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206
java/org/apache/jasper/xmlparser/ASCIIReader.java Normal file
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.jasper.xmlparser;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import org.apache.jasper.compiler.Localizer;
/**
* A simple ASCII byte reader. This is an optimized reader for reading
* byte streams that only contain 7-bit ASCII characters.
*
* @author Andy Clark, IBM
*
* @deprecated Will be removed in Tomcat 9.0.x onwards
*/
@Deprecated
public class ASCIIReader extends Reader {
//
// Data
//
/** Input stream. */
private final InputStream fInputStream;
/** Byte buffer. */
private final byte[] fBuffer;
//
// Constructors
//
/**
* Constructs an ASCII reader from the specified input stream
* and buffer size.
*
* @param inputStream The input stream.
* @param size The initial buffer size.
*/
public ASCIIReader(InputStream inputStream, int size) {
fInputStream = inputStream;
fBuffer = new byte[size];
}
//
// Reader methods
//
/**
* Read a single character. This method will block until a character is
* available, an I/O error occurs, or the end of the stream is reached.
*
* <p> Subclasses that intend to support efficient single-character input
* should override this method.
*
* @return The character read, as an integer in the range 0 to 127
* (<code>0x00-0x7f</code>), or -1 if the end of the stream has
* been reached
*
* @exception IOException If an I/O error occurs
*/
@Override
public int read() throws IOException {
int b0 = fInputStream.read();
if (b0 > 0x80) {
throw new IOException(Localizer.getMessage("jsp.error.xml.invalidASCII",
Integer.toString(b0)));
}
return b0;
} // read():int
/**
* Read characters into a portion of an array. This method will block
* until some input is available, an I/O error occurs, or the end of the
* stream is reached.
*
* @param ch Destination buffer
* @param offset Offset at which to start storing characters
* @param length Maximum number of characters to read
*
* @return The number of characters read, or -1 if the end of the
* stream has been reached
*
* @exception IOException If an I/O error occurs
*/
@Override
public int read(char ch[], int offset, int length) throws IOException {
if (length > fBuffer.length) {
length = fBuffer.length;
}
int count = fInputStream.read(fBuffer, 0, length);
for (int i = 0; i < count; i++) {
int b0 = (0xff & fBuffer[i]); // Convert to unsigned
if (b0 > 0x80) {
throw new IOException(Localizer.getMessage("jsp.error.xml.invalidASCII",
Integer.toString(b0)));
}
ch[offset + i] = (char)b0;
}
return count;
} // read(char[],int,int)
/**
* Skip characters. This method will block until some characters are
* available, an I/O error occurs, or the end of the stream is reached.
*
* @param n The number of characters to skip
*
* @return The number of characters actually skipped
*
* @exception IOException If an I/O error occurs
*/
@Override
public long skip(long n) throws IOException {
return fInputStream.skip(n);
} // skip(long):long
/**
* Tell whether this stream is ready to be read.
*
* @return True if the next read() is guaranteed not to block for input,
* false otherwise. Note that returning false does not guarantee that the
* next read will block.
*
* @exception IOException If an I/O error occurs
*/
@Override
public boolean ready() throws IOException {
return false;
} // ready()
/**
* Tell whether this stream supports the mark() operation.
*/
@Override
public boolean markSupported() {
return fInputStream.markSupported();
} // markSupported()
/**
* Mark the present position in the stream. Subsequent calls to reset()
* will attempt to reposition the stream to this point. Not all
* character-input streams support the mark() operation.
*
* @param readAheadLimit Limit on the number of characters that may be
* read while still preserving the mark. After
* reading this many characters, attempting to
* reset the stream may fail.
*
* @exception IOException If the stream does not support mark(),
* or if some other I/O error occurs
*/
@Override
public void mark(int readAheadLimit) throws IOException {
fInputStream.mark(readAheadLimit);
} // mark(int)
/**
* Reset the stream. If the stream has been marked, then attempt to
* reposition it at the mark. If the stream has not been marked, then
* attempt to reset it in some way appropriate to the particular stream,
* for example by repositioning it to its starting point. Not all
* character-input streams support the reset() operation, and some support
* reset() without supporting mark().
*
* @exception IOException If the stream has not been marked,
* or if the mark has been invalidated,
* or if the stream does not support reset(),
* or if some other I/O error occurs
*/
@Override
public void reset() throws IOException {
fInputStream.reset();
} // reset()
/**
* Close the stream. Once a stream has been closed, further read(),
* ready(), mark(), or reset() invocations will throw an IOException.
* Closing a previously-closed stream, however, has no effect.
*
* @exception IOException If an I/O error occurs
*/
@Override
public void close() throws IOException {
fInputStream.close();
} // close()
} // class ASCIIReader

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java/org/apache/jasper/xmlparser/EncodingMap.java Normal file
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.jasper.xmlparser;
/**
* This class is a symbol table implementation that guarantees that
* strings used as identifiers are unique references. Multiple calls
* to <code>addSymbol</code> will always return the same string
* reference.
* <p>
* The symbol table performs the same task as <code>String.intern()</code>
* with the following differences:
* <ul>
* <li>
* A new string object does not need to be created in order to
* retrieve a unique reference. Symbols can be added by using
* a series of characters in a character array.
* </li>
* <li>
* Users of the symbol table can provide their own symbol hashing
* implementation. For example, a simple string hashing algorithm
* may fail to produce a balanced set of hashcodes for symbols
* that are <em>mostly</em> unique. Strings with similar leading
* characters are especially prone to this poor hashing behavior.
* </li>
* </ul>
*
* @author Andy Clark
*
* @deprecated Will be removed in Tomcat 9.0.x onwards
*/
@Deprecated
public class SymbolTable {
//
// Constants
//
/**
* Default table size.
*/
private static final int TABLE_SIZE = 101;
//
// Data
//
/**
* Buckets.
*/
private final Entry[] fBuckets;
// actual table size
private final int fTableSize;
//
// Constructors
//
/**
* Constructs a symbol table with a default number of buckets.
*/
public SymbolTable() {
this(TABLE_SIZE);
}
/**
* Constructs a symbol table with a specified number of buckets.
* @param tableSize The table size (default is 101)
*/
public SymbolTable(int tableSize) {
fTableSize = tableSize;
fBuckets = new Entry[fTableSize];
}
//
// Public methods
//
/**
* Adds the specified symbol to the symbol table and returns a
* reference to the unique symbol. If the symbol already exists,
* the previous symbol reference is returned instead, in order
* guarantee that symbol references remain unique.
*
* @param buffer The buffer containing the new symbol.
* @param offset The offset into the buffer of the new symbol.
* @param length The length of the new symbol in the buffer.
* @return the symbol added
*/
public String addSymbol(char[] buffer, int offset, int length) {
// search for identical symbol
int bucket = hash(buffer, offset, length) % fTableSize;
OUTER: for (Entry entry = fBuckets[bucket]; entry != null; entry = entry.next) {
if (length == entry.characters.length) {
for (int i = 0; i < length; i++) {
if (buffer[offset + i] != entry.characters[i]) {
continue OUTER;
}
}
return entry.symbol;
}
}
// add new entry
Entry entry = new Entry(buffer, offset, length, fBuckets[bucket]);
fBuckets[bucket] = entry;
return entry.symbol;
} // addSymbol(char[],int,int):String
/**
* Returns a hashcode value for the specified symbol information.
* The value returned by this method must be identical to the value
* returned by the <code>hash(String)</code> method when called
* with the string object created from the symbol information.
*
* @param buffer The character buffer containing the symbol.
* @param offset The offset into the character buffer of the start
* of the symbol.
* @param length The length of the symbol.
* @return the hash value
*/
public int hash(char[] buffer, int offset, int length) {
int code = 0;
for (int i = 0; i < length; i++) {
code = code * 37 + buffer[offset + i];
}
return code & 0x7FFFFFF;
} // hash(char[],int,int):int
//
// Classes
//
/**
* This class is a symbol table entry. Each entry acts as a node
* in a linked list.
*/
private static final class Entry {
/**
* Symbol.
*/
private final String symbol;
/**
* Symbol characters. This information is duplicated here for
* comparison performance.
*/
private final char[] characters;
/**
* The next entry.
*/
private final Entry next;
/*
* Constructs a new entry from the specified symbol information and
* next entry reference.
*/
public Entry(char[] ch, int offset, int length, Entry next) {
characters = new char[length];
System.arraycopy(ch, offset, characters, 0, length);
symbol = new String(characters).intern();
this.next = next;
}
}
}

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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.jasper.xmlparser;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* Reader for UCS-2 and UCS-4 encodings.
* (i.e., encodings from ISO-10646-UCS-(2|4)).
*
* @author Neil Graham, IBM
*
* @deprecated Will be removed in Tomcat 9.0.x onwards
*/
@Deprecated
public class UCSReader extends Reader {
private final Log log = LogFactory.getLog(UCSReader.class); // must not be static
//
// Constants
//
/** Default byte buffer size (8192, larger than that of ASCIIReader
* since it's reasonable to surmise that the average UCS-4-encoded
* file should be 4 times as large as the average ASCII-encoded file).
*/
private static final int DEFAULT_BUFFER_SIZE = 8192;
public static final short UCS2LE = 1;
public static final short UCS2BE = 2;
public static final short UCS4LE = 4;
public static final short UCS4BE = 8;
//
// Data
//
/** Input stream. */
private final InputStream fInputStream;
/** Byte buffer. */
private final byte[] fBuffer;
// what kind of data we're dealing with
private final short fEncoding;
//
// Constructors
//
/**
* Constructs an ASCII reader from the specified input stream
* using the default buffer size. The Endian-ness and whether this is
* UCS-2 or UCS-4 needs also to be known in advance.
*
* @param inputStream The input stream.
* @param encoding One of UCS2LE, UCS2BE, UCS4LE or UCS4BE.
*/
public UCSReader(InputStream inputStream, short encoding) {
this(inputStream, DEFAULT_BUFFER_SIZE, encoding);
} // <init>(InputStream, short)
/**
* Constructs an ASCII reader from the specified input stream
* and buffer size. The Endian-ness and whether this is
* UCS-2 or UCS-4 needs also to be known in advance.
*
* @param inputStream The input stream.
* @param size The initial buffer size.
* @param encoding One of UCS2LE, UCS2BE, UCS4LE or UCS4BE.
*/
public UCSReader(InputStream inputStream, int size, short encoding) {
fInputStream = inputStream;
fBuffer = new byte[size];
fEncoding = encoding;
} // <init>(InputStream,int,short)
//
// Reader methods
//
/**
* Read a single character. This method will block until a character is
* available, an I/O error occurs, or the end of the stream is reached.
*
* <p> Subclasses that intend to support efficient single-character input
* should override this method.
*
* @return The character read, as an integer in the range 0 to 127
* (<code>0x00-0x7f</code>), or -1 if the end of the stream has
* been reached
*
* @exception IOException If an I/O error occurs
*/
@Override
public int read() throws IOException {
int b0 = fInputStream.read() & 0xff;
if (b0 == 0xff)
return -1;
int b1 = fInputStream.read() & 0xff;
if (b1 == 0xff)
return -1;
if(fEncoding >=4) {
int b2 = fInputStream.read() & 0xff;
if (b2 == 0xff)
return -1;
int b3 = fInputStream.read() & 0xff;
if (b3 == 0xff)
return -1;
if (log.isDebugEnabled())
log.debug("b0 is " + (b0 & 0xff) + " b1 " + (b1 & 0xff) + " b2 " + (b2 & 0xff) + " b3 " + (b3 & 0xff));
if (fEncoding == UCS4BE)
return (b0<<24)+(b1<<16)+(b2<<8)+b3;
else
return (b3<<24)+(b2<<16)+(b1<<8)+b0;
} else { // UCS-2
if (fEncoding == UCS2BE)
return (b0<<8)+b1;
else
return (b1<<8)+b0;
}
} // read():int
/**
* Read characters into a portion of an array. This method will block
* until some input is available, an I/O error occurs, or the end of the
* stream is reached.
*
* @param ch Destination buffer
* @param offset Offset at which to start storing characters
* @param length Maximum number of characters to read
*
* @return The number of characters read, or -1 if the end of the
* stream has been reached
*
* @exception IOException If an I/O error occurs
*/
@Override
public int read(char ch[], int offset, int length) throws IOException {
int byteLength = length << ((fEncoding >= 4)?2:1);
if (byteLength > fBuffer.length) {
byteLength = fBuffer.length;
}
int count = fInputStream.read(fBuffer, 0, byteLength);
if(count == -1) return -1;
// try and make count be a multiple of the number of bytes we're looking for
if(fEncoding >= 4) { // BigEndian
// this looks ugly, but it avoids an if at any rate...
int numToRead = (4 - (count & 3) & 3);
for(int i=0; i<numToRead; i++) {
int charRead = fInputStream.read();
if(charRead == -1) { // end of input; something likely went wrong!A Pad buffer with nulls.
for (int j = i;j<numToRead; j++)
fBuffer[count+j] = 0;
break;
} else {
fBuffer[count+i] = (byte)charRead;
}
}
count += numToRead;
} else {
int numToRead = count & 1;
if(numToRead != 0) {
count++;
int charRead = fInputStream.read();
if(charRead == -1) { // end of input; something likely went wrong!A Pad buffer with nulls.
fBuffer[count] = 0;
} else {
fBuffer[count] = (byte)charRead;
}
}
}
// now count is a multiple of the right number of bytes
int numChars = count >> ((fEncoding >= 4)?2:1);
int curPos = 0;
for (int i = 0; i < numChars; i++) {
int b0 = fBuffer[curPos++] & 0xff;
int b1 = fBuffer[curPos++] & 0xff;
if(fEncoding >=4) {
int b2 = fBuffer[curPos++] & 0xff;
int b3 = fBuffer[curPos++] & 0xff;
if (fEncoding == UCS4BE)
ch[offset+i] = (char)((b0<<24)+(b1<<16)+(b2<<8)+b3);
else
ch[offset+i] = (char)((b3<<24)+(b2<<16)+(b1<<8)+b0);
} else { // UCS-2
if (fEncoding == UCS2BE)
ch[offset+i] = (char)((b0<<8)+b1);
else
ch[offset+i] = (char)((b1<<8)+b0);
}
}
return numChars;
} // read(char[],int,int)
/**
* Skip characters. This method will block until some characters are
* available, an I/O error occurs, or the end of the stream is reached.
*
* @param n The number of characters to skip
*
* @return The number of characters actually skipped
*
* @exception IOException If an I/O error occurs
*/
@Override
public long skip(long n) throws IOException {
// charWidth will represent the number of bits to move
// n leftward to get num of bytes to skip, and then move the result rightward
// to get num of chars effectively skipped.
// The trick with &'ing, as with elsewhere in this dcode, is
// intended to avoid an expensive use of / that might not be optimized
// away.
int charWidth = (fEncoding >=4)?2:1;
long bytesSkipped = fInputStream.skip(n<<charWidth);
if((bytesSkipped & (charWidth | 1)) == 0) return bytesSkipped >> charWidth;
return (bytesSkipped >> charWidth) + 1;
} // skip(long):long
/**
* Tell whether this stream is ready to be read.
*
* @return True if the next read() is guaranteed not to block for input,
* false otherwise. Note that returning false does not guarantee that the
* next read will block.
*
* @exception IOException If an I/O error occurs
*/
@Override
public boolean ready() throws IOException {
return false;
} // ready()
/**
* Tell whether this stream supports the mark() operation.
*/
@Override
public boolean markSupported() {
return fInputStream.markSupported();
} // markSupported()
/**
* Mark the present position in the stream. Subsequent calls to reset()
* will attempt to reposition the stream to this point. Not all
* character-input streams support the mark() operation.
*
* @param readAheadLimit Limit on the number of characters that may be
* read while still preserving the mark. After
* reading this many characters, attempting to
* reset the stream may fail.
*
* @exception IOException If the stream does not support mark(),
* or if some other I/O error occurs
*/
@Override
public void mark(int readAheadLimit) throws IOException {
fInputStream.mark(readAheadLimit);
} // mark(int)
/**
* Reset the stream. If the stream has been marked, then attempt to
* reposition it at the mark. If the stream has not been marked, then
* attempt to reset it in some way appropriate to the particular stream,
* for example by repositioning it to its starting point. Not all
* character-input streams support the reset() operation, and some support
* reset() without supporting mark().
*
* @exception IOException If the stream has not been marked,
* or if the mark has been invalidated,
* or if the stream does not support reset(),
* or if some other I/O error occurs
*/
@Override
public void reset() throws IOException {
fInputStream.reset();
} // reset()
/**
* Close the stream. Once a stream has been closed, further read(),
* ready(), mark(), or reset() invocations will throw an IOException.
* Closing a previously-closed stream, however, has no effect.
*
* @exception IOException If an I/O error occurs
*/
@Override
public void close() throws IOException {
fInputStream.close();
} // close()
} // class UCSReader

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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.jasper.xmlparser;
/**
* This class is used as a structure to pass text contained in the underlying
* character buffer of the scanner. The offset and length fields allow the
* buffer to be re-used without creating new character arrays.
* <p>
* <strong>Note:</strong> Methods that are passed an XMLString structure
* should consider the contents read-only and not make any modifications
* to the contents of the buffer. The method receiving this structure
* should also not modify the offset and length if this structure (or
* the values of this structure) are passed to another method.
* <p>
* <strong>Note:</strong> Methods that are passed an XMLString structure
* are required to copy the information out of the buffer if it is to be
* saved for use beyond the scope of the method. The contents of the
* structure are volatile and the contents of the character buffer cannot
* be assured once the method that is passed this structure returns.
* Therefore, methods passed this structure should not save any reference
* to the structure or the character array contained in the structure.
*
* @author Eric Ye, IBM
* @author Andy Clark, IBM
*
* @deprecated Will be removed in Tomcat 9.0.x onwards
*/
@Deprecated
public class XMLString {
//
// Data
//
/**
* The character array.
*/
public char[] ch;
/**
* The offset into the character array.
*/
public int offset;
/**
* The length of characters from the offset.
*/
public int length;
//
// Constructors
//
/**
* Default constructor.
*/
public XMLString() {
} // <init>()
//
// Public methods
//
/**
* Initializes the contents of the XMLString structure with the
* specified values.
*
* @param ch The character array.
* @param offset The offset into the character array.
* @param length The length of characters from the offset.
*/
public void setValues(char[] ch, int offset, int length) {
this.ch = ch;
this.offset = offset;
this.length = length;
} // setValues(char[],int,int)
/**
* Initializes the contents of the XMLString structure with copies
* of the given string structure.
* <p>
* <strong>Note:</strong> This does not copy the character array;
* only the reference to the array is copied.
*
* @param s The string
*/
public void setValues(XMLString s) {
setValues(s.ch, s.offset, s.length);
} // setValues(XMLString)
/**
* Resets all of the values to their defaults.
*/
public void clear() {
this.ch = null;
this.offset = 0;
this.length = -1;
} // clear()
/**
* Returns true if the contents of this XMLString structure and
* the specified string are equal.
*
* @param s The string to compare.
* @return <code>true</code> if equal
*/
public boolean equals(String s) {
if (s == null) {
return false;
}
if ( length != s.length() ) {
return false;
}
// is this faster than call s.toCharArray first and compare the
// two arrays directly, which will possibly involve creating a
// new char array object.
for (int i=0; i<length; i++) {
if (ch[offset+i] != s.charAt(i)) {
return false;
}
}
return true;
} // equals(String):boolean
//
// Object methods
//
@Override
public String toString() {
return length > 0 ? new String(ch, offset, length) : "";
} // toString():String
} // class XMLString

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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.jasper.xmlparser;
/**
* XMLString is a structure used to pass character arrays. However,
* XMLStringBuffer is a buffer in which characters can be appended
* and extends XMLString so that it can be passed to methods
* expecting an XMLString object. This is a safe operation because
* it is assumed that any callee will <strong>not</strong> modify
* the contents of the XMLString structure.
* <p>
* The contents of the string are managed by the string buffer. As
* characters are appended, the string buffer will grow as needed.
* <p>
* <strong>Note:</strong> Never set the <code>ch</code>,
* <code>offset</code>, and <code>length</code> fields directly.
* These fields are managed by the string buffer. In order to reset
* the buffer, call <code>clear()</code>.
*
* @author Andy Clark, IBM
* @author Eric Ye, IBM
*
* @deprecated Will be removed in Tomcat 9.0.x onwards
*/
@Deprecated
public class XMLStringBuffer
extends XMLString {
//
// Constants
//
/**
* Default buffer size (32).
*/
private static final int DEFAULT_SIZE = 32;
//
// Constructors
//
/**
* Build a string buffer with the default size (32).
*/
public XMLStringBuffer() {
this(DEFAULT_SIZE);
} // <init>()
/**
* Build a string buffer with the specified size.
* @param size The backing array size
*/
public XMLStringBuffer(int size) {
ch = new char[size];
} // <init>(int)
//
// Public methods
//
/**
* Clears the string buffer.
*/
@Override
public void clear() {
offset = 0;
length = 0;
}
/**
* Append character.
*
* @param c The character to append
*/
public void append(char c) {
if (this.length + 1 > this.ch.length) {
int newLength = this.ch.length*2;
if (newLength < this.ch.length + DEFAULT_SIZE)
newLength = this.ch.length + DEFAULT_SIZE;
char[] newch = new char[newLength];
System.arraycopy(this.ch, 0, newch, 0, this.length);
this.ch = newch;
}
this.ch[this.length] = c;
this.length++;
} // append(char)
/**
* Append string.
*
* @param s The string to append
*/
public void append(String s) {
int length = s.length();
if (this.length + length > this.ch.length) {
int newLength = this.ch.length*2;
if (newLength < this.length + length + DEFAULT_SIZE)
newLength = this.ch.length + length + DEFAULT_SIZE;
char[] newch = new char[newLength];
System.arraycopy(this.ch, 0, newch, 0, this.length);
this.ch = newch;
}
s.getChars(0, length, this.ch, this.length);
this.length += length;
} // append(String)
/**
* Append characters.
*
* @param ch The character array
* @param offset The offset
* @param length The length
*/
public void append(char[] ch, int offset, int length) {
if (this.length + length > this.ch.length) {
char[] newch = new char[this.ch.length + length + DEFAULT_SIZE];
System.arraycopy(this.ch, 0, newch, 0, this.length);
this.ch = newch;
}
System.arraycopy(ch, offset, this.ch, this.length, length);
this.length += length;
} // append(char[],int,int)
/**
* Append XML string
*
* @param s The string
*/
public void append(XMLString s) {
append(s.ch, s.offset, s.length);
} // append(XMLString)
} // class XMLStringBuffer