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A general programming library in Java
/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.landawn.abacus.util;
import java.util.Collection;
import java.util.Map;
import com.landawn.abacus.util.stream.Stream;
/**
*
* @author haiyangl
*
*/
public class Joiner implements AutoCloseable {
public static final String DEFAULT_DELIMITER = N.ELEMENT_SEPARATOR;
public static final String DEFAULT_KEY_VALUE_DELIMITER = "=";
private final String prefix;
private final String delimiter;
private final String keyValueDelimiter;
private final String suffix;
private final boolean isEmptyDelimiter;
private final boolean isEmptyKeyValueDelimiter;
private boolean trim = false;
private boolean skipNull = false;
private boolean useCachedBuffer = false;
private String nullText = N.NULL_STRING;
/*
* StringBuilder value -- at any time, the characters constructed from the
* prefix, the added element separated by the delimiter, but without the
* suffix, so that we can more easily add elements without having to jigger
* the suffix each time.
*/
private StringBuilder buffer;
/*
* By default, the string consisting of prefix+suffix, returned by
* toString(), or properties of value, when no elements have yet been added,
* i.e. when it is empty. This may be overridden by the user to be some
* other value including the empty String.
*/
private String emptyValue;
/**
* Constructs a {@code StringJoiner} with no characters in it, with no
* {@code prefix} or {@code suffix}, and a copy of the supplied
* {@code delimiter}.
* If no characters are added to the {@code StringJoiner} and methods
* accessing the value of it are invoked, it will not return a
* {@code prefix} or {@code suffix} (or properties thereof) in the result,
* unless {@code setEmptyValue} has first been called.
*
* @param delimiter the sequence of characters to be used between each
* element added to the {@code StringJoiner} value
* @throws NullPointerException if {@code delimiter} is {@code null}
*/
Joiner(CharSequence delimiter) {
this(delimiter, DEFAULT_KEY_VALUE_DELIMITER);
}
Joiner(final CharSequence delimiter, CharSequence keyValueDelimiter) {
this(delimiter, keyValueDelimiter, "", "");
}
/**
* Constructs a {@code StringJoiner} with no characters in it using copies
* of the supplied {@code prefix}, {@code delimiter} and {@code suffix}.
* If no characters are added to the {@code StringJoiner} and methods
* accessing the string value of it are invoked, it will return the
* {@code prefix + suffix} (or properties thereof) in the result, unless
* {@code setEmptyValue} has first been called.
*
* @param delimiter the sequence of characters to be used between each
* element added to the {@code StringJoiner}
* @param prefix the sequence of characters to be used at the beginning
* @param suffix the sequence of characters to be used at the end
* @throws NullPointerException if {@code prefix}, {@code delimiter}, or
* {@code suffix} is {@code null}
*/
Joiner(CharSequence delimiter, CharSequence prefix, CharSequence suffix) {
this(delimiter, DEFAULT_KEY_VALUE_DELIMITER, prefix, suffix);
}
Joiner(CharSequence delimiter, CharSequence keyValueDelimiter, CharSequence prefix, CharSequence suffix) {
N.checkArgNotNull(prefix, "The prefix must not be null");
N.checkArgNotNull(delimiter, "The delimiter must not be null");
N.checkArgNotNull(keyValueDelimiter, "The keyValueDelimiter must not be null");
N.checkArgNotNull(suffix, "The suffix must not be null");
// make defensive copies of arguments
this.prefix = prefix.toString();
this.delimiter = delimiter.toString();
this.keyValueDelimiter = keyValueDelimiter.toString();
this.suffix = suffix.toString();
this.emptyValue = this.prefix + this.suffix;
this.isEmptyDelimiter = N.isNullOrEmpty(delimiter);
this.isEmptyKeyValueDelimiter = N.isNullOrEmpty(keyValueDelimiter);
}
/**
* Returns the Map Splitter with the default element and key/value delimiter: ", " and "="
*
* @return
*/
public static Joiner defauLt() {
return with(DEFAULT_DELIMITER, DEFAULT_KEY_VALUE_DELIMITER);
}
public static Joiner with(final CharSequence delimiter) {
return new Joiner(delimiter);
}
public static Joiner with(final CharSequence delimiter, CharSequence keyValueDelimiter) {
return new Joiner(delimiter, keyValueDelimiter);
}
public static Joiner with(CharSequence delimiter, CharSequence prefix, CharSequence suffix) {
return new Joiner(delimiter, prefix, suffix);
}
public static Joiner with(CharSequence delimiter, CharSequence keyValueDelimiter, CharSequence prefix, CharSequence suffix) {
return new Joiner(delimiter, keyValueDelimiter, prefix, suffix);
}
/**
* Sets the sequence of characters to be used when determining the string
* representation of this {@code StringJoiner} and no elements have been
* added yet, that is, when it is empty. A copy of the {@code emptyValue}
* parameter is made for this purpose. Note that once an add method has been
* called, the {@code StringJoiner} is no longer considered empty, even if
* the element(s) added correspond to the empty {@code String}.
*
* @param emptyValue the characters to return as the value of an empty
* {@code StringJoiner}
* @return this {@code StringJoiner} itself so the calls may be chained
* @throws NullPointerException when the {@code emptyValue} parameter is
* {@code null}
*/
public Joiner setEmptyValue(CharSequence emptyValue) {
this.emptyValue = N.checkArgNotNull(emptyValue, "The empty value must not be null").toString();
return this;
}
public Joiner trim(boolean trim) {
this.trim = trim;
return this;
}
/**
* Ignore the {@code null} element/value for {@code key/value, Map, Entity} when the specified {@code element} or {@code value} is {@code null} if it's set to {@code true}.
*
* @param skipNull
* @return
*/
public Joiner skipNull(boolean skipNull) {
this.skipNull = skipNull;
return this;
}
public Joiner useForNull(String nullText) {
this.nullText = nullText == null ? N.NULL_STRING : nullText;
return this;
}
/**
* Get the {@code StringBuilder} from object factory to improve performance if it's set to true, and must remember to call {@code toString()/map()/mapIfNotEmpty()/stream()/streamIfNotEmpty()} or {@code close()} to recycle the {@code StringBuilder}.
*
* @param reuseStringBuilder
* @return
* @deprecated replaced by {@code #reuseCachedBuffer(boolean)}
*/
@Deprecated
public Joiner reuseStringBuilder(boolean reuseStringBuilder) {
if (buffer != null) {
throw new IllegalStateException("Can't reset because the StringBuilder has been created");
}
this.useCachedBuffer = reuseStringBuilder;
return this;
}
/**
* Improving performance by set {@code useCachedBuffer=true}, and must remember to call {@code toString()/map()/mapIfNotEmpty()/stream()/streamIfNotEmpty()} or {@code close()} to recycle the cached buffer.
*
* @param useCachedBuffer
* @return
*/
public Joiner reuseCachedBuffer(boolean useCachedBuffer) {
if (buffer != null) {
throw new IllegalStateException("Can't reset because the buffer has been created");
}
this.useCachedBuffer = useCachedBuffer;
return this;
}
public Joiner append(boolean element) {
prepareBuilder().append(element);
return this;
}
public Joiner append(char element) {
prepareBuilder().append(element);
return this;
}
public Joiner append(int element) {
prepareBuilder().append(element);
return this;
}
public Joiner append(long element) {
prepareBuilder().append(element);
return this;
}
public Joiner append(float element) {
prepareBuilder().append(element);
return this;
}
public Joiner append(double element) {
prepareBuilder().append(element);
return this;
}
public Joiner append(String element) {
if (element != null || skipNull == false) {
prepareBuilder().append(element == null ? nullText : (trim ? element.trim() : element));
}
return this;
}
public Joiner append(CharSequence element) {
if (element != null || skipNull == false) {
prepareBuilder().append(element == null ? nullText : (trim ? element.toString().trim() : element));
}
return this;
}
public Joiner append(CharSequence element, final int start, final int end) {
if (element != null || skipNull == false) {
if (element == null) {
prepareBuilder().append(nullText);
} else if (trim) {
prepareBuilder().append(element.subSequence(start, end).toString().trim());
} else {
prepareBuilder().append(element, start, end);
}
}
return this;
}
public Joiner append(StringBuffer element) {
if (element != null || skipNull == false) {
if (element == null) {
prepareBuilder().append(nullText);
} else {
prepareBuilder().append(element);
}
}
return this;
}
public Joiner append(char[] element) {
if (element != null || skipNull == false) {
if (element == null) {
prepareBuilder().append(nullText);
} else {
prepareBuilder().append(element);
}
}
return this;
}
public Joiner append(char[] element, final int offset, final int len) {
if (element != null || skipNull == false) {
if (element == null) {
prepareBuilder().append(nullText);
} else {
prepareBuilder().append(element, offset, len);
}
}
return this;
}
public Joiner append(Object element) {
if (element != null || skipNull == false) {
prepareBuilder().append(toString(element));
}
return this;
}
public Joiner append(String key, boolean value) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value);
}
return this;
}
public Joiner append(String key, char value) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value);
}
return this;
}
public Joiner append(String key, int value) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value);
}
return this;
}
public Joiner append(String key, long value) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value);
}
return this;
}
public Joiner append(String key, float value) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value);
}
return this;
}
public Joiner append(String key, double value) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value);
}
return this;
}
public Joiner append(String key, String value) {
if (value != null || skipNull == false) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value == null ? nullText : (trim ? value.trim() : value));
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value == null ? nullText : (trim ? value.trim() : value));
}
}
return this;
}
public Joiner append(String key, CharSequence value) {
if (value != null || skipNull == false) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value == null ? nullText : (trim ? value.toString().trim() : value));
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value == null ? nullText : (trim ? value.toString().trim() : value));
}
}
return this;
}
public Joiner append(String key, StringBuffer value) {
if (value != null || skipNull == false) {
if (value == null) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(nullText);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(nullText);
}
} else {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value);
}
}
}
return this;
}
public Joiner append(String key, char[] value) {
if (value != null || skipNull == false) {
if (value == null) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(nullText);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(nullText);
}
} else {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(value);
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(value);
}
}
}
return this;
}
public Joiner append(String key, Object value) {
if (value != null || skipNull == false) {
if (isEmptyKeyValueDelimiter) {
prepareBuilder().append(key).append(toString(value));
} else {
prepareBuilder().append(key).append(keyValueDelimiter).append(toString(value));
}
}
return this;
}
public Joiner appendEntry(Map.Entry entry) {
if (skipNull == false || (entry != null && entry.getValue() != null)) {
if (entry == null) {
append(nullText);
} else {
append(toString(entry.getKey()), toString(entry.getValue()));
}
}
return this;
}
public Joiner appendIf(boolean b, Object element) {
if (b) {
append(element);
}
return this;
}
public Joiner appendIf(boolean b, String key, Object value) {
if (b) {
append(key, value);
}
return this;
}
public Joiner appendEntryIf(boolean b, Map.Entry entry) {
if (b) {
appendEntry(entry);
}
return this;
}
public Joiner appendAll(final boolean[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final boolean[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (sb == null) {
sb = prepareBuilder().append(a[i]);
} else {
if (isEmptyDelimiter) {
sb.append(a[i]);
} else {
sb.append(delimiter).append(a[i]);
}
}
}
return this;
}
public Joiner appendAll(final char[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final char[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (sb == null) {
sb = prepareBuilder().append(a[i]);
} else {
if (isEmptyDelimiter) {
sb.append(a[i]);
} else {
sb.append(delimiter).append(a[i]);
}
}
}
return this;
}
public Joiner appendAll(final byte[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final byte[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (sb == null) {
sb = prepareBuilder().append(a[i]);
} else {
if (isEmptyDelimiter) {
sb.append(a[i]);
} else {
sb.append(delimiter).append(a[i]);
}
}
}
return this;
}
public Joiner appendAll(final short[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final short[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (sb == null) {
sb = prepareBuilder().append(a[i]);
} else {
if (isEmptyDelimiter) {
sb.append(a[i]);
} else {
sb.append(delimiter).append(a[i]);
}
}
}
return this;
}
public Joiner appendAll(final int[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final int[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (sb == null) {
sb = prepareBuilder().append(a[i]);
} else {
if (isEmptyDelimiter) {
sb.append(a[i]);
} else {
sb.append(delimiter).append(a[i]);
}
}
}
return this;
}
public Joiner appendAll(final long[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final long[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (sb == null) {
sb = prepareBuilder().append(a[i]);
} else {
if (isEmptyDelimiter) {
sb.append(a[i]);
} else {
sb.append(delimiter).append(a[i]);
}
}
}
return this;
}
public Joiner appendAll(final float[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final float[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (sb == null) {
sb = prepareBuilder().append(a[i]);
} else {
if (isEmptyDelimiter) {
sb.append(a[i]);
} else {
sb.append(delimiter).append(a[i]);
}
}
}
return this;
}
public Joiner appendAll(final double[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final double[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (sb == null) {
sb = prepareBuilder().append(a[i]);
} else {
if (isEmptyDelimiter) {
sb.append(a[i]);
} else {
sb.append(delimiter).append(a[i]);
}
}
}
return this;
}
public Joiner appendAll(final Object[] a) {
if (N.notNullOrEmpty(a)) {
return appendAll(a, 0, a.length);
}
return this;
}
public Joiner appendAll(final Object[] a, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, a == null ? 0 : a.length);
if (N.isNullOrEmpty(a) || fromIndex == toIndex) {
return this;
}
StringBuilder sb = null;
for (int i = fromIndex; i < toIndex; i++) {
if (a[i] != null || skipNull == false) {
if (sb == null) {
sb = prepareBuilder().append(toString(a[i]));
} else {
if (isEmptyDelimiter) {
sb.append(toString(a[i]));
} else {
sb.append(delimiter).append(toString(a[i]));
}
}
}
}
return this;
}
public Joiner appendAll(final BooleanList c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c.array(), 0, c.size());
}
return this;
}
public Joiner appendAll(final BooleanList c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || fromIndex == toIndex) {
return this;
}
return appendAll(c.array(), fromIndex, toIndex);
}
public Joiner appendAll(final CharList c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c.array(), 0, c.size());
}
return this;
}
public Joiner appendAll(final CharList c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || fromIndex == toIndex) {
return this;
}
return appendAll(c.array(), fromIndex, toIndex);
}
public Joiner appendAll(final ByteList c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c.array(), 0, c.size());
}
return this;
}
public Joiner appendAll(final ByteList c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || fromIndex == toIndex) {
return this;
}
return appendAll(c.array(), fromIndex, toIndex);
}
public Joiner appendAll(final ShortList c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c.array(), 0, c.size());
}
return this;
}
public Joiner appendAll(final ShortList c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || fromIndex == toIndex) {
return this;
}
return appendAll(c.array(), fromIndex, toIndex);
}
public Joiner appendAll(final IntList c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c.array(), 0, c.size());
}
return this;
}
public Joiner appendAll(final IntList c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || fromIndex == toIndex) {
return this;
}
return appendAll(c.array(), fromIndex, toIndex);
}
public Joiner appendAll(final LongList c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c.array(), 0, c.size());
}
return this;
}
public Joiner appendAll(final LongList c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || fromIndex == toIndex) {
return this;
}
return appendAll(c.array(), fromIndex, toIndex);
}
public Joiner appendAll(final FloatList c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c.array(), 0, c.size());
}
return this;
}
public Joiner appendAll(final FloatList c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || fromIndex == toIndex) {
return this;
}
return appendAll(c.array(), fromIndex, toIndex);
}
public Joiner appendAll(final DoubleList c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c.array(), 0, c.size());
}
return this;
}
public Joiner appendAll(final DoubleList c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || fromIndex == toIndex) {
return this;
}
return appendAll(c.array(), fromIndex, toIndex);
}
public Joiner appendAll(final Collection c) {
if (N.notNullOrEmpty(c)) {
return appendAll(c, 0, c.size());
}
return this;
}
public Joiner appendAll(final Collection c, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, c == null ? 0 : c.size());
if (N.isNullOrEmpty(c) || (fromIndex == toIndex && fromIndex < c.size())) {
return this;
}
StringBuilder sb = null;
int i = 0;
for (Object e : c) {
if (i++ < fromIndex) {
continue;
}
if (e != null || skipNull == false) {
if (sb == null) {
sb = prepareBuilder().append(toString(e));
} else {
if (isEmptyDelimiter) {
sb.append(toString(e));
} else {
sb.append(delimiter).append(toString(e));
}
}
}
if (i >= toIndex) {
break;
}
}
return this;
}
public Joiner appendEntries(final Map m) {
if (N.notNullOrEmpty(m)) {
return appendEntries(m, 0, m.size());
}
return this;
}
public Joiner appendEntries(final Map m, final int fromIndex, final int toIndex) {
N.checkFromToIndex(fromIndex, toIndex, m == null ? 0 : m.size());
if ((N.isNullOrEmpty(m) && fromIndex == 0 && toIndex == 0) || (fromIndex == toIndex && fromIndex < m.size())) {
return this;
}
StringBuilder sb = null;
int i = 0;
for (Map.Entry entry : m.entrySet()) {
if (i++ < fromIndex) {
continue;
}
if (entry.getValue() != null || skipNull == false) {
if (sb == null) {
sb = prepareBuilder().append(toString(entry.getKey())).append(keyValueDelimiter).append(toString(entry.getValue()));
} else {
if (isEmptyDelimiter) {
sb.append(toString(entry.getKey()));
} else {
sb.append(delimiter).append(toString(entry.getKey()));
}
if (isEmptyKeyValueDelimiter) {
sb.append(toString(entry.getValue()));
} else {
sb.append(keyValueDelimiter).append(toString(entry.getValue()));
}
}
}
if (i >= toIndex) {
break;
}
}
return this;
}
/**
*
* @param entity entity class with getter/setter methods.
* @return
*/
@SuppressWarnings("rawtypes")
public Joiner appendEntries(final Object entity) {
if (entity == null) {
return this;
} else if (entity instanceof Map) {
return appendEntries((Map) entity);
}
N.checkArgument(N.isEntity(entity.getClass()), "'entity' must be entity class with getter/setter methods");
StringBuilder sb = null;
Object propValue = null;
for (String propName : ClassUtil.getPropGetMethodList(entity.getClass()).keySet()) {
propValue = ClassUtil.getPropValue(entity, propName);
if (propValue != null || skipNull == false) {
if (sb == null) {
sb = prepareBuilder().append(propName).append(keyValueDelimiter).append(toString(propValue));
} else {
if (isEmptyDelimiter) {
sb.append(propName);
} else {
sb.append(delimiter).append(propName);
}
if (isEmptyKeyValueDelimiter) {
sb.append(toString(propValue));
} else {
sb.append(keyValueDelimiter).append(toString(propValue));
}
}
}
}
return this;
}
public Joiner repeat(final String str, final int n) {
N.checkArgNotNegative(n, "n");
final String newString = toString(str);
if (n < 10) {
for (int i = 0; i < n; i++) {
append(newString);
}
} else {
append(StringUtil.repeat(newString, n, delimiter));
}
return this;
}
public Joiner repeat(final Object obj, final int n) {
return repeat(toString(obj), n);
}
/**
* Adds the contents of the given {@code StringJoiner} without prefix and
* suffix as the next element if it is non-empty. If the given {@code
* StringJoiner} is empty, the call has no effect.
*
* A {@code StringJoiner} is empty if {@link #addAll(CharSequence) add()}
* has never been called, and if {@code merge()} has never been called
* with a non-empty {@code StringJoiner} argument.
*
*
If the other {@code StringJoiner} is using a different delimiter,
* then elements from the other {@code StringJoiner} are concatenated with
* that delimiter and the result is appended to this {@code StringJoiner}
* as a single element.
*
* @param other The {@code StringJoiner} whose contents should be merged
* into this one
* @throws NullPointerException if the other {@code StringJoiner} is null
* @return This {@code StringJoiner}
*/
public Joiner merge(Joiner other) {
N.checkArgNotNull(other);
if (other.buffer != null) {
final int length = other.buffer.length();
// lock the length so that we can seize the data to be appended
// before initiate copying to avoid interference, especially when
// merge 'this'
StringBuilder builder = prepareBuilder();
builder.append(other.buffer, other.prefix.length(), length);
}
return this;
}
private StringBuilder prepareBuilder() {
if (buffer != null) {
if (isEmptyDelimiter == false) {
buffer.append(delimiter);
}
} else {
buffer = (useCachedBuffer ? Objectory.createStringBuilder() : new StringBuilder()).append(prefix);
}
return buffer;
}
private String toString(Object obj) {
return obj == null ? nullText : (trim ? N.toString(obj).trim() : N.toString(obj));
}
/**
* Returns the length of the {@code String} representation
* of this {@code StringJoiner}. Note that if
* no add methods have been called, then the length of the {@code String}
* representation (either {@code prefix + suffix} or {@code emptyValue})
* will be returned. The value should be equivalent to
* {@code toString().length()}.
*
* @return the length of the current value of {@code StringJoiner}
*/
public int length() {
// Remember that we never actually append the suffix unless we return
// the full (present) value or some sub-string or length of it, so that
// we can add on more if we need to.
return (buffer != null ? buffer.length() + suffix.length() : emptyValue.length());
}
/**
* Returns the current value, consisting of the {@code prefix}, the values
* added so far separated by the {@code delimiter}, and the {@code suffix},
* unless no elements have been added in which case, the
* {@code prefix + suffix} or the {@code emptyValue} characters are returned
*
*
* The underline {@code StringBuilder} will be recycled after this method is called if {@code resueStringBuilder} is set to {@code true},
* and should not continue to this instance.
*
*
* @return the string representation of this {@code StringJoiner}
*/
@Override
public String toString() {
if (buffer == null) {
return emptyValue;
} else {
try {
if (suffix.equals("")) {
return buffer.toString();
} else {
int initialLength = buffer.length();
String result = buffer.append(suffix).toString();
// reset value to pre-append initialLength
buffer.setLength(initialLength);
return result;
}
} finally {
if (useCachedBuffer) {
Objectory.recycle(buffer);
buffer = null;
}
}
}
}
/**
*
* The underline {@code StringBuilder} will be recycled after this method is called if {@code resueStringBuilder} is set to {@code true},
* and should not continue to this instance.
*
*
* @param mapper
* @return
*/
public T map(Try.Function mapper) throws E {
return mapper.apply(toString());
}
/**
*
* The underline {@code StringBuilder} will be recycled after this method is called if {@code resueStringBuilder} is set to {@code true},
* and should not continue to this instance.
*
*
* @param mapper
* @return
*/
public Nullable mapIfNotEmpty(Try.Function mapper) throws E {
N.checkArgNotNull(mapper);
return buffer == null ? Nullable. empty() : Nullable.of(mapper.apply(toString()));
}
/**
*
* The underline {@code StringBuilder} will be recycled after this method is called if {@code resueStringBuilder} is set to {@code true},
* and should not continue to this instance.
*
*
* @return
*/
public Stream stream() {
return Stream.of(toString());
}
/**
*
* The underline {@code StringBuilder} will be recycled after this method is called if {@code resueStringBuilder} is set to {@code true},
* and should not continue to this instance.
*
*
* @return
*/
public Stream streamIfNotEmpty() {
return buffer == null ? Stream. empty() : Stream.of(toString());
}
@Override
public void close() {
if (buffer != null && useCachedBuffer) {
Objectory.recycle(buffer);
buffer = null;
}
}
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