| /* |
| * 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 javax.persistence.Parameter; |
| |
| /** |
| * A user-defined parameter of a query. |
| * |
| * A parameter is uniquely identified within the scope of a query by either |
| * its name or integral position. The integral position refers to the integer |
| * key as specified by the user. The index of this parameter during execution |
| * in a datastore query may be different. |
| * <br> |
| * A value can be bound to this parameter. This behavior of a parameter carrying |
| * its own value is a change from earlier versions (where no explicit abstraction |
| * existed for a query parameter). |
| * |
| * @author Pinaki Poddar |
| * |
| * @since 2.0.0 |
| * |
| * @param <T> type of value carried by this parameter. |
| * |
| */ |
| public class ParameterImpl<T> implements Parameter<T> { |
| private final String _name; |
| private final Integer _position; |
| private final Class<T> _expectedValueType; |
| |
| /** |
| * Construct a positional parameter with the given position as key and |
| * given expected value type. |
| */ |
| public ParameterImpl(Integer position, Class<T> expectedValueType) { |
| _name = null; |
| _position = position; |
| _expectedValueType = expectedValueType; |
| } |
| |
| /** |
| * Construct a named parameter with the given name as key and |
| * given expected value type. |
| */ |
| public ParameterImpl(String name, Class<T> expectedValueType) { |
| _name = name; |
| _position = null; |
| _expectedValueType = expectedValueType; |
| } |
| |
| public final String getName() { |
| return _name; |
| } |
| |
| public final Integer getPosition() { |
| return _position; |
| } |
| |
| public Class<T> getParameterType() { |
| return _expectedValueType; |
| } |
| |
| /** |
| * Equals if the other parameter has the same name or position. |
| */ |
| @Override |
| public boolean equals(Object other) { |
| if (this == other) |
| return true; |
| if (!(other instanceof Parameter)) |
| return false; |
| Parameter<?> that = (Parameter<?>)other; |
| if (_name != null) |
| return _name.equals(that.getName()); |
| if (_position != null) |
| return _position.equals(that.getPosition()); |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return _expectedValueType.hashCode() ^ ((_name != null) ? _name.hashCode() : 0) |
| ^ ((_position != null) ? _position.hashCode() : 0); |
| } |
| |
| public String toString() { |
| StringBuilder buf = new StringBuilder("Parameter"); |
| buf.append("<" + getParameterType().getSimpleName() + ">"); |
| if (_name != null) { |
| buf.append("('" + _name + "')"); |
| } else if (_position != null) { |
| buf.append("(" + _position + ")"); |
| } else { |
| buf.append("(?)"); |
| } |
| |
| return buf.toString(); |
| } |
| |
| } |