| /* |
| * 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.common; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.function.Function; |
| import java.util.function.Predicate; |
| import java.util.function.Supplier; |
| |
| import org.apache.solr.cluster.api.SimpleMap; |
| import org.apache.solr.common.util.WrappedSimpleMap; |
| |
| import static org.apache.solr.common.ConfigNode.Helpers.*; |
| |
| /** |
| * A generic interface that represents a config file, mostly XML |
| * Please note that this is an immutable, read-only object. |
| */ |
| public interface ConfigNode { |
| ThreadLocal<Function<String,String>> SUBSTITUTES = new ThreadLocal<>(); |
| |
| /** |
| * Name of the tag |
| */ |
| String name(); |
| |
| /** |
| * Attributes |
| */ |
| SimpleMap<String> attributes(); |
| |
| /** |
| * Child by name |
| */ |
| default ConfigNode child(String name) { |
| return child(null, name); |
| } |
| |
| /** |
| * Child by name or return an empty node if null |
| * if there are multiple values , it returns the first elem |
| * This never returns a null |
| */ |
| default ConfigNode get(String name) { |
| ConfigNode child = child(null, name); |
| return child == null? EMPTY: child; |
| } |
| default ConfigNode get(String name, Predicate<ConfigNode> test) { |
| List<ConfigNode> children = getAll(test, name); |
| if(children.isEmpty()) return EMPTY; |
| return children.get(0); |
| } |
| default ConfigNode get(String name, int idx) { |
| List<ConfigNode> children = getAll(null, name); |
| if(idx < children.size()) return children.get(idx); |
| return EMPTY; |
| |
| } |
| |
| default ConfigNode child(List<String> path) { |
| ConfigNode node = this; |
| for (String s : path) { |
| node = node.child(s); |
| if (node == null) break; |
| } |
| return node; |
| } |
| |
| default ConfigNode child(String name, Supplier<RuntimeException> err) { |
| ConfigNode n = child(name); |
| if(n == null) throw err.get(); |
| return n; |
| } |
| |
| default boolean boolVal(boolean def) { return _bool(txt(),def); } |
| default int intVal(int def) { return _int(txt(), def); } |
| default String attr(String name, String def) { return _txt(attributes().get(name), def);} |
| default String attr(String name) { return attributes().get(name);} |
| default String requiredStrAttr(String name, Supplier<RuntimeException> err) { |
| String attr = attr(name); |
| if(attr == null && err != null) throw err.get(); |
| return attr; |
| } |
| default int intAttr(String name, int def) { return _int(attr(name), def); } |
| default boolean boolAttr(String name, boolean def){ return _bool(attr(name), def); } |
| default String txt(String def) { return txt() == null ? def : txt();} |
| String txt() ; |
| default double doubleVal(double def){ return _double(txt(), def); } |
| /**Iterate through child nodes with the name and return the first child that matches |
| */ |
| default ConfigNode child(Predicate<ConfigNode> test, String name) { |
| ConfigNode[] result = new ConfigNode[1]; |
| forEachChild(it -> { |
| if (name!=null && !name.equals(it.name())) return Boolean.TRUE; |
| if (test == null || test.test(it)) { |
| result[0] = it; |
| return Boolean.FALSE; |
| } |
| return Boolean.TRUE; |
| }); |
| return result[0]; |
| } |
| |
| /**Iterate through child nodes with the names and return all the matching children |
| * @param nodeNames names of tags to be returned |
| * @param test check for the nodes to be returned |
| */ |
| default List<ConfigNode> getAll(Predicate<ConfigNode> test, String... nodeNames) { |
| return getAll(test, nodeNames == null ? Collections.emptySet() : new HashSet<>(Arrays.asList(nodeNames))); |
| } |
| |
| /**Iterate through child nodes with the names and return all the matching children |
| * @param matchNames names of tags to be returned |
| * @param test check for the nodes to be returned |
| */ |
| default List<ConfigNode> getAll(Predicate<ConfigNode> test, Set<String> matchNames) { |
| List<ConfigNode> result = new ArrayList<>(); |
| forEachChild(it -> { |
| if (matchNames != null && !matchNames.isEmpty() && !matchNames.contains(it.name())) return Boolean.TRUE; |
| if (test == null || test.test(it)) result.add(it); |
| return Boolean.TRUE; |
| }); |
| return result; |
| } |
| |
| default List<ConfigNode> getAll(String name) { |
| return getAll(null, Collections.singleton(name)); |
| } |
| |
| default boolean exists() { return true; } |
| default boolean isNull() { return false; } |
| |
| /** abortable iterate through children |
| * |
| * @param fun consume the node and return true to continue or false to abort |
| */ |
| void forEachChild(Function<ConfigNode, Boolean> fun); |
| |
| /**An empty node object. |
| * usually returned when the node is absent |
| * |
| */ |
| ConfigNode EMPTY = new ConfigNode() { |
| @Override |
| public String name() { |
| return null; |
| } |
| |
| @Override |
| public String txt() { return null; } |
| |
| @Override |
| public SimpleMap<String> attributes() { |
| return empty_attrs; |
| } |
| |
| @Override |
| public String attr(String name) { return null; } |
| |
| @Override |
| public String attr(String name, String def) { return def; } |
| |
| @Override |
| public ConfigNode child(String name) { return null; } |
| |
| @Override |
| public ConfigNode get(String name) { |
| return EMPTY; |
| } |
| |
| public boolean exists() { return false; } |
| |
| @Override |
| public boolean isNull() { return true; } |
| |
| @Override |
| public void forEachChild(Function<ConfigNode, Boolean> fun) { } |
| } ; |
| SimpleMap<String> empty_attrs = new WrappedSimpleMap<>(Collections.emptyMap()); |
| |
| class Helpers { |
| static boolean _bool(Object v, boolean def) { return v == null ? def : Boolean.parseBoolean(v.toString()); } |
| static String _txt(Object v, String def) { return v == null ? def : v.toString(); } |
| static int _int(Object v, int def) { return v==null? def: Integer.parseInt(v.toString()); } |
| static double _double(Object v, double def) { return v == null ? def: Double.parseDouble(v.toString()); } |
| public static Predicate<ConfigNode> at(int i) { |
| return new Predicate<ConfigNode>() { |
| int index =0; |
| @Override |
| public boolean test(ConfigNode node) { |
| if(index == i) return true; |
| index++; |
| return false; |
| } |
| }; |
| } |
| } |
| } |