| /* |
| * |
| * 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.qpid.framing; |
| |
| import org.apache.mina.common.ByteBuffer; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.*; |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * A short string is a representation of an AMQ Short String |
| * Short strings differ from the Java String class by being limited to on ASCII characters (0-127) |
| * and thus can be held more effectively in a byte buffer. |
| * |
| */ |
| public final class AMQShortString implements CharSequence, Comparable<AMQShortString> |
| { |
| private static final byte MINUS = (byte)'-'; |
| private static final byte ZERO = (byte) '0'; |
| |
| |
| |
| private final class TokenizerImpl implements AMQShortStringTokenizer |
| { |
| private final byte _delim; |
| private int _count = -1; |
| private int _pos = 0; |
| |
| public TokenizerImpl(final byte delim) |
| { |
| _delim = delim; |
| } |
| |
| public int countTokens() |
| { |
| if(_count == -1) |
| { |
| _count = 1 + AMQShortString.this.occurences(_delim); |
| } |
| return _count; |
| } |
| |
| public AMQShortString nextToken() |
| { |
| if(_pos <= AMQShortString.this.length()) |
| { |
| int nextDelim = AMQShortString.this.indexOf(_delim, _pos); |
| if(nextDelim == -1) |
| { |
| nextDelim = AMQShortString.this.length(); |
| } |
| |
| AMQShortString nextToken = AMQShortString.this.substring(_pos, nextDelim++); |
| _pos = nextDelim; |
| return nextToken; |
| } |
| else |
| { |
| return null; |
| } |
| } |
| |
| public boolean hasMoreTokens() |
| { |
| return _pos <= AMQShortString.this.length(); |
| } |
| } |
| |
| private AMQShortString substring(final int from, final int to) |
| { |
| return new AMQShortString(_data, from+_offset, to+_offset); |
| } |
| |
| |
| private static final ThreadLocal<Map<AMQShortString, WeakReference<AMQShortString>>> _localInternMap = |
| new ThreadLocal<Map<AMQShortString, WeakReference<AMQShortString>>>() |
| { |
| protected Map<AMQShortString, WeakReference<AMQShortString>> initialValue() |
| { |
| return new WeakHashMap<AMQShortString, WeakReference<AMQShortString>>(); |
| }; |
| }; |
| |
| private static final Map<AMQShortString, WeakReference<AMQShortString>> _globalInternMap = |
| new WeakHashMap<AMQShortString, WeakReference<AMQShortString>>(); |
| |
| private static final Logger _logger = LoggerFactory.getLogger(AMQShortString.class); |
| |
| private final byte[] _data; |
| private final int _offset; |
| private int _hashCode; |
| private String _asString = null; |
| |
| private final int _length; |
| private static final char[] EMPTY_CHAR_ARRAY = new char[0]; |
| |
| public static final AMQShortString EMPTY_STRING = new AMQShortString((String)null); |
| |
| public AMQShortString(byte[] data) |
| { |
| |
| _data = data.clone(); |
| _length = data.length; |
| _offset = 0; |
| } |
| |
| public AMQShortString(byte[] data, int pos) |
| { |
| final int size = data[pos++]; |
| final byte[] dataCopy = new byte[size]; |
| System.arraycopy(data,pos,dataCopy,0,size); |
| _length = size; |
| _data = dataCopy; |
| _offset = 0; |
| } |
| |
| public AMQShortString(String data) |
| { |
| this((data == null) ? EMPTY_CHAR_ARRAY : data.toCharArray()); |
| _asString = data; |
| } |
| |
| public AMQShortString(char[] data) |
| { |
| if (data == null) |
| { |
| throw new NullPointerException("Cannot create AMQShortString with null char[]"); |
| } |
| |
| final int length = data.length; |
| final byte[] stringBytes = new byte[length]; |
| int hash = 0; |
| for (int i = 0; i < length; i++) |
| { |
| stringBytes[i] = (byte) (0xFF & data[i]); |
| hash = (31 * hash) + stringBytes[i]; |
| } |
| _hashCode = hash; |
| _data = stringBytes; |
| |
| _length = length; |
| _offset = 0; |
| |
| } |
| |
| public AMQShortString(CharSequence charSequence) |
| { |
| final int length = charSequence.length(); |
| final byte[] stringBytes = new byte[length]; |
| int hash = 0; |
| for (int i = 0; i < length; i++) |
| { |
| stringBytes[i] = ((byte) (0xFF & charSequence.charAt(i))); |
| hash = (31 * hash) + stringBytes[i]; |
| |
| } |
| |
| _data = stringBytes; |
| _hashCode = hash; |
| _length = length; |
| _offset = 0; |
| |
| } |
| |
| private AMQShortString(ByteBuffer data, final int length) |
| { |
| if(data.isDirect() || data.isReadOnly()) |
| { |
| byte[] dataBytes = new byte[length]; |
| data.get(dataBytes); |
| _data = dataBytes; |
| _offset = 0; |
| } |
| else |
| { |
| |
| _data = data.array(); |
| _offset = data.arrayOffset() + data.position(); |
| data.skip(length); |
| |
| } |
| _length = length; |
| |
| } |
| |
| private AMQShortString(final byte[] data, final int from, final int to) |
| { |
| _offset = from; |
| _length = to - from; |
| _data = data; |
| } |
| |
| public AMQShortString shrink() |
| { |
| if(_data.length != _length) |
| { |
| byte[] dataBytes = new byte[_length]; |
| System.arraycopy(_data,_offset,dataBytes,0,_length); |
| return new AMQShortString(dataBytes,0,_length); |
| } |
| else |
| { |
| return this; |
| } |
| } |
| |
| /** |
| * Get the length of the short string |
| * @return length of the underlying byte array |
| */ |
| public int length() |
| { |
| return _length; |
| } |
| |
| public char charAt(int index) |
| { |
| |
| return (char) _data[_offset + index]; |
| |
| } |
| |
| public CharSequence subSequence(int start, int end) |
| { |
| return new CharSubSequence(start, end); |
| } |
| |
| public int writeToByteArray(byte[] encoding, int pos) |
| { |
| final int size = length(); |
| encoding[pos++] = (byte) size; |
| System.arraycopy(_data,_offset,encoding,pos,size); |
| return pos+size; |
| } |
| |
| public static AMQShortString readFromByteArray(byte[] byteEncodedDestination, int pos) |
| { |
| |
| |
| final AMQShortString shortString = new AMQShortString(byteEncodedDestination, pos); |
| if(shortString.length() == 0) |
| { |
| return null; |
| } |
| else |
| { |
| return shortString; |
| } |
| } |
| |
| public static AMQShortString readFromBuffer(ByteBuffer buffer) |
| { |
| final short length = buffer.getUnsigned(); |
| if (length == 0) |
| { |
| return null; |
| } |
| else |
| { |
| |
| return new AMQShortString(buffer, length); |
| } |
| } |
| |
| public byte[] getBytes() |
| { |
| if(_offset == 0 && _length == _data.length) |
| { |
| return _data.clone(); |
| } |
| else |
| { |
| byte[] data = new byte[_length]; |
| System.arraycopy(_data,_offset,data,0,_length); |
| return data; |
| } |
| } |
| |
| public void writeToBuffer(ByteBuffer buffer) |
| { |
| |
| final int size = length(); |
| //buffer.setAutoExpand(true); |
| buffer.put((byte) size); |
| buffer.put(_data, _offset, size); |
| |
| } |
| |
| public boolean endsWith(String s) |
| { |
| return endsWith(new AMQShortString(s)); |
| } |
| |
| |
| public boolean endsWith(AMQShortString otherString) |
| { |
| |
| if (otherString.length() > length()) |
| { |
| return false; |
| } |
| |
| |
| int thisLength = length(); |
| int otherLength = otherString.length(); |
| |
| for (int i = 1; i <= otherLength; i++) |
| { |
| if (charAt(thisLength - i) != otherString.charAt(otherLength - i)) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| public boolean startsWith(String s) |
| { |
| return startsWith(new AMQShortString(s)); |
| } |
| |
| public boolean startsWith(AMQShortString otherString) |
| { |
| |
| if (otherString.length() > length()) |
| { |
| return false; |
| } |
| |
| for (int i = 0; i < otherString.length(); i++) |
| { |
| if (charAt(i) != otherString.charAt(i)) |
| { |
| return false; |
| } |
| } |
| |
| return true; |
| |
| } |
| |
| public boolean startsWith(CharSequence otherString) |
| { |
| if (otherString.length() > length()) |
| { |
| return false; |
| } |
| |
| for (int i = 0; i < otherString.length(); i++) |
| { |
| if (charAt(i) != otherString.charAt(i)) |
| { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| |
| private final class CharSubSequence implements CharSequence |
| { |
| private final int _sequenceOffset; |
| private final int _end; |
| |
| public CharSubSequence(final int offset, final int end) |
| { |
| _sequenceOffset = offset; |
| _end = end; |
| } |
| |
| public int length() |
| { |
| return _end - _sequenceOffset; |
| } |
| |
| public char charAt(int index) |
| { |
| return AMQShortString.this.charAt(index + _sequenceOffset); |
| } |
| |
| public CharSequence subSequence(int start, int end) |
| { |
| return new CharSubSequence(start + _sequenceOffset, end + _sequenceOffset); |
| } |
| } |
| |
| public char[] asChars() |
| { |
| final int size = length(); |
| final char[] chars = new char[size]; |
| |
| for (int i = 0; i < size; i++) |
| { |
| chars[i] = (char) _data[i + _offset]; |
| } |
| |
| return chars; |
| } |
| |
| |
| public String asString() |
| { |
| if (_asString == null) |
| { |
| _asString = new String(asChars()); |
| } |
| return _asString; |
| } |
| |
| public boolean equals(Object o) |
| { |
| |
| |
| if(o instanceof AMQShortString) |
| { |
| return equals((AMQShortString)o); |
| } |
| if(o instanceof CharSequence) |
| { |
| return equals((CharSequence)o); |
| } |
| |
| if (o == null) |
| { |
| return false; |
| } |
| |
| if (o == this) |
| { |
| return true; |
| } |
| |
| |
| return false; |
| |
| } |
| |
| public boolean equals(final AMQShortString otherString) |
| { |
| if (otherString == this) |
| { |
| return true; |
| } |
| |
| if (otherString == null) |
| { |
| return false; |
| } |
| |
| final int hashCode = _hashCode; |
| |
| final int otherHashCode = otherString._hashCode; |
| |
| if ((hashCode != 0) && (otherHashCode != 0) && (hashCode != otherHashCode)) |
| { |
| return false; |
| } |
| |
| final int length = _length; |
| |
| if(length != otherString._length) |
| { |
| return false; |
| } |
| |
| |
| final byte[] data = _data; |
| |
| final byte[] otherData = otherString._data; |
| |
| final int offset = _offset; |
| |
| final int otherOffset = otherString._offset; |
| |
| if(offset == 0 && otherOffset == 0 && length == data.length && length == otherData.length) |
| { |
| return Arrays.equals(data, otherData); |
| } |
| else |
| { |
| int thisIdx = offset; |
| int otherIdx = otherOffset; |
| for(int i = length; i-- != 0; ) |
| { |
| if(!(data[thisIdx++] == otherData[otherIdx++])) |
| { |
| return false; |
| } |
| } |
| } |
| |
| return true; |
| |
| } |
| |
| public boolean equals(CharSequence s) |
| { |
| if(s instanceof AMQShortString) |
| { |
| return equals((AMQShortString)s); |
| } |
| |
| if (s == null) |
| { |
| return false; |
| } |
| |
| if (s.length() != length()) |
| { |
| return false; |
| } |
| |
| for (int i = 0; i < length(); i++) |
| { |
| if (charAt(i) != s.charAt(i)) |
| { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| public int hashCode() |
| { |
| int hash = _hashCode; |
| if (hash == 0) |
| { |
| final int size = length(); |
| |
| for (int i = 0; i < size; i++) |
| { |
| hash = (31 * hash) + _data[i+_offset]; |
| } |
| |
| _hashCode = hash; |
| } |
| |
| return hash; |
| } |
| |
| public void setDirty() |
| { |
| _hashCode = 0; |
| } |
| |
| public String toString() |
| { |
| return asString(); |
| } |
| |
| public int compareTo(AMQShortString name) |
| { |
| if (name == null) |
| { |
| return 1; |
| } |
| else |
| { |
| |
| if (name.length() < length()) |
| { |
| return -name.compareTo(this); |
| } |
| |
| for (int i = 0; i < length(); i++) |
| { |
| final byte d = _data[i+_offset]; |
| final byte n = name._data[i+name._offset]; |
| if (d < n) |
| { |
| return -1; |
| } |
| |
| if (d > n) |
| { |
| return 1; |
| } |
| } |
| |
| return (length() == name.length()) ? 0 : -1; |
| } |
| } |
| |
| |
| public AMQShortStringTokenizer tokenize(byte delim) |
| { |
| return new TokenizerImpl(delim); |
| } |
| |
| |
| public AMQShortString intern() |
| { |
| |
| hashCode(); |
| |
| Map<AMQShortString, WeakReference<AMQShortString>> localMap = |
| _localInternMap.get(); |
| |
| WeakReference<AMQShortString> ref = localMap.get(this); |
| AMQShortString internString; |
| |
| if(ref != null) |
| { |
| internString = ref.get(); |
| if(internString != null) |
| { |
| return internString; |
| } |
| } |
| |
| |
| synchronized(_globalInternMap) |
| { |
| |
| ref = _globalInternMap.get(this); |
| if((ref == null) || ((internString = ref.get()) == null)) |
| { |
| internString = shrink(); |
| ref = new WeakReference(internString); |
| _globalInternMap.put(internString, ref); |
| } |
| |
| } |
| localMap.put(internString, ref); |
| return internString; |
| |
| } |
| |
| private int occurences(final byte delim) |
| { |
| int count = 0; |
| final int end = _offset + _length; |
| for(int i = _offset ; i < end ; i++ ) |
| { |
| if(_data[i] == delim) |
| { |
| count++; |
| } |
| } |
| return count; |
| } |
| |
| private int indexOf(final byte val, final int pos) |
| { |
| |
| for(int i = pos; i < length(); i++) |
| { |
| if(_data[_offset+i] == val) |
| { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| |
| public static AMQShortString join(final Collection<AMQShortString> terms, |
| final AMQShortString delim) |
| { |
| if(terms.size() == 0) |
| { |
| return EMPTY_STRING; |
| } |
| |
| int size = delim.length() * (terms.size() - 1); |
| for(AMQShortString term : terms) |
| { |
| size += term.length(); |
| } |
| |
| byte[] data = new byte[size]; |
| int pos = 0; |
| final byte[] delimData = delim._data; |
| final int delimOffset = delim._offset; |
| final int delimLength = delim._length; |
| |
| |
| for(AMQShortString term : terms) |
| { |
| |
| if(pos!=0) |
| { |
| System.arraycopy(delimData, delimOffset,data,pos, delimLength); |
| pos+=delimLength; |
| } |
| System.arraycopy(term._data,term._offset,data,pos,term._length); |
| pos+=term._length; |
| } |
| |
| |
| |
| return new AMQShortString(data,0,size); |
| } |
| |
| public int toIntValue() |
| { |
| int pos = _offset; |
| int val = 0; |
| |
| |
| boolean isNegative = (_data[pos] == MINUS); |
| if(isNegative) |
| { |
| pos++; |
| } |
| |
| final int end = _length + _offset; |
| |
| while(pos < end) |
| { |
| int digit = (int) (_data[pos++] - ZERO); |
| if((digit < 0) || (digit > 9)) |
| { |
| throw new NumberFormatException("\""+toString()+"\" is not a valid number"); |
| } |
| val = val * 10; |
| val += digit; |
| } |
| if(isNegative) |
| { |
| val = val * -1; |
| } |
| return val; |
| } |
| |
| public boolean contains(final byte b) |
| { |
| final int end = _length + _offset; |
| for(int i = _offset; i < end; i++) |
| { |
| if(_data[i] == b) |
| { |
| return true; |
| } |
| } |
| return false; //To change body of created methods use File | Settings | File Templates. |
| } |
| |
| |
| public static void main(String args[]) |
| { |
| AMQShortString s = new AMQShortString("a.b.c.d.e.f.g.h.i.j.k"); |
| AMQShortString s2 = s.substring(2, 7); |
| |
| AMQShortStringTokenizer t = s2.tokenize((byte) '.'); |
| while(t.hasMoreTokens()) |
| { |
| System.err.println(t.nextToken()); |
| } |
| } |
| |
| } |