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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.pagetemplates;
import com.yahoo.search.pagetemplates.model.*;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Creates a map from placeholder id to the choice providing its value
* for all placeholder values visited.
* <p>
* This visitor will throw an IllegalArgumentException if the same placeholder id
* is referenced by two choices.
*
* @author bratseth
*/
class PlaceholderMappingVisitor extends PageTemplateVisitor {
private final Map<String, MapChoice> placeholderIdToChoice = new LinkedHashMap<>();
@Override
public void visit(MapChoice mapChoice) {
List<String> placeholderIds = mapChoice.placeholderIds();
for (String placeholderId : placeholderIds) {
MapChoice existingChoice = placeholderIdToChoice.put(placeholderId,mapChoice);
if (existingChoice != null)
throw new IllegalArgumentException("placeholder id '" + placeholderId + "' is referenced by both " +
mapChoice + " and " + existingChoice + ": Only one reference is allowed");
}
}
public Map<String, MapChoice> getMap() { return placeholderIdToChoice; }
}
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