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package org.apache.commons.scxml.env.jsp; |
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import java.lang.reflect.Method; |
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import java.util.Set; |
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import java.util.regex.Pattern; |
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import javax.servlet.jsp.el.ELException; |
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import javax.servlet.jsp.el.ExpressionEvaluator; |
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import javax.servlet.jsp.el.FunctionMapper; |
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import javax.servlet.jsp.el.VariableResolver; |
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import org.apache.commons.el.ExpressionEvaluatorImpl; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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import org.apache.commons.scxml.Builtin; |
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import org.apache.commons.scxml.Context; |
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import org.apache.commons.scxml.Evaluator; |
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import org.apache.commons.scxml.SCXMLExpressionException; |
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import org.w3c.dom.Node; |
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public class ELEvaluator implements Evaluator { |
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private Log log = LogFactory.getLog(Evaluator.class); |
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private FunctionMapper builtinFnMapper = new BuiltinFunctionMapper(); |
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private FunctionMapper fnMapper; |
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private static Pattern inFct = Pattern.compile("In\\("); |
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private static Pattern dataFct = Pattern.compile("Data\\("); |
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private ExpressionEvaluator ee = null; |
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public ELEvaluator() { |
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ee = new ExpressionEvaluatorImpl(); |
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} |
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public ELEvaluator(final FunctionMapper fnMapper) { |
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ee = new ExpressionEvaluatorImpl(); |
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this.fnMapper = fnMapper; |
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} |
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public Object eval(final Context ctx, final String expr) |
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throws SCXMLExpressionException { |
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if (expr == null) { |
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return null; |
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} |
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VariableResolver vr = null; |
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if (ctx instanceof VariableResolver) { |
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vr = (VariableResolver) ctx; |
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} else { |
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vr = new ContextWrapper(ctx); |
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} |
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try { |
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String evalExpr = inFct.matcher(expr). |
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replaceAll("In(_ALL_STATES, "); |
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Object rslt = ee.evaluate(evalExpr, Object.class, vr, |
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builtinFnMapper); |
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if (log.isTraceEnabled()) { |
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log.trace(expr + " = " + String.valueOf(rslt)); |
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} |
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return rslt; |
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} catch (ELException e) { |
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throw new SCXMLExpressionException(e); |
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} |
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} |
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public Boolean evalCond(final Context ctx, final String expr) |
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throws SCXMLExpressionException { |
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if (expr == null) { |
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return null; |
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} |
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VariableResolver vr = null; |
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if (ctx instanceof VariableResolver) { |
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vr = (VariableResolver) ctx; |
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} else { |
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vr = new ContextWrapper(ctx); |
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} |
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try { |
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String evalExpr = inFct.matcher(expr). |
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replaceAll("In(_ALL_STATES, "); |
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Boolean rslt = (Boolean) ee.evaluate(evalExpr, Boolean.class, |
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vr, builtinFnMapper); |
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if (log.isDebugEnabled()) { |
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log.debug(expr + " = " + String.valueOf(rslt)); |
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} |
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return rslt; |
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} catch (ELException e) { |
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throw new SCXMLExpressionException(e); |
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} |
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} |
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public Node evalLocation(final Context ctx, final String expr) |
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throws SCXMLExpressionException { |
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if (expr == null) { |
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return null; |
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} |
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VariableResolver vr = null; |
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if (ctx instanceof VariableResolver) { |
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vr = (VariableResolver) ctx; |
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} else { |
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vr = new ContextWrapper(ctx); |
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} |
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try { |
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String evalExpr = inFct.matcher(expr). |
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replaceAll("In(_ALL_STATES, "); |
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evalExpr = dataFct.matcher(evalExpr). |
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replaceFirst("LData("); |
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Node rslt = (Node) ee.evaluate(evalExpr, Node.class, |
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vr, builtinFnMapper); |
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if (log.isDebugEnabled()) { |
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log.debug(expr + " = " + String.valueOf(rslt)); |
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} |
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return rslt; |
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} catch (ELException e) { |
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throw new SCXMLExpressionException(e); |
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} |
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} |
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public Context newContext(final Context parent) { |
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return new ELContext(parent); |
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} |
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protected void setLog(final Log log) { |
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this.log = log; |
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} |
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protected Log getLog() { |
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return log; |
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} |
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static class ContextWrapper implements VariableResolver { |
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private Context ctx = null; |
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private Log log = LogFactory.getLog(ContextWrapper.class); |
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ContextWrapper(final Context ctx) { |
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this.ctx = ctx; |
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} |
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public Object resolveVariable(final String pName) throws ELException { |
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Object rslt = ctx.get(pName); |
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if (rslt == null) { |
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log.info("Variable \"" + pName + "\" does not exist!"); |
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} |
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return rslt; |
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} |
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} |
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class BuiltinFunctionMapper implements FunctionMapper { |
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private Log log = LogFactory.getLog(BuiltinFunctionMapper.class); |
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public Method resolveFunction(final String prefix, |
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final String localName) { |
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if (localName.equals("In")) { |
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Class[] attrs = new Class[] {Set.class, String.class}; |
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try { |
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return Builtin.class.getMethod("isMember", attrs); |
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} catch (SecurityException e) { |
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log.error("resolving isMember(Set, String)", e); |
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} catch (NoSuchMethodException e) { |
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log.error("resolving isMember(Set, String)", e); |
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} |
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} else if (localName.equals("Data")) { |
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Class[] attrs = new Class[] {Object.class, String.class}; |
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try { |
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return Builtin.class.getMethod("data", attrs); |
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} catch (SecurityException e) { |
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log.error("resolving data(Node, String)", e); |
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} catch (NoSuchMethodException e) { |
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log.error("resolving data(Node, String)", e); |
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} |
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} else if (localName.equals("LData")) { |
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Class[] attrs = new Class[] {Object.class, String.class}; |
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try { |
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return Builtin.class.getMethod("dataNode", attrs); |
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} catch (SecurityException e) { |
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log.error("resolving data(Node, String)", e); |
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} catch (NoSuchMethodException e) { |
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log.error("resolving data(Node, String)", e); |
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} |
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} else if (fnMapper != null) { |
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return fnMapper.resolveFunction(prefix, localName); |
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} |
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return null; |
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} |
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} |
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protected FunctionMapper getBuiltinFnMapper() { |
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return builtinFnMapper; |
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} |
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} |
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