Examples of org.pdf4j.saxon.om.FastStringBuffer

org.pdf4j.saxon.om.FastStringBuffer
A simple implementation of a class similar to StringBuffer. Unlike StringBuffer it is not synchronized. It also offers the capability to remove unused space. (This class could possibly be replaced by StringBuilder in JDK 1.5, but using our own class gives more control.)

     * compare correctly under the equals() method.
     */


    public Object getCollationKey(String s) {
        // The string is normalized by removing leading zeros in a numeric component
        FastStringBuffer sb = new FastStringBuffer(s.length()*2);
        int pos1 = 0;
        Matcher m1 = pattern.matcher(s);
        while (true) {


            // find the next number in the string


            boolean b1 = m1.find(pos1);
            int m1start = (b1 ? m1.start() : s.length());


            // handle an alphabetic part (even if zero-length)


            sb.append(s.substring(pos1, m1start));


            // reached end?


            if (!b1) {
                return sb.toString();
            }


            // handle a numeric part


            int n1 = Integer.parseInt(s.substring(m1start, m1.end()));
            sb.append(n1 + "");


            // move on to the next part of the string


            pos1 = m1.end();
        }

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    public IntIterator iterator() {
        return new IntRangeSetIterator();
    }


    public String toString() {
        FastStringBuffer sb = new FastStringBuffer(used*8);
        for (int i=0; i<used; i++) {
            sb.append(startPoints[i] + "-" + endPoints[i] + ",");
        }
        return sb.toString();
    }

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     */
    public static String wrap(CharSequence cs, int valueType) {
        if (cs == null) {
            return "(NULL)";
        }
        FastStringBuffer sb = new FastStringBuffer(40);
        int len = cs.length();
        for (int i=0; i<len; i++) {
            char c = cs.charAt(i);
            switch (c) {
                case '\n':
                    sb.append("\\n");
                    break;
                case '\t':
                    sb.append("\\t");
                    break;
                case '\r':
                    sb.append("\\r");
                    break;
//                case '\\':
//                    sb.append("\\\\");
//                    break;
                default:
                    if (c < 32 || c > 255) {
                        sb.append("\\u");
                        String hex = Integer.toHexString(c);
                        while (hex.length() < 4) {
                            hex = "0" + hex;
                        }
                        sb.append(hex);
                    } else {
                        sb.append(c);
                    }
            }
        }
        String s;
        if (len > 30) {
            if (valueType == URI) {
                s = "..." + sb.toString().substring(len-30);
            } else {
                s = sb.toString().substring(0, 30) + "...";
            }
        } else {
            s = sb.toString();
        }
        switch (valueType) {
            case ELEMENT:
                return "<" + s + ">";
            case ATTRIBUTE:

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            if (ch(start[0]) == '<' && ch(start[1]) == '?' &&
                    ch(start[2]) == 'x' && ch(start[3]) == 'm' && ch(start[4]) == 'l') {
                if (debug) {
                    System.err.println("unparsed-text(): found XML declaration");
                }
                FastStringBuffer sb = new FastStringBuffer(read);
                for (int b = 0; b < read; b++) {
                    sb.append((char)start[b]);
                }
                String p = sb.toString();
                int v = p.indexOf("encoding");
                if (v >= 0) {
                    v += 8;
                    while (v < p.length() && " \n\r\t=\"'".indexOf(p.charAt(v)) >= 0) {
                        v++;
                    }
                    sb.setLength(0);
                    while (v < p.length() && p.charAt(v) != '"' && p.charAt(v) != '\'') {
                        sb.append(p.charAt(v++));
                    }
                    if (debug) {
                        System.err.println("unparsed-text(): encoding in XML declaration = " + sb.toString());
                    }
                    return sb.toString();
                }
                if (debug) {
                    System.err.println("unparsed-text(): no encoding found in XML declaration");
                }
            }

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     * @param args command line arguments (collationURI, test-string)
     */
    public static void main(String[] args) {
        Configuration config = new Configuration();
        StringCollator collator = StandardCollationURIResolver.getInstance().resolve(args[0], args[0], config);
        FastStringBuffer sb = new FastStringBuffer(100);
        if (collator instanceof RuleBasedCollator) {
            CollationElementIterator iter = ((RuleBasedCollator)collator).getCollationElementIterator(args[1]);
            while (true) {
                int e = iter.next();
                if (e==-1) {
                    break;
                }
                sb.append(e+" ");
            }
            System.err.println(sb.toString());
        }


    }

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     * Diagnostic output
     */


    public void diagnosticDump() {
        System.err.println("Contents of IntHashSet");
        FastStringBuffer sb = new FastStringBuffer(100);
        for (int i = 0; i < _values.length; i++) {
            if (i % 10 == 0) {
                System.err.println(sb.toString());
                sb.setLength(0);
            }
            if (_values[i] == ndv) {
                sb.append("*, ");
            } else {
                sb.append(_values[i] + ", ");
            }
        }
        System.err.println(sb.toString());
        sb.setLength(0);
        System.err.println("size: " + _size);
        System.err.println("ndv: " + ndv);
        System.err.println("nlo: " + _nlo);
        System.err.println("nhi: " + _nhi);
        System.err.println("nmax: " + _nmax);
        System.err.println("shift: " + _shift);
        System.err.println("mask: " + _mask);
        System.err.println("Result of iterator:");
        IntIterator iter = iterator();
        int i = 0;
        while (iter.hasNext()) {
            if (i++ % 10 == 0) {
                System.err.println(sb.toString());
                sb.setLength(0);
            }
            sb.append(iter.next() + ", ");
        }
        System.err.println(sb.toString());
        System.err.println("=====================");
    }

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        }
        if (s.indexOf('%') < 0) {
            return s;
        }


        FastStringBuffer sb = new FastStringBuffer(n);
        ByteBuffer bb = ByteBuffer.allocate(n);
        Charset utf8 = Charset.forName("UTF-8");


        // This is not horribly efficient, but it will do for now
        char c = s.charAt(0);
        boolean betweenBrackets = false;


        for (int i = 0; i < n;) {
            assert c == s.charAt(i);    // Loop invariant
            if (c == '[') {
                betweenBrackets = true;
            } else if (betweenBrackets && c == ']') {
                betweenBrackets = false;
            }
            if (c != '%' || betweenBrackets) {
                sb.append(c);
                if (++i >= n) {
                    break;
                }
                c = s.charAt(i);
                continue;
            }
            bb.clear();
            for (; ;) {
                assert (n - i >= 2);
                bb.put(hex(s.charAt(++i), s.charAt(++i)));
                if (++i >= n) {
                    break;
                }
                c = s.charAt(i);
                if (c != '%') {
                    break;
                }
            }
            bb.flip();
            sb.append(utf8.decode(bb));
        }


        return sb.toString();
    }

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    private IntArraySet(int[] content) {
        contents = content;
    }


    public String toString() {
        FastStringBuffer sb = new FastStringBuffer(contents.length*4);
        for (int i=0; i<contents.length; i++) {
            if (i == contents.length - 1) {
                sb.append(contents[i] + "");
            } else if (contents[i]+1 != contents[i+1]) {
                sb.append(contents[i] + ",");
            } else {
                int j = i+1;
                while (contents[j] == contents[j-1]+1) {
                    j++;
                    if (j == contents.length) {
                        break;
                    }
                }
                sb.append(contents[i] + "-" + contents[j-1] + ",");
                i = j;
            }
        }
        return sb.toString();
    }

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     * @return a message display of the contents of the sequence
     */


    public static String depictSequenceStart(SequenceIterator seq, int max) {
        try {
            FastStringBuffer sb = new FastStringBuffer(100);
            int count = 0;
            sb.append(" (");
            while (true) {
                Item next = seq.next();
                if (next == null) {
                    sb.append(") ");
                    return sb.toString();
                }
                if (count++ > 0) {
                    sb.append(", ");
                }
                if (count > max) {
                    sb.append("...) ");
                    return sb.toString();
                }


                sb.append(Err.depict(next));
            }
        } catch (XPathException e) {
            return "";
        }
    }

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     * in an XPath-like form, but there is no guarantee that the syntax will actually be true XPath.
     * In the case of XSLT instructions, the toString() method gives an abstracted view of the syntax
     */


    public String toString() {
        FastStringBuffer buff = new FastStringBuffer(120);
        buff.append(getDisplayName());
        Iterator iter = iterateSubExpressions();
        boolean first = true;
        while (iter.hasNext()) {
            buff.append(first ? "(" : ", ");
            buff.append(iter.next().toString());
            first = false;
        }
        buff.append(first ? "()" : ")");
        return buff.toString();
    }

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