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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.pagetemplates.model;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* A choice between different possible mapping functions of a set of values to a set of placeholder ids.
* A <i>resolution</i> of this choice consists of choosing a unique value for each placeholder id
* (hence a map choice is valid iff there are at least as many values as placeholder ids).
* <p>
* Each unique set of mappings (pairs) from values to placeholder ids is a separate possible
* alternative of this choice. The alternatives are not listed explicitly but are generated as needed.
*
* @author bratseth
*/
public class MapChoice extends AbstractChoice {
private List<String> placeholderIds=new ArrayList<>();
private List<List<PageElement>> values=new ArrayList<>();
@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public boolean isChoiceBetween(Class pageTemplateModelElementClass) {
List<PageElement> firstNonEmpty=null;
for (List<PageElement> value : values)
if (value.size()>0)
firstNonEmpty=value;
if (firstNonEmpty==null) return false;
return (pageTemplateModelElementClass.isAssignableFrom(firstNonEmpty.get(0).getClass()));
}
/**
* Returns the placeholder ids (the "to" of the mapping) of this as a live reference which can be modified unless
* this is frozen.
*/
public List<String> placeholderIds() { return placeholderIds; }
/**
* Returns the values (the "from" of the mapping) of this as a live reference which can be modified unless
* this is frozen. Note that each single choice of values within this is also a list of values. This is
* the inner list.
*/
public List<List<PageElement>> values() { return values; }
@Override
public void freeze() {
if (isFrozen()) return;
super.freeze();
placeholderIds=Collections.unmodifiableList(placeholderIds);
values=Collections.unmodifiableList(values);
}
/** Accepts a visitor to this structure */
@Override
public void accept(PageTemplateVisitor visitor) {
visitor.visit(this);
for (List<PageElement> valueEntry : values)
for (PageElement value : valueEntry)
value.accept(visitor);
}
@Override
public String toString() {
return "mapping to placeholders " + placeholderIds;
}
}
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