RandomSec/main/src/com/google/refine/util/JSONUtilities.java

/*

Copyright 2010, Google Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
    * Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

package com.google.refine.util;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;

public class JSONUtilities {
    static public String getString(JSONObject obj, String key, String def) {
        try {
            return obj.getString(key);
        } catch (JSONException e) {
            return def;
        }
    }
    
    static public int getInt(JSONObject obj, String key, int def) {
        try {
            return obj.getInt(key);
        } catch (JSONException e) {
            return def;
        }
    }
    
    static public boolean getBoolean(JSONObject obj, String key, boolean def) {
        try {
            return obj.getBoolean(key);
        } catch (JSONException e) {
            return def;
        }
    }
    
    static public double getDouble(JSONObject obj, String key, double def) {
        try {
            return obj.getDouble(key);
        } catch (JSONException e) {
            return def;
        }
    }
    
    static public long getLong(JSONObject obj, String key, long def) {
        try {
            return obj.getLong(key);
        } catch (JSONException e) {
            return def;
        }
    }
    
    static public Date getDate(JSONObject obj, String key, Date def) {
        try {
            Date d = ParsingUtilities.stringToDate(obj.getString(key));
            
            return d != null ? d : def;
        } catch (JSONException e) {
            return def;
        }
    }
    
    static public int[] getIntArray(JSONObject obj, String key) {
        try {
            JSONArray a = obj.getJSONArray(key);
            int[] r = new int[a.length()];
            
            for (int i = 0; i < r.length; i++) {
                r[i] = a.getInt(i);
            }
            
            return r;
        } catch (JSONException e) {
            return new int[0];
        }
    }
    
    static public String[] getStringArray(JSONObject obj, String key) {
        try {
            JSONArray a = obj.getJSONArray(key);
            String[] r = new String[a.length()];
            
            for (int i = 0; i < r.length; i++) {
                r[i] = a.getString(i);
            }
            
            return r;
        } catch (JSONException e) {
            return new String[0];
        }
    }
    
    static public void getStringList(JSONObject obj, String key, List<String> list) {
        try {
            JSONArray a = obj.getJSONArray(key);
            int count = a.length();
            
            for (int i = 0; i < count; i++) {
                list.add(a.getString(i));
            }
        } catch (JSONException e) {
        }
    }
    
    static public void writeStringList(JSONWriter writer, List<String> list) throws JSONException {
        writer.array();
        for (String s : list) {
            writer.value(s);
        }
        writer.endArray();
    }
    
    static public void putField(JSONObject obj, String key, Object value) throws JSONException {
    	if (value instanceof Integer) {
    		obj.put(key, ((Integer) value).intValue());
    	} else if (value instanceof Long) {
    		obj.put(key, ((Long) value).intValue());
    	} else if (value instanceof Number) {
    		obj.put(key, ((Double) value).doubleValue());
    	} else if (value instanceof Boolean) {
    		obj.put(key, (Boolean) value);
    	} else if (value instanceof Date) {
    		obj.put(key, ParsingUtilities.dateToString((Date) value));
    	} else if (value instanceof Calendar) {
    		obj.put(key, ParsingUtilities.dateToString(((Calendar) value).getTime()));
    	} else if (value instanceof String) {
    		obj.put(key, (String) value);
    	} else {
    		obj.put(key, value.toString());
    	}
    }
    
    static public Object[] toArray(JSONArray a) throws JSONException {
        int l = a.length();
        
        Object[] a2 = new Object[l];
        for (int i = 0; i < l; i++) {
            a2[i] = a.get(i);
        }
        
        return a2;
    }
    
    static public List<String> toStringList(JSONArray a) throws JSONException {
        int l = a.length();
        
        List<String> list = new ArrayList<String>();
        for (int i = 0; i < l; i++) {
            list.add(a.getString(i));
        }
        
        return list;
    }
}