com.gs.collections.impl.block.factory.StringFunctions Maven / Gradle / Ivy
/*
* Copyright 2011 Goldman Sachs.
*
* 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.gs.collections.impl.block.factory;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.primitive.BooleanFunction;
import com.gs.collections.api.block.function.primitive.ByteFunction;
import com.gs.collections.api.block.function.primitive.CharFunction;
import com.gs.collections.api.block.function.primitive.DoubleFunction;
import com.gs.collections.api.block.function.primitive.FloatFunction;
import com.gs.collections.api.block.function.primitive.IntFunction;
import com.gs.collections.api.block.function.primitive.LongFunction;
import com.gs.collections.api.block.function.primitive.ShortFunction;
import com.gs.collections.impl.block.function.primitive.IntegerFunctionImpl;
public final class StringFunctions
{
private static final Function TO_UPPER_CASE = new ToUpperCaseFunction();
private static final Function TO_LOWER_CASE = new ToLowerCaseFunction();
private static final IntegerFunctionImpl LENGTH = new LengthFunction();
private static final Function TRIM = new TrimFunction();
private static final Function FIRST_LETTER = new FirstLetterFunction();
private static final Function TO_INTEGER = new ToIntegerFunction();
private static final BooleanFunction TO_PRIMITIVE_BOOLEAN = new ToPrimitiveBooleanFunction();
private static final ByteFunction TO_PRIMITIVE_BYTE = new ToPrimitiveByteFunction();
private static final CharFunction TO_PRIMITIVE_CHAR = new ToPrimitiveCharFunction();
private static final CharFunction TO_FIRST_CHAR = new ToFirstCharFunction();
private static final DoubleFunction TO_PRIMITIVE_DOUBLE = new ToPrimitiveDoubleFunction();
private static final FloatFunction TO_PRIMITIVE_FLOAT = new ToPrimitiveFloatFunction();
private static final IntFunction TO_PRIMITIVE_INT = new ToPrimitiveIntFunction();
private static final LongFunction TO_PRIMITIVE_LONG = new ToPrimitiveLongFunction();
private static final ShortFunction TO_PRIMITIVE_SHORT = new ToPrimitiveShortFunction();
private StringFunctions()
{
throw new AssertionError("Suppress default constructor for noninstantiability");
}
public static Function toUpperCase()
{
return TO_UPPER_CASE;
}
public static Function toLowerCase()
{
return TO_LOWER_CASE;
}
public static Function toInteger()
{
return TO_INTEGER;
}
public static BooleanFunction toPrimitiveBoolean()
{
return TO_PRIMITIVE_BOOLEAN;
}
public static ByteFunction toPrimitiveByte()
{
return TO_PRIMITIVE_BYTE;
}
public static CharFunction toPrimitiveChar()
{
return TO_PRIMITIVE_CHAR;
}
/**
* @throws StringIndexOutOfBoundsException if the String is empty
*/
public static CharFunction toFirstChar()
{
return TO_FIRST_CHAR;
}
public static DoubleFunction toPrimitiveDouble()
{
return TO_PRIMITIVE_DOUBLE;
}
public static FloatFunction toPrimitiveFloat()
{
return TO_PRIMITIVE_FLOAT;
}
public static IntFunction toPrimitiveInt()
{
return TO_PRIMITIVE_INT;
}
public static LongFunction toPrimitiveLong()
{
return TO_PRIMITIVE_LONG;
}
public static ShortFunction toPrimitiveShort()
{
return TO_PRIMITIVE_SHORT;
}
public static IntegerFunctionImpl length()
{
return LENGTH;
}
public static Function firstLetter()
{
return FIRST_LETTER;
}
public static Function subString(int beginIndex, int endIndex)
{
return new SubStringFunction(beginIndex, endIndex);
}
/**
* Returns a function that returns a copy of a {@link String}, with leading and trailing whitespace
* omitted.
*
* @see String#trim()
*/
public static Function trim()
{
return TRIM;
}
public static Function append(String valueToAppend)
{
return new AppendFunction(valueToAppend);
}
public static Function prepend(String valueToPrepend)
{
return new PrependFunction(valueToPrepend);
}
private static final class ToUpperCaseFunction implements Function
{
private static final long serialVersionUID = 1L;
public String valueOf(String object)
{
return object.toUpperCase();
}
@Override
public String toString()
{
return "string.toUpperCase()";
}
}
private static final class ToLowerCaseFunction implements Function
{
private static final long serialVersionUID = 1L;
public String valueOf(String object)
{
return object.toLowerCase();
}
@Override
public String toString()
{
return "string.toLowerCase()";
}
}
private static final class LengthFunction extends IntegerFunctionImpl
{
private static final long serialVersionUID = 1L;
public int intValueOf(String string)
{
return string.length();
}
@Override
public String toString()
{
return "string.length()";
}
}
private static final class TrimFunction implements Function
{
private static final long serialVersionUID = 1L;
public String valueOf(String string)
{
return string.trim();
}
@Override
public String toString()
{
return "string.trim()";
}
}
private static final class FirstLetterFunction
implements Function
{
private static final long serialVersionUID = 1L;
public Character valueOf(String object)
{
return object == null || object.length() < 1 ? null : object.charAt(0);
}
}
private static final class ToIntegerFunction implements Function
{
private static final long serialVersionUID = 1L;
public Integer valueOf(String string)
{
return Integer.valueOf(string);
}
}
private static final class ToPrimitiveBooleanFunction implements BooleanFunction
{
private static final long serialVersionUID = 1L;
public boolean booleanValueOf(String string)
{
return Boolean.parseBoolean(string);
}
}
private static final class ToPrimitiveByteFunction implements ByteFunction
{
private static final long serialVersionUID = 1L;
public byte byteValueOf(String string)
{
return Byte.parseByte(string);
}
}
private static final class ToFirstCharFunction implements CharFunction
{
private static final long serialVersionUID = 1L;
public char charValueOf(String string)
{
return string.charAt(0);
}
}
private static final class ToPrimitiveCharFunction implements CharFunction
{
private static final long serialVersionUID = 1L;
public char charValueOf(String string)
{
return (char) Integer.parseInt(string);
}
}
private static final class ToPrimitiveDoubleFunction implements DoubleFunction
{
private static final long serialVersionUID = 1L;
public double doubleValueOf(String string)
{
return Double.parseDouble(string);
}
}
private static final class ToPrimitiveFloatFunction implements FloatFunction
{
private static final long serialVersionUID = 1L;
public float floatValueOf(String string)
{
return Float.parseFloat(string);
}
}
private static final class ToPrimitiveIntFunction implements IntFunction
{
private static final long serialVersionUID = 1L;
public int intValueOf(String string)
{
return Integer.parseInt(string);
}
}
private static final class ToPrimitiveLongFunction implements LongFunction
{
private static final long serialVersionUID = 1L;
public long longValueOf(String string)
{
return Long.parseLong(string);
}
}
private static final class ToPrimitiveShortFunction implements ShortFunction
{
private static final long serialVersionUID = 1L;
public short shortValueOf(String string)
{
return Short.parseShort(string);
}
}
private static final class SubStringFunction implements Function
{
private static final long serialVersionUID = 1L;
private final int beginIndex;
private final int endIndex;
private SubStringFunction(int beginIndex, int endIndex)
{
this.beginIndex = beginIndex;
this.endIndex = endIndex;
}
public String valueOf(String string)
{
return string.substring(this.beginIndex, this.endIndex);
}
@Override
public String toString()
{
return "string.subString(" + this.beginIndex + ',' + this.endIndex + ')';
}
}
private static final class AppendFunction implements Function
{
private static final long serialVersionUID = 1L;
private final String valueToAppend;
private AppendFunction(String valueToAppend)
{
this.valueToAppend = valueToAppend;
}
public String valueOf(String string)
{
return string + this.valueToAppend;
}
}
private static final class PrependFunction implements Function
{
private static final long serialVersionUID = 1L;
private final String valueToPrepend;
private PrependFunction(String valueToPrepend)
{
this.valueToPrepend = valueToPrepend;
}
public String valueOf(String string)
{
return this.valueToPrepend + string;
}
}
}