/*
* 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.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.lang.invoke.MethodHandles;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.http.HttpEntity;
import org.apache.http.util.EntityUtils;
import org.apache.solr.common.SolrException;
import org.noggit.CharArr;
import org.noggit.JSONParser;
import org.noggit.JSONWriter;
import org.noggit.ObjectBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static java.util.Collections.unmodifiableList;
import static java.util.Collections.unmodifiableSet;
public class Utils {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
public static Map getDeepCopy(Map map, int maxDepth) {
return getDeepCopy(map, maxDepth, true);
}
public static Map getDeepCopy(Map map, int maxDepth, boolean mutable) {
if(map == null) return null;
if (maxDepth < 1) return map;
Map copy = new LinkedHashMap();
for (Object o : map.entrySet()) {
Map.Entry e = (Map.Entry) o;
Object v = e.getValue();
if (v instanceof Map) v = getDeepCopy((Map) v, maxDepth - 1, mutable);
else if (v instanceof Collection) v = getDeepCopy((Collection) v, maxDepth - 1, mutable);
copy.put(e.getKey(), v);
}
return mutable ? copy : Collections.unmodifiableMap(copy);
}
public static Collection getDeepCopy(Collection c, int maxDepth, boolean mutable) {
if (c == null || maxDepth < 1) return c;
Collection result = c instanceof Set ? new HashSet() : new ArrayList();
for (Object o : c) {
if (o instanceof Map) {
o = getDeepCopy((Map) o, maxDepth - 1, mutable);
}
result.add(o);
}
return mutable ? result : result instanceof Set ? unmodifiableSet((Set) result) : unmodifiableList((List) result);
}
public static byte[] toJSON(Object o) {
if(o == null) return new byte[0];
CharArr out = new CharArr();
new JSONWriter(out, 2).write(o); // indentation by default
return toUTF8(out);
}
public static String toJSONString(Object o) {
return new String(toJSON(o), StandardCharsets.UTF_8);
}
public static byte[] toUTF8(CharArr out) {
byte[] arr = new byte[out.size() * 3];
int nBytes = ByteUtils.UTF16toUTF8(out, 0, out.size(), arr, 0);
return Arrays.copyOf(arr, nBytes);
}
public static Object fromJSON(byte[] utf8) {
// convert directly from bytes to chars
// and parse directly from that instead of going through
// intermediate strings or readers
CharArr chars = new CharArr();
ByteUtils.UTF8toUTF16(utf8, 0, utf8.length, chars);
JSONParser parser = new JSONParser(chars.getArray(), chars.getStart(), chars.length());
try {
return ObjectBuilder.getVal(parser);
} catch (IOException e) {
throw new RuntimeException(e); // should never happen w/o using real IO
}
}
public static Map<String, Object> makeMap(Object... keyVals) {
if ((keyVals.length & 0x01) != 0) {
throw new IllegalArgumentException("arguments should be key,value");
}
Map<String, Object> propMap = new LinkedHashMap<>(keyVals.length >> 1);
for (int i = 0; i < keyVals.length; i += 2) {
propMap.put(keyVals[i].toString(), keyVals[i + 1]);
}
return propMap;
}
public static Object fromJSON(InputStream is){
try {
return new ObjectBuilder(new JSONParser(new InputStreamReader(is, StandardCharsets.UTF_8))).getObject();
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Parse error", e);
}
}
public static Object fromJSONResource(String resourceName){
return fromJSON(Thread.currentThread()
.getContextClassLoader().getResourceAsStream(resourceName));
}
public static Object fromJSONString(String json) {
try {
return new ObjectBuilder(new JSONParser(new StringReader(
json))).getObject();
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Parse error", e);
}
}
public static Object getObjectByPath(Map root, boolean onlyPrimitive, String hierarchy) {
List<String> parts = StrUtils.splitSmart(hierarchy, '/');
if (parts.get(0).isEmpty()) parts.remove(0);
return getObjectByPath(root, onlyPrimitive, parts);
}
public static Object getObjectByPath(Map root, boolean onlyPrimitive, List<String> hierarchy) {
Map obj = root;
for (int i = 0; i < hierarchy.size(); i++) {
int idx = -1;
String s = hierarchy.get(i);
if (s.endsWith("]")) {
Matcher matcher = ARRAY_ELEMENT_INDEX.matcher(s);
if (matcher.find()) {
s = matcher.group(1);
idx = Integer.parseInt(matcher.group(2));
}
}
if (i < hierarchy.size() - 1) {
Object o = obj.get(s);
if (o == null) return null;
if (idx > -1) {
List l = (List) o;
o = idx < l.size() ? l.get(idx) : null;
}
if (!(o instanceof Map)) return null;
obj = (Map) o;
} else {
Object val = obj.get(s);
if (val == null) return null;
if (idx > -1) {
List l = (List) val;
val = idx < l.size() ? l.get(idx) : null;
}
if (onlyPrimitive && val instanceof Map) {
return null;
}
return val;
}
}
return false;
}
/**
* If the passed entity has content, make sure it is fully
* read and closed.
*
* @param entity to consume or null
*/
public static void consumeFully(HttpEntity entity) {
if (entity != null) {
try {
// make sure the stream is full read
readFully(entity.getContent());
} catch (UnsupportedOperationException e) {
// nothing to do then
} catch (IOException e) {
// quiet
} finally {
// close the stream
EntityUtils.consumeQuietly(entity);
}
}
}
/**
* Make sure the InputStream is fully read.
*
* @param is to read
* @throws IOException on problem with IO
*/
private static void readFully(InputStream is) throws IOException {
is.skip(is.available());
while (is.read() != -1) {}
}
public static final Pattern ARRAY_ELEMENT_INDEX = Pattern
.compile("(\\S*?)\\[(\\d+)\\]");
}