| /* |
| * 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.criteria; |
| |
| import java.util.Collection; |
| |
| import javax.persistence.criteria.ParameterExpression; |
| |
| import org.apache.openjpa.kernel.exps.ExpressionFactory; |
| import org.apache.openjpa.kernel.exps.Value; |
| import org.apache.openjpa.lib.util.OrderedMap; |
| import org.apache.openjpa.util.InternalException; |
| |
| /** |
| * Parameter of a criteria query. |
| * <br> |
| * A parameter in CriteriaQuery is always a named parameter but can be constructed with a null name. |
| * Positional parameters are not allowed in CriteraQuery. |
| * <br> |
| * |
| * @author Pinaki Poddar |
| * @author Fay wang |
| * |
| * @param <T> the type of value held by this parameter. |
| */ |
| class ParameterExpressionImpl<T> extends ExpressionImpl<T> |
| implements ParameterExpression<T>, BindableParameter { |
| private String _name; |
| private int _index = 0; // index of the parameter as seen by the kernel, not position |
| private Object value; |
| |
| /** |
| * Construct a Parameter of given expected value type and name. |
| * |
| * @param cls expected value type |
| * @param name name of the parameter which can be null. |
| */ |
| public ParameterExpressionImpl(Class<T> cls, String name) { |
| super(cls); |
| if (name != null) |
| assertValidName(name); |
| _name = name; |
| } |
| |
| /** |
| * Gets the name of this parameter. |
| * The name can be null. |
| */ |
| @Override |
| public final String getName() { |
| return _name; |
| } |
| |
| /** |
| * Raises an internal exception because parameters of CriteriaQuery |
| * are not positional. |
| */ |
| @Override |
| public final Integer getPosition() { |
| throw new InternalException(this + " must not be asked for its position"); |
| } |
| |
| void setIndex(int index) { |
| _index = index; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder buf = new StringBuilder("ParameterExpression"); |
| buf.append("<" + getJavaType().getSimpleName() + ">"); |
| if (_name != null) |
| buf.append("('"+ _name +"')"); |
| |
| return buf.toString(); |
| } |
| |
| @Override |
| public void setValue(Object value) { |
| this.value = value; |
| } |
| |
| @Override |
| public Object value() { |
| return value; |
| } |
| |
| @Override |
| public Value toValue(ExpressionFactory factory, CriteriaQueryImpl<?> q) { |
| Class<?> clzz = getJavaType(); |
| Object paramKey = _name == null ? _index : _name; |
| boolean isCollectionValued = Collection.class.isAssignableFrom(clzz); |
| org.apache.openjpa.kernel.exps.Parameter param = isCollectionValued |
| ? factory.newCollectionValuedParameter(paramKey, clzz) |
| : factory.newParameter(paramKey, clzz); |
| |
| int index = _name != null |
| ? findIndexWithSameName(q) |
| : _index; |
| param.setIndex(index); |
| |
| return param; |
| } |
| |
| private int findIndexWithSameName(CriteriaQueryImpl<?> q) { |
| OrderedMap<Object, Class<?>> parameterTypes = q.getParameterTypes(); |
| int i = 0; |
| for (Object k : parameterTypes.keySet()) { |
| if (paramEquals(k)) { |
| return i; |
| } |
| i++; |
| } |
| return -1; |
| } |
| |
| @Override |
| public StringBuilder asValue(AliasContext q) { |
| return Expressions.asValue(q, ":", _name == null ? "param" : _name); |
| } |
| |
| @Override |
| public Class<T> getParameterType() { |
| return getJavaType(); |
| } |
| |
| public boolean paramEquals(Object o) { |
| if (this == o) |
| return true; |
| |
| if (o == null || getClass() != o.getClass()) |
| return false; |
| |
| ParameterExpressionImpl<?> that = (ParameterExpressionImpl<?>) o; |
| |
| if (_name != null ? !_name.equals(that._name) : that._name != null) |
| return false; |
| |
| // if name is given, then we ignore the index |
| if (_name == null && _index != that._index) |
| return false; |
| |
| if (getParameterType() != ((ParameterExpressionImpl<?>) o).getParameterType() ) |
| return false; |
| |
| return value != null ? value.equals(that.value) : that.value == null; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return super.hashCode(); |
| } |
| } |