mirror of
https://github.com/servalproject/serval-dna.git
synced 2024-12-25 15:51:08 +00:00
118 lines
3.9 KiB
Java
118 lines
3.9 KiB
Java
/**
|
|
* Copyright (C) 2014 Serval Project Inc.
|
|
*
|
|
* This file is part of Serval Software (http://www.servalproject.org)
|
|
*
|
|
* Serval Software is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This source code is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this source code; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
package org.servalproject.json;
|
|
|
|
import java.lang.reflect.InvocationTargetException;
|
|
import java.io.IOException;
|
|
import java.util.Vector;
|
|
import java.util.Map;
|
|
import java.util.HashMap;
|
|
import java.util.HashSet;
|
|
|
|
public class JSONTableScanner {
|
|
|
|
private static class Column {
|
|
public boolean supported;
|
|
public String label;
|
|
public Class type;
|
|
public JSONTokeniser.Narrow opts;
|
|
}
|
|
|
|
HashMap<String,Column> columnMap;
|
|
Column[] columns;
|
|
|
|
public JSONTableScanner()
|
|
{
|
|
columnMap = new HashMap<String,Column>();
|
|
}
|
|
|
|
public JSONTableScanner addColumn(String label, Class type)
|
|
{
|
|
return addColumn(label, type, JSONTokeniser.Narrow.NO_NULL);
|
|
}
|
|
|
|
public JSONTableScanner addColumn(String label, Class type, JSONTokeniser.Narrow opts)
|
|
{
|
|
assert !columnMap.containsKey(label);
|
|
Column col = new Column();
|
|
col.label = label;
|
|
col.type = type;
|
|
col.opts = opts;
|
|
col.supported = JSONTokeniser.supportsNarrowTo(col.type);
|
|
columnMap.put(label, col);
|
|
return this;
|
|
}
|
|
|
|
public void consumeHeaderArray(JSONTokeniser json) throws IOException, JSONInputException
|
|
{
|
|
Vector<String> headers = new Vector<String>();
|
|
json.consumeArray(headers, String.class);
|
|
if (headers.size() < 1)
|
|
throw new JSONInputException("malformed JSON table, empty headers array");
|
|
columns = new Column[headers.size()];
|
|
HashSet<String> headerSet = new HashSet<String>(columnMap.size());
|
|
for (int i = 0; i < headers.size(); ++i) {
|
|
String header = headers.get(i);
|
|
if (columnMap.containsKey(header)) {
|
|
if (headerSet.contains(header))
|
|
throw new JSONInputException("malformed JSON table, duplicate column header: \"" + header + "\"");
|
|
headerSet.add(header);
|
|
columns[i] = columnMap.get(header);
|
|
}
|
|
}
|
|
for (String header: columnMap.keySet())
|
|
if (!headerSet.contains(header))
|
|
throw new JSONInputException("malformed JSON table, missing column header: \"" + header + "\"");
|
|
}
|
|
|
|
@SuppressWarnings("unchecked")
|
|
public Map<String,Object> consumeRowArray(JSONTokeniser json) throws IOException, JSONInputException
|
|
{
|
|
Object[] row = new Object[columns.length];
|
|
json.consumeArray(row, JSONTokeniser.Narrow.ALLOW_NULL);
|
|
HashMap<String,Object> rowMap = new HashMap<String,Object>(row.length);
|
|
for (int i = 0; i < row.length; ++i) {
|
|
Column col = columns[i];
|
|
Object value = null;
|
|
if (col != null) {
|
|
try {
|
|
if (col.supported)
|
|
value = JSONTokeniser.narrow(row[i], col.type, col.opts);
|
|
else {
|
|
value = JSONTokeniser.narrow(row[i], col.opts);
|
|
if (value != null)
|
|
value = col.type.getConstructor(value.getClass()).newInstance(value);
|
|
}
|
|
rowMap.put(col.label, value);
|
|
} catch (JSONInputException e){
|
|
throw new JSONInputException("invalid column value: " + col.label + "; " + e.getMessage(), e);
|
|
|
|
} catch (InvocationTargetException e) {
|
|
throw new JSONInputException("invalid column value: " + col.label + "=\"" + value + "\"", e.getTargetException());
|
|
} catch (Exception e) {
|
|
throw new JSONInputException("invalid column value: " + col.label + "=\"" + value + "\"", e);
|
|
}
|
|
}
|
|
}
|
|
return rowMap;
|
|
}
|
|
}
|