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 / DefaultOptimizer.java @ 44243
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| 1 | 44009 | jjdelcerro | package org.gvsig.expressionevaluator.impl; |
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| 2 | |||
| 3 | import org.gvsig.expressionevaluator.Optimizer; |
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| 4 | import java.util.Collection; |
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| 5 | import java.util.Collections; |
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| 6 | import java.util.Iterator; |
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| 7 | import org.gvsig.expressionevaluator.Code; |
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| 8 | import org.gvsig.expressionevaluator.Code.Caller; |
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| 9 | import org.gvsig.expressionevaluator.CodeBuilder; |
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| 10 | import org.gvsig.expressionevaluator.Function; |
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| 11 | import org.gvsig.expressionevaluator.Interpreter; |
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| 12 | import org.gvsig.expressionevaluator.SymbolTable; |
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| 13 | 44139 | jjdelcerro | import org.gvsig.expressionevaluator.impl.DefaultCodeBuilder.BaseCodes; |
| 14 | 44009 | jjdelcerro | import org.gvsig.tools.script.Script; |
| 15 | |||
| 16 | /**
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| 17 | *
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| 18 | * @author jjdelcerro
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| 19 | */
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| 20 | public class DefaultOptimizer implements Optimizer { |
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| 21 | |||
| 22 | private static class OptimizerSymbolTable implements SymbolTable { |
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| 23 | |||
| 24 | private SymbolTable symbolTable;
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| 25 | |||
| 26 | public OptimizerSymbolTable() {
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| 27 | |||
| 28 | } |
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| 29 | |||
| 30 | public SymbolTable getSymbolTable() {
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| 31 | return this.symbolTable; |
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| 32 | } |
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| 33 | |||
| 34 | public void setSymbolTable(SymbolTable symbolTable) { |
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| 35 | this.symbolTable = symbolTable;
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| 36 | } |
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| 37 | |||
| 38 | @Override
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| 39 | public String getName() { |
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| 40 | return "Optimizer"; |
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| 41 | } |
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| 42 | |||
| 43 | @Override
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| 44 | 44215 | jjdelcerro | public boolean addSymbolTable(SymbolTable symbolTable) { |
| 45 | 44009 | jjdelcerro | throw new UnsupportedOperationException("Not supported yet."); |
| 46 | } |
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| 47 | |||
| 48 | @Override
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| 49 | 44215 | jjdelcerro | public boolean containsSymbolTable(SymbolTable symbolTable) { |
| 50 | throw new UnsupportedOperationException("Not supported yet."); |
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| 51 | } |
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| 52 | |||
| 53 | @Override
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| 54 | public boolean removeSymbolTable(SymbolTable symbolTable) { |
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| 55 | throw new UnsupportedOperationException("Not supported yet."); |
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| 56 | } |
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| 57 | |||
| 58 | @Override
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| 59 | 44009 | jjdelcerro | public Function function(String name) { |
| 60 | return this.symbolTable.function(name); |
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| 61 | } |
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| 62 | |||
| 63 | @Override
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| 64 | public boolean exists(String name) { |
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| 65 | return false; |
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| 66 | } |
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| 67 | |||
| 68 | @Override
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| 69 | public Object value(String name) { |
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| 70 | return null; |
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| 71 | } |
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| 72 | |||
| 73 | @Override
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| 74 | 44205 | jjdelcerro | public boolean isSQLCompatible(String name) { |
| 75 | return false; |
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| 76 | } |
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| 77 | |||
| 78 | @Override
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| 79 | 44009 | jjdelcerro | public Collection<String> variables() { |
| 80 | return Collections.EMPTY_LIST; |
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| 81 | } |
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| 82 | |||
| 83 | @Override
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| 84 | public Collection<Function> functions() { |
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| 85 | return this.symbolTable.functions(); |
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| 86 | } |
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| 87 | |||
| 88 | @Override
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| 89 | public Collection<Script> scripts() { |
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| 90 | return this.symbolTable.scripts(); |
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| 91 | } |
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| 92 | |||
| 93 | @Override
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| 94 | @SuppressWarnings("CloneDoesntCallSuperClone") |
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| 95 | public SymbolTable clone() throws CloneNotSupportedException { |
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| 96 | throw new UnsupportedOperationException("Not supported yet."); |
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| 97 | } |
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| 98 | |||
| 99 | @Override
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| 100 | public Iterator<Function> iterator() { |
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| 101 | return this.symbolTable.iterator(); |
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| 102 | } |
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| 103 | |||
| 104 | } |
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| 105 | |||
| 106 | private final OptimizerSymbolTable symbolTable; |
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| 107 | private Interpreter interpreter;
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| 108 | private CodeBuilder codeBuilder;
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| 109 | 44010 | jjdelcerro | |
| 110 | 44009 | jjdelcerro | public DefaultOptimizer() {
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| 111 | this.symbolTable = new OptimizerSymbolTable(); |
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| 112 | } |
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| 113 | |||
| 114 | public DefaultOptimizer(SymbolTable symbolTable) {
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| 115 | this();
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| 116 | this.symbolTable.setSymbolTable(symbolTable);
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| 117 | } |
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| 118 | |||
| 119 | @Override
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| 120 | public void setSymbolTable(SymbolTable symbolTable) { |
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| 121 | this.symbolTable.setSymbolTable(symbolTable);
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| 122 | } |
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| 123 | |||
| 124 | 44010 | jjdelcerro | @Override
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| 125 | public SymbolTable getSymbolTable() {
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| 126 | return this.symbolTable; |
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| 127 | } |
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| 128 | |||
| 129 | @Override
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| 130 | public Interpreter getInterpreter() {
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| 131 | if (this.interpreter == null) { |
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| 132 | 44009 | jjdelcerro | this.interpreter = new DefaultInterpreter(); |
| 133 | this.interpreter.setSymbolTable(this.symbolTable); |
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| 134 | } |
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| 135 | return this.interpreter; |
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| 136 | } |
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| 137 | 44010 | jjdelcerro | |
| 138 | @Override
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| 139 | public CodeBuilder getCodeBuilder() {
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| 140 | if (this.codeBuilder == null) { |
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| 141 | 44009 | jjdelcerro | this.codeBuilder = new DefaultCodeBuilder(); |
| 142 | } |
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| 143 | return this.codeBuilder; |
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| 144 | } |
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| 145 | 44010 | jjdelcerro | |
| 146 | 44009 | jjdelcerro | @Override
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| 147 | 44019 | jjdelcerro | public Code optimize(SymbolTable symbolTable, Code code) {
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| 148 | this.setSymbolTable(symbolTable);
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| 149 | return this.optimize(code); |
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| 150 | } |
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| 151 | |||
| 152 | @Override
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| 153 | 44009 | jjdelcerro | public Code optimize(Code code) {
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| 154 | code = this.doOptimize(code);
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| 155 | return code;
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| 156 | } |
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| 157 | 44010 | jjdelcerro | |
| 158 | 44009 | jjdelcerro | private Code doOptimize(Code code) {
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| 159 | switch (code.code()) {
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| 160 | case Code.CALLER:
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| 161 | Caller caller = (Caller) code; |
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| 162 | 44010 | jjdelcerro | if (caller.function() == null) { |
| 163 | // resolve and link function
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| 164 | caller.function(this.getSymbolTable().function(caller.name()));
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| 165 | } |
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| 166 | if (caller.function() instanceof FunctionOptimizer) { |
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| 167 | return ((FunctionOptimizer) caller.function()).optimize(this, caller); |
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| 168 | } else {
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| 169 | switch (caller.type()) {
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| 170 | case Caller.BINARY_OPERATOR: {
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| 171 | 44198 | jjdelcerro | Code op1 = this.doOptimize(caller.parameters().get(0)); |
| 172 | Code op2 = this.doOptimize(caller.parameters().get(1)); |
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| 173 | 44010 | jjdelcerro | if (caller.function().allowConstantFolding()) {
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| 174 | if (op1.code() == Code.CONSTANT && op2.code() == Code.CONSTANT) {
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| 175 | Object value = this.getInterpreter().run(code); |
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| 176 | Code newCode = this.getCodeBuilder().constant(value);
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| 177 | return newCode;
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| 178 | } |
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| 179 | Code newCode = this.getCodeBuilder().operator(caller.name(), op1, op2);
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| 180 | return newCode;
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| 181 | } |
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| 182 | 44009 | jjdelcerro | } |
| 183 | 44010 | jjdelcerro | |
| 184 | case Code.Caller.UNARY_OPERATOR: {
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| 185 | 44198 | jjdelcerro | Code op1 = this.doOptimize(caller.parameters().get(0)); |
| 186 | 44010 | jjdelcerro | if (caller.function().allowConstantFolding()
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| 187 | && op1.code() == Code.CONSTANT) {
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| 188 | Object value = this.getInterpreter().run(code); |
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| 189 | Code newCode = this.getCodeBuilder().constant(value);
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| 190 | return newCode;
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| 191 | } |
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| 192 | return code;
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| 193 | 44009 | jjdelcerro | } |
| 194 | |||
| 195 | 44010 | jjdelcerro | case Code.Caller.FUNCTION:
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| 196 | default: {
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| 197 | 44139 | jjdelcerro | BaseCodes newArgs = null;
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| 198 | 44010 | jjdelcerro | boolean canOptimize = true; |
| 199 | 44198 | jjdelcerro | if (caller.parameters() != null) { |
| 200 | 44139 | jjdelcerro | newArgs = (BaseCodes) this.getCodeBuilder().args();
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| 201 | 44198 | jjdelcerro | for (Code arg : caller.parameters()) {
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| 202 | 44010 | jjdelcerro | Code newArg = this.doOptimize(arg);
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| 203 | newArgs.add(newArg); |
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| 204 | if (newArg.code() != Code.CONSTANT) {
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| 205 | canOptimize = false;
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| 206 | } |
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| 207 | 44009 | jjdelcerro | } |
| 208 | } |
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| 209 | 44010 | jjdelcerro | if (canOptimize && caller.function().allowConstantFolding()) {
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| 210 | Object value = this.getInterpreter().run(code); |
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| 211 | Code newCode = this.getCodeBuilder().constant(value);
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| 212 | return newCode;
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| 213 | } |
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| 214 | Code newCode = this.getCodeBuilder().function(
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| 215 | caller.name(), |
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| 216 | caller.type(), |
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| 217 | newArgs |
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| 218 | ); |
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| 219 | 44009 | jjdelcerro | return newCode;
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| 220 | } |
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| 221 | } |
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| 222 | } |
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| 223 | 44010 | jjdelcerro | |
| 224 | 44009 | jjdelcerro | case Code.CONSTANT:
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| 225 | case Code.IDENTIFIER:
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| 226 | case Code.METHOD:
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| 227 | default:
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| 228 | return code;
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| 229 | } |
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| 230 | } |
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| 231 | } |