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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config;
/**
* A ReferenceNode class represents a reference (that is a config-id)
* in a {@link ConfigInstance}.
*/
public class ReferenceNode extends LeafNode<String> {
public ReferenceNode() {
}
/**
* Creates a new ReferenceNode with the given value.
*
* @param value the value of this ReferenceNode
*/
public ReferenceNode(String value) {
super(true);
this.value = stripQuotes(value);
}
/**
* Returns the value of this reference node. Same as {@link
* #toString()} since the value of a ReferenceNode is a String (but
* implementations in other {@link LeafNode} sub-classes differ).
*
* @return the string representation of this ReferenceNode.
*/
public String value() {
return value;
}
@Override
public String getValue() {
return value();
}
@Override
public String toString() {
return (value == null) ? "(null)" : getValue();
}
@Override
protected boolean doSetValue(String value) {
this.value = stripQuotes(value);
return true;
}
/**
* Overrides {@link Node#postInitialize(String)}
* Checks for ":parent:" values, which will be replaced by the configId.
*
* @param configId the configId of the ConfigInstance that owns (or is) this node
*/
@Override
public void postInitialize(String configId) {
super.postInitialize(configId);
if (":parent:".equals(value())) {
doSetValue(configId);
}
}
/**
* Strips the quotes before or after the value, if present.
*/
static String stripQuotes(String value) {
if (value == null) {
return value;
}
StringBuilder buffer = new StringBuilder(value.trim());
if (buffer.length() > 0 && buffer.charAt(0) == '"') {
buffer.deleteCharAt(0);
}
if (buffer.length() > 0 && buffer.charAt(buffer.length() - 1) == '"') {
buffer.setLength(buffer.length() - 1);
}
return buffer.toString();
}
}
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