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// Copyright (C) 2009 The Android Open Source Project
//
// Licensed 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 com.google.gerrit.server.config;
import static org.eclipse.jgit.util.StringUtils.equalsIgnoreCase;
import org.eclipse.jgit.lib.Config;
import java.lang.reflect.InvocationTargetException;
import java.util.concurrent.TimeUnit;
public class ConfigUtil {
/**
* Parse a Java enumeration from the configuration.
*
* @param <T> type of the enumeration object.
* @param config the configuration file to read.
* @param section section the key is in.
* @param subsection subsection the key is in, or null if not in a subsection.
* @param setting name of the setting to read.
* @param defaultValue default value to return if the setting was not set.
* Must not be null as the enumeration values are derived from this.
* @return the selected enumeration value, or {@code defaultValue}.
*/
@SuppressWarnings("unchecked")
public static <T extends Enum<?>> T getEnum(final Config config,
final String section, final String subsection, final String setting,
final T defaultValue) {
final T[] all;
try {
all = (T[]) defaultValue.getClass().getMethod("values").invoke(null);
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Cannot obtain enumeration values", e);
} catch (SecurityException e) {
throw new IllegalArgumentException("Cannot obtain enumeration values", e);
} catch (IllegalAccessException e) {
throw new IllegalArgumentException("Cannot obtain enumeration values", e);
} catch (InvocationTargetException e) {
throw new IllegalArgumentException("Cannot obtain enumeration values", e);
} catch (NoSuchMethodException e) {
throw new IllegalArgumentException("Cannot obtain enumeration values", e);
}
return getEnum(config, section, subsection, setting, all, defaultValue);
}
/**
* Parse a Java enumeration from the configuration.
*
* @param <T> type of the enumeration object.
* @param config the configuration file to read.
* @param section section the key is in.
* @param subsection subsection the key is in, or null if not in a subsection.
* @param setting name of the setting to read.
* @param all all possible values in the enumeration which should be
* recognized. This should be {@code EnumType.values()}.
* @param defaultValue default value to return if the setting was not set.
* This value may be null.
* @return the selected enumeration value, or {@code defaultValue}.
*/
public static <T extends Enum<?>> T getEnum(final Config config,
final String section, final String subsection, final String setting,
final T[] all, final T defaultValue) {
final String valueString = config.getString(section, subsection, setting);
if (valueString == null) {
return defaultValue;
}
String n = valueString.replace(' ', '_');
for (final T e : all) {
if (equalsIgnoreCase(e.name(), n)) {
return e;
}
}
final StringBuilder r = new StringBuilder();
r.append("Value \"");
r.append(valueString);
r.append("\" not recognized in ");
r.append(section);
if (subsection != null) {
r.append(".");
r.append(subsection);
}
r.append(".");
r.append(setting);
r.append("; supported values are: ");
for (final T e : all) {
r.append(e.name());
r.append(" ");
}
throw new IllegalArgumentException(r.toString().trim());
}
/**
* Parse a numerical time unit, such as "1 minute", from the configuration.
*
* @param config the configuration file to read.
* @param section section the key is in.
* @param subsection subsection the key is in, or null if not in a subsection.
* @param setting name of the setting to read.
* @param defaultValue default value to return if no value was set in the
* configuration file.
* @param wantUnit the units of {@code defaultValue} and the return value, as
* well as the units to assume if the value does not contain an
* indication of the units.
* @return the setting, or {@code defaultValue} if not set, expressed in
* {@code units}.
*/
public static long getTimeUnit(final Config config, final String section,
final String subsection, final String setting, final long defaultValue,
final TimeUnit wantUnit) {
final String valueString = config.getString(section, subsection, setting);
if (valueString == null) {
return defaultValue;
}
String s = valueString.trim();
if (s.length() == 0) {
return defaultValue;
}
final String unitName;
final int sp = s.indexOf(' ');
if (sp > 0) {
unitName = s.substring(sp + 1).trim();
s = s.substring(0, sp);
} else {
final char last = s.charAt(s.length() - 1);
if ('0' <= last && last <= '9') {
unitName = "";
} else {
unitName = String.valueOf(last);
s = s.substring(0, s.length() - 1).trim();
}
}
if (s.length() == 0) {
return defaultValue;
}
TimeUnit inputUnit;
int inputMul;
if ("".equals(unitName)) {
inputUnit = wantUnit;
inputMul = 1;
} else if (match(unitName, "s", "sec", "second", "seconds")) {
inputUnit = TimeUnit.SECONDS;
inputMul = 1;
} else if (match(unitName, "m", "min", "minute", "minutes")) {
inputUnit = TimeUnit.MINUTES;
inputMul = 1;
} else if (match(unitName, "h", "hr", "hour", "hours")) {
inputUnit = TimeUnit.HOURS;
inputMul = 1;
} else if (match(unitName, "d", "day", "days")) {
inputUnit = TimeUnit.DAYS;
inputMul = 1;
} else if (match(unitName, "w", "week", "weeks")) {
inputUnit = TimeUnit.DAYS;
inputMul = 7;
} else if (match(unitName, "mon", "month", "months")) {
inputUnit = TimeUnit.DAYS;
inputMul = 30;
} else if (match(unitName, "y", "year", "years")) {
inputUnit = TimeUnit.DAYS;
inputMul = 365;
} else {
throw notTimeUnit(section, subsection, setting, valueString);
}
try {
return wantUnit.convert(Long.parseLong(s) * inputMul, inputUnit);
} catch (NumberFormatException nfe) {
throw notTimeUnit(section, subsection, setting, valueString);
}
}
private static boolean match(final String a, final String... cases) {
for (final String b : cases) {
if (equalsIgnoreCase(a, b)) {
return true;
}
}
return false;
}
private static IllegalArgumentException notTimeUnit(final String section,
final String subsection, final String setting, final String valueString) {
return new IllegalArgumentException("Invalid time unit value: " + section
+ (subsection != null ? "." + subsection : "") + "." + setting + " = "
+ valueString);
}
private ConfigUtil() {
}
}
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