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src.gov.nasa.worldwind.formats.json.BasicJSONEventParser Maven / Gradle / Ivy
World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.formats.json;
import gov.nasa.worldwind.avlist.*;
import gov.nasa.worldwind.util.Logging;
import java.io.IOException;
import java.util.*;
/**
* @author dcollins
* @version $Id: BasicJSONEventParser.java 1171 2013-02-11 21:45:02Z dcollins $
*/
public class BasicJSONEventParser implements JSONEventParser
{
protected AVList fields;
protected List array;
public BasicJSONEventParser()
{
}
public Object parse(JSONEventParserContext ctx, JSONEvent event) throws IOException
{
if (ctx == null)
{
String message = Logging.getMessage("nullValue.ParserContextIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (event == null)
{
String message = Logging.getMessage("nullValue.EventIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (event.isStartObject())
return this.parseObject(ctx, event);
else if (event.isStartArray())
return this.parseArray(ctx, event);
else if (event.isScalarValue())
return this.parseScalarContent(ctx, event);
else
{
Logging.logger().warning(Logging.getMessage("generic.UnexpectedEvent", event));
return null;
}
}
protected JSONEventParser allocate(JSONEventParserContext ctx, JSONEvent event)
{
if (ctx == null)
{
String message = Logging.getMessage("nullValue.ParserContextIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (event == null)
{
String message = Logging.getMessage("nullValue.EventIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
return ctx.allocate(event);
}
//**************************************************************//
//******************** Object Parsing ************************//
//**************************************************************//
protected Object parseObject(JSONEventParserContext ctx, JSONEvent event) throws IOException
{
if (!event.isStartObject())
{
String message = Logging.getMessage("generic.InvalidEvent", event);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
for (event = ctx.nextEvent(); ctx.hasNext(); event = ctx.nextEvent())
{
if (event == null)
continue;
if (event.isEndObject())
break;
else if (event.isFieldName())
this.parseObjectField(ctx, event);
else
Logging.logger().warning(Logging.getMessage("generic.UnexpectedEvent", event));
}
return this.resolveObject(ctx, event);
}
protected void parseObjectField(JSONEventParserContext ctx, JSONEvent event) throws IOException
{
if (!event.isFieldName())
{
String message = Logging.getMessage("generic.InvalidEvent", event);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
ctx.pushFieldName(event.getFieldName());
if (ctx.hasNext())
{
JSONEvent valueEvent = ctx.nextEvent();
if (valueEvent.isStartObject() || valueEvent.isStartArray())
this.addFieldContent(ctx, this.parseComplexContent(ctx, valueEvent));
else if (valueEvent.isScalarValue())
this.addFieldContent(ctx, this.parseScalarContent(ctx, valueEvent));
else
{
Logging.logger().warning(Logging.getMessage("generic.UnexpectedEvent", valueEvent));
}
}
else
{
this.addFieldContent(ctx, null);
}
ctx.popFieldName();
}
protected void addFieldContent(JSONEventParserContext ctx, Object value)
{
if (this.fields == null)
this.fields = new AVListImpl();
this.fields.setValue(ctx.getCurrentFieldName(), value);
}
protected Object resolveObject(JSONEventParserContext ctx, JSONEvent event)
{
return this.fields;
}
//**************************************************************//
//******************** Array Parsing *************************//
//**************************************************************//
protected Object parseArray(JSONEventParserContext ctx, JSONEvent event) throws IOException
{
if (!event.isStartArray())
{
String message = Logging.getMessage("generic.InvalidEvent", event);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
for (event = ctx.nextEvent(); ctx.hasNext(); event = ctx.nextEvent())
{
if (event == null)
continue;
if (event.isEndArray())
break;
this.parseArrayEntry(ctx, event);
}
return this.resolveArray(ctx, event);
}
protected void parseArrayEntry(JSONEventParserContext ctx, JSONEvent event) throws IOException
{
if (event.isStartObject() || event.isStartArray())
this.addArrayEntry(this.parseComplexContent(ctx, event));
else if (event.isScalarValue())
this.addArrayEntry(this.parseScalarContent(ctx, event));
else
{
Logging.logger().warning(Logging.getMessage("generic.UnexpectedEvent", event));
}
}
protected void addArrayEntry(Object o)
{
if (this.array == null)
this.array = new ArrayList();
this.array.add(o);
}
protected Object resolveArray(JSONEventParserContext ctx, JSONEvent event)
{
return this.array.toArray(new Object[this.array.size()]);
}
//**************************************************************//
//******************** Content Parsing ************************//
//**************************************************************//
protected Object parseComplexContent(JSONEventParserContext ctx, JSONEvent event) throws IOException
{
JSONEventParser parser = this.allocate(ctx, event);
if (parser == null)
parser = ctx.getUnrecognizedParser();
return (parser != null) ? parser.parse(ctx, event) : null;
}
@SuppressWarnings({"UnusedDeclaration"})
protected Object parseScalarContent(JSONEventParserContext ctx, JSONEvent event) throws IOException
{
return event.asScalarValue();
}
}
