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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.debug;
import com.yahoo.component.chain.Chain;
import com.yahoo.search.Searcher;
import com.yahoo.search.searchchain.ForkingSearcher;
import com.yahoo.search.searchchain.SearchChain;
import com.yahoo.search.searchchain.SearchChainRegistry;
import java.util.Collection;
/**
* Text representation of a given search chain intended for debugging purposes.
*
* @author tonytv
*/
public class SearchChainTextRepresentation {
private final SearchChainRegistry searchChainRegistry;
private static class Block {
private static final String openBlock = " {";
private static final char closeBlock = '}';
private final IndentStringBuilder str;
private final int level;
Block(IndentStringBuilder str) {
this.str = str;
level = str.append(openBlock).newlineAndIndent();
}
void close() {
str.resetIndentLevel(level);
str.append(closeBlock).newline();
}
}
private final String textRepresentation;
private void outputChain(IndentStringBuilder str, Chain<Searcher> chain) {
if (chain == null) {
str.append(" [Unresolved Searchchain]");
} else {
str.append(chain.getId()).append(" [Searchchain] ");
Block block = new Block(str);
for (Searcher searcher : chain.components())
outputSearcher(str, searcher);
block.close();
}
}
private void outputSearcher(IndentStringBuilder str, Searcher searcher) {
str.append(searcher.getId()).append(" [Searcher]");
if ( ! (searcher instanceof ForkingSearcher) ) {
str.newline();
return;
}
Collection<ForkingSearcher.CommentedSearchChain> chains =
((ForkingSearcher)searcher).getSearchChainsForwarded(searchChainRegistry);
if (chains.isEmpty()) {
str.newline();
return;
}
Block block = new Block(str);
for (ForkingSearcher.CommentedSearchChain chain : chains) {
if (chain.comment != null)
str.append(chain.comment).newline();
outputChain(str, chain.searchChain);
}
block.close();
}
@Override
public String toString() {
return textRepresentation;
}
public SearchChainTextRepresentation(SearchChain searchChain, SearchChainRegistry searchChainRegistry) {
this.searchChainRegistry = searchChainRegistry;
IndentStringBuilder stringBuilder = new IndentStringBuilder();
outputChain(stringBuilder, searchChain);
textRepresentation = stringBuilder.toString();
}
}
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