jkesselm 2002/05/31 13:37:04
Modified: java/src/org/apache/xml/utils FastStringBuffer.java
Log:
Starting branch for Xalan3
Revision Changes Path
1.20 +122 -1 xml-xalan/java/src/org/apache/xml/utils/FastStringBuffer.java
Index: FastStringBuffer.java
===================================================================
RCS file: /home/cvs/xml-xalan/java/src/org/apache/xml/utils/FastStringBuffer.java,v
retrieving revision 1.19
retrieving revision 1.20
diff -u -r1.19 -r1.20
--- FastStringBuffer.java 22 Apr 2002 19:26:02 -0000 1.19
+++ FastStringBuffer.java 31 May 2002 20:37:04 -0000 1.20
@@ -966,7 +966,7 @@
return sb;
}
-
+
/**
* Get a single character from the string buffer.
*
@@ -1372,5 +1372,126 @@
source.m_chunkBits += m_rebundleBits;
source.m_chunkSize = 1 << (source.m_chunkBits);
source.m_chunkMask = source.m_chunkSize - 1;
+ }
+
+ /** Yield substring value as a sequence of Character Blocks
+ * @return a CharacterBlockEnumeration displaying the contents of
+ * this object's string value (as in str()). May be empty, may
+ * yield multiple blocks depending on the FSB's contents. (The latter
+ * case is why we need to enumerate, of course!)
+ *
+ * @param start Offset of first character to be delivered
+ * @param length Number of contiguous characters to be delivered
+ * */
+ public org.apache.xml.utils.CharacterBlockEnumeration
enumerateCharacterBlocks(int start,int length)
+ {
+ // %REVIEW% %OPT% I'm not sure this is an optimization. Depends on
+ // how retrieval of char[] from String works in any given JVM.
+ // See comments in CharacterBlockEnumeration, and run some tests.
+ return new FSBCharacterBlockEnumeration(start,length);
+ }
+
+ /** FSB-specific implementation of CharacterBlockEnumeration.
+ *
+ * NOTE: This is _NOT_ guaranteed to tolerate attempts to modify the
+ * FSB's contents while it is executing!
+ *
+ * Inner class, since it's accessing FSB's implementation details
+ * and might as well leverage its ability to access the associated FSB.
+ * */
+ protected class FSBCharacterBlockEnumeration
+ extends org.apache.xml.utils.CharacterBlockEnumeration
+ {
+ int e_chunk; // Current enumeration position
+ int e_toBeDelivered; // Current enumeration status
+
+ /** Construct this enumeration
+ *
+ * %BUG% Does not currently support m_innerFSB. (I'm still deciding
+ * whether to rip out the innerFSB support entirely, or to fix it.)
+ *
+ * @param start Starting offset, in characters. If past available data,
+ * we return a single empty block.
+ * @param length Number of characters to deliver. If start+length is
+ * past available data, length will be truncated to fit.
+ * */
+ public FSBCharacterBlockEnumeration(int start,int length)
+ {
+ if(m_innerFSB!=null)
+ throw new java.lang.UnsupportedOperationException("Inner FSB not yet
implemented. Oops.");
+
+ int fsblength=length();
+ if (start<=fsblength)
+ {
+ int max=fsblength-start;
+ e_toBeDelivered=(length<max) ? length : max;
+
+ // Set up to display first chunk
+ e_chunk=start>>m_chunkBits;
+ _chars=m_array[e_chunk];
+ _start=start&m_chunkBits;
+ max=m_chunkSize-_start;
+ _length=(max<=e_toBeDelivered) ? max : e_toBeDelivered;
+ // and decrement what's left to go
+ e_toBeDelivered -= _length;
+ }
+ else
+ {
+ // Off the end. We can just leave it empty.
+ }
+ }
+
+ /** Disable superclass's ctor
+ * @throws java.lang.UnsupportedOperationException since not appropriate here.
+ * */
+ public FSBCharacterBlockEnumeration(String s)
+ { throw new java.lang.UnsupportedOperationException("Inappropriate ctor for
this subclass");
+ }
+ /** Disable superclass's ctor
+ * @throws java.lang.UnsupportedOperationException since not appropriate here.
+ * */
+ public FSBCharacterBlockEnumeration(String s, int start, int length)
+ { throw new java.lang.UnsupportedOperationException("Inappropriate ctor for
this subclass");
+ }
+ /** Disable superclass's ctor
+ * @throws java.lang.UnsupportedOperationException since not appropriate here.
+ * */
+ public FSBCharacterBlockEnumeration(char[] ch)
+ { throw new java.lang.UnsupportedOperationException("Inappropriate ctor for
this subclass");
+ }
+ /** Disable superclass's ctor
+ * @throws java.lang.UnsupportedOperationException since not appropriate here.
+ * */
+ public FSBCharacterBlockEnumeration(char[] ch, int start, int length)
+ { throw new java.lang.UnsupportedOperationException("Inappropriate ctor for
this subclass");
+ }
+
+ /** @return true if another character block can be accessed by calling
+ * nextElement()
+ */
+ public boolean hasMoreElements()
+ {
+ return e_toBeDelivered > 0;
+ }
+
+ /** Advance to the next character block.
+ *
+ * @returns either this CharacterBlockEnumeration object (as a
+ * transient accessor to the "element") or null if no more elements are
available.
+ * This is a bit of a kluge, but it allows us to claim that we
+ * implement the Java Enumeration interface if we want to do so, and
+ * it seems to be as good or bad as any other return value.
+ * */
+ public Object nextElement()
+ {
+ // Set up to display next chunk
+ _chars=m_array[++e_chunk];
+ _start=0;
+ _length=(m_chunkSize<=e_toBeDelivered) ? m_chunkSize : e_toBeDelivered;
+ // and decrement what's left to go
+ e_toBeDelivered -= _length;
+
+ return (e_toBeDelivered>0) ? this : null;
+ }
}
}
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