001    /*
002     * Copyright 2010-2015 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.kotlin.resolve.calls.model;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.kotlin.psi.Call;
022    import org.jetbrains.kotlin.psi.ValueArgument;
023    import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo;
024    
025    import java.util.HashMap;
026    import java.util.Iterator;
027    import java.util.List;
028    import java.util.Map;
029    
030    public class DataFlowInfoForArgumentsImpl extends MutableDataFlowInfoForArguments {
031        @Nullable private Map<ValueArgument, DataFlowInfo> infoMap = null;
032        @Nullable private Map<ValueArgument, ValueArgument> nextArgument = null;
033        @Nullable private DataFlowInfo resultInfo;
034    
035        public DataFlowInfoForArgumentsImpl(@NotNull DataFlowInfo initialInfo, @NotNull Call call) {
036            super(initialInfo);
037            initNextArgMap(call.getValueArguments());
038        }
039    
040        private void initNextArgMap(@NotNull List<? extends ValueArgument> valueArguments) {
041            Iterator<? extends ValueArgument> iterator = valueArguments.iterator();
042            ValueArgument prev = null;
043            while (iterator.hasNext()) {
044                ValueArgument argument = iterator.next();
045                if (prev != null) {
046                    if (nextArgument == null) {
047                        nextArgument = new HashMap<ValueArgument, ValueArgument>();
048                    }
049                    nextArgument.put(prev, argument);
050                }
051                prev = argument;
052            }
053        }
054    
055        @NotNull
056        @Override
057        public DataFlowInfo getInfo(@NotNull ValueArgument valueArgument) {
058            DataFlowInfo infoForArgument = infoMap == null ? null : infoMap.get(valueArgument);
059            if (infoForArgument == null) {
060                return initialDataFlowInfo;
061            }
062            return initialDataFlowInfo.and(infoForArgument);
063        }
064    
065        @Override
066        public void updateInfo(@NotNull ValueArgument valueArgument, @NotNull DataFlowInfo dataFlowInfo) {
067            ValueArgument next = nextArgument == null ? null : nextArgument.get(valueArgument);
068            if (next != null) {
069                if (infoMap == null) {
070                    infoMap = new HashMap<ValueArgument, DataFlowInfo>();
071                }
072                infoMap.put(next, dataFlowInfo);
073                return;
074            }
075            //TODO assert resultInfo == null
076            resultInfo = dataFlowInfo;
077        }
078    
079        @NotNull
080        @Override
081        public DataFlowInfo getResultInfo() {
082            if (resultInfo == null) return initialDataFlowInfo;
083            return initialDataFlowInfo.and(resultInfo);
084        }
085    }