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com.landawn.abacus.util.Splitter Maven / Gradle / Ivy
/*
* Copyright (C) 2016 HaiYang Li
*
* 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.landawn.abacus.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.landawn.abacus.type.Type;
import com.landawn.abacus.util.function.Supplier;
import com.landawn.abacus.util.stream.EntryStream;
import com.landawn.abacus.util.stream.ObjIteratorEx;
import com.landawn.abacus.util.stream.Stream;
/**
*
* @since 0.8
*
* @author Haiyang Li
*/
public final class Splitter {
public static final Pattern WHITE_SPACE_PATTERN = Pattern.compile("\\s+");
private static final SubStringFunc defaultSubStringFunc = new SubStringFunc() {
@Override
public String subString(CharSequence source, int start, int end) {
return source.subSequence(start, end).toString();
}
};
private static final SubStringFunc trimSubStringFunc = new SubStringFunc() {
@Override
public String subString(CharSequence source, int start, int end) {
while (start < end && source.charAt(start) == ' ') {
start++;
}
while (end > start && source.charAt(end - 1) == ' ') {
end--;
}
return start >= end ? N.EMPTY_STRING : source.subSequence(start, end).toString();
}
};
private static final SubStringFunc stripSubStringFunc = new SubStringFunc() {
@Override
public String subString(CharSequence source, int start, int end) {
while (start < end && Character.isWhitespace(source.charAt(start))) {
start++;
}
while (end > start && Character.isWhitespace(source.charAt(end - 1))) {
end--;
}
return start >= end ? N.EMPTY_STRING : source.subSequence(start, end).toString();
}
};
private final Strategy strategy;
private boolean omitEmptyStrings = false;
private boolean trim = false;
private boolean strip = false;
private int limit = Integer.MAX_VALUE;
Splitter(Strategy strategy) {
this.strategy = strategy;
}
/**
* Returns the Splitter with the default delimiter: ", "
*
* @return
*/
public static Splitter defauLt() {
return with(Joiner.DEFAULT_DELIMITER);
}
public static Splitter with(final char delimiter) {
return new Splitter(new Strategy() {
@Override
public ObjIterator split(final CharSequence source, final boolean omitEmptyStrings, final boolean trim, final boolean strip,
final int limit) {
if (source == null) {
return ObjIterator.empty();
}
return new ObjIterator() {
private final SubStringFunc subStringFunc = strip ? stripSubStringFunc : (trim ? trimSubStringFunc : defaultSubStringFunc);
private final int sourceLen = source.length();
private String next = null;
private int start = 0;
private int cursor = 0;
private int cnt = 0;
@Override
public boolean hasNext() {
if (next == null && (cursor >= 0 && cursor <= sourceLen)) {
if (limit - cnt == 1) {
next = subStringFunc.subString(source, start, sourceLen);
start = (cursor = sourceLen + 1);
if (omitEmptyStrings && next.length() == 0) {
next = null;
}
} else {
while (cursor >= 0 && cursor <= sourceLen) {
if (cursor == sourceLen || source.charAt(cursor) == delimiter) {
next = subStringFunc.subString(source, start, cursor);
start = ++cursor;
if (omitEmptyStrings && next.length() == 0) {
next = null;
}
if (next != null) {
break;
}
} else {
cursor++;
}
}
}
}
return next != null;
}
@Override
public String next() {
if (hasNext() == false) {
throw new NoSuchElementException();
}
final String result = next;
next = null;
cnt++;
return result;
}
};
}
});
}
/**
*
* @param delimiter
* @return
* @throws IllegalArgumentException if the specified {@code delimiter} is null or empty.
*/
public static Splitter with(final CharSequence delimiter) throws IllegalArgumentException {
N.checkArgNotNullOrEmpty(delimiter, "delimiter");
if (N.isNullOrEmpty(delimiter)) {
return with(WHITE_SPACE_PATTERN);
} else if (delimiter.length() == 1) {
return with(delimiter.charAt(0));
} else {
return new Splitter(new Strategy() {
@Override
public ObjIterator split(final CharSequence source, final boolean omitEmptyStrings, final boolean trim, final boolean strip,
final int limit) {
if (source == null) {
return ObjIterator.empty();
}
return new ObjIterator() {
private final SubStringFunc subStringFunc = strip ? stripSubStringFunc : (trim ? trimSubStringFunc : defaultSubStringFunc);
@SuppressWarnings("deprecation")
private final char[] sourceChars = StringUtil.getCharsForReadOnly(source.toString());
@SuppressWarnings("deprecation")
private final char[] delimiterChars = StringUtil.getCharsForReadOnly(delimiter.toString());
private final int sourceLen = sourceChars.length;
private final int delimiterLen = delimiterChars.length;
private String next = null;
private int start = 0;
private int cursor = 0;
private int cnt = 0;
@Override
public boolean hasNext() {
if (next == null && (cursor >= 0 && cursor <= sourceLen)) {
if (limit - cnt == 1) {
next = subStringFunc.subString(source, start, sourceLen);
start = (cursor = sourceLen + 1);
if (omitEmptyStrings && next.length() == 0) {
next = null;
}
} else {
while (cursor >= 0 && cursor <= sourceLen) {
if (cursor > sourceLen - delimiterLen || (sourceChars[cursor] == delimiterChars[0] && match(cursor))) {
if (cursor > sourceLen - delimiterLen) {
next = subStringFunc.subString(source, start, sourceLen);
start = (cursor = sourceLen + 1);
} else {
next = subStringFunc.subString(source, start, cursor);
start = (cursor += delimiter.length());
}
if (omitEmptyStrings && next.length() == 0) {
next = null;
}
if (next != null) {
break;
}
} else {
cursor++;
}
}
}
}
return next != null;
}
@Override
public String next() {
if (hasNext() == false) {
throw new NoSuchElementException();
}
final String result = next;
next = null;
cnt++;
return result;
}
private boolean match(int cursor) {
for (int i = 1; i < delimiterLen; i++) {
if (sourceChars[cursor + i] != delimiterChars[i]) {
return false;
}
}
return true;
}
};
}
});
}
}
/**
*
* @param delimiter
* @return
* @throws IllegalArgumentException if the specified {@code delimiter} is null, or empty string may be matched by it.
*/
public static Splitter with(final Pattern delimiter) throws IllegalArgumentException {
N.checkArgNotNull(delimiter, "delimiter");
N.checkArgument(!delimiter.matcher("").matches(), "Empty string may be matched by pattern: %s", delimiter);
return new Splitter(new Strategy() {
@Override
public ObjIterator split(final CharSequence source, final boolean omitEmptyStrings, final boolean trim, final boolean strip,
final int limit) {
if (source == null) {
return ObjIterator.empty();
}
return new ObjIterator() {
private final SubStringFunc subStringFunc = strip ? stripSubStringFunc : (trim ? trimSubStringFunc : defaultSubStringFunc);
private final int sourceLen = source.length();
private final Matcher matcher = delimiter.matcher(source);
private String next = null;
private int start = 0;
private int cursor = 0;
private int cnt = 0;
private boolean matches = false;
@Override
public boolean hasNext() {
if (next == null && (cursor >= 0 && cursor <= sourceLen)) {
if (limit - cnt == 1) {
next = subStringFunc.subString(source, start, sourceLen);
start = (cursor = sourceLen + 1);
if (omitEmptyStrings && next.length() == 0) {
next = null;
}
} else {
while (cursor >= 0 && cursor <= sourceLen) {
if (cursor == sourceLen || (matches = matcher.find(start))) {
if (matches) {
next = subStringFunc.subString(source, start, matcher.start());
start = (cursor = matcher.end());
matches = false;
} else {
next = subStringFunc.subString(source, start, sourceLen);
start = (cursor = sourceLen + 1);
}
if (omitEmptyStrings && next.length() == 0) {
next = null;
}
if (next != null) {
break;
}
} else {
cursor++;
}
}
}
}
return next != null;
}
@Override
public String next() {
if (hasNext() == false) {
throw new NoSuchElementException();
}
final String result = next;
next = null;
cnt++;
return result;
}
};
}
});
}
/**
*
* @param delimiterRegex
* @return
* @throws IllegalArgumentException if the specified {@code delimiter} is null or empty, or empty string may be matched by it.
*/
public static Splitter pattern(CharSequence delimiterRegex) throws IllegalArgumentException {
N.checkArgNotNullOrEmpty(delimiterRegex, "delimiterRegex");
return with(Pattern.compile(delimiterRegex.toString()));
}
public Splitter omitEmptyStrings(boolean omitEmptyStrings) {
this.omitEmptyStrings = omitEmptyStrings;
return this;
}
public Splitter trim(boolean trim) {
this.trim = trim;
return this;
}
/**
* Removes the starting and ending white space characters if {@code strip} is true.
*
* @param strip
* @return
* @see Character#isWhitespace(char)
*/
public Splitter strip(boolean strip) {
this.strip = strip;
return this;
}
public Splitter limit(int limit) {
N.checkArgPositive(limit, "limit");
this.limit = limit;
return this;
}
public List split(final CharSequence source) {
final List result = new ArrayList<>();
split(result, source);
return result;
}
public List split(Class targetType, final CharSequence source) {
N.checkArgNotNull(targetType, "targetType");
final Type type = N.typeOf(targetType);
return split(type, source);
}
public List split(Type targetType, final CharSequence source) {
N.checkArgNotNull(targetType, "targetType");
final List result = new ArrayList<>();
split(result, targetType, source);
return result;
}
public > C split(final C output, final CharSequence source) {
N.checkArgNotNull(output, "output");
final ObjIterator iter = iterate(source);
while (iter.hasNext()) {
output.add(iter.next());
}
return output;
}
public > C split(final C output, Class targetType, final CharSequence source) {
N.checkArgNotNull(output, "output");
N.checkArgNotNull(targetType, "targetType");
final Type type = N.typeOf(targetType);
return split(output, type, source);
}
public > C split(final C output, Type targetType, final CharSequence source) {
N.checkArgNotNull(output, "output");
N.checkArgNotNull(targetType, "targetType");
final ObjIterator iter = iterate(source);
while (iter.hasNext()) {
output.add(targetType.valueOf(iter.next()));
}
return output;
}
public > C split(final CharSequence source, final Supplier supplier) {
return split(supplier.get(), source);
}
public > C split(Class targetType, final CharSequence source, final Supplier supplier) {
return split(supplier.get(), targetType, source);
}
public > C split(Type targetType, final CharSequence source, final Supplier supplier) {
return split(supplier.get(), targetType, source);
}
public String[] splitToArray(final CharSequence source) {
final List substrs = split(source);
return substrs.toArray(new String[substrs.size()]);
}
public T splitToArray(Class arrayType, final CharSequence source) {
N.checkArgNotNull(arrayType, "arrayType");
final Class eleCls = arrayType.getComponentType();
final List substrs = split(source);
if (eleCls.equals(String.class) || eleCls.equals(Object.class)) {
return (T) substrs.toArray((Object[]) N.newArray(eleCls, substrs.size()));
} else {
final Type eleType = N.typeOf(eleCls);
final Object a = N.newArray(eleCls, substrs.size());
if (Primitives.isPrimitiveType(eleCls)) {
for (int i = 0, len = substrs.size(); i < len; i++) {
Array.set(a, i, eleType.valueOf(substrs.get(i)));
}
} else {
final Object[] objArray = (Object[]) a;
for (int i = 0, len = substrs.size(); i < len; i++) {
objArray[i] = eleType.valueOf(substrs.get(i));
}
}
return (T) a;
}
}
public Stream splitToStream(final CharSequence source) {
return Stream.of(iterate(source));
}
public T splitAndThen(final CharSequence source, Try.Function, T, E> converter) throws E {
N.checkArgNotNull(converter, "converter");
return converter.apply(split(source));
}
ObjIterator iterate(final CharSequence source) {
return strategy.split(source, omitEmptyStrings, trim, strip, limit);
}
public static final class MapSplitter {
private final Splitter entrySplitter;
private final Splitter keyValueSplitter;
MapSplitter(Splitter entrySplitter, Splitter keyValueSplitter) {
this.entrySplitter = entrySplitter;
this.keyValueSplitter = keyValueSplitter;
}
/**
* Returns the Map Splitter with the default entry and key/value delimiter: ", " and "="
*
* @return
*/
public static MapSplitter defauLt() {
return with(Joiner.DEFAULT_DELIMITER, Joiner.DEFAULT_KEY_VALUE_DELIMITER);
}
/**
*
* @param entryDelimiter
* @param keyValueDelimiter
* @return
* @throws IllegalArgumentException if the specified {@code entryDelimiter/keyValueDelimiter} is null or empty.
* @see Splitter#with(CharSequence)
*/
public static MapSplitter with(final CharSequence entryDelimiter, final CharSequence keyValueDelimiter) throws IllegalArgumentException {
return new MapSplitter(Splitter.with(entryDelimiter), Splitter.with(keyValueDelimiter));
}
/**
*
* @param entryDelimiter
* @param keyValueDelimiter
* @return
* @throws IllegalArgumentException if the specified {@code entryDelimiter/keyValueDelimiter} is null, or empty string may be matched by one of them.
* @see Splitter#with(Pattern)
*/
public static MapSplitter with(final Pattern entryDelimiter, final Pattern keyValueDelimiter) throws IllegalArgumentException {
return new MapSplitter(Splitter.with(entryDelimiter), Splitter.with(keyValueDelimiter));
}
/**
*
* @param entryDelimiterRegex
* @param keyValueDelimiterRegex
* @return
* @throws IllegalArgumentException if the specified {@code entryDelimiterRegex/keyValueDelimiterRegex} is null or empty, or empty string may be matched by one of them.
* @see Splitter#pattern(CharSequence)
*/
public static MapSplitter pattern(CharSequence entryDelimiterRegex, CharSequence keyValueDelimiterRegex) throws IllegalArgumentException {
return new MapSplitter(Splitter.pattern(entryDelimiterRegex), Splitter.pattern(keyValueDelimiterRegex));
}
public MapSplitter omitEmptyStrings(boolean omitEmptyStrings) {
keyValueSplitter.omitEmptyStrings(omitEmptyStrings);
return this;
}
public MapSplitter trim(boolean trim) {
entrySplitter.trim(trim);
keyValueSplitter.trim(trim);
return this;
}
/**
* Removes the starting and ending white space characters if {@code strip} is true.
*
* @param strip
* @return
* @see Character#isWhitespace(char)
*/
public MapSplitter strip(boolean strip) {
entrySplitter.strip(strip);
keyValueSplitter.strip(strip);
return this;
}
public MapSplitter limit(int limit) {
N.checkArgPositive(limit, "limit");
entrySplitter.limit(limit);
return this;
}
public Map split(final CharSequence source) {
return split(new LinkedHashMap(), source);
}
public Map split(Class keyType, Class valueType, final CharSequence source) {
N.checkArgNotNull(keyType, "keyType");
N.checkArgNotNull(valueType, "valueType");
final Type typeOfKey = N.typeOf(keyType);
final Type typeOfValue = N.typeOf(valueType);
return split(typeOfKey, typeOfValue, source);
}
public Map split(Type keyType, Type valueType, final CharSequence source) {
N.checkArgNotNull(keyType, "keyType");
N.checkArgNotNull(valueType, "valueType");
return split(new LinkedHashMap(), keyType, valueType, source);
}
public > M split(final M output, final CharSequence source) {
N.checkArgNotNull(output, "output");
entrySplitter.omitEmptyStrings(true);
keyValueSplitter.limit(2);
final ObjIterator iter = entrySplitter.iterate(source);
ObjIterator keyValueIter = null;
String entryString = null;
String key = null;
String value = null;
while (iter.hasNext()) {
entryString = iter.next();
keyValueIter = keyValueSplitter.iterate(entryString);
if (keyValueIter.hasNext()) {
key = keyValueIter.next();
if (keyValueIter.hasNext()) {
value = keyValueIter.next();
} else {
throw new IllegalArgumentException("Invalid map entry String: " + entryString);
}
if (keyValueIter.hasNext()) {
throw new IllegalArgumentException("Invalid map entry String: " + entryString);
} else {
output.put(key, value);
}
}
}
return output;
}
public > M split(final M output, Class keyType, Class valueType, final CharSequence source) {
N.checkArgNotNull(output, "output");
N.checkArgNotNull(keyType, "keyType");
N.checkArgNotNull(valueType, "valueType");
final Type typeOfKey = N.typeOf(keyType);
final Type typeOfValue = N.typeOf(valueType);
return split(output, typeOfKey, typeOfValue, source);
}
public > M split(final M output, Type keyType, Type valueType, final CharSequence source) {
N.checkArgNotNull(output, "output");
N.checkArgNotNull(keyType, "keyType");
N.checkArgNotNull(valueType, "valueType");
entrySplitter.omitEmptyStrings(true);
keyValueSplitter.limit(2);
final ObjIterator iter = entrySplitter.iterate(source);
ObjIterator keyValueIter = null;
String entryString = null;
String key = null;
String value = null;
while (iter.hasNext()) {
entryString = iter.next();
keyValueIter = keyValueSplitter.iterate(entryString);
if (keyValueIter.hasNext()) {
key = keyValueIter.next();
if (keyValueIter.hasNext()) {
value = keyValueIter.next();
} else {
throw new IllegalArgumentException("Invalid map entry String: " + entryString);
}
if (keyValueIter.hasNext()) {
throw new IllegalArgumentException("Invalid map entry String: " + entryString);
} else {
output.put(keyType.valueOf(key), valueType.valueOf(value));
}
}
}
return output;
}
public > M split(final CharSequence source, final Supplier supplier) {
return split(supplier.get(), source);
}
public > M split(final Class keyType, final Class valueType, final CharSequence source,
final Supplier supplier) {
return split(supplier.get(), keyType, valueType, source);
}
public > M split(final Type keyType, final Type valueType, final CharSequence source,
final Supplier supplier) {
return split(supplier.get(), keyType, valueType, source);
}
public Stream> splitToStream(final CharSequence source) {
entrySplitter.omitEmptyStrings(true);
keyValueSplitter.limit(2);
return Stream.of(new ObjIteratorEx>() {
private final ObjIterator iter = entrySplitter.iterate(source);
private ObjIterator keyValueIter = null;
private String entryString = null;
private String key = null;
private String value = null;
private Map.Entry next;
@Override
public boolean hasNext() {
if (next == null) {
while (iter.hasNext()) {
entryString = iter.next();
keyValueIter = keyValueSplitter.iterate(entryString);
if (keyValueIter.hasNext()) {
key = keyValueIter.next();
if (keyValueIter.hasNext()) {
value = keyValueIter.next();
} else {
throw new IllegalArgumentException("Invalid map entry String: " + entryString);
}
if (keyValueIter.hasNext()) {
throw new IllegalArgumentException("Invalid map entry String: " + entryString);
} else {
next = new ImmutableEntry<>(key, value);
break;
}
}
}
}
return next != null;
}
@Override
public Map.Entry next() {
if (hasNext() == false) {
throw new NoSuchElementException();
}
final Map.Entry result = next;
next = null;
return result;
}
});
}
public EntryStream splitToEntryStream(final CharSequence source) {
return splitToStream(source).mapToEntry(Fn.> identity());
}
public T splitAndThen(final CharSequence source, Try.Function, T, E> converter) throws E {
return converter.apply(split(source));
}
}
static interface Strategy {
ObjIterator split(CharSequence toSplit, boolean omitEmptyStrings, boolean trim, final boolean strip, int limit);
}
static interface SubStringFunc {
String subString(CharSequence source, int start, int end);
}
}
