svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / DefaultInterpreter.java @ 43809
History | View | Annotate | Download (7.39 KB)
1 |
package org.gvsig.expressionevaluator.impl; |
---|---|
2 |
|
3 |
import java.util.ArrayList; |
4 |
import java.util.Comparator; |
5 |
import java.util.Date; |
6 |
import java.util.HashMap; |
7 |
import java.util.List; |
8 |
import java.util.Map; |
9 |
import org.apache.commons.lang3.tuple.Pair; |
10 |
import org.gvsig.expressionevaluator.SymbolTable; |
11 |
import org.gvsig.expressionevaluator.Interpreter; |
12 |
import org.gvsig.expressionevaluator.Code; |
13 |
import org.gvsig.expressionevaluator.Code.Constant; |
14 |
import org.gvsig.expressionevaluator.Code.Identifier; |
15 |
import org.gvsig.expressionevaluator.Code.Caller; |
16 |
import org.gvsig.expressionevaluator.Code.Caller.Arguments; |
17 |
import org.gvsig.expressionevaluator.Function; |
18 |
import org.gvsig.expressionevaluator.impl.function.operator.BinaryOperator; |
19 |
import org.gvsig.expressionevaluator.impl.function.operator.UnaryOperator; |
20 |
|
21 |
public class DefaultInterpreter implements Interpreter { |
22 |
|
23 |
private class DefaultCache implements Cache { |
24 |
|
25 |
private Map<Pair<Object,Object>,Pair<Object,Long>> data; |
26 |
|
27 |
public DefaultCache() {
|
28 |
this.data = new HashMap<>(); |
29 |
} |
30 |
|
31 |
@Override
|
32 |
public Object get(Object context, Object key) { |
33 |
Pair<Object, Long> v = this.data.get( Pair.of(context, key) ); |
34 |
return v.getLeft();
|
35 |
} |
36 |
|
37 |
@Override
|
38 |
public void put(Object context, Object key, Object value) { |
39 |
if( this.data.size()>this.getMaxElements() ) { |
40 |
this.reduce();
|
41 |
} |
42 |
this.data.put(Pair.of(context, key), Pair.of(value, new Date().getTime())); |
43 |
} |
44 |
|
45 |
@Override
|
46 |
public void remove(Object context, Object key) { |
47 |
this.data.remove(Pair.of(context, key));
|
48 |
} |
49 |
|
50 |
@Override
|
51 |
public void removeAll() { |
52 |
this.data = new HashMap<>(); |
53 |
} |
54 |
|
55 |
private int getMaxElements() { |
56 |
return 100; |
57 |
} |
58 |
|
59 |
private void reduce() { |
60 |
List<Map.Entry<Pair<Object, Object>, Pair<Object, Long>>> entries = |
61 |
new ArrayList<>(this.data.entrySet()); |
62 |
entries.sort(new Comparator<Map.Entry<Pair<Object, Object>, Pair<Object, Long>>>() { |
63 |
@Override
|
64 |
public int compare(Map.Entry<Pair<Object, Object>, Pair<Object, Long>> o1, Map.Entry<Pair<Object, Object>, Pair<Object, Long>> o2) { |
65 |
return o1.getValue().getRight().compareTo(o2.getValue().getRight());
|
66 |
} |
67 |
}); |
68 |
for( int i=0; i<this.getMaxElements()/2; i++ ) { |
69 |
this.data.remove(entries.get(i).getKey());
|
70 |
} |
71 |
} |
72 |
|
73 |
} |
74 |
|
75 |
private SymbolTable symbolTable = null; |
76 |
private Double accuracy; |
77 |
private Code currentCode;
|
78 |
private Cache cache;
|
79 |
|
80 |
public DefaultInterpreter() {
|
81 |
this.cache = new DefaultCache(); |
82 |
} |
83 |
|
84 |
@Override
|
85 |
public Interpreter clone() throws CloneNotSupportedException { |
86 |
DefaultInterpreter other = (DefaultInterpreter) super.clone();
|
87 |
other.cache = new DefaultCache();
|
88 |
if( this.symbolTable!=null ) { |
89 |
other.symbolTable = this.symbolTable.clone();
|
90 |
} |
91 |
|
92 |
return other;
|
93 |
} |
94 |
|
95 |
@Override
|
96 |
public Cache getCache() {
|
97 |
return this.cache; |
98 |
} |
99 |
|
100 |
@Override
|
101 |
public void setSymbolTable(SymbolTable symbolTable) { |
102 |
this.symbolTable = symbolTable;
|
103 |
} |
104 |
|
105 |
@Override
|
106 |
public SymbolTable getSymbolTable() {
|
107 |
if( this.symbolTable==null ) { |
108 |
this.symbolTable = SQLSymbolTable.getInstance();
|
109 |
} |
110 |
return this.symbolTable; |
111 |
} |
112 |
@Override
|
113 |
public Double getAccuracy() { |
114 |
return this.accuracy; |
115 |
} |
116 |
|
117 |
@Override
|
118 |
public void setAccuracy(Double accuracy) { |
119 |
this.accuracy = accuracy;
|
120 |
} |
121 |
|
122 |
@Override
|
123 |
public Object run(Code code) { |
124 |
try {
|
125 |
return this.runCode(code); |
126 |
} catch (Exception ex) { |
127 |
throw new RuntimeException(ex); |
128 |
} |
129 |
} |
130 |
|
131 |
@Override
|
132 |
public void link(Code code) { |
133 |
linkCode(code); |
134 |
} |
135 |
|
136 |
private void linkCode(Code code) { |
137 |
if( code instanceof Caller ) { |
138 |
Caller caller = (Caller) code; |
139 |
if( caller.function() == null ) { |
140 |
caller.function(this.getSymbolTable().function(caller.name()));
|
141 |
} |
142 |
if( caller.args() != null ) { |
143 |
for( Code arg : caller.args() ) {
|
144 |
linkCode(arg); |
145 |
} |
146 |
} |
147 |
} |
148 |
} |
149 |
|
150 |
private Object runCode(Code code) throws Exception { |
151 |
this.currentCode = code;
|
152 |
Object value = null; |
153 |
switch( code.code() ) {
|
154 |
case Code.CONSTANT:
|
155 |
value = ((Constant) code).value(); |
156 |
break;
|
157 |
|
158 |
case Code.IDENTIFIER:
|
159 |
String name = ((Identifier) code).name();
|
160 |
if( !this.getSymbolTable().exists(name) ) { |
161 |
throw new RuntimeException("Variable '" + name + "' not found."); |
162 |
} |
163 |
value = this.getSymbolTable().value(name);
|
164 |
break;
|
165 |
|
166 |
case Code.CALLER:
|
167 |
Caller caller = (Caller) code; |
168 |
Function function = caller.function(); |
169 |
if( function == null ) { |
170 |
function = this.getSymbolTable().function(caller.name());
|
171 |
if( function == null ) { |
172 |
throw new RuntimeException("Function '" + caller.name() + "' not found."); |
173 |
} |
174 |
caller.function(function); |
175 |
} |
176 |
Arguments args = caller.args(); |
177 |
try {
|
178 |
switch( caller.type() ) {
|
179 |
case Caller.UNARY_OPERATOR:
|
180 |
if( args == null || args.count() != 1 ) { |
181 |
throw new RuntimeException("Number of argument mistmatch, expected 1 got " + args.count() + "."); |
182 |
} |
183 |
value = ((UnaryOperator) function).call(this, runCode(args.get(0))); |
184 |
break;
|
185 |
|
186 |
case Caller.BINARY_OPERATOR:
|
187 |
if( args == null || args.count() != 2 ) { |
188 |
throw new RuntimeException("Number of argument mistmatch, expected 2 got " + args.count() + "."); |
189 |
} |
190 |
value = ((BinaryOperator) function).call(this, runCode(args.get(0)), runCode(args.get(1))); |
191 |
break;
|
192 |
|
193 |
case Caller.FUNCTION:
|
194 |
int argc = (args == null) ? 0 : args.count(); |
195 |
if( !function.argc().contains(argc) ) {
|
196 |
throw new RuntimeException("Number of argument mistmatch, expected " + function.argc() + " got " + argc + "."); |
197 |
} |
198 |
Object[] argvalues = new Object[argc]; |
199 |
if( args != null ) { |
200 |
int i = 0; |
201 |
for( Code arg : args ) {
|
202 |
argvalues[i++] = runCode(arg); |
203 |
} |
204 |
} |
205 |
value = function.call(this, argvalues);
|
206 |
} |
207 |
} catch (Exception ex) { |
208 |
String argsstr = "???"; |
209 |
try {
|
210 |
argsstr = args.toString(); |
211 |
} catch(Exception ex2) { |
212 |
// Ignore.
|
213 |
} |
214 |
throw new RuntimeException("Problems calling function '"+function.name()+"' with args ("+argsstr+").", ex); |
215 |
} |
216 |
} |
217 |
this.currentCode = null; |
218 |
return value;
|
219 |
} |
220 |
|
221 |
@Override
|
222 |
public Code getCurrentCode() {
|
223 |
return this.currentCode; |
224 |
} |
225 |
} |