data.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

                    }
                }
            }
            rm = new DetailRowMaker(drf, ss);
        } else if (drf.getTableName().endsWith(".fit")) {
            rm = new FITRowMaker(drf);
        } else if (drf.getTableName().endsWith(".cft")
                || drf.getTableName().endsWith(".cjt")) {
            rm = new ComplexFeatureJoinRowMaker(drf);
        } else {
            rm = new PlainRowMaker();
        }

        Iterator rowiter;
        if (rowlist != null) {
            rowiter = new TableSubsetRecordIterator(rowlist, drf);
        } else if (printall) {
            rowiter = new TableListIterator(drf);
        } else if (parseall) {
            rowiter = new TableTestParseIterator(drf);
        } else {
            rowiter = new TableSampleIterator(drf);
        }
        // response.getWriter().println("<hr>Tn = " +
        // drf.getTableName() +
        // "<hr>" + rm.getClass().getName() + " " +
        // rowiter.getClass().getName() + "<hr>");
        int rowcount = 0;
        while (rowiter.hasNext()) {
            if (rowcount++ >= 99) {
                response.getWriter().println(redisplay);
                table.generate(response.getWriter());
                rows = new ListElement();
                table = new WrapElement("table", "BORDER=1 ALIGN=CENTER", rows);
                rows.addElement(new WrapElement("CAPTION", new StringElement("table data")));
                rows.addElement(thr);

                rowcount = 0;
            }
            rows.addElement(rm.generateRow((List) rowiter.next()));
        }
        rm.close();
        response.getWriter().println(redisplay);
        table.generate(response.getWriter());
    }

    public ContextInfo getContextInfo() {
        return contextInfo;
    }

    public static String joinURL(HttpServletRequest request,
                                 HttpServletResponse response, int tag,
                                 String filename, String colname,
                                 String othertable, String othertablekey,
                                 boolean isTiled) {
        String pathInfo = request.getPathInfo();
        int index = pathInfo.lastIndexOf('/');
        String subpath = pathInfo.substring(0, index + 1);
        String url = request.getContextPath() + request.getServletPath()
                + subpath + filename + "?" + JoinColumnParam + "=" + colname
                + "&" + JoinOtherTableParam + "=" + othertable + "&"
                + JoinOtherTableKeyParam + "=" + othertablekey + "&"
                + IsTiledParam + "=" + isTiled;
        String value = "<A HREF=\"" + response.encodeURL(url) + "\">" + tag
                + "</A>\r\n";
        return value;
    }

    /**
     * An iterator that returns a subset of the table rows
     */
    private static class TableSampleIterator implements Iterator {
        private final int recordCount;
        private final int columnCount;
        private int curRow = 0;
        private final DcwRecordFile drf;

        public TableSampleIterator(DcwRecordFile drf) throws FormatException {
            this.drf = drf;
            recordCount = drf.getRecordCount();
            columnCount = drf.getColumnCount();
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }

        public boolean hasNext() {
            return (curRow < recordCount);
        }

        public Object next() {
            if (curRow < 10) {
                curRow++;
            } else if (curRow == 10) {
                curRow = 100;
            } else {
                curRow += 100;
            }
            if (curRow > recordCount) {
                curRow = recordCount;
            }
            ArrayList al = new ArrayList(columnCount);
            try {
                if (!drf.getRow(al, curRow)) {
                    throw new NoSuchElementException();
                }
            } catch (FormatException fe) {
                throw new NoSuchElementException();
            }
            return al;
        }
    }

    /**
     * An iterator that returns a subset of the table rows, but parses
     * every record in the table.
     */
    private static class TableTestParseIterator implements Iterator {
        final ListIterator base;

        public TableTestParseIterator(DcwRecordFile drf) throws FormatException {
            base = new TableListIterator(drf);
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }

        public boolean hasNext() {
            return base.hasNext();
        }

        public Object next() {
            int index;
            Object ret;
            do {
                index = base.nextIndex();
                ret = base.next();
            } while ((index > 10) && ((index % 100) != 0) && base.hasNext());
            return ret;
        }
    }

    /**
     * An iterator that will return every row in the table.
     */
    private static class TableListIterator implements java.util.ListIterator {
        private int curRow = 1;
        private final DcwRecordFile drf;
        private final int columnCount;
        private final int recordCount;

        public TableListIterator(DcwRecordFile drf) throws FormatException {
            this.drf = drf;
            columnCount = drf.getColumnCount();
            recordCount = drf.getRecordCount();
        }

        public void add(Object o) {
            throw new UnsupportedOperationException();
        }

        public boolean hasPrevious() {
            return (curRow > 1);
        }

        public boolean hasNext() {
            return (curRow <= recordCount);
        }

        private ArrayList getRow(int row) {
            ArrayList al = new ArrayList(columnCount);
            try {
                if (!drf.getRow(al, row)) {
                    throw new NoSuchElementException();
                }
            } catch (FormatException fe) {
                throw new NoSuchElementException();
            }
            return al;
        }

        public Object next() {
            return getRow(curRow++);
        }

        public Object previous() {
            return getRow(--curRow);
        }

        public int nextIndex() {
            return curRow;
        }

        public int previousIndex() {
            return (curRow - 1);
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }

        public void set(Object o) {
            throw new UnsupportedOperationException();
        }
    }
}