001/*
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 *  Copyright (C) 1999-2025, QOS.ch. All rights reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under
006 * either the terms of the Eclipse Public License v1.0 as published by
007 * the Eclipse Foundation
008 *
009 *     or (per the licensee's choosing)
010 *
011 * under the terms of the GNU Lesser General Public License version 2.1
012 * as published by the Free Software Foundation.
013 */
014
015package ch.qos.logback.core.model.processor.conditional;
016
017import ch.qos.logback.core.Context;
018import ch.qos.logback.core.boolex.PropertyCondition;
019import ch.qos.logback.core.model.Model;
020import ch.qos.logback.core.model.conditional.IfModel;
021import ch.qos.logback.core.model.conditional.ByPropertiesConditionModel;
022import ch.qos.logback.core.model.processor.ModelHandlerBase;
023import ch.qos.logback.core.model.processor.ModelHandlerException;
024import ch.qos.logback.core.model.processor.ModelInterpretationContext;
025import ch.qos.logback.core.util.OptionHelper;
026
027import static ch.qos.logback.core.model.conditional.IfModel.BranchState.ELSE_BRANCH;
028import static ch.qos.logback.core.model.conditional.IfModel.BranchState.IF_BRANCH;
029
030public class ByPropertiesConditionModelHandler extends ModelHandlerBase {
031
032    private boolean inError = false;
033    PropertyCondition propertyEvaluator;
034
035    public ByPropertiesConditionModelHandler(Context context) {
036        super(context);
037    }
038
039    @Override
040    protected Class<ByPropertiesConditionModel> getSupportedModelClass() {
041        return ByPropertiesConditionModel.class;
042    }
043
044    static public ModelHandlerBase makeInstance(Context context, ModelInterpretationContext mic) {
045        return new ByPropertiesConditionModelHandler(context);
046    }
047
048
049    @Override
050    public void handle(ModelInterpretationContext mic, Model model) throws ModelHandlerException {
051
052        ByPropertiesConditionModel byPropertiesConditionModel = (ByPropertiesConditionModel) model;
053        String className = byPropertiesConditionModel.getClassName();
054        if (OptionHelper.isNullOrEmptyOrAllSpaces(className)) {
055            addWarn("Missing className. This should have been caught earlier.");
056            inError = true;
057            return;
058        } else {
059            className = mic.getImport(className);
060        }
061        try {
062            addInfo("About to instantiate PropertyEvaluator of type [" + className + "]");
063
064            propertyEvaluator = (PropertyCondition) OptionHelper.instantiateByClassName(className,
065                    PropertyCondition.class, context);
066            propertyEvaluator.setContext(context);
067            propertyEvaluator.setLocalPropertyContainer(mic);
068            mic.pushObject(propertyEvaluator);
069        } catch (Exception e) {
070            inError = true;
071            mic.pushObject(IfModel.BranchState.IN_ERROR);
072            addError("Could not create a SequenceNumberGenerator of type [" + className + "].", e);
073            throw new ModelHandlerException(e);
074        }
075    }
076
077    public void postHandle(ModelInterpretationContext mic, Model model) throws ModelHandlerException {
078        if (inError) {
079            return;
080        }
081        Object o = mic.peekObject();
082        if (o != propertyEvaluator) {
083            addWarn("The object at the of the stack is not the propertyEvaluator instance pushed earlier.");
084        } else {
085            mic.popObject();
086        }
087
088        propertyEvaluator.start();
089        if(!propertyEvaluator.isStarted()) {
090            addError("PropertyEvaluator of type ["+propertyEvaluator.getClass().getName()+"] did not start successfully.");
091            mic.pushObject(IfModel.BranchState.IN_ERROR);
092            return;
093        }
094        boolean evaluationResult = propertyEvaluator.evaluate();
095        IfModel.BranchState branchState = evaluationResult ? IF_BRANCH : ELSE_BRANCH;
096        mic.pushObject(branchState);
097
098    }
099}