001/*
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2026, 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 v2.0 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    static final String EVALUTATOR_IS_IN_ERROR_MSG0 = "The [if] statement will be marked IN_ERROR and none of its branches will be executed.";
033    static final String EVALUTATOR_IS_IN_ERROR_MSG1 = "The [if] statement will be marked IN_ERROR and none of its branches will be executed.";
034
035
036    private boolean inError = false;
037    PropertyCondition propertyEvaluator;
038
039    public ByPropertiesConditionModelHandler(Context context) {
040        super(context);
041    }
042
043    @Override
044    protected Class<ByPropertiesConditionModel> getSupportedModelClass() {
045        return ByPropertiesConditionModel.class;
046    }
047
048    static public ModelHandlerBase makeInstance(Context context, ModelInterpretationContext mic) {
049        return new ByPropertiesConditionModelHandler(context);
050    }
051
052
053    @Override
054    public void handle(ModelInterpretationContext mic, Model model) throws ModelHandlerException {
055
056        ByPropertiesConditionModel byPropertiesConditionModel = (ByPropertiesConditionModel) model;
057        String className = byPropertiesConditionModel.getClassName();
058        if (OptionHelper.isNullOrEmptyOrAllSpaces(className)) {
059            addWarn("Missing className. This should have been caught earlier.");
060            inError = true;
061            return;
062        } else {
063            className = mic.getImport(className);
064        }
065        try {
066            addInfo("About to instantiate PropertyEvaluator of type [" + className + "]");
067
068            propertyEvaluator = (PropertyCondition) OptionHelper.instantiateByClassName(className,
069                    PropertyCondition.class, context);
070            propertyEvaluator.setContext(context);
071            propertyEvaluator.setLocalPropertyContainer(mic);
072            mic.pushObject(propertyEvaluator);
073        } catch (Exception e) {
074            inError = true;
075            mic.pushObject(IfModel.BranchState.IN_ERROR);
076            addError("Could not create a SequenceNumberGenerator of type [" + className + "].", e);
077            throw new ModelHandlerException(e);
078        }
079    }
080
081    public void postHandle(ModelInterpretationContext mic, Model model) throws ModelHandlerException {
082        if (inError) {
083            return;
084        }
085        Object o = mic.peekObject();
086        if (o != propertyEvaluator) {
087            addWarn("The object at the of the stack is not the propertyEvaluator instance pushed earlier.");
088        } else {
089            mic.popObject();
090        }
091
092        propertyEvaluator.start();
093        if(!propertyEvaluator.isStarted()) {
094            addError("PropertyEvaluator of type ["+propertyEvaluator.getClass().getName()+"] did not start successfully.");
095            addError(EVALUTATOR_IS_IN_ERROR_MSG0);
096            mic.pushObject(IfModel.BranchState.IN_ERROR);
097            return;
098        }
099        boolean evaluationResult = propertyEvaluator.evaluate();
100        IfModel.BranchState branchState = evaluationResult ? IF_BRANCH : ELSE_BRANCH;
101        mic.pushObject(branchState);
102
103    }
104}