| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.openjpa.persistence; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import javax.persistence.Tuple; |
| import javax.persistence.TupleElement; |
| import javax.persistence.criteria.Selection; |
| |
| import org.apache.openjpa.kernel.ObjectFactory; |
| |
| |
| /** |
| * A factory for tuples such that all instances created by a factory instance share the same TupleElements |
| * to save memory consumption. |
| * <BR> |
| * All Tuple instances created by this factory access the TupleElememts contained in this factory. |
| * |
| * @author Pinaki Poddar |
| * |
| * @since 2.0.0 |
| * |
| */ |
| public class TupleFactory implements ObjectFactory<Tuple> { |
| private final List<TupleElement<?>> elements; |
| |
| /** |
| * A factory of Tuple that shares the given TupleElements. |
| * |
| */ |
| public TupleFactory(List<TupleElement<?>> elems) { |
| elements = Collections.unmodifiableList(elems); |
| } |
| |
| public TupleFactory(TupleElement<?>... elems) { |
| this(Arrays.asList(elems)); |
| } |
| |
| public TupleFactory(Selection<?>... elems) { |
| List<TupleElement<?>> list = new ArrayList<>(); |
| for (Selection<?> s : elems) |
| list.add(s); |
| elements = Collections.unmodifiableList(list); |
| } |
| |
| public List<TupleElement<?>> getElements() { |
| return elements; |
| } |
| |
| @Override |
| public TupleImpl newInstance() { |
| TupleImpl impl = new TupleImpl(this); |
| return impl; |
| } |
| |
| public int getIndex(TupleElement<?> e) { |
| int i = elements.indexOf(e); |
| if (i == -1) |
| throw new IllegalArgumentException("Index " + i + " does not exist"); |
| return i; |
| } |
| |
| public int getIndex(String alias) { |
| if (alias == null) |
| throw new IllegalArgumentException("null alias"); |
| for (int i = 0; i < elements.size(); i++) { |
| TupleElement<?> e = elements.get(i); |
| if (alias.equals(e.getAlias())) |
| return i; |
| } |
| throw new IllegalArgumentException(alias + " not found"); |
| } |
| } |