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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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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 {
public 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.size() == 0) {
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;
}
}
// first 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);
// return actualParameterTypes.get(actualParameterTypes.size() - 1);
}
@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;
}
}
}