| /* |
| * Copyright 2008 Google Inc. |
| * |
| * 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 java.lang; |
| |
| import com.google.gwt.core.client.GWT; |
| import com.google.gwt.core.client.impl.StringBufferImpl; |
| |
| /** |
| * A fast way to create strings using multiple appends. This is implemented |
| * using a {@link StringBufferImpl} that is chosen with deferred binding. |
| * |
| * Most methods will give expected performance results. Exceptions are |
| * {@link #setCharAt(int, char)}, which is O(n), and {@link #length()}, which |
| * forces a {@link #toString()} and thus should not be used many times on the |
| * same <code>StringBuilder</code>. |
| * |
| * This class is an exact clone of {@link StringBuffer} except for the name. Any |
| * change made to one should be mirrored in the other. |
| */ |
| public class StringBuilder implements CharSequence, Appendable { |
| private final StringBufferImpl impl = GWT.create(StringBufferImpl.class); |
| private final Object data = impl.createData(); |
| |
| public StringBuilder() { |
| } |
| |
| public StringBuilder(CharSequence s) { |
| this(s.toString()); |
| } |
| |
| /** |
| * This implementation does not track capacity; using this constructor is |
| * functionally equivalent to using the zero-argument constructor. |
| */ |
| @SuppressWarnings("unused") |
| public StringBuilder(int ignoredCapacity) { |
| } |
| |
| public StringBuilder(String s) { |
| append(s); |
| } |
| |
| public StringBuilder append(boolean x) { |
| impl.append(data, x); |
| return this; |
| } |
| |
| public StringBuilder append(char x) { |
| impl.appendNonNull(data, String.valueOf(x)); |
| return this; |
| } |
| |
| public StringBuilder append(char[] x) { |
| impl.appendNonNull(data, String.valueOf(x)); |
| return this; |
| } |
| |
| public StringBuilder append(char[] x, int start, int len) { |
| impl.appendNonNull(data, String.valueOf(x, start, len)); |
| return this; |
| } |
| |
| public StringBuilder append(CharSequence x) { |
| impl.append(data, x); |
| return this; |
| } |
| |
| public StringBuilder append(CharSequence x, int start, int end) { |
| if (x == null) { |
| x = "null"; |
| } |
| impl.append(data, x.subSequence(start, end)); |
| return this; |
| } |
| |
| public StringBuilder append(double x) { |
| impl.append(data, x); |
| return this; |
| } |
| |
| public StringBuilder append(float x) { |
| impl.append(data, x); |
| return this; |
| } |
| |
| public StringBuilder append(int x) { |
| impl.append(data, x); |
| return this; |
| } |
| |
| public StringBuilder append(long x) { |
| impl.appendNonNull(data, String.valueOf(x)); |
| return this; |
| } |
| |
| public StringBuilder append(Object x) { |
| impl.append(data, x); |
| return this; |
| } |
| |
| public StringBuilder append(String x) { |
| impl.append(data, x); |
| return this; |
| } |
| |
| public StringBuilder append(StringBuilder x) { |
| impl.append(data, x); |
| return this; |
| } |
| |
| /** |
| * This implementation does not track capacity; always returns |
| * {@link Integer#MAX_VALUE}. |
| */ |
| public int capacity() { |
| return Integer.MAX_VALUE; |
| } |
| |
| public char charAt(int index) { |
| return toString().charAt(index); |
| } |
| |
| public StringBuilder delete(int start, int end) { |
| return replace(start, end, ""); |
| } |
| |
| public StringBuilder deleteCharAt(int start) { |
| return delete(start, start + 1); |
| } |
| |
| /** |
| * This implementation does not track capacity; calling this method has no |
| * effect. |
| */ |
| @SuppressWarnings("unused") |
| public void ensureCapacity(int ignoredCapacity) { |
| } |
| |
| public void getChars(int srcStart, int srcEnd, char[] dst, int dstStart) { |
| String.__checkBounds(length(), srcStart, srcEnd); |
| String.__checkBounds(dst.length, dstStart, dstStart + (srcEnd - srcStart)); |
| String s = toString(); |
| while (srcStart < srcEnd) { |
| dst[dstStart++] = s.charAt(srcStart++); |
| } |
| } |
| |
| public int indexOf(String x) { |
| return toString().indexOf(x); |
| } |
| |
| public int indexOf(String x, int start) { |
| return toString().indexOf(x, start); |
| } |
| |
| public StringBuilder insert(int index, boolean x) { |
| return insert(index, String.valueOf(x)); |
| } |
| |
| public StringBuilder insert(int index, char x) { |
| return insert(index, String.valueOf(x)); |
| } |
| |
| public StringBuilder insert(int index, char[] x) { |
| return insert(index, String.valueOf(x)); |
| } |
| |
| public StringBuilder insert(int index, char[] x, int offset, int len) { |
| return insert(index, String.valueOf(x, offset, len)); |
| } |
| |
| public StringBuilder insert(int index, CharSequence chars) { |
| return insert(index, chars.toString()); |
| } |
| |
| public StringBuilder insert(int index, CharSequence chars, int start, int end) { |
| return insert(index, chars.subSequence(start, end).toString()); |
| } |
| |
| public StringBuilder insert(int index, double x) { |
| return insert(index, String.valueOf(x)); |
| } |
| |
| public StringBuilder insert(int index, float x) { |
| return insert(index, String.valueOf(x)); |
| } |
| |
| public StringBuilder insert(int index, int x) { |
| return insert(index, String.valueOf(x)); |
| } |
| |
| public StringBuilder insert(int index, long x) { |
| return insert(index, String.valueOf(x)); |
| } |
| |
| public StringBuilder insert(int index, Object x) { |
| return insert(index, String.valueOf(x)); |
| } |
| |
| public StringBuilder insert(int index, String x) { |
| return replace(index, index, x); |
| } |
| |
| public int lastIndexOf(String s) { |
| return toString().lastIndexOf(s); |
| } |
| |
| public int lastIndexOf(String s, int start) { |
| return toString().lastIndexOf(s, start); |
| } |
| |
| public int length() { |
| return impl.length(data); |
| } |
| |
| public StringBuilder replace(int start, int end, String toInsert) { |
| impl.replace(data, start, end, toInsert); |
| return this; |
| } |
| |
| /** |
| * Warning! This method is <b>much</b> slower than the JRE implementation. If |
| * you need to do character level manipulation, you are strongly advised to |
| * use a char[] directly. |
| */ |
| public void setCharAt(int index, char x) { |
| replace(index, index + 1, String.valueOf(x)); |
| } |
| |
| public void setLength(int newLength) { |
| int oldLength = length(); |
| if (newLength < oldLength) { |
| delete(newLength, oldLength); |
| } else if (newLength > oldLength) { |
| append(new char[newLength - oldLength]); |
| } |
| } |
| |
| public CharSequence subSequence(int start, int end) { |
| return this.substring(start, end); |
| } |
| |
| public String substring(int begin) { |
| return toString().substring(begin); |
| } |
| |
| public String substring(int begin, int end) { |
| return toString().substring(begin, end); |
| } |
| |
| @Override |
| public String toString() { |
| return impl.toString(data); |
| } |
| |
| public void trimToSize() { |
| } |
| } |