/*
* *************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
* *************************************************************************************
*/
package com.espertech.esper.epl.declexpr;
import com.espertech.esper.epl.expression.ExprValidationException;
import com.espertech.esper.epl.spec.CreateExpressionDesc;
import com.espertech.esper.epl.spec.ExpressionDeclItem;
import com.espertech.esper.epl.spec.ExpressionScriptProvided;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class ExprDeclaredServiceImpl implements ExprDeclaredService {
private final Map<String, ExpressionDeclItem> globalExpressions;
private final Map<String, List<ExpressionScriptProvided>> globalScripts;
public ExprDeclaredServiceImpl() {
this.globalExpressions = new HashMap<String, ExpressionDeclItem>();
this.globalScripts = new HashMap<String, List<ExpressionScriptProvided>>();
}
public synchronized String addExpressionOrScript(CreateExpressionDesc expressionDesc) throws ExprValidationException {
if (expressionDesc.getExpression() != null) {
ExpressionDeclItem expression = expressionDesc.getExpression();
String name = expression.getName();
if (globalExpressions.containsKey(name)) {
throw new ExprValidationException("Expression '" + name + "' has already been declared");
}
globalExpressions.put(name, expression);
return name;
}
else {
ExpressionScriptProvided newScript = expressionDesc.getScript();
String name = newScript.getName();
List<ExpressionScriptProvided> scripts = globalScripts.get(name);
if (scripts != null) {
for (ExpressionScriptProvided script : scripts) {
if (script.getParameterNames().size() == newScript.getParameterNames().size()) {
throw new ExprValidationException("Script '" + name + "' that takes the same number of parameters has already been declared");
}
}
}
else {
scripts = new ArrayList<ExpressionScriptProvided>(2);
globalScripts.put(name, scripts);
}
scripts.add(newScript);
return name;
}
}
public ExpressionDeclItem getExpression(String name) {
return globalExpressions.get(name);
}
public List<ExpressionScriptProvided> getScriptsByName(String name) {
return globalScripts.get(name);
}
public synchronized void destroyedExpression(CreateExpressionDesc expressionDesc) {
if (expressionDesc.getExpression() != null) {
globalExpressions.remove(expressionDesc.getExpression().getName());
}
else {
globalScripts.remove(expressionDesc.getScript().getName());
}
}
public void destroy() {
globalExpressions.clear();
}
}