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SpatialArgsParser.cs
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SpatialArgsParser.cs
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/*
* 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.
*/
using System;
using System.Collections.Generic;
using System.Text;
using Spatial4n.Core.Context;
using Spatial4n.Core.Exceptions;
using Spatial4n.Core.Io;
using Spatial4n.Core.Shapes;
namespace Lucene.Net.Spatial.Queries
{
public class SpatialArgsParser
{
/// <summary>
/// Writes a close approximation to the parsed input format.
/// </summary>
/// <param name="args"></param>
/// <returns></returns>
public static String WriteSpatialArgs(SpatialArgs args)
{
var str = new StringBuilder();
str.Append(args.Operation.GetName());
str.Append('(');
str.Append(args.Shape);
if (args.DistErrPct != null)
str.Append(" distErrPct=").Append(String.Format("{0:0.00}%", args.DistErrPct*100d));
if (args.DistErr != null)
str.Append(" distErr=").Append(args.DistErr);
str.Append(')');
return str.ToString();
}
/// <summary>
/// Parses a string such as "Intersects(-10,20,-8,22) distErrPct=0.025".
/// </summary>
/// <param name="v"></param>
/// <param name="ctx"></param>
/// <returns></returns>
public SpatialArgs Parse(String v, SpatialContext ctx)
{
int idx = v.IndexOf('(');
int edx = v.LastIndexOf(')');
if (idx < 0 || idx > edx)
{
throw new ArgumentException("missing parens: " + v);
}
SpatialOperation op = SpatialOperation.Get(v.Substring(0, idx).Trim());
//Substring in .NET is (startPosn, length), But in Java it's (startPosn, endPosn)
//see http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/String.html#substring(int, int)
String body = v.Substring(idx + 1, edx - (idx + 1)).Trim();
if (body.Length < 1)
{
throw new ArgumentException("missing body : " + v);
}
Shape shape = new ShapeReadWriter(ctx).ReadShape(body);
var args = new SpatialArgs(op, shape);
if (v.Length > (edx + 1))
{
body = v.Substring(edx + 1).Trim();
if (body.Length > 0)
{
Dictionary<String, String> aa = ParseMap(body);
args.DistErrPct = ReadDouble(aa["distErrPct"]); aa.Remove("distErrPct");
args.DistErr = ReadDouble(aa["distErr"]); aa.Remove("distErr");
if (aa.Count != 0)
{
throw new ArgumentException("unused parameters: " + aa);
}
}
}
args.Validate();
return args;
}
protected static double? ReadDouble(String v)
{
double val;
return double.TryParse(v, out val) ? val : (double?)null;
}
protected static bool ReadBool(String v, bool defaultValue)
{
bool ret;
return bool.TryParse(v, out ret) ? ret : defaultValue;
}
/// <summary>
/// Parses "a=b c=d f" (whitespace separated) into name-value pairs. If there
/// is no '=' as in 'f' above then it's short for f=f.
/// </summary>
/// <param name="body"></param>
/// <returns></returns>
protected static Dictionary<String, String> ParseMap(String body)
{
var map = new Dictionary<String, String>();
int tokenPos = 0;
var st = body.Split(new[] {' ', '\n', '\t'}, StringSplitOptions.RemoveEmptyEntries);
while (tokenPos < st.Length)
{
String a = st[tokenPos++];
int idx = a.IndexOf('=');
if (idx > 0)
{
String k = a.Substring(0, idx);
String v = a.Substring(idx + 1);
map[k] = v;
}
else
{
map[a] = a;
}
}
return map;
}
}
}