Source Code Cross Referenced for ParseHierarchy.java in  » GIS » GeoTools-2.4.1 » org » geotools » xml » impl » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.xml.impl 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2002-2006, GeoTools Project Managment Committee (PMC)
005:         *
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation;
009:         *    version 2.1 of the License.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         */
016:        package org.geotools.xml.impl;
017:
018:        /**
019:         * A utility class used to parse objects in a type hierarchy.
020:         *
021:         * @author Justin Deoliveira,Refractions Research Inc.,jdeolive@refractions.net
022:         *TODO: kill this class
023:         */
024:        public class ParseHierarchy {
025:            //	XSDTypeDefinition bottom;
026:            //	StrategyFactory factory;
027:            //	
028:            //	List strategies;
029:            //	
030:            //	ParseHierarchy(XSDTypeDefinition bottom, StrategyFactory factory) {
031:            //		this.bottom = bottom;
032:            //		this.factory = factory;
033:            //		strategies = new ArrayList();
034:            //	}
035:            //	
036:            //	/**
037:            //	 * Initialized the hierarchy by walking from the bottom type up.
038:            //	 */
039:            //	void initialize(MutablePicoContainer context) {
040:            //		strategies.clear();
041:            //		
042:            //		XSDTypeDefinition type = bottom;
043:            //		while(type != null) {
044:            //			//look up the associated strategy object for this type
045:            //			Strategy strategy = null; 
046:            //			if (type.getName() != null) {
047:            //				QName qName = new QName(type.getTargetNamespace(),type.getName());
048:            //				Class strategyClass = factory.getStrategy(qName);
049:            //				strategy = (Strategy) 
050:            //					context.getComponentInstanceOfType(strategyClass);
051:            //				if (strategy == null) {
052:            //					context.registerComponentImplementation(strategyClass);
053:            //					strategy = (Strategy) 
054:            //						context.getComponentInstanceOfType(strategyClass);
055:            //				}
056:            //			}
057:            //			else {
058:            //				//special case check, look for an anonymous complex type 
059:            //				// with simple content
060:            //				if (type instanceof XSDComplexTypeDefinition && 
061:            //						type.getBaseType() instanceof XSDSimpleTypeDefinition) {
062:            //					//we assign the default complex strategy instread of 
063:            //					// delegating to parent, because if we dont, any attributes
064:            //					// defined by the type will not be parsed because simple
065:            //					// types cannot have attributes.
066:            //					//TODO: put this somewhere else, perahps in teh factories
067:            //					// that create the strategy objects
068:            //					strategy = new XSAnyTypeStrategy();
069:            //				}
070:            //			}
071:            //			
072:            //			if (strategy != null) {
073:            //				//add the strategy
074:            //				strategies.add(strategy);
075:            //				
076:            //				//check execution mode, if override break out
077:            //				if (strategy.getExecutionMode() == Strategy.OVERRIDE)
078:            //					break;
079:            //			}
080:            //			else {
081:            //				//two posibilities
082:            //				if (!strategies.isEmpty()) {
083:            //					//make the last strategy the new root of the hierarchy
084:            //					break;
085:            //				}
086:            //				//else continue on to try to find a strategy further up in 
087:            //				// type hierarchy	
088:            //			}
089:            //		
090:            //			//get the next base type, if it is equal to this type then we have
091:            //			// reached the root of the type hierarchy
092:            //			if (type.equals(type.getBaseType()))
093:            //				break;
094:            //			type = type.getBaseType();
095:            //		}
096:            //	}
097:            //	
098:            //	/**
099:            //	 * Performs the parse in the order specified by the type hierarchy.
100:            //	 * 
101:            //	 * @param element The element being parsed.
102:            //	 * @param children The parsed values of any children.
103:            //	 * @param attrs The parsed values of any attributes.
104:            //	 * 
105:            //	 * @return the final parsed value for the element.
106:            //	 */
107:            //	Object parse(InstanceComponent instance, Node[] children, Node[] attrs) {
108:            //		//never pass null arguments to strategies
109:            //		children = children != null ? children : new Node[]{};
110:            //		attrs = attrs != null ? attrs : new Node[]{};
111:            //		
112:            //		//last parsed, null for first in execution order
113:            //		Object value = null;
114:            //		
115:            //		//before we do anything, process any facets
116:            //		value = parseFacets(instance);
117:            //	
118:            //		//simulated call stack
119:            //		Stack stack = new Stack();
120:            //		//execute strategies from bottom to top
121:            //		for (int i = 0; i < strategies.size(); i++) {
122:            //			Strategy strategy = (Strategy) strategies.get(i);
123:            //			
124:            //			if (strategy.getExecutionMode() == Strategy.AFTER) {
125:            //				//put on stack to execute after parent
126:            //				stack.push(strategy);
127:            //				continue;
128:            //			}
129:            //			
130:            //			//execute the strategy
131:            //			try {
132:            //				if (strategy instanceof SimpleStrategy) {
133:            //					value = ((SimpleStrategy)strategy).parse(instance,value);	
134:            //				}
135:            //				else {
136:            //					value = ((ComplexStrategy)strategy)
137:            //						.parse((Element)instance,children,attrs,value);
138:            //				}
139:            //				
140:            //			} 
141:            //			catch (Throwable t) {
142:            //				String msg = "Parsing failed for " + instance.getName();
143:            //				throw new RuntimeException(msg, t); 
144:            //			}
145:            //		}
146:            //		
147:            //		//unwind the call stack
148:            //		while(!stack.isEmpty()) {
149:            //			Strategy strategy = (Strategy)stack.pop();
150:            //			try {
151:            //				if (strategy instanceof SimpleStrategy) {
152:            //					value = ((SimpleStrategy)strategy).parse(instance,value);	
153:            //				}
154:            //				else {
155:            //					value = ((ComplexStrategy)strategy)
156:            //						.parse((Element) instance,children,attrs,value);
157:            //				}
158:            //			}
159:            //			catch(Throwable t) {
160:            //				String msg = "Parsing failed for " + instance.getName();
161:            //				throw new RuntimeException(msg, t);
162:            //			}
163:            //		}
164:            //		
165:            //		return value;
166:            //	
167:            //	}
168:        }
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