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org.codelibs.elasticsearch.common.settings.Settings Maven / Gradle / Ivy
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.codelibs.elasticsearch.common.settings;
import org.codelibs.elasticsearch.Version;
import org.codelibs.elasticsearch.common.Booleans;
import org.codelibs.elasticsearch.common.Strings;
import org.codelibs.elasticsearch.common.io.Streams;
import org.codelibs.elasticsearch.common.io.stream.StreamInput;
import org.codelibs.elasticsearch.common.io.stream.StreamOutput;
import org.codelibs.elasticsearch.common.settings.loader.SettingsLoader;
import org.codelibs.elasticsearch.common.settings.loader.SettingsLoaderFactory;
import org.codelibs.elasticsearch.common.unit.ByteSizeUnit;
import org.codelibs.elasticsearch.common.unit.ByteSizeValue;
import org.codelibs.elasticsearch.common.unit.RatioValue;
import org.codelibs.elasticsearch.common.unit.SizeValue;
import org.codelibs.elasticsearch.common.unit.TimeValue;
import org.codelibs.elasticsearch.common.xcontent.ToXContent;
import org.codelibs.elasticsearch.common.xcontent.XContentBuilder;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Dictionary;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static org.codelibs.elasticsearch.common.unit.ByteSizeValue.parseBytesSizeValue;
import static org.codelibs.elasticsearch.common.unit.SizeValue.parseSizeValue;
import static org.codelibs.elasticsearch.common.unit.TimeValue.parseTimeValue;
/**
* An immutable settings implementation.
*/
public final class Settings implements ToXContent {
public static final Settings EMPTY = new Builder().build();
private static final Pattern ARRAY_PATTERN = Pattern.compile("(.*)\\.\\d+$");
private Map settings;
Settings(Map settings) {
this.settings = Collections.unmodifiableMap(settings);
}
/**
* The settings as a flat {java.util.Map}.
* @return an unmodifiable map of settings
*/
public Map getAsMap() {
// settings is always unmodifiable
return this.settings;
}
/**
* The settings as a structured {java.util.Map}.
*/
public Map getAsStructuredMap() {
Map map = new HashMap<>(2);
for (Map.Entry entry : settings.entrySet()) {
processSetting(map, "", entry.getKey(), entry.getValue());
}
for (Map.Entry entry : map.entrySet()) {
if (entry.getValue() instanceof Map) {
@SuppressWarnings("unchecked") Map valMap = (Map) entry.getValue();
entry.setValue(convertMapsToArrays(valMap));
}
}
return map;
}
private void processSetting(Map map, String prefix, String setting, String value) {
int prefixLength = setting.indexOf('.');
if (prefixLength == -1) {
@SuppressWarnings("unchecked") Map innerMap = (Map) map.get(prefix + setting);
if (innerMap != null) {
// It supposed to be a value, but we already have a map stored, need to convert this map to "." notation
for (Map.Entry entry : innerMap.entrySet()) {
map.put(prefix + setting + "." + entry.getKey(), entry.getValue());
}
}
map.put(prefix + setting, value);
} else {
String key = setting.substring(0, prefixLength);
String rest = setting.substring(prefixLength + 1);
Object existingValue = map.get(prefix + key);
if (existingValue == null) {
Map newMap = new HashMap<>(2);
processSetting(newMap, "", rest, value);
map.put(key, newMap);
} else {
if (existingValue instanceof Map) {
@SuppressWarnings("unchecked")
Map innerMap = (Map) existingValue;
processSetting(innerMap, "", rest, value);
map.put(key, innerMap);
} else {
// It supposed to be a map, but we already have a value stored, which is not a map
// fall back to "." notation
processSetting(map, prefix + key + ".", rest, value);
}
}
}
}
private Object convertMapsToArrays(Map map) {
if (map.isEmpty()) {
return map;
}
boolean isArray = true;
int maxIndex = -1;
for (Map.Entry entry : map.entrySet()) {
if (isArray) {
try {
int index = Integer.parseInt(entry.getKey());
if (index >= 0) {
maxIndex = Math.max(maxIndex, index);
} else {
isArray = false;
}
} catch (NumberFormatException ex) {
isArray = false;
}
}
if (entry.getValue() instanceof Map) {
@SuppressWarnings("unchecked") Map valMap = (Map) entry.getValue();
entry.setValue(convertMapsToArrays(valMap));
}
}
if (isArray && (maxIndex + 1) == map.size()) {
ArrayList newValue = new ArrayList<>(maxIndex + 1);
for (int i = 0; i <= maxIndex; i++) {
Object obj = map.get(Integer.toString(i));
if (obj == null) {
// Something went wrong. Different format?
// Bailout!
return map;
}
newValue.add(obj);
}
return newValue;
}
return map;
}
/**
* A settings that are filtered (and key is removed) with the specified prefix.
*/
public Settings getByPrefix(String prefix) {
return new Settings(new FilteredMap(this.settings, (k) -> k.startsWith(prefix), prefix));
}
/**
* Returns a new settings object that contains all setting of the current one filtered by the given settings key predicate.
*/
public Settings filter(Predicate predicate) {
return new Settings(new FilteredMap(this.settings, predicate, null));
}
/**
* Returns the settings mapped to the given setting name.
*/
public Settings getAsSettings(String setting) {
return getByPrefix(setting + ".");
}
/**
* Returns the setting value associated with the setting key.
*
* @param setting The setting key
* @return The setting value, null if it does not exists.
*/
public String get(String setting) {
return settings.get(setting);
}
/**
* Returns the setting value associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public String get(String setting, String defaultValue) {
String retVal = get(setting);
return retVal == null ? defaultValue : retVal;
}
/**
* Returns the setting value (as float) associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public Float getAsFloat(String setting, Float defaultValue) {
String sValue = get(setting);
if (sValue == null) {
return defaultValue;
}
try {
return Float.parseFloat(sValue);
} catch (NumberFormatException e) {
throw new SettingsException("Failed to parse float setting [" + setting + "] with value [" + sValue + "]", e);
}
}
/**
* Returns the setting value (as double) associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public Double getAsDouble(String setting, Double defaultValue) {
String sValue = get(setting);
if (sValue == null) {
return defaultValue;
}
try {
return Double.parseDouble(sValue);
} catch (NumberFormatException e) {
throw new SettingsException("Failed to parse double setting [" + setting + "] with value [" + sValue + "]", e);
}
}
/**
* Returns the setting value (as int) associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public Integer getAsInt(String setting, Integer defaultValue) {
String sValue = get(setting);
if (sValue == null) {
return defaultValue;
}
try {
return Integer.parseInt(sValue);
} catch (NumberFormatException e) {
throw new SettingsException("Failed to parse int setting [" + setting + "] with value [" + sValue + "]", e);
}
}
/**
* Returns the setting value (as long) associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public Long getAsLong(String setting, Long defaultValue) {
String sValue = get(setting);
if (sValue == null) {
return defaultValue;
}
try {
return Long.parseLong(sValue);
} catch (NumberFormatException e) {
throw new SettingsException("Failed to parse long setting [" + setting + "] with value [" + sValue + "]", e);
}
}
/**
* Returns the setting value (as boolean) associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public Boolean getAsBoolean(String setting, Boolean defaultValue) {
return Booleans.parseBoolean(get(setting), defaultValue);
}
/**
* Returns the setting value (as time) associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public TimeValue getAsTime(String setting, TimeValue defaultValue) {
return parseTimeValue(get(setting), defaultValue, setting);
}
/**
* Returns the setting value (as size) associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public ByteSizeValue getAsBytesSize(String setting, ByteSizeValue defaultValue) throws SettingsException {
return parseBytesSizeValue(get(setting), defaultValue, setting);
}
/**
* Returns the setting value (as size) associated with the setting key. Provided values can either be
* absolute values (interpreted as a number of bytes), byte sizes (eg. 1mb) or percentage of the heap size
* (eg. 12%). If it does not exists, parses the default value provided.
*/
public ByteSizeValue getAsMemory(String setting, String defaultValue) throws SettingsException {
throw new UnsupportedOperationException("querybuilders does not support this operation.");
}
/**
* Returns the setting value (as a RatioValue) associated with the setting key. Provided values can
* either be a percentage value (eg. 23%), or expressed as a floating point number (eg. 0.23). If
* it does not exist, parses the default value provided.
*/
public RatioValue getAsRatio(String setting, String defaultValue) throws SettingsException {
return RatioValue.parseRatioValue(get(setting, defaultValue));
}
/**
* Returns the setting value (as size) associated with the setting key. If it does not exists,
* returns the default value provided.
*/
public SizeValue getAsSize(String setting, SizeValue defaultValue) throws SettingsException {
return parseSizeValue(get(setting), defaultValue);
}
/**
* The values associated with a setting prefix as an array. The settings array is in the format of:
* settingPrefix.[index] .
*
* It will also automatically load a comma separated list under the settingPrefix and merge with
* the numbered format.
*
* @param settingPrefix The setting prefix to load the array by
* @return The setting array values
*/
public String[] getAsArray(String settingPrefix) throws SettingsException {
return getAsArray(settingPrefix, Strings.EMPTY_ARRAY, true);
}
/**
* The values associated with a setting prefix as an array. The settings array is in the format of:
* settingPrefix.[index] .
*
* If commaDelimited is true, it will automatically load a comma separated list under the settingPrefix and merge with
* the numbered format.
*
* @param settingPrefix The setting prefix to load the array by
* @return The setting array values
*/
public String[] getAsArray(String settingPrefix, String[] defaultArray) throws SettingsException {
return getAsArray(settingPrefix, defaultArray, true);
}
/**
* The values associated with a setting prefix as an array. The settings array is in the format of:
* settingPrefix.[index] .
*
* It will also automatically load a comma separated list under the settingPrefix and merge with
* the numbered format.
*
* @param settingPrefix The setting prefix to load the array by
* @param defaultArray The default array to use if no value is specified
* @param commaDelimited Whether to try to parse a string as a comma-delimited value
* @return The setting array values
*/
public String[] getAsArray(String settingPrefix, String[] defaultArray, Boolean commaDelimited) throws SettingsException {
List result = new ArrayList<>();
if (get(settingPrefix) != null) {
if (commaDelimited) {
String[] strings = Strings.splitStringByCommaToArray(get(settingPrefix));
if (strings.length > 0) {
for (String string : strings) {
result.add(string.trim());
}
}
} else {
result.add(get(settingPrefix).trim());
}
}
int counter = 0;
while (true) {
String value = get(settingPrefix + '.' + (counter++));
if (value == null) {
break;
}
result.add(value.trim());
}
if (result.isEmpty()) {
return defaultArray;
}
return result.toArray(new String[result.size()]);
}
/**
* Returns group settings for the given setting prefix.
*/
public Map getGroups(String settingPrefix) throws SettingsException {
return getGroups(settingPrefix, false);
}
/**
* Returns group settings for the given setting prefix.
*/
public Map getGroups(String settingPrefix, boolean ignoreNonGrouped) throws SettingsException {
if (!Strings.hasLength(settingPrefix)) {
throw new IllegalArgumentException("illegal setting prefix " + settingPrefix);
}
if (settingPrefix.charAt(settingPrefix.length() - 1) != '.') {
settingPrefix = settingPrefix + ".";
}
return getGroupsInternal(settingPrefix, ignoreNonGrouped);
}
private Map getGroupsInternal(String settingPrefix, boolean ignoreNonGrouped) throws SettingsException {
// we don't really care that it might happen twice
Map> map = new LinkedHashMap<>();
for (Object o : settings.keySet()) {
String setting = (String) o;
if (setting.startsWith(settingPrefix)) {
String nameValue = setting.substring(settingPrefix.length());
int dotIndex = nameValue.indexOf('.');
if (dotIndex == -1) {
if (ignoreNonGrouped) {
continue;
}
throw new SettingsException("Failed to get setting group for [" + settingPrefix + "] setting prefix and setting ["
+ setting + "] because of a missing '.'");
}
String name = nameValue.substring(0, dotIndex);
String value = nameValue.substring(dotIndex + 1);
Map groupSettings = map.get(name);
if (groupSettings == null) {
groupSettings = new LinkedHashMap<>();
map.put(name, groupSettings);
}
groupSettings.put(value, get(setting));
}
}
Map retVal = new LinkedHashMap<>();
for (Map.Entry> entry : map.entrySet()) {
retVal.put(entry.getKey(), new Settings(Collections.unmodifiableMap(entry.getValue())));
}
return Collections.unmodifiableMap(retVal);
}
/**
* Returns group settings for the given setting prefix.
*/
public Map getAsGroups() throws SettingsException {
return getAsGroups(false);
}
public Map getAsGroups(boolean ignoreNonGrouped) throws SettingsException {
return getGroupsInternal("", ignoreNonGrouped);
}
/**
* Returns a parsed version.
*/
public Version getAsVersion(String setting, Version defaultVersion) throws SettingsException {
String sValue = get(setting);
if (sValue == null) {
return defaultVersion;
}
try {
return Version.fromId(Integer.parseInt(sValue));
} catch (Exception e) {
throw new SettingsException("Failed to parse version setting [" + setting + "] with value [" + sValue + "]", e);
}
}
/**
* @return The direct keys of this settings
*/
public Set names() {
Set names = new HashSet<>();
for (String key : settings.keySet()) {
int i = key.indexOf(".");
if (i < 0) {
names.add(key);
} else {
names.add(key.substring(0, i));
}
}
return names;
}
/**
* Returns the settings as delimited string.
*/
public String toDelimitedString(char delimiter) {
StringBuilder sb = new StringBuilder();
for (Map.Entry entry : settings.entrySet()) {
sb.append(entry.getKey()).append("=").append(entry.getValue()).append(delimiter);
}
return sb.toString();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Settings that = (Settings) o;
if (settings != null ? !settings.equals(that.settings) : that.settings != null) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = settings != null ? settings.hashCode() : 0;
return result;
}
public static Settings readSettingsFromStream(StreamInput in) throws IOException {
Builder builder = new Builder();
int numberOfSettings = in.readVInt();
for (int i = 0; i < numberOfSettings; i++) {
builder.put(in.readString(), in.readOptionalString());
}
return builder.build();
}
public static void writeSettingsToStream(Settings settings, StreamOutput out) throws IOException {
out.writeVInt(settings.getAsMap().size());
for (Map.Entry entry : settings.getAsMap().entrySet()) {
out.writeString(entry.getKey());
out.writeOptionalString(entry.getValue());
}
}
/**
* Returns a builder to be used in order to build settings.
*/
public static Builder builder() {
return new Builder();
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
throw new UnsupportedOperationException("querybuilders does not support this operation.");
}
public static final Set FORMAT_PARAMS =
Collections.unmodifiableSet(new HashSet<>(Arrays.asList("settings_filter", "flat_settings")));
/**
* Returns true if this settings object contains no settings
* @return true if this settings object contains no settings
*/
public boolean isEmpty() {
return this.settings.isEmpty();
}
/**
* A builder allowing to put different settings and then {#build()} an immutable
* settings implementation. Use {Settings#builder()} in order to
* construct it.
*/
public static class Builder {
public static final Settings EMPTY_SETTINGS = new Builder().build();
// we use a sorted map for consistent serialization when using getAsMap()
private final Map map = new TreeMap<>();
private Builder() {
}
public Map internalMap() {
return this.map;
}
/**
* Removes the provided setting from the internal map holding the current list of settings.
*/
public String remove(String key) {
return map.remove(key);
}
/**
* Returns a setting value based on the setting key.
*/
public String get(String key) {
return map.get(key);
}
/**
* Puts tuples of key value pairs of settings. Simplified version instead of repeating calling
* put for each one.
*/
public Builder put(Object... settings) {
if (settings.length == 1) {
// support cases where the actual type gets lost down the road...
if (settings[0] instanceof Map) {
//noinspection unchecked
return put((Map) settings[0]);
} else if (settings[0] instanceof Settings) {
return put((Settings) settings[0]);
}
}
if ((settings.length % 2) != 0) {
throw new IllegalArgumentException(
"array settings of key + value order doesn't hold correct number of arguments (" + settings.length + ")");
}
for (int i = 0; i < settings.length; i++) {
put(settings[i++].toString(), settings[i].toString());
}
return this;
}
/**
* Sets a setting with the provided setting key and value.
*
* @param key The setting key
* @param value The setting value
* @return The builder
*/
public Builder put(String key, String value) {
map.put(key, value);
return this;
}
public Builder putNull(String key) {
return put(key, (String) null);
}
/**
* Sets a setting with the provided setting key and class as value.
*
* @param key The setting key
* @param clazz The setting class value
* @return The builder
*/
public Builder put(String key, Class clazz) {
map.put(key, clazz.getName());
return this;
}
/**
* Sets the setting with the provided setting key and the boolean value.
*
* @param setting The setting key
* @param value The boolean value
* @return The builder
*/
public Builder put(String setting, boolean value) {
put(setting, String.valueOf(value));
return this;
}
/**
* Sets the setting with the provided setting key and the int value.
*
* @param setting The setting key
* @param value The int value
* @return The builder
*/
public Builder put(String setting, int value) {
put(setting, String.valueOf(value));
return this;
}
public Builder put(String setting, Version version) {
put(setting, version.id);
return this;
}
/**
* Sets the setting with the provided setting key and the long value.
*
* @param setting The setting key
* @param value The long value
* @return The builder
*/
public Builder put(String setting, long value) {
put(setting, String.valueOf(value));
return this;
}
/**
* Sets the setting with the provided setting key and the float value.
*
* @param setting The setting key
* @param value The float value
* @return The builder
*/
public Builder put(String setting, float value) {
put(setting, String.valueOf(value));
return this;
}
/**
* Sets the setting with the provided setting key and the double value.
*
* @param setting The setting key
* @param value The double value
* @return The builder
*/
public Builder put(String setting, double value) {
put(setting, String.valueOf(value));
return this;
}
/**
* Sets the setting with the provided setting key and the time value.
*
* @param setting The setting key
* @param value The time value
* @return The builder
*/
public Builder put(String setting, long value, TimeUnit timeUnit) {
put(setting, timeUnit.toMillis(value) + "ms");
return this;
}
/**
* Sets the setting with the provided setting key and the size value.
*
* @param setting The setting key
* @param value The size value
* @return The builder
*/
public Builder put(String setting, long value, ByteSizeUnit sizeUnit) {
put(setting, sizeUnit.toBytes(value) + "b");
return this;
}
/**
* Sets the setting with the provided setting key and an array of values.
*
* @param setting The setting key
* @param values The values
* @return The builder
*/
/**
* Sets the setting with the provided setting key and an array of values.
*
* @param setting The setting key
* @param values The values
* @return The builder
*/
public Builder putArray(String setting, String... values) {
return putArray(setting, Arrays.asList(values));
}
/**
* Sets the setting with the provided setting key and a list of values.
*
* @param setting The setting key
* @param values The values
* @return The builder
*/
public Builder putArray(String setting, List values) {
remove(setting);
int counter = 0;
while (true) {
String value = map.remove(setting + '.' + (counter++));
if (value == null) {
break;
}
}
for (int i = 0; i < values.size(); i++) {
put(setting + "." + i, values.get(i));
}
return this;
}
/**
* Sets the setting as an array of values, but keeps existing elements for the key.
*/
public Builder extendArray(String setting, String... values) {
// check for a singular (non array) value
String oldSingle = remove(setting);
// find the highest array index
int counter = 0;
while (map.containsKey(setting + '.' + counter)) {
++counter;
}
if (oldSingle != null) {
put(setting + '.' + counter++, oldSingle);
}
for (String value : values) {
put(setting + '.' + counter++, value);
}
return this;
}
/**
* Sets the setting group.
*/
public Builder put(String settingPrefix, String groupName, String[] settings, String[] values) throws SettingsException {
if (settings.length != values.length) {
throw new SettingsException("The settings length must match the value length");
}
for (int i = 0; i < settings.length; i++) {
if (values[i] == null) {
continue;
}
put(settingPrefix + "." + groupName + "." + settings[i], values[i]);
}
return this;
}
/**
* Sets all the provided settings.
*/
public Builder put(Settings settings) {
removeNonArraysFieldsIfNewSettingsContainsFieldAsArray(settings.getAsMap());
map.putAll(settings.getAsMap());
return this;
}
/**
* Sets all the provided settings.
*/
public Builder put(Map settings) {
removeNonArraysFieldsIfNewSettingsContainsFieldAsArray(settings);
map.putAll(settings);
return this;
}
/**
* Removes non array values from the existing map, if settings contains an array value instead
*
* Example:
* Existing map contains: {key:value}
* New map contains: {key:[value1,value2]} (which has been flattened to {}key.0:value1,key.1:value2})
*
* This ensure that that the 'key' field gets removed from the map in order to override all the
* data instead of merging
*/
private void removeNonArraysFieldsIfNewSettingsContainsFieldAsArray(Map settings) {
List prefixesToRemove = new ArrayList<>();
for (final Map.Entry entry : settings.entrySet()) {
final Matcher matcher = ARRAY_PATTERN.matcher(entry.getKey());
if (matcher.matches()) {
prefixesToRemove.add(matcher.group(1));
} else if (map.keySet().stream().anyMatch(key -> key.startsWith(entry.getKey() + "."))) {
prefixesToRemove.add(entry.getKey());
}
}
for (String prefix : prefixesToRemove) {
Iterator> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry entry = iterator.next();
if (entry.getKey().startsWith(prefix + ".") || entry.getKey().equals(prefix)) {
iterator.remove();
}
}
}
}
/**
* Sets all the provided settings.
*/
public Builder put(Dictionary properties) {
for (Object key : Collections.list(properties.keys())) {
map.put(Objects.toString(key), Objects.toString(properties.get(key)));
}
return this;
}
/**
* Loads settings from the actual string content that represents them using the
* {SettingsLoaderFactory#loaderFromSource(String)}.
*/
public Builder loadFromSource(String source) {
SettingsLoader settingsLoader = SettingsLoaderFactory.loaderFromSource(source);
try {
Map loadedSettings = settingsLoader.load(source);
put(loadedSettings);
} catch (Exception e) {
throw new SettingsException("Failed to load settings from [" + source + "]", e);
}
return this;
}
/**
* Loads settings from a url that represents them using the
* {SettingsLoaderFactory#loaderFromSource(String)}.
*/
public Builder loadFromPath(Path path) throws IOException {
// NOTE: loadFromStream will close the input stream
return loadFromStream(path.getFileName().toString(), Files.newInputStream(path));
}
/**
* Loads settings from a stream that represents them using the
* {SettingsLoaderFactory#loaderFromSource(String)}.
*/
public Builder loadFromStream(String resourceName, InputStream is) throws IOException {
SettingsLoader settingsLoader = SettingsLoaderFactory.loaderFromResource(resourceName);
// NOTE: copyToString will close the input stream
Map loadedSettings =
settingsLoader.load(Streams.copyToString(new InputStreamReader(is, StandardCharsets.UTF_8)));
put(loadedSettings);
return this;
}
public Builder putProperties(Map esSettings, Predicate keyPredicate, Function keyFunction) {
for (final Map.Entry esSetting : esSettings.entrySet()) {
final String key = esSetting.getKey();
if (keyPredicate.test(key)) {
map.put(keyFunction.apply(key), esSetting.getValue());
}
}
return this;
}
/**
* Runs across all the settings set on this builder and
* replaces ${...} elements in each setting with
* another setting already set on this builder.
*/
public Builder replacePropertyPlaceholders() {
return replacePropertyPlaceholders(System::getenv);
}
// visible for testing
Builder replacePropertyPlaceholders(Function getenv) {
PropertyPlaceholder propertyPlaceholder = new PropertyPlaceholder("${", "}", false);
PropertyPlaceholder.PlaceholderResolver placeholderResolver = new PropertyPlaceholder.PlaceholderResolver() {
@Override
public String resolvePlaceholder(String placeholderName) {
final String value = getenv.apply(placeholderName);
if (value != null) {
return value;
}
return map.get(placeholderName);
}
@Override
public boolean shouldIgnoreMissing(String placeholderName) {
if (placeholderName.startsWith("prompt.")) {
return true;
}
return false;
}
@Override
public boolean shouldRemoveMissingPlaceholder(String placeholderName) {
if (placeholderName.startsWith("prompt.")) {
return false;
}
return true;
}
};
Iterator> entryItr = map.entrySet().iterator();
while (entryItr.hasNext()) {
Map.Entry entry = entryItr.next();
if (entry.getValue() == null) {
// a null value obviously can't be replaced
continue;
}
String value = propertyPlaceholder.replacePlaceholders(entry.getValue(), placeholderResolver);
// if the values exists and has length, we should maintain it in the map
// otherwise, the replace process resolved into removing it
if (Strings.hasLength(value)) {
entry.setValue(value);
} else {
entryItr.remove();
}
}
return this;
}
/**
* Checks that all settings in the builder start with the specified prefix.
*
* If a setting doesn't start with the prefix, the builder appends the prefix to such setting.
*/
public Builder normalizePrefix(String prefix) {
Map replacements = new HashMap<>();
Iterator> iterator = map.entrySet().iterator();
while(iterator.hasNext()) {
Map.Entry entry = iterator.next();
if (entry.getKey().startsWith(prefix) == false) {
replacements.put(prefix + entry.getKey(), entry.getValue());
iterator.remove();
}
}
map.putAll(replacements);
return this;
}
/**
* Builds a {Settings} (underlying uses {Settings}) based on everything
* set on this builder.
*/
public Settings build() {
return new Settings(map);
}
}
// TODO We could use an FST internally to make things even faster and more compact
private static final class FilteredMap extends AbstractMap {
private final Map delegate;
private final Predicate filter;
private final String prefix;
// we cache that size since we have to iterate the entire set
// this is safe to do since this map is only used with unmodifiable maps
private int size = -1;
@Override
public Set> entrySet() {
Set> delegateSet = delegate.entrySet();
AbstractSet> filterSet = new AbstractSet>() {
@Override
public Iterator> iterator() {
Iterator> iter = delegateSet.iterator();
return new Iterator>() {
private int numIterated;
private Entry currentElement;
@Override
public boolean hasNext() {
if (currentElement != null) {
return true; // protect against calling hasNext twice
} else {
if (numIterated == size) { // early terminate
assert size != -1 : "size was never set: " + numIterated + " vs. " + size;
return false;
}
while (iter.hasNext()) {
if (filter.test((currentElement = iter.next()).getKey())) {
numIterated++;
return true;
}
}
// we didn't find anything
currentElement = null;
return false;
}
}
@Override
public Entry next() {
if (currentElement == null && hasNext() == false) { // protect against no #hasNext call or not respecting it
throw new NoSuchElementException("make sure to call hasNext first");
}
final Entry current = this.currentElement;
this.currentElement = null;
if (prefix == null) {
return current;
}
return new Entry() {
@Override
public String getKey() {
return current.getKey().substring(prefix.length());
}
@Override
public String getValue() {
return current.getValue();
}
@Override
public String setValue(String value) {
throw new UnsupportedOperationException();
}
};
}
};
}
@Override
public int size() {
return FilteredMap.this.size();
}
};
return filterSet;
}
private FilteredMap(Map delegate, Predicate filter, String prefix) {
this.delegate = delegate;
this.filter = filter;
this.prefix = prefix;
}
@Override
public String get(Object key) {
if (key instanceof String) {
final String theKey = prefix == null ? (String)key : prefix + key;
if (filter.test(theKey)) {
return delegate.get(theKey);
}
}
return null;
}
@Override
public boolean containsKey(Object key) {
if (key instanceof String) {
final String theKey = prefix == null ? (String) key : prefix + key;
if (filter.test(theKey)) {
return delegate.containsKey(theKey);
}
}
return false;
}
@Override
public int size() {
if (size == -1) {
size = Math.toIntExact(delegate.keySet().stream().filter((e) -> filter.test(e)).count());
}
return size;
}
}
}
