/*
* Copyright (C) 2014 The Android Open Source Project
* Copyright (c) 2003, 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 java.lang;
/*-[
#include "java/lang/Character.h"
]-*/
/**
* A mutable sequence of characters. This class provides an API compatible
* with {@code StringBuffer}, but with no guarantee of synchronization.
* This class is designed for use as a drop-in replacement for
* {@code StringBuffer} in places where the string buffer was being
* used by a single thread (as is generally the case). Where possible,
* it is recommended that this class be used in preference to
* {@code StringBuffer} as it will be faster under most implementations.
*
* <p>The principal operations on a {@code StringBuilder} are the
* {@code append} and {@code insert} methods, which are
* overloaded so as to accept data of any type. Each effectively
* converts a given datum to a string and then appends or inserts the
* characters of that string to the string builder. The
* {@code append} method always adds these characters at the end
* of the builder; the {@code insert} method adds the characters at
* a specified point.
* <p>
* For example, if {@code z} refers to a string builder object
* whose current contents are "{@code start}", then
* the method call {@code z.append("le")} would cause the string
* builder to contain "{@code startle}", whereas
* {@code z.insert(4, "le")} would alter the string builder to
* contain "{@code starlet}".
* <p>
* In general, if sb refers to an instance of a {@code StringBuilder},
* then {@code sb.append(x)} has the same effect as
* {@code sb.insert(sb.length(), x)}.
* <p>
* Every string builder has a capacity. As long as the length of the
* character sequence contained in the string builder does not exceed
* the capacity, it is not necessary to allocate a new internal
* buffer. If the internal buffer overflows, it is automatically made larger.
*
* <p>Instances of {@code StringBuilder} are not safe for
* use by multiple threads. If such synchronization is required then it is
* recommended that {@link java.lang.StringBuffer} be used.
*
* <p>Unless otherwise noted, passing a {@code null} argument to a constructor
* or method in this class will cause a {@link NullPointerException} to be
* thrown.
*
* @author Michael McCloskey
* @see java.lang.StringBuffer
* @see java.lang.String
* @since 1.5
*/
public final class StringBuilder
extends AbstractStringBuilder
implements java.io.Serializable, CharSequence
{
/** use serialVersionUID for interoperability */
static final long serialVersionUID = 4383685877147921099L;
/**
* Constructs a string builder with no characters in it and an
* initial capacity of 16 characters.
*/
public StringBuilder() {
}
/**
* Constructs a string builder with no characters in it and an
* initial capacity specified by the {@code capacity} argument.
*
* @param capacity the initial capacity.
* @throws NegativeArraySizeException if the {@code capacity}
* argument is less than {@code 0}.
*/
public StringBuilder(int capacity) {
super(capacity);
}
/**
* Constructs a string builder initialized to the contents of the
* specified string. The initial capacity of the string builder is
* {@code 16} plus the length of the string argument.
*
* @param str the initial contents of the buffer.
*/
public StringBuilder(String str) {
super(str.length() + 16);
append(str);
}
/**
* Constructs a string builder that contains the same characters
* as the specified {@code CharSequence}. The initial capacity of
* the string builder is {@code 16} plus the length of the
* {@code CharSequence} argument.
*
* @param seq the sequence to copy.
*/
public StringBuilder(CharSequence seq) {
this(seq.length() + 16);
append(seq);
}
public StringBuilder append(Object obj) {
return append(String.valueOf(obj));
}
public native StringBuilder append(String str) /*-[
JreStringBuilder_appendString(&self->delegate_, str);
return self;
]-*/;
/**
* Appends the specified {@code StringBuffer} to this sequence.
* <p>
* The characters of the {@code StringBuffer} argument are appended,
* in order, to this sequence, increasing the
* length of this sequence by the length of the argument.
* If {@code sb} is {@code null}, then the four characters
* {@code "null"} are appended to this sequence.
* <p>
* Let <i>n</i> be the length of this character sequence just prior to
* execution of the {@code append} method. Then the character at index
* <i>k</i> in the new character sequence is equal to the character at
* index <i>k</i> in the old character sequence, if <i>k</i> is less than
* <i>n</i>; otherwise, it is equal to the character at index <i>k-n</i>
* in the argument {@code sb}.
*
* @param sb the {@code StringBuffer} to append.
* @return a reference to this object.
*/
public native StringBuilder append(StringBuffer sb) /*-[
JreStringBuilder_appendStringBuffer(&self->delegate_, sb);
return self;
]-*/;
@Override
public native StringBuilder append(CharSequence s) /*-[
JreStringBuilder_appendCharSequence(&self->delegate_, s);
return self;
]-*/;
/**
* @throws IndexOutOfBoundsException {@inheritDoc}
*/
@Override
public native StringBuilder append(CharSequence s, int start, int end) /*-[
JreStringBuilder_appendCharSequenceSubset(&self->delegate_, s, start, end);
return self;
]-*/;
public native StringBuilder append(char[] str) /*-[
JreStringBuilder_appendCharArray(&self->delegate_, str);
return self;
]-*/;
/**
* @throws IndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder append(char[] str, int offset, int len) /*-[
JreStringBuilder_appendCharArraySubset(&self->delegate_, str, offset, len);
return self;
]-*/;
public StringBuilder append(boolean b) {
return append(Boolean.toString(b));
}
@Override
public native StringBuilder append(char c) /*-[
JreStringBuilder_appendChar(&self->delegate_, c);
return self;
]-*/;
public native StringBuilder append(int i) /*-[
JreStringBuilder_appendInt(&self->delegate_, i);
return self;
]-*/;
public native StringBuilder append(long lng) /*-[
JreStringBuilder_appendLong(&self->delegate_, lng);
return self;
]-*/;
public native StringBuilder append(float f) /*-[
JreStringBuilder_appendFloat(&self->delegate_, f);
return self;
]-*/;
public native StringBuilder append(double d) /*-[
JreStringBuilder_appendDouble(&self->delegate_, d);
return self;
]-*/;
/**
* @since 1.5
*/
public native StringBuilder appendCodePoint(int codePoint) /*-[
JreStringBuilder_appendCharArray(
&self->delegate_, JavaLangCharacter_toCharsWithInt_(codePoint));
return self;
]-*/;
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder delete(int start, int end) /*-[
JreStringBuilder_delete(&self->delegate_, start, end);
return self;
]-*/;
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder deleteCharAt(int index) /*-[
JreStringBuilder_deleteCharAt(&self->delegate_, index);
return self;
]-*/;
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder replace(int start, int end, String str) /*-[
JreStringBuilder_replace(&self->delegate_, start, end, str);
return self;
]-*/;
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder insert(int index, char[] str, int offset, int len) /*-[
JreStringBuilder_insertCharArraySubset(&self->delegate_, index, str, offset, len);
return self;
]-*/;
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public StringBuilder insert(int offset, Object obj) {
return insert(offset, String.valueOf(obj));
}
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder insert(int offset, String str) /*-[
JreStringBuilder_insertString(&self->delegate_, offset, str);
return self;
]-*/;
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder insert(int offset, char[] str) /*-[
JreStringBuilder_insertCharArray(&self->delegate_, offset, str);
return self;
]-*/;
/**
* @throws IndexOutOfBoundsException {@inheritDoc}
*/
public StringBuilder insert(int dstOffset, CharSequence s) {
return insert(dstOffset, String.valueOf(s));
}
/**
* @throws IndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder insert(int dstOffset, CharSequence s, int start, int end) /*-[
JreStringBuilder_insertCharSequence(&self->delegate_, dstOffset, s, start, end);
return self;
]-*/;
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public StringBuilder insert(int offset, boolean b) {
return insert(offset, Boolean.toString(b));
}
/**
* @throws IndexOutOfBoundsException {@inheritDoc}
*/
public native StringBuilder insert(int offset, char c) /*-[
JreStringBuilder_insertChar(&self->delegate_, offset, c);
return self;
]-*/;
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public StringBuilder insert(int offset, int i) {
return insert(offset, Integer.toString(i));
}
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public StringBuilder insert(int offset, long l) {
return insert(offset, Long.toString(l));
}
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public StringBuilder insert(int offset, float f) {
return insert(offset, Float.toString(f));
}
/**
* @throws StringIndexOutOfBoundsException {@inheritDoc}
*/
public StringBuilder insert(int offset, double d) {
return insert(offset, Double.toString(d));
}
public native StringBuilder reverse() /*-[
JreStringBuilder_reverse(&self->delegate_);
return self;
]-*/;
@Override
public native String toString() /*-[
return JreStringBuilder_toString(&self->delegate_);
]-*/;
/**
* Save the state of the {@code StringBuilder} instance to a stream
* (that is, serialize it).
*
* @serialData the number of characters currently stored in the string
* builder ({@code int}), followed by the characters in the
* string builder ({@code char[]}). The length of the
* {@code char} array may be greater than the number of
* characters currently stored in the string builder, in which
* case extra characters are ignored.
*/
private void writeObject(java.io.ObjectOutputStream s)
throws java.io.IOException {
s.defaultWriteObject();
s.writeInt(length());
s.writeObject(getValue());
}
/**
* readObject is called to restore the state of the StringBuffer from
* a stream.
*/
private void readObject(java.io.ObjectInputStream s)
throws java.io.IOException, ClassNotFoundException {
s.defaultReadObject();
int count = s.readInt();
char[] value = (char[]) s.readObject();
append(value, 0, count);
}
}