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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.text;
import static com.google.common.base.Preconditions.checkNotNull;
import javax.annotation.Nullable;
import com.google.common.base.CaseFormat;
import com.google.common.base.CharMatcher;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Preconditions;
import com.google.common.collect.Iterables;
public class StringFunctions {
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function appendOld(final String suffix) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
@Nullable
public String apply(@Nullable String input) {
if (input==null) return null;
return input + suffix;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function prependOld(final String prefix) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
@Nullable
public String apply(@Nullable String input) {
if (input==null) return null;
return prefix + input;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function formatterOld(final String pattern) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
public String apply(@Nullable Object input) {
return String.format(pattern, input);
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function formatterForArrayOld(final String pattern) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
public String apply(@Nullable Object[] input) {
return String.format(pattern, input);
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function, String> joinerOld(final String separator) {
// TODO PERSISTENCE WORKAROUND
return new Function, String>() {
public String apply(@Nullable Iterable input) {
return Strings.join(input, separator);
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function joinerForArrayOld(final String separator) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
public String apply(@Nullable Object[] input) {
if (input == null) return Strings.EMPTY;
return Strings.join(input, separator);
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function lengthOld() {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public Integer apply(@Nullable String input) {
if (input == null) return -1;
return input.length();
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function surroundOld(final String prefix, final String suffix) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public String apply(@Nullable String input) {
if (input == null) return null;
return prefix+input+suffix;
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function trimOld() {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public String apply(@Nullable String input) {
if (input == null) return null;
if (Strings.isBlank(input)) return Strings.EMPTY;
return CharMatcher.BREAKING_WHITESPACE.trimFrom(input);
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function toLowerCaseOld() {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public String apply(String input) {
return input.toLowerCase();
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function toUpperCaseOld() {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public String apply(String input) {
return input.toUpperCase();
}
};
}
/** @deprecated since 0.9.0 kept only to allow conversion of anonymous inner classes */
@SuppressWarnings("unused") @Deprecated
private static Function convertCaseOld(final CaseFormat src, final CaseFormat target) {
// TODO PERSISTENCE WORKAROUND
return new Function() {
@Override
public String apply(String input) {
return src.to(target, input);
}
};
}
public static Function append(final String suffix) {
return new AppendFunction(checkNotNull(suffix, "suffix"));
}
private static class AppendFunction implements Function {
private final String suffix;
public AppendFunction(String suffix) {
this.suffix = suffix;
}
@Override
@Nullable
public String apply(@Nullable String input) {
if (input==null) return null;
return input + suffix;
}
};
public static Function prepend(final String prefix) {
return new PrependFunction(checkNotNull(prefix, "prefix"));
}
protected static class PrependFunction implements Function {
private final String prefix;
public PrependFunction(String prefix) {
this.prefix = prefix;
}
@Override
@Nullable
public String apply(@Nullable String input) {
if (input==null) return null;
return prefix + input;
}
}
/** given e.g. "hello %s" returns a function which will insert a string into that pattern */
public static Function formatter(final String pattern) {
return new FormatterFunction(pattern);
}
protected static class FormatterFunction implements Function {
private final String pattern;
FormatterFunction(String pattern) {
this.pattern = pattern;
}
public String apply(@Nullable Object input) {
return String.format(pattern, input);
}
};
/** given e.g. "hello %s %s" returns a function which will insert an array of two strings into that pattern */
public static Function formatterForArray(final String pattern) {
return new FormatterForArrayFunction(checkNotNull(pattern, "pattern"));
}
protected static class FormatterForArrayFunction implements Function {
private final String pattern;
public FormatterForArrayFunction(String pattern) {
this.pattern = pattern;
}
public String apply(@Nullable Object[] input) {
return String.format(pattern, input);
}
}
/**
* Given e.g. "hello %s %s" returns a function which will insert an Iterable of two strings into that pattern
*
* @since 0.9.0
*/
public static Function, String> formatterForIterable(final String pattern) {
return new FormatterForIterableFunction(pattern);
}
protected static class FormatterForIterableFunction implements Function, String> {
final String pattern;
public FormatterForIterableFunction(String pattern) {
this.pattern = pattern;
}
public String apply(@Nullable Iterable input) {
Object[] arr = (input == null) ? null : Iterables.toArray(input, Object.class);
return String.format(pattern, arr);
}
}
/** joins the given objects in a collection as a toString with the given separator */
public static Function, String> joiner(final String separator) {
return new JoinerFunction(separator);
}
private static class JoinerFunction implements Function, String> {
private final String separator;
public JoinerFunction(String separator) {
this.separator = separator;
}
public String apply(@Nullable Iterable input) {
return Strings.join(input, separator);
}
}
/** joins the given objects as a toString with the given separator, but expecting an array of objects, not a collection */
public static Function joinerForArray(final String separator) {
return new JoinerForArrayFunction(checkNotNull(separator, "separator"));
}
private static class JoinerForArrayFunction implements Function {
private final String separator;
protected JoinerForArrayFunction(String separator) {
this.separator = separator;
}
public String apply(@Nullable Object[] input) {
if (input == null) return Strings.EMPTY;
return Strings.join(input, separator);
}
}
/** provided here as a convenience; prefer {@link Functions#toStringFunction()} */
public static Function toStringFunction() {
return Functions.toStringFunction();
}
/** returns function which gives length of input, with -1 for nulls */
public static Function length() {
return new LengthFunction();
}
protected static class LengthFunction implements Function {
@Override
public Integer apply(@Nullable String input) {
if (input == null) return -1;
return input.length();
}
}
/** Surrounds an input string with the given prefix and suffix */
public static Function surround(final String prefix, final String suffix) {
Preconditions.checkNotNull(prefix);
Preconditions.checkNotNull(suffix);
return new SurroundFunction(prefix, suffix);
}
protected static class SurroundFunction implements Function {
private final String prefix;
private final String suffix;
public SurroundFunction(String prefix, String suffix) {
this.prefix = prefix;
this.suffix = suffix;
}
@Override
public String apply(@Nullable String input) {
if (input == null) return null;
return prefix+input+suffix;
}
}
public static Function trim() {
return new TrimFunction();
}
protected static class TrimFunction implements Function {
@Override
public String apply(@Nullable String input) {
if (input == null) return null;
if (Strings.isBlank(input)) return Strings.EMPTY;
return CharMatcher.BREAKING_WHITESPACE.trimFrom(input);
}
}
public static Function toLowerCase() {
return new LowerCaseFunction();
}
protected static class LowerCaseFunction implements Function {
@Override
public String apply(String input) {
return input.toLowerCase();
}
}
public static Function toUpperCase() {
return new UpperCaseFunction();
}
protected static class UpperCaseFunction implements Function {
@Override
public String apply(String input) {
return input.toUpperCase();
}
}
public static Function convertCase(final CaseFormat src, final CaseFormat target) {
return new ConvertCaseFunction(checkNotNull(src, "src"), checkNotNull(target, "target"));
}
protected static class ConvertCaseFunction implements Function {
private final CaseFormat src;
private final CaseFormat target;
public ConvertCaseFunction(CaseFormat src, CaseFormat target) {
this.src = src;
this.target = target;
}
@Override
public String apply(String input) {
return src.to(target, input);
}
}
public static class RegexReplacer implements Function {
private final String pattern;
private final String replacement;
public RegexReplacer(String pattern, String replacement) {
this.pattern = pattern;
this.replacement = replacement;
}
@Nullable
@Override
public String apply(@Nullable String s) {
return Strings.replaceAllRegex(s, pattern, replacement);
}
}
}
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