nestabledelegate.java

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package net.sf.hibernate.exception;

import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.Serializable;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * <p>A shared implementation of the nestable exception functionality.</p>
 * <p>
 * The code is shared between 
 * {@link org.apache.commons.lang.exception.NestableError NestableError},
 * {@link org.apache.commons.lang.exception.NestableException NestableException} and
 * {@link org.apache.commons.lang.exception.NestableRuntimeException NestableRuntimeException}.
 * </p>
 * 
 * @author <a href="mailto:[e-mail]">Rafal Krzewski</a>
 * @author <a href="mailto:[e-mail]">Daniel Rall</a>
 * @author <a href="mailto:[e-mail]">Kasper Nielsen</a>
 * @author <a href="mailto:[e-mail]">Steven Caswell</a>
 * @author Sean C. Sullivan
 * @author Stephen Colebourne
 * @since 1.0
 * @version $Id: NestableDelegate.java,v 1.1.2.3 2003/10/28 03:19:53 oneovthafew Exp $
 */
public class NestableDelegate implements Serializable {

    /**
     * Constructor error message.
     */
    private static final String MUST_BE_THROWABLE =
        "The Nestable implementation passed to the NestableDelegate(Nestable) "
            + "constructor must extend java.lang.Throwable";

    /**
     * Holds the reference to the exception or error that we're
     * wrapping (which must be a {@link
     * org.apache.commons.lang.exception.Nestable} implementation).
     */
    private Throwable nestable = null;
    
    /**
     * Whether to print the stack trace top-down.
     * This public flag may be set by calling code, typically in initialisation.
     * @since 2.0
     */
    private static boolean topDown = true;
    
    /**
     * Whether to trim the repeated stack trace.
     * This public flag may be set by calling code, typically in initialisation.
     * @since 2.0
     */
    private static boolean trimStackFrames = true;

    /**
     * Constructs a new <code>NestableDelegate</code> instance to manage the
     * specified <code>Nestable</code>.
     *
     * @param nestable the Nestable implementation (<i>must</i> extend
     * {@link java.lang.Throwable})
     * @since 2.0
     */
    public NestableDelegate(Nestable nestable) {
        if (nestable instanceof Throwable) {
            this.nestable = (Throwable) nestable;
        } 
        else {
            throw new IllegalArgumentException(MUST_BE_THROWABLE);
        }
    }

    /**
     * Returns the error message of the <code>Throwable</code> in the chain
     * of <code>Throwable</code>s at the specified index, numbererd from 0.
     *
     * @param index the index of the <code>Throwable</code> in the chain of
     * <code>Throwable</code>s
     * @return the error message, or null if the <code>Throwable</code> at the
     * specified index in the chain does not contain a message
     * @throws IndexOutOfBoundsException if the <code>index</code> argument is
     * negative or not less than the count of <code>Throwable</code>s in the
     * chain
     * @since 2.0
     */
    public String getMessage(int index) {
        Throwable t = this.getThrowable(index);
        if ( Nestable.class.isInstance(t) ) {
            return ( (Nestable) t ).getMessage(0);
        } 
        else {
            return t.getMessage();
        }
    }

    /**
     * Returns the full message contained by the <code>Nestable</code>
     * and any nested <code>Throwable</code>s.
     *
     * @param baseMsg the base message to use when creating the full
     * message. Should be generally be called via
     * <code>nestableHelper.getMessage( super.getMessage() )</code>,
     * where <code>super</code> is an instance of {@link
     * java.lang.Throwable}.
     * @return The concatenated message for this and all nested
     * <code>Throwable</code>s
     * @since 2.0
     */
    public String getMessage(String baseMsg) {
        StringBuffer msg = new StringBuffer();
        if (baseMsg != null) {
            msg.append(baseMsg);
        }

        Throwable nestedCause = ExceptionUtils.getCause(this.nestable);
        if (nestedCause != null) {
            String causeMsg = nestedCause.getMessage();
            if (causeMsg != null) {
                if (baseMsg != null) {
                    msg.append(": ");
                }
                msg.append(causeMsg);
            }

        }
        return (msg.length() > 0 ? msg.toString() : null);
    }

    /**
     * Returns the error message of this and any nested <code>Throwable</code>s
     * in an array of Strings, one element for each message. Any
     * <code>Throwable</code> not containing a message is represented in the
     * array by a null. This has the effect of cause the length of the returned
     * array to be equal to the result of the {@link #getThrowableCount()}
     * operation.
     *
     * @return the error messages
     * @since 2.0
     */
    public String[] getMessages() {
        Throwable[] throwables = this.getThrowables();
        String[] msgs = new String[throwables.length];
        for (int i = 0; i < throwables.length; i++) {
            msgs[i] = Nestable.class.isInstance(throwables[i]) ?
                    ( (Nestable) throwables[i] ).getMessage(0) :
                    throwables[i].getMessage();
        }
        return msgs;
    }