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Apache Solr (module: core)
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.core;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.function.Predicate;
import org.apache.solr.cluster.api.SimpleMap;
import org.apache.solr.common.ConfigNode;
/** A config node impl which has an overlay */
class OverlaidConfigNode implements ConfigNode {
private final ConfigOverlay overlay;
private final String _name;
private final ConfigNode delegate;
private final OverlaidConfigNode parent;
OverlaidConfigNode(
ConfigOverlay overlay, String name, OverlaidConfigNode parent, ConfigNode delegate) {
this.overlay = overlay;
this._name = name;
this.delegate = delegate;
this.parent = parent;
}
private List path(List path) {
if (path == null) path = new ArrayList<>(5);
try {
if (parent != null) return parent.path(path);
} finally {
path.add(_name);
}
return path;
}
@Override
public ConfigNode get(String name) {
return wrap(delegate.get(name), name);
}
private ConfigNode wrap(ConfigNode n, String name) {
return new OverlaidConfigNode(overlay, name, this, n);
}
@Override
public ConfigNode get(String name, Predicate test) {
return wrap(delegate.get(name, test), name);
}
@Override
public String txt() {
return overlayText(delegate.txt(), null);
}
@Override
public ConfigNode get(String name, int idx) {
return wrap(delegate.get(name, idx), name);
}
@Override
public String name() {
return delegate.name();
}
@Override
public SimpleMap attributes() {
return delegate.attributes();
}
@Override
public boolean exists() {
return delegate.exists();
}
@Override
public String attr(String name) {
return overlayText(delegate.attr(name), name);
}
private String overlayText(String def, String appendToPath) {
List path = path(null);
if (appendToPath != null) path.add(appendToPath);
Object val = overlay.getXPathProperty(path);
return val == null ? def : val.toString();
}
@Override
public void forEachChild(Function fun) {
delegate.forEachChild(fun);
}
}