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 *  or more contributor license agreements.  See the NOTICE file
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 *  to you under the Apache License, Version 2.0 (the
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package org.apache.cayenne.dbsync.merge;

import java.util.Collection;
import java.util.List;

import org.apache.cayenne.dbsync.merge.factory.MergerTokenFactory;
import org.apache.cayenne.dbsync.merge.token.MergerToken;
import org.apache.cayenne.map.DataMap;

class ChainMerger extends AbstractMerger {

    private final AbstractMerger merger;

    private final AbstractMerger parentMerger;

    ChainMerger(MergerTokenFactory tokenFactory, AbstractMerger merger, AbstractMerger parentMerger) {
        super(tokenFactory);
        this.merger = merger;
        this.parentMerger = parentMerger;
    }

    @Override
    public List createMergeTokens() {
        return createMergeTokens(null, null);
    }

    @Override
    MergerDictionaryDiff createDiff(T unused1, T unused2) {
        MergerDictionaryDiff diff = new MergerDictionaryDiff<>();
        MergerDictionaryDiff parentDiff = parentMerger.getDiff();
        merger.setOriginalDictionary(parentMerger.getOriginalDictionary());
        for(MergerDiffPair pair : parentDiff.getSame()) {
            diff.addAll(merger.createDiff(pair.getOriginal(), pair.getImported()));
        }
        return diff;
    }

    @Override
    Collection createTokensForMissingOriginal(M imported) {
        return merger.createTokensForMissingOriginal(imported);
    }

    @Override
    Collection createTokensForMissingImported(M original) {
        return merger.createTokensForMissingImported(original);
    }

    @Override
    Collection createTokensForSame(MergerDiffPair same) {
        return merger.createTokensForSame(same);
    }
}