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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;
/**
* A source placeholder is replaced with a list of source instances at evaluation time.
* Source placeholders may not have any content themselves - attempting to call any setter on this
* results in a IllegalStateException.
*
* @author bratseth
*/
public class Placeholder implements PageElement {
private String id;
private MapChoice valueContainer=null;
/** Creates a source placeholder with an id. */
public Placeholder(String id) {
this.id=id;
}
public String getId() { return id; }
/** Returns the element which contains the value(s) of this placeholder. Never null. */
public MapChoice getValueContainer() { return valueContainer; }
public void setValueContainer(MapChoice valueContainer) { this.valueContainer=valueContainer; }
@Override
public void freeze() {}
/** Accepts a visitor to this structure */
@Override
public void accept(PageTemplateVisitor visitor) {
visitor.visit(this);
}
@Override
public String toString() {
return "source placeholder '" + id + "'";
}
/**
* This method always returns false, is a Placeholder always is mutable.
* (freeze() is a NOOP.)
*/
@Override
public boolean isFrozen() {
return false;
}
}
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