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Utility classes and methods developed for Brooklyn but not dependendent on Brooklyn or much else
/*
* 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.brooklyn.util.math;
import javax.annotation.Nullable;
import org.apache.brooklyn.util.guava.Functionals;
import org.apache.brooklyn.util.text.Strings;
import com.google.common.base.Function;
public class MathFunctions {
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function plusOld(final int addend) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Integer apply(@Nullable Number input) {
if (input==null) return null;
return input.intValue() + addend;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function plusOld(final long addend) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Long apply(@Nullable Number input) {
if (input==null) return null;
return input.longValue() + addend;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function plusOld(final double addend) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Double apply(@Nullable Number input) {
if (input==null) return null;
return input.doubleValue() + addend;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function timesOld(final int multiplicand) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Integer apply(@Nullable Number input) {
if (input==null) return null;
return input.intValue() * multiplicand;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function timesOld(final long multiplicand) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Long apply(@Nullable Number input) {
if (input==null) return null;
return input.longValue() * multiplicand;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function timesOld(final double multiplicand) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Double apply(@Nullable Number input) {
if (input==null) return null;
return input.doubleValue() * multiplicand;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function divideOld(final double divisor) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Double apply(@Nullable Number input) {
if (input==null) return null;
return input.doubleValue() / divisor;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function divideOld(final Function input, final double divisor) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Double apply(@Nullable T input2) {
if (input==null) return null;
Number n = input.apply(input2);
if (n==null) return null;
return n.doubleValue() / divisor;
}
};
}
/** returns a string of up to maxLen length (longer in extreme cases) also capped at significantDigits significantDigits */
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function readableStringOld(final int significantDigits, final int maxLen) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public String apply(@Nullable Number input) {
if (input==null) return null;
return Strings.makeRealString(input.doubleValue(), maxLen, significantDigits, 0);
}
};
}
/** returns a string where the input number is expressed as percent, with given number of significant digits */
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function percentOld(final int significantDigits) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public String apply(@Nullable Number input) {
if (input==null) return null;
return readableString(significantDigits, significantDigits+3).apply(input.doubleValue() * 100d)+"%";
}
};
}
public static Function plus(int addend) {
return new PlusInt(addend);
}
protected static class PlusInt implements Function {
private final int addend;
public PlusInt(int addend) {
this.addend = addend;
}
@Override
public Integer apply(@Nullable Number input) {
if (input==null) return null;
return input.intValue() + addend;
}
}
public static Function plus(long addend) {
return new PlusLong(addend);
}
protected static class PlusLong implements Function {
private final long addend;
public PlusLong(long addend) {
this.addend = addend;
}
@Override
public Long apply(@Nullable Number input) {
if (input==null) return null;
return input.longValue() + addend;
}
}
public static Function plus(final double addend) {
return new PlusDouble(addend);
}
protected static class PlusDouble implements Function {
private final double addend;
public PlusDouble(double addend) {
this.addend = addend;
}
@Override
public Double apply(@Nullable Number input) {
if (input==null) return null;
return input.doubleValue() + addend;
}
}
public static Function times(final int multiplicand) {
return new TimesInt(multiplicand);
}
protected static class TimesInt implements Function {
private final int multiplicand;
public TimesInt(int multiplicand) {
this.multiplicand = multiplicand;
}
@Override
public Integer apply(@Nullable Number input) {
if (input==null) return null;
return input.intValue() * multiplicand;
}
}
public static Function times(long multiplicand) {
return new TimesLong(multiplicand);
}
protected static class TimesLong implements Function {
private final long multiplicand;
public TimesLong(long multiplicand) {
this.multiplicand = multiplicand;
}
@Override
public Long apply(@Nullable Number input) {
if (input==null) return null;
return input.longValue() * multiplicand;
}
}
public static Function times(final double multiplicand) {
return new TimesDouble(multiplicand);
}
protected static class TimesDouble implements Function {
private final double multiplicand;
public TimesDouble(double multiplicand) {
this.multiplicand = multiplicand;
}
@Override
public Double apply(@Nullable Number input) {
if (input==null) return null;
return input.doubleValue() * multiplicand;
}
}
public static Function divide(double divisor) {
return new DivideDouble(divisor);
}
protected static class DivideDouble implements Function {
private final double divisor;
public DivideDouble(double divisor) {
this.divisor = divisor;
}
@Override
public Double apply(@Nullable Number input) {
if (input==null) return null;
return input.doubleValue() / divisor;
}
}
/** returns a string of up to maxLen length (longer in extreme cases) also capped at significantDigits significantDigits */
public static Function readableString(int significantDigits, int maxLen) {
return new ReadableString(significantDigits, maxLen);
}
protected static class ReadableString implements Function {
private final int significantDigits;
private final int maxLen;
public ReadableString(int significantDigits, int maxLen) {
this.significantDigits = significantDigits;
this.maxLen = maxLen;
}
@Override
public String apply(@Nullable Number input) {
if (input==null) return null;
return Strings.makeRealString(input.doubleValue(), maxLen, significantDigits, 0);
}
};
/** returns a string where the input number is expressed as percent, with given number of significant digits */
public static Function percent(int significantDigits) {
return new Percent(significantDigits);
}
private static class Percent implements Function {
final int significantDigits;
public Percent(int significantDigits) {
this.significantDigits = significantDigits;
}
@Override
public String apply(@Nullable Number input) {
if (input==null) return null;
return readableString(significantDigits, significantDigits+3).apply(input.doubleValue() * 100d)+"%";
}
}
}