javatools.datatypes

Class StringModifier

java.lang.Object

javatools.datatypes.StringModifier

public abstract class StringModifier
extends Object

Copyright 2016 Fabian M. Suchanek 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. This class is a collection of additional string modification methods. For instance, it provides methods to generate a string from an array, separating array elements by a given delimiter; String array[]={"cat", "mouse", "cheese"}; String imploded=StringModifier.implode(array," eats "); System.out.println(imploded); -> cat eats mouse eats cheese; imploded=StringModifier.implode(array,","); System.out.println(imploded); -> cat,mouse,cheese; This is helpfull for instance to generate a list of values for database insertion; note that there is also a version of that functionality that makes sure the array strings are all formated for database insertion/queries (e.g. put in quotations).

Constructor Summary

Constructors

Constructor and Description
StringModifier()

Method Summary

Modifier and Type	Method and Description
static boolean	areEqual(String s1, String s2) checks for equality between two potential strings
static String	implode(Collection<?> col, String delim)
static String	implode(String[] array, String delim)
static String	implodeForDB(Collection<?> col, String delim, Database database)
static String	implodeForDB(Iterator<?> it, String delim, Database database)
static <T,K> String	implodeForDB(Iterator<Map.Entry<T,K>> it, String keyValueDelim, String pairDelim, Database database, boolean formatKey, boolean formatValue) Concatenates key value pairs of a Map.Entry iterator into a combined String, separating each key from its value by a key-value delimeter and each key-value pair by pair delimeter while optionally applying the database.format function to each key/value
static String	implodeForDB(Map<?,?> map, String keyValueDelim, String pairDelim, Database database, boolean formatKey, boolean formatValue) Concatenates key value pairs of a Map into a combined String, separating each key from its value by a key-value delimeter and each key-value pair by pair delimeter while optionally applying the database.format function to each key/value
static <T> String	implodeForDB(T[] col, String delim, Database database)
static String	implodeForDBAsConditions(Map<?,?> map, Database database) Concatenates key value pairs of a Map into a combined String representing the pairs as independent column conditions for a database query, applying the database.format function to each value
static String	limitLength(String s, int length) limits the length of a String to the given size ie applies s.substring(0,length) for given length iff length<s.length()
static Set<String>	lowercase(String... ar) applies lowercase to all Strings in an array, returns them as a set
static void	main(String[] argv) Test method
static Set<String>	toNGram(String original, int n) produces an n-gram set from the string
static Map<String,Double>	toWeighedNGram(String original, int n) produces a weighed n-gram set from the string

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StringModifier

public StringModifier()

Method Detail

implode

public static String implode(String[] array,
                             String delim)

implode

public static String implode(Collection<?> col,
                             String delim)

implodeForDB

public static String implodeForDB(Collection<?> col,
                                  String delim,
                                  Database database)

implodeForDB

public static String implodeForDB(Iterator<?> it,
                                  String delim,
                                  Database database)

implodeForDB

public static <T> String implodeForDB(T[] col,
                                      String delim,
                                      Database database)

implodeForDBAsConditions

public static String implodeForDBAsConditions(Map<?,?> map,
                                              Database database)

Concatenates key value pairs of a Map into a combined String representing the pairs as independent column conditions for a database query, applying the database.format function to each value

Parameters:

map - the Map to be imploded

database - the Database instance for which the pairs shall be formatted

implodeForDB

public static String implodeForDB(Map<?,?> map,
                                  String keyValueDelim,
                                  String pairDelim,
                                  Database database,
                                  boolean formatKey,
                                  boolean formatValue)

Concatenates key value pairs of a Map into a combined String, separating each key from its value by a key-value delimeter and each key-value pair by pair delimeter while optionally applying the database.format function to each key/value

Parameters:

map - the Map to be imploded

keyValueDelim - delimeter inserted between each key and its value

pairDelim - delimeter inserted between key-value pairs

database - the Database instance for which the pairs shall be formatted

formatKey - flag indicating whether to format the keys with database.format

formatValue - flag indicating whether to format the values with database.format

implodeForDB

public static <T,K> String implodeForDB(Iterator<Map.Entry<T,K>> it,
                                        String keyValueDelim,
                                        String pairDelim,
                                        Database database,
                                        boolean formatKey,
                                        boolean formatValue)

Concatenates key value pairs of a Map.Entry iterator into a combined String, separating each key from its value by a key-value delimeter and each key-value pair by pair delimeter while optionally applying the database.format function to each key/value

Parameters:

it - the Map.Entry iterator

keyValueDelim - delimeter inserted between each key and its value

pairDelim - delimeter inserted between key-value pairs

database - the Database instance for which the pairs shall be formatted

formatKey - flag indicating whether to format the keys with database.format

formatValue - flag indicating whether to format the values with database.format

limitLength

public static String limitLength(String s,
                                 int length)

limits the length of a String to the given size ie applies s.substring(0,length) for given length iff length<s.length()

toNGram

public static Set<String> toNGram(String original,
                                  int n)

produces an n-gram set from the string

Parameters:

original - the String to be split into n-grams of size n

n - size of the n-grams

Returns:

set of n-grams

toWeighedNGram

public static Map<String,Double> toWeighedNGram(String original,
                                                int n)

produces a weighed n-gram set from the string

Parameters:

original - the String to be split into n-grams of size n

n - size of the n-grams

Returns:

map of n-grams with their weight (frequency/overall number of ngrams)

lowercase

public static final Set<String> lowercase(String... ar)

applies lowercase to all Strings in an array, returns them as a set

areEqual

public static final boolean areEqual(String s1,
                                     String s2)

checks for equality between two potential strings

main

public static void main(String[] argv)
                 throws Exception

Test method

Throws:

Exception