("Results set rows are read-only");
	}

	@Override
	public void clear() {
		throw new UnsupportedOperationException("Results set rows are read-only");
	}

	public Value[] getValues() {
		return values.clone();
	}
}