| /* |
| * 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.kernel.exps; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| import org.apache.openjpa.kernel.StoreContext; |
| |
| /** |
| * Any contains(var) expression must be followed by at least one |
| * AND clause using the variable 'var'. This expression type represents |
| * one of those and AND clauses. It is responsible for evaluating the |
| * right subexpression for every possible value of the variable. |
| * |
| * @author Abe White |
| */ |
| class BindVariableAndExpression |
| extends AndExpression { |
| |
| /** |
| * Constructor. Provide expression binding the variable and the |
| * expression it is AND'd with. |
| */ |
| public BindVariableAndExpression(BindVariableExpression var, Exp exp) { |
| super(var, exp); |
| } |
| |
| protected boolean eval(Object candidate, Object orig, |
| StoreContext ctx, Object[] params) { |
| // execute the tree for every element in the variable's collection; |
| // the variable is aliased to the current element before each |
| // iteration so that variable paths within the tree can |
| // use the current value; the expression is true if true for any |
| // value of the collection |
| |
| // if the collection is empty it cannot contain any variable |
| BindVariableExpression bind = (BindVariableExpression) |
| getExpression1(); |
| Collection vals = bind.getVariableValues(candidate, orig, ctx, |
| params); |
| if (vals == null || vals.isEmpty()) |
| return false; |
| |
| // the subtree is true if true for any variable in the collection |
| BoundVariable var = bind.getVariable(); |
| for (Iterator itr = vals.iterator(); itr.hasNext();) { |
| if (!var.setValue(itr.next())) |
| continue; |
| if (getExpression2().evaluate(candidate, orig, ctx, params)) |
| return true; |
| } |
| return false; |
| } |
| |
| protected boolean eval(Collection candidates, StoreContext ctx, |
| Object[] params) { |
| if (candidates == null || candidates.isEmpty()) |
| return false; |
| Object obj = candidates.iterator().next(); |
| return eval(obj, obj, ctx, params); |
| } |
| } |