mirror of https://github.com/longtai-cn/hippo4j
Lijx
3 years ago
parent
1e775632ad
commit
cd9259014a
@ -0,0 +1,90 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cn.hippo4j.common.toolkit;
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import java.io.IOException;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.Objects;
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/**
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* reference google guava
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*
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*/
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public class Joiner {
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private final String separator;
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private Joiner(String separator) {
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this.separator = Objects.requireNonNull(separator);
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}
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/** Returns a joiner which automatically places {@code separator} between consecutive elements. */
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public static Joiner on(String separator) {
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return new Joiner(separator);
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}
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/**
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* Returns a string containing the string representation of each of {@code parts}, using the
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* previously configured separator between each.
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*
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*/
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public final String join(Object[] parts) {
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return join(Arrays.asList(parts));
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}
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public final String join(Iterable<?> parts) {
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return join(parts.iterator());
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}
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/**
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* Returns a string containing the string representation of each of {@code parts}, using the
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* previously configured separator between each.
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*
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*/
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public final String join(Iterator<?> parts) {
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return appendTo(new StringBuilder(), parts).toString();
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}
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public final StringBuilder appendTo(StringBuilder builder, Iterator<?> parts) {
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try {
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appendTo((Appendable) builder, parts);
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} catch (IOException impossible) {
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throw new AssertionError(impossible);
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}
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return builder;
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}
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public <A extends Appendable> A appendTo(A appendable, Iterator<?> parts) throws IOException {
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Objects.requireNonNull(appendable);
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if (parts.hasNext()) {
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appendable.append(toString(parts.next()));
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while (parts.hasNext()) {
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appendable.append(separator);
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appendable.append(toString(parts.next()));
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}
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}
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return appendable;
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}
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CharSequence toString(Object part) {
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Objects.requireNonNull(part);
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return (part instanceof CharSequence) ? (CharSequence) part : part.toString();
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}
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}
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