Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.spi;

import ch.qos.logback.core.CoreConstants;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class ThrowableProxy implements IThrowableProxy {

    private Throwable throwable;
    private String className;
    private String message;
    // package-private because of ThrowableProxyUtil
    StackTraceElementProxy[] stackTraceElementProxyArray;
    // package-private because of ThrowableProxyUtil
    int commonFrames;
    private ThrowableProxy cause;
    private ThrowableProxy[] suppressed = NO_SUPPRESSED;

    private transient PackagingDataCalculator packagingDataCalculator;
    private boolean calculatedPackageData = false;

    private static final Method GET_SUPPRESSED_METHOD;

    static {
        Method method = null;
        try {
            method = Throwable.class.getMethod("getSuppressed");
        } catch (NoSuchMethodException e) {
            // ignore, will get thrown in Java < 7
        }
        GET_SUPPRESSED_METHOD = method;
    }

    private static final ThrowableProxy[] NO_SUPPRESSED = new ThrowableProxy[0];

    public ThrowableProxy(Throwable throwable) {

        this.throwable = throwable;
        this.className = throwable.getClass().getName();
        this.message = throwable.getMessage();
        this.stackTraceElementProxyArray = ThrowableProxyUtil.steArrayToStepArray(throwable.getStackTrace());

        Throwable nested = throwable.getCause();

        if (nested != null) {
            this.cause = new ThrowableProxy(nested);
            this.cause.commonFrames = ThrowableProxyUtil.findNumberOfCommonFrames(nested.getStackTrace(), stackTraceElementProxyArray);
        }
        if (GET_SUPPRESSED_METHOD != null) {
            // this will only execute on Java 7
            try {
                Object obj = GET_SUPPRESSED_METHOD.invoke(throwable);
                if (obj instanceof Throwable[]) {
                    Throwable[] throwableSuppressed = (Throwable[]) obj;
                    if (throwableSuppressed.length > 0) {
                        suppressed = new ThrowableProxy[throwableSuppressed.length];
                        for (int i = 0; i < throwableSuppressed.length; i++) {
                            this.suppressed[i] = new ThrowableProxy(throwableSuppressed[i]);
                            this.suppressed[i].commonFrames = ThrowableProxyUtil.findNumberOfCommonFrames(throwableSuppressed[i].getStackTrace(),
                                            stackTraceElementProxyArray);
                        }
                    }
                }
            } catch (IllegalAccessException e) {
                // ignore
            } catch (InvocationTargetException e) {
                // ignore
            }
        }

    }

    public Throwable getThrowable() {
        return throwable;
    }

    public String getMessage() {
        return message;
    }

    /*
     * (non-Javadoc)
     * 
     * @see ch.qos.logback.classic.spi.IThrowableProxy#getClassName()
     */
    public String getClassName() {
        return className;
    }

    public StackTraceElementProxy[] getStackTraceElementProxyArray() {
        return stackTraceElementProxyArray;
    }

    public int getCommonFrames() {
        return commonFrames;
    }

    /*
     * (non-Javadoc)
     * 
     * @see ch.qos.logback.classic.spi.IThrowableProxy#getCause()
     */
    public IThrowableProxy getCause() {
        return cause;
    }

    public IThrowableProxy[] getSuppressed() {
        return suppressed;
    }

    public PackagingDataCalculator getPackagingDataCalculator() {
        // if original instance (non-deserialized), and packagingDataCalculator
        // is not already initialized, then create an instance.
        // here we assume that (throwable == null) for deserialized instances
        if (throwable != null && packagingDataCalculator == null) {
            packagingDataCalculator = new PackagingDataCalculator();
        }
        return packagingDataCalculator;
    }

    public void calculatePackagingData() {
        if (calculatedPackageData) {
            return;
        }
        PackagingDataCalculator pdc = this.getPackagingDataCalculator();
        if (pdc != null) {
            calculatedPackageData = true;
            pdc.calculate(this);
        }
    }

    public void fullDump() {
        StringBuilder builder = new StringBuilder();
        for (StackTraceElementProxy step : stackTraceElementProxyArray) {
            String string = step.toString();
            builder.append(CoreConstants.TAB).append(string);
            ThrowableProxyUtil.subjoinPackagingData(builder, step);
            builder.append(CoreConstants.LINE_SEPARATOR);
        }
        System.out.println(builder.toString());
    }

}