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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.core.data;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.eclipse.osee.framework.core.exception.ItemDoesNotExist;
import org.eclipse.osee.framework.core.exception.MultipleItemsExist;
import org.eclipse.osee.framework.jdk.core.type.OseeCoreException;
/**
* @author Roberto E. Escobar
*/
public class ResultSetList<T> implements ResultSet<T> {
private final List<T> data;
public ResultSetList() {
super();
this.data = Collections.emptyList();
}
public ResultSetList(List<T> data) {
super();
this.data = data;
}
@Override
public T getOneOrNull() {
List<T> result = getList();
return result.isEmpty() ? null : result.iterator().next();
}
@Override
public T getAtMostOneOrNull() throws OseeCoreException {
List<T> result = getList();
if (result.size() > 1) {
throw createManyExistException(result.size());
}
return result.isEmpty() ? null : result.iterator().next();
}
@Override
public T getExactlyOne() throws OseeCoreException {
T result = getAtMostOneOrNull();
if (result == null) {
throw createDoesNotExistException();
}
return result;
}
private List<T> getList() {
return data;
}
@Override
public Iterator<T> iterator() {
return getList().iterator();
}
protected OseeCoreException createManyExistException(int count) {
return new MultipleItemsExist("Multiple items found - total [%s]", count);
}
protected OseeCoreException createDoesNotExistException() {
return new ItemDoesNotExist("No item found");
}
@Override
public int size() {
return data.size();
}
@Override
public boolean isEmpty() {
return data.isEmpty();
}
}
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