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https://github.com/vanitasvitae/Smack.git
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26b5bc0212
by using XmlStringBuilder. Fixes SMACK-577 Also extend LazyStringBuilder with a cache. And extend XmlStringBuilder with some more convenience methods. Move the ELEMENT and NAMESPACE definition from Form to DataForm, where it belongs.
109 lines
2.7 KiB
Java
109 lines
2.7 KiB
Java
/**
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*
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* Copyright 2014 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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 org.jivesoftware.smack.util;
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import java.util.ArrayList;
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import java.util.List;
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public class LazyStringBuilder implements Appendable, CharSequence {
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private final List<CharSequence> list;
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private String cache;
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private void invalidateCache() {
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cache = null;
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}
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public LazyStringBuilder() {
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list = new ArrayList<CharSequence>(20);
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}
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public LazyStringBuilder append(LazyStringBuilder lsb) {
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list.addAll(lsb.list);
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invalidateCache();
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return this;
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}
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@Override
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public LazyStringBuilder append(CharSequence csq) {
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assert csq != null;
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list.add(csq);
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invalidateCache();
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return this;
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}
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@Override
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public LazyStringBuilder append(CharSequence csq, int start, int end) {
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CharSequence subsequence = csq.subSequence(start, end);
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list.add(subsequence);
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invalidateCache();
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return this;
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}
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@Override
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public LazyStringBuilder append(char c) {
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list.add(Character.toString(c));
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invalidateCache();
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return this;
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}
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@Override
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public int length() {
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if (cache != null) {
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return cache.length();
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}
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int length = 0;
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for (CharSequence csq : list) {
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length += csq.length();
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}
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return length;
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}
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@Override
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public char charAt(int index) {
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if (cache != null) {
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return cache.charAt(index);
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}
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for (CharSequence csq : list) {
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if (index < csq.length()) {
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return csq.charAt(index);
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} else {
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index -= csq.length();
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}
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}
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throw new IndexOutOfBoundsException();
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}
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@Override
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public CharSequence subSequence(int start, int end) {
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return toString().subSequence(start, end);
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}
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@Override
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public String toString() {
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if (cache == null) {
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StringBuilder sb = new StringBuilder(length());
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for (CharSequence csq : list) {
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sb.append(csq);
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}
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cache = sb.toString();
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}
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return cache;
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}
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}
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