| /******************************************************************************* |
| * 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.olingo.odata2.core.uri.expression; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.olingo.odata2.api.edm.EdmType; |
| |
| public interface ParameterSetCombination { |
| |
| void add(ParameterSet parameterSet); |
| |
| ParameterSet validate(List<EdmType> actualParameterTypes) throws ExpressionParserInternalError; |
| |
| void addFirst(ParameterSet parameterSet); |
| |
| EdmType getReturnType(); |
| |
| public static class PSCflex implements ParameterSetCombination { |
| private List<ParameterSet> combinations = new ArrayList<ParameterSet>(); |
| |
| @Override |
| public void add(final ParameterSet parameterSet) { |
| combinations.add(parameterSet); |
| } |
| |
| @Override |
| public EdmType getReturnType() { |
| int parameterCount = combinations.size(); |
| if (parameterCount == 0) { |
| return null; |
| } |
| |
| if (parameterCount == 1) { |
| return combinations.get(0).getReturnType(); |
| } |
| |
| // There are more than 1 possible return type, check if they are equal, if not return null. |
| EdmType returnType = combinations.get(0).getReturnType(); |
| for (int i = 1; i < parameterCount; i++) { |
| if (returnType != combinations.get(i)) { |
| return null; |
| } |
| } |
| |
| return returnType; |
| |
| } |
| |
| @Override |
| public void addFirst(final ParameterSet parameterSet) { |
| List<ParameterSet> oldCombinations = combinations; |
| combinations = new ArrayList<ParameterSet>(); |
| combinations.add(parameterSet); |
| for (ParameterSet parameterSet1 : oldCombinations) { |
| combinations.add(parameterSet1); |
| } |
| |
| } |
| |
| @Override |
| public ParameterSet validate(final List<EdmType> actualParameterTypes) throws ExpressionParserInternalError { |
| if (combinations.isEmpty()) { |
| return new ParameterSet(null, null); |
| } |
| |
| // first check for exact parameter combination |
| for (ParameterSet parameterSet : combinations) { |
| boolean s = parameterSet.equals(actualParameterTypes, false); |
| if (s) { |
| return parameterSet; |
| } |
| } |
| |
| // second check for parameter combination with promotion |
| for (ParameterSet parameterSet : combinations) { |
| boolean s = parameterSet.equals(actualParameterTypes, true); |
| if (s) { |
| return parameterSet; |
| } |
| } |
| return null; |
| } |
| |
| } |
| |
| public static class PSCReturnTypeEqLastParameter implements ParameterSetCombination { |
| |
| @Override |
| public void add(final ParameterSet parameterSet) { |
| throw new IllegalStateException(); |
| } |
| |
| @Override |
| public void addFirst(final ParameterSet parameterSet) { |
| throw new IllegalStateException(); |
| } |
| |
| @Override |
| public ParameterSet validate(final List<EdmType> actualParameterTypes) throws ExpressionParserInternalError { |
| EdmType xxx = actualParameterTypes.get(actualParameterTypes.size() - 1); |
| return new ParameterSet(xxx, null); |
| } |
| |
| @Override |
| public EdmType getReturnType() { |
| // If the return type is always the type of the last parameter of the actual parameters ( e.g. when using the |
| // method operator) |
| // then the return type can not predicted. |
| return null; |
| } |
| } |
| |
| } |