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 / DefaultExpression.java @ 45308
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package org.gvsig.expressionevaluator.impl; |
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import java.lang.ref.WeakReference; |
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import java.util.Objects; |
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import org.apache.commons.lang3.StringUtils; |
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import org.gvsig.expressionevaluator.Code; |
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import org.gvsig.expressionevaluator.Compiler; |
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import org.gvsig.expressionevaluator.Expression; |
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import org.gvsig.expressionevaluator.ExpressionEvaluatorLocator; |
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import org.gvsig.expressionevaluator.ExpressionEvaluatorManager; |
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import org.gvsig.expressionevaluator.ExpressionUtils; |
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import org.gvsig.expressionevaluator.Interpreter; |
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import org.gvsig.expressionevaluator.Optimizer; |
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import org.gvsig.expressionevaluator.SymbolTable; |
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import org.gvsig.tools.ToolsLocator; |
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import org.gvsig.tools.dynobject.DynStruct; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.gvsig.tools.persistence.PersistenceManager; |
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import org.gvsig.tools.persistence.PersistentState; |
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import org.gvsig.tools.persistence.exception.PersistenceException; |
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import org.gvsig.tools.script.ScriptManager; |
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import org.gvsig.tools.util.LabeledValue; |
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import org.json.JSONObject; |
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/**
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*
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* @author jjdelcerro
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*/
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public class DefaultExpression implements Expression, LabeledValue<Expression> { |
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private String phrase = null; |
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private Code code = null; |
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private Interpreter interpreter;
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private boolean hasNotBeenOptimized = true; |
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private SymbolTable mySymbolTable = null; |
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private WeakReference<SymbolTable> lastSymbolTable = null; |
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private boolean useBracketsForIdentifiers = false; |
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protected ExpressionEvaluatorManager manager;
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public DefaultExpression() {
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this(ExpressionEvaluatorLocator.getExpressionEvaluatorManager());
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} |
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public DefaultExpression(ExpressionEvaluatorManager manager) {
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this.manager = manager;
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} |
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@Override
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public String getLabel() { |
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return StringUtils.abbreviate(
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StringUtils.normalizeSpace(this.getPhrase()),
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35
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); |
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} |
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@Override
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public Expression getValue() { |
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return this; |
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} |
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@Override
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public boolean equals(Object obj) { |
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if( obj == null || !(obj instanceof Expression) ) { |
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return false; |
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} |
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String this_s = this.toJSON(); |
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String other_s = ((Expression)obj).toJSON(); |
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return this_s.equals(other_s);
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} |
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@Override
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public int hashCode() { |
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String this_s = this.toJSON(); |
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return Objects.hashCode(this_s);
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} |
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@Override
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public SymbolTable getSymbolTable() {
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if( this.mySymbolTable==null ) { |
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this.mySymbolTable = ExpressionUtils.createSymbolTable();
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} |
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return this.mySymbolTable; |
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} |
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@Override
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public String getPhrase() { |
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return this.phrase; |
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} |
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@Override
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public boolean isPhraseEmpty() { |
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return StringUtils.isBlank(this.phrase); |
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} |
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@Override
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public boolean isEmpty() { |
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if( !StringUtils.isBlank(this.phrase) ) { |
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return false; |
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} |
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return true; |
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} |
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@Override
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public Expression setPhrase(String phrase) { |
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this.phrase = phrase;
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this.code = null; |
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this.hasNotBeenOptimized = true; |
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return this; |
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} |
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@Override
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public void clear() { |
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this.phrase = null; |
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this.code = null; |
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this.interpreter = null; |
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this.hasNotBeenOptimized = true; |
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} |
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@Override
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public Code getCode() {
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if (this.code == null) { |
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Compiler compiler = this.manager.createCompiler(); |
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compiler.getLexicalAnalyzer().setUseBracketsForIdentifiers( |
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this.useBracketsForIdentifiers
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); |
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this.code = compiler.compileExpression(this.phrase); |
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} |
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return code;
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} |
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@Override
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public void setSQLCompatible(boolean sqlCompatible) { |
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this.getInterpreter().setSQLCompatible(sqlCompatible);
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} |
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@Override
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public boolean isSQLCompatible() { |
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return this.getInterpreter().isSQLCompatible(); |
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} |
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private Interpreter getInterpreter() {
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if (this.interpreter == null) { |
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this.interpreter = this.manager.createInterpreter(); |
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} |
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return this.interpreter; |
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} |
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@Override
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public Object execute(SymbolTable symbolTable) { |
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if (this.interpreter == null) { |
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this.interpreter = this.manager.createInterpreter(); |
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} |
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boolean added = false; |
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if( symbolTable!=null ) { |
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added = this.getSymbolTable().addSymbolTable(symbolTable);
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if( this.lastSymbolTable==null ) { |
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this.lastSymbolTable = new WeakReference<>(symbolTable); |
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} else if( this.lastSymbolTable.get()!=symbolTable ) { |
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this.link(this.getSymbolTable()); |
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this.hasNotBeenOptimized = true; |
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} |
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} |
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try {
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this.interpreter.setSymbolTable(this.getSymbolTable()); |
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if( this.hasNotBeenOptimized ) { |
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try {
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Optimizer optimizer = this.manager.createOptimizer();
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optimizer.setSymbolTable(this.getSymbolTable());
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this.code = optimizer.optimize(this.getCode()); |
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} catch(Throwable th) { |
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// Si no es capaz de optimizar la expresion no, peta y la
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// ejecuta tal cual.
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} |
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this.hasNotBeenOptimized = false; |
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} |
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Object x = this.interpreter.run(this.getCode()); |
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return x;
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} finally {
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if( added ) {
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this.getSymbolTable().removeSymbolTable(symbolTable);
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} |
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} |
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} |
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@Override
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public void link(SymbolTable symbolTable) { |
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if (this.interpreter == null) { |
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this.interpreter = this.manager.createInterpreter(); |
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} |
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this.lastSymbolTable = new WeakReference<>(symbolTable); |
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this.interpreter.setSymbolTable(symbolTable);
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if( this.hasNotBeenOptimized ) { |
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Optimizer optimizer = new DefaultOptimizer(this.manager, symbolTable); |
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this.code = optimizer.optimize(this.getCode()); |
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this.hasNotBeenOptimized = false; |
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} |
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this.interpreter.link(this.getCode()); |
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} |
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@Override
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public void saveToState(PersistentState state) throws PersistenceException { |
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state.set("phrase", this.phrase); |
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// if (this.userScript == null) {
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// state.setNull("userScript_code");
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// state.setNull("userScript_language");
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// } else {
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// state.set("userScript_code", this.userScript.getCode());
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// state.set("userScript_language", this.userScript.getTypeName());
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// }
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// if (this.scripts != null && !this.scripts.isEmpty()) {
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// List<URL> l = new ArrayList<>();
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// for (Script script : this.scripts) {
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// URL location = script.getURL();
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// if (location != null) {
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// l.add(location);
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// }
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// }
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// if (l.isEmpty()) {
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// state.setNull("scripts");
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// } else {
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// state.set("scripts", l);
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// }
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// } else {
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// state.setNull("scripts");
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// }
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} |
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@Override
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public void loadFromState(PersistentState state) throws PersistenceException { |
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ScriptManager scriptManager = ToolsLocator.getScriptManager(); |
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this.clear();
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this.phrase = state.getString("phrase"); |
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// String userScript_code = state.getString("userScript_code");
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// String userScript_language = state.getString("userScript_language");
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// if (StringUtils.isEmpty(userScript_code)) {
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// this.userScript = null;
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// } else {
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// if (StringUtils.isEmpty(userScript_language)) {
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// userScript_language = "python";
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// }
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// this.userScript = scriptManager.createScript("user", userScript_code, userScript_language);
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// }
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// Iterator scriptsLocations = state.getIterator("scripts");
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// if (scriptsLocations != null) {
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// while (scriptsLocations.hasNext()) {
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// URI location = (URI) scriptsLocations.next();
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// Script script = scriptManager.loadScript(location);
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// if (script != null) {
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// if (this.scripts == null) {
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// this.scripts = new ArrayList<>();
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// }
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// this.scripts.add(script);
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// }
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// }
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// }
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} |
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public static void registerPersistence() { |
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PersistenceManager manager = ToolsLocator.getPersistenceManager(); |
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if (manager.getDefinition("Expression") == null) { |
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DynStruct definition = manager.addDefinition(DefaultExpression.class, |
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"Expression", "Expression persistence definition", null, null); |
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definition.addDynFieldString("phrase").setMandatory(false); |
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// definition.addDynFieldString("userScript_code").setMandatory(false);
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// definition.addDynFieldString("userScript_language").setMandatory(false);
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// definition.addDynFieldList("scripts")
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// .setClassOfItems(URL.class)
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// .setMandatory(false);
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} |
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} |
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@Override
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public String toJSON() { |
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JSONObject expressionJson = new JSONObject();
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expressionJson.put("phrase", this.phrase); |
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// if (this.userScript != null) {
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// JSONObject userScriptJson = new JSONObject();
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// userScriptJson.put("code", this.userScript.getCode());
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// userScriptJson.put("language", this.userScript.getTypeName());
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// expressionJson.put("userScript", userScriptJson);
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// }
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//
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// if (this.scripts != null && !this.scripts.isEmpty()) {
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// JSONArray scriptsJson = new JSONArray();
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// for (Script script : this.scripts) {
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// scriptsJson.put(script.getURL());
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// }
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// expressionJson.put("scripts", scriptsJson);
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// }
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return expressionJson.toString();
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} |
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@Override
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public void fromJSON(String json) { |
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this.clear();
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ScriptManager scriptMananger = ToolsLocator.getScriptManager(); |
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JSONObject expressionJson = new JSONObject(json);
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if (expressionJson.has("phrase")) { |
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this.phrase = expressionJson.getString("phrase"); |
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} |
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// if (expressionJson.has("userScript")) {
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// String theCode = "";
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// String theLanguage = "python";
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// JSONObject userScriptJson = expressionJson.getJSONObject("userScript");
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// if (userScriptJson.has("code")) {
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// theCode = userScriptJson.getString("code");
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// }
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// if (userScriptJson.has("language")) {
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// theCode = userScriptJson.getString("language");
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// }
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// this.userScript = scriptMananger.createScript("user", theCode, theLanguage);
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// }
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// if (expressionJson.has("scripts")) {
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// this.scripts = new ArrayList<>();
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// JSONArray scriptsJson = expressionJson.getJSONArray("scripts");
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// for (Object object : scriptsJson) {
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// URI location = (URI) object;
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// Script script = scriptMananger.loadScript(location);
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// this.scripts.add(script);
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// }
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// }
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} |
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@Override
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public String toString() { |
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return this.toJSON(); |
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} |
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@Override
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public Expression clone() throws CloneNotSupportedException { |
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Expression other = (Expression) super.clone(); |
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other.fromJSON(this.toJSON());
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return other;
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} |
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@Override
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public void setUseBracketsForIdentifiers(boolean useBracketsForIdentifiers) { |
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this.useBracketsForIdentifiers = useBracketsForIdentifiers;
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} |
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@Override
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public boolean getUseBracketsForIdentifiers() { |
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return this.useBracketsForIdentifiers; |
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} |
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@Override
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public Evaluator toEvaluator() {
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DefaultExpressionEvaluator evaluator = new DefaultExpressionEvaluator(this); |
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return evaluator;
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} |
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} |