org.apache.sshd.common.PropertyResolverUtils Maven / Gradle / Ivy
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* 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.sshd.common;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.NavigableSet;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.MapEntryUtils;
import org.apache.sshd.common.util.ValidateUtils;
/**
* @author Apache MINA SSHD Project
*/
public final class PropertyResolverUtils {
public static final String NONE_VALUE = "none";
/**
* Case insensitive {@link NavigableSet} of values considered {@code true} by {@link #parseBoolean(String)}
*/
public static final NavigableSet TRUE_VALUES = Collections.unmodifiableNavigableSet(
GenericUtils.asSortedSet(
String.CASE_INSENSITIVE_ORDER, "true", "t", "yes", "y", "on"));
/**
* Case insensitive {@link NavigableSet} of values considered {@code false} by {@link #parseBoolean(String)}
*/
public static final NavigableSet FALSE_VALUES = Collections.unmodifiableNavigableSet(
GenericUtils.asSortedSet(
String.CASE_INSENSITIVE_ORDER, "false", "f", "no", "n", "off"));
private PropertyResolverUtils() {
throw new UnsupportedOperationException("No instance allowed");
}
/**
* @param v Value to examine
* @return {@code true} if equals to {@value #NONE_VALUE} - case insensitive
*/
public static boolean isNoneValue(String v) {
return NONE_VALUE.equalsIgnoreCase(v);
}
/**
* @param resolver The {@link PropertyResolver} instance - ignored if {@code null}
* @param name The property name
* @param defaultValue The default value to return if the specified property does not exist in the
* properties map
* @return The resolved property
* @throws NumberFormatException if malformed value
* @see #toLong(Object, long)
*/
public static long getLongProperty(PropertyResolver resolver, String name, long defaultValue) {
return toLong(resolvePropertyValue(resolver, name), defaultValue);
}
public static long getLongProperty(Map props, String name, long defaultValue) {
return toLong(resolvePropertyValue(props, name), defaultValue);
}
/**
* Converts a generic object value to a {@code long} if possible:
*
* - If value is {@code null} the default is returned
*
* - If value is a {@link Number} then its {@link Number#longValue()} is returned
*
* - Otherwise, the value's {@code toString()} is parsed as a {@code long}
*
*
* @param value The resolved value - may be {@code null}
* @param defaultValue The default to use if {@code null} resolved value
* @return The resolved value
* @throws NumberFormatException if malformed value
* @see Long#parseLong(String)
*/
public static long toLong(Object value, long defaultValue) {
if (value == null) {
return defaultValue;
} else if (value instanceof Number) {
return ((Number) value).longValue();
} else { // we parse the string in case it is not a valid long value
return Long.parseLong(value.toString());
}
}
/**
* @param resolver The {@link PropertyResolver} instance - ignored if {@code null}
* @param name The property name
* @return The {@link Long} value or {@code null} if property not found
* @throws NumberFormatException if malformed value
* @see #toLong(Object)
*/
public static Long getLong(PropertyResolver resolver, String name) {
return toLong(resolvePropertyValue(resolver, name));
}
public static Long getLong(Map props, String name) {
return toLong(resolvePropertyValue(props, name));
}
/**
* Converts a generic object into a {@link Long}:
*
* - If the value is {@code null} then returns {@code null}.
*
* - If the value is already a {@link Long} then it is returned as such.
*
* - If value is a {@link Number} then its {@link Number#longValue()} is wrapped as a {@link Long}
*
* - Otherwise, the value's {@code toString()} is parsed as a {@link Long}
*
*
* @param value The resolved value - may be {@code null}
* @return The {@link Long} value or {@code null} if property not found
* @throws NumberFormatException if malformed value
* @see Long#valueOf(long)
* @see Long#valueOf(String)
*/
public static Long toLong(Object value) {
if (value == null) {
return null;
} else if (value instanceof Long) {
return (Long) value;
} else if (value instanceof Number) {
return ((Number) value).longValue();
} else { // we parse the string in case it is not a valid long value
return Long.valueOf(value.toString());
}
}
/**
* Converts an enumerated configuration value:
*
*
*
- If value is {@code null} then return {@code null}
*
*
*
*
- If value already of the expected type then simply cast and return it.
*
*
*
*
- If value is a {@link CharSequence} then convert it to a string and look for a matching enumerated value name
* - case insensitive.
*
* >
*
*
* @param Type of enumerated value
* @param enumType The enumerated class type
* @param value The configured value - ignored if {@code null}
* @param failIfNoMatch Whether to fail if no matching name found
* @param available The available values to compare the name
* @return The matching enumerated value - {@code null} if no match found
* @throws IllegalArgumentException If value is neither {@code null}, nor the enumerated type nor a
* {@link CharSequence}
* @throws NoSuchElementException If no matching string name found and failIfNoMatch is {@code true}
*/
public static > E toEnum(
Class enumType, Object value, boolean failIfNoMatch, Collection available) {
if (value == null) {
return null;
} else if (enumType.isInstance(value)) {
return enumType.cast(value);
} else if (value instanceof CharSequence) {
String name = value.toString();
if (GenericUtils.size(available) > 0) {
for (E v : available) {
if (name.equalsIgnoreCase(v.name())) {
return v;
}
}
}
if (failIfNoMatch) {
throw new NoSuchElementException("No match found for " + enumType.getSimpleName() + "[" + name + "]");
}
return null;
} else {
throw new IllegalArgumentException(
"Bad value type for enum conversion: " + value.getClass().getSimpleName());
}
}
public static Object updateProperty(PropertyResolver resolver, String name, long value) {
return updateProperty(resolver.getProperties(), name, value);
}
public static Object updateProperty(Map props, String name, long value) {
return updateProperty(props, name, Long.valueOf(value));
}
public static int getIntProperty(PropertyResolver resolver, String name, int defaultValue) {
return toInteger(resolvePropertyValue(resolver, name), defaultValue);
}
public static int getIntProperty(Map props, String name, int defaultValue) {
return toInteger(resolvePropertyValue(props, name), defaultValue);
}
public static int toInteger(Object value, int defaultValue) {
if (value == null) {
return defaultValue;
} else if (value instanceof Number) {
return ((Number) value).intValue();
} else { // we parse the string in case this is NOT an integer
return Integer.parseInt(value.toString());
}
}
public static Integer getInteger(PropertyResolver resolver, String name) {
return toInteger(resolvePropertyValue(resolver, name));
}
public static Integer getInteger(Map props, String name) {
return toInteger(resolvePropertyValue(props, name));
}
public static Integer toInteger(Object value) {
if (value == null) {
return null;
} else if (value instanceof Integer) {
return (Integer) value;
} else if (value instanceof Number) {
return ((Number) value).intValue();
} else { // we parse the string in case this is NOT a valid integer string
return Integer.valueOf(value.toString());
}
}
public static Object updateProperty(PropertyResolver resolver, String name, int value) {
return updateProperty(resolver.getProperties(), name, value);
}
public static Object updateProperty(Map props, String name, int value) {
return updateProperty(props, name, Integer.valueOf(value));
}
public static boolean getBooleanProperty(PropertyResolver resolver, String name, boolean defaultValue) {
return toBoolean(getObject(resolver, name), defaultValue);
}
public static boolean getBooleanProperty(Map props, String name, boolean defaultValue) {
return toBoolean(getObject(props, name), defaultValue);
}
/**
* @param value The value to convert
* @param defaultValue The default value to return if value is {@code null} or and empty string, then returns the
* default value.
* @return The resolved value
* @see #toBoolean(Object)
*/
public static boolean toBoolean(Object value, boolean defaultValue) {
Boolean bool = toBoolean(value);
if (bool == null) {
return defaultValue;
} else {
return bool;
}
}
public static Boolean getBoolean(PropertyResolver resolver, String name) {
Object propValue = resolvePropertyValue(resolver, name);
return toBoolean(propValue);
}
public static Boolean getBoolean(Map props, String name) {
Object propValue = resolvePropertyValue(props, name);
return toBoolean(propValue);
}
/**
*
* Attempts to convert the object into a {@link Boolean} value as follows:
*
*
*
*
*
- If {@code null} or an empty string then return {@code null}.
*
*
*
*
- If already a {@link Boolean} then return as-is
*
*
*
*
- If a {@link CharSequence} then invoke {@link #parseBoolean(String)}
*
*
*
*
- Otherwise, throws an {@link UnsupportedOperationException}
*
*
*
* @param value The value to be converted
* @return The result - {@code null} if {@code null} or an empty string
* @throws UnsupportedOperationException If value cannot be converted to a boolean - e.g., a number.
* @see #parseBoolean(String)
*/
public static Boolean toBoolean(Object value) {
if (value == null) {
return null;
} else if (value instanceof Boolean) {
return (Boolean) value;
} else if (value instanceof CharSequence) {
return parseBoolean(value.toString());
} else {
throw new UnsupportedOperationException(
"Cannot convert " + value.getClass().getSimpleName() + "[" + value + "] to boolean");
}
}
/**
* Converts a string to a {@link Boolean} value by looking for it in either the {@link #TRUE_VALUES} or
* {@link #FALSE_VALUES}
*
* @param value The value to parse
* @return The result - {@code null} if value is {@code null}/empty
* @throws IllegalArgumentException If non-empty string that does not match (case insensitive) either of the
* known values for boolean.
*/
public static Boolean parseBoolean(String value) {
if (GenericUtils.isEmpty(value)) {
return null;
} else if (TRUE_VALUES.contains(value)) {
return Boolean.TRUE;
} else if (FALSE_VALUES.contains(value)) {
return Boolean.FALSE;
} else {
throw new IllegalArgumentException("Unknown boolean value: '" + value + "'");
}
}
public static Object updateProperty(PropertyResolver resolver, String name, boolean value) {
return updateProperty(resolver.getProperties(), name, value);
}
public static Object updateProperty(Map props, String name, boolean value) {
return updateProperty(props, name, Boolean.valueOf(value));
}
/**
* @param resolver The {@link PropertyResolver} to use - ignored if {@code null}
* @param name The property name
* @param defaultValue The default value to return if property not set or empty
* @return The set value (if not {@code null}/empty) or default one
*/
public static String getStringProperty(
PropertyResolver resolver, String name, String defaultValue) {
String value = getString(resolver, name);
if (GenericUtils.isEmpty(value)) {
return defaultValue;
} else {
return value;
}
}
public static String getStringProperty(Map props, String name, String defaultValue) {
Object value = resolvePropertyValue(props, name);
if (value == null) {
return defaultValue;
} else {
return Objects.toString(value);
}
}
public static Charset getCharset(PropertyResolver resolver, String name, Charset defaultValue) {
Object value = getObject(resolver, name);
return (value == null) ? defaultValue : toCharset(value);
}
public static Charset getCharset(Map props, String name, Charset defaultValue) {
Object value = getObject(props, name);
return (value == null) ? defaultValue : toCharset(value);
}
public static Charset toCharset(Object value) {
if (value == null) {
return null;
} else if (value instanceof Charset) {
return (Charset) value;
} else if (value instanceof CharSequence) {
return Charset.forName(value.toString());
} else {
throw new IllegalArgumentException("Invalid charset conversion value: " + value);
}
}
public static String getString(PropertyResolver resolver, String name) {
Object value = getObject(resolver, name);
return Objects.toString(value, null);
}
public static String getString(Map props, String name) {
Object value = getObject(props, name);
return Objects.toString(value, null);
}
public static Object getObject(PropertyResolver resolver, String name) {
return resolvePropertyValue(resolver, name);
}
public static Object getObject(PropertyResolver resolver, String name, Object defaultValue) {
Object value = resolvePropertyValue(resolver, name);
return value != null ? value : defaultValue;
}
// for symmetrical reasons...
public static Object getObject(Map props, String name) {
return resolvePropertyValue(props, name);
}
public static Object resolvePropertyValue(Map props, String name) {
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
return (props != null) ? props.get(key) : null;
}
/**
* @param resolver The {@link PropertyResolver} instance
* @param name The property name
* @param value The new value - if {@code null} or an empty {@link CharSequence} the property is removed
* @return The previous value - {@code null} if none
*/
public static Object updateProperty(PropertyResolver resolver, String name, Object value) {
return updateProperty(resolver.getProperties(), name, value);
}
public static Object updateProperty(Map props, String name, Object value) {
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
if ((value == null) || ((value instanceof CharSequence) && GenericUtils.isEmpty((CharSequence) value))) {
return props.remove(key);
} else {
return props.put(key, value);
}
}
/**
* Unwinds the resolvers hierarchy until found one with a non-{@code null} value for the requested property or
* reached top. If still no value found and the key starts with "org.apache.sshd" then the system
* properties are also consulted
*
* @param resolver The {@link PropertyResolver} to start from - ignored if {@code null}
* @param name The requested property name
* @return The found value or {@code null}
*/
public static Object resolvePropertyValue(PropertyResolver resolver, String name) {
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
for (PropertyResolver r = resolver; r != null; r = r.getParentPropertyResolver()) {
Map props = r.getProperties();
Object value = getObject(props, key);
if (value != null) {
return value;
}
}
return null;
}
/**
* Unwinds the resolvers hierarchy until found one with a non-{@code null} value for the requested property or
* reached top.
*
* @param resolver The {@link PropertyResolver} to start from - ignored if {@code null}
* @param name The requested property name
* @return The found properties {@link Map} or {@code null}
*/
public static Map resolvePropertiesSource(PropertyResolver resolver, String name) {
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
for (PropertyResolver r = resolver; r != null; r = r.getParentPropertyResolver()) {
Map props = r.getProperties();
Object value = getObject(props, key);
if (value != null) {
return props;
}
}
return null;
}
public static PropertyResolver toPropertyResolver(Properties props) {
if (MapEntryUtils.isEmpty(props)) {
return PropertyResolver.EMPTY;
}
Collection names = props.stringPropertyNames();
Map propsMap = new ConcurrentHashMap<>(GenericUtils.size(names));
for (String key : names) {
String value = props.getProperty(key);
if (value == null) {
continue;
}
propsMap.put(key, value);
}
return toPropertyResolver(propsMap);
}
/**
* Wraps a {@link Map} into a {@link PropertyResolver} so it can be used with these utilities
*
* @param props The properties map - may be {@code null}/empty if no properties are updated
* @return The resolver wrapper
*/
public static PropertyResolver toPropertyResolver(Map props) {
return toPropertyResolver(props, null);
}
public static PropertyResolver toPropertyResolver(Map props, PropertyResolver parent) {
return new PropertyResolver() {
@Override
public PropertyResolver getParentPropertyResolver() {
return parent;
}
@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public Map getProperties() {
return (Map) props;
}
@Override
public String toString() {
return Objects.toString(props);
}
};
}
}
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