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/*******************************************************************************
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* Copyright (c) 2000, 2007 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package eu.etaxonomy.cdm.common.monitor;
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/**
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* For new implementations consider using {@link SubMonitor}.
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*
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* A progress monitor that uses a given amount of work ticks
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* from a parent monitor. It can be used as follows:
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* <pre>
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* try {
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* pm.beginTask("Main Task", 100);
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* doSomeWork(pm, 30);
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* SubProgressMonitor subMonitor= new SubProgressMonitor(pm, 40);
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* try {
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* subMonitor.beginTask("", 300);
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* doSomeWork(subMonitor, 300);
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* } finally {
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* subMonitor.done();
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* }
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* doSomeWork(pm, 30);
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* } finally {
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* pm.done();
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* }
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* </pre>
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* <p>
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* This class can be used without OSGi running.
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* </p><p>
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* This class may be instantiated or subclassed by clients.
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* </p>
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*
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* @see SubMonitor
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*/
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public class SubProgressMonitor extends ProgressMonitorWrapper {
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private static final long serialVersionUID = 3258788051657003998L;
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/**
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* Style constant indicating that calls to <code>subTask</code>
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* should not have any effect.
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*
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* @see #SubProgressMonitor(IProgressMonitor,int,int)
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*/
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public static final int SUPPRESS_SUBTASK_LABEL = 1 << 1;
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/**
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* Style constant indicating that the main task label
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* should be prepended to the subtask label.
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*
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* @see #SubProgressMonitor(IProgressMonitor,int,int)
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*/
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public static final int PREPEND_MAIN_LABEL_TO_SUBTASK = 1 << 2;
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private int parentTicks = 0;
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private double sentToParent = 0.0;
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private double scale = 0.0;
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private int nestedBeginTasks = 0;
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private boolean usedUp = false;
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private boolean hasSubTask = false;
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private int style;
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private String mainTaskLabel;
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/**
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* Creates a new sub-progress monitor for the given monitor. The sub
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* progress monitor uses the given number of work ticks from its
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* parent monitor.
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*
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* @param monitor the parent progress monitor
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* @param ticks the number of work ticks allocated from the
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* parent monitor
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*/
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public SubProgressMonitor(IProgressMonitor monitor, int ticks) {
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this (monitor, ticks, 0);
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}
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/**
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* Creates a new sub-progress monitor for the given monitor. The sub
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* progress monitor uses the given number of work ticks from its
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* parent monitor.
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*
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* @param monitor the parent progress monitor
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* @param ticks the number of work ticks allocated from the
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* parent monitor
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* @param style one of
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* <ul>
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* <li> <code>SUPPRESS_SUBTASK_LABEL</code> </li>
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* <li> <code>PREPEND_MAIN_LABEL_TO_SUBTASK</code> </li>
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* </ul>
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* @see #SUPPRESS_SUBTASK_LABEL
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* @see #PREPEND_MAIN_LABEL_TO_SUBTASK
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*/
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public SubProgressMonitor(IProgressMonitor monitor, int ticks,
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int style) {
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super (monitor);
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this .parentTicks = (ticks > 0) ? ticks : 0;
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this .style = style;
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}
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/* (Intentionally not javadoc'd)
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* Implements the method <code>IProgressMonitor.beginTask</code>.
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*
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* Starts a new main task. Since this progress monitor is a sub
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* progress monitor, the given name will NOT be used to update
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* the progress bar's main task label. That means the given
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* string will be ignored. If style <code>PREPEND_MAIN_LABEL_TO_SUBTASK
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* <code> is specified, then the given string will be prepended to
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* every string passed to <code>subTask(String)</code>.
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*/
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@Override
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public void beginTask(String name, int totalWork) {
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nestedBeginTasks++;
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// Ignore nested begin task calls.
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if (nestedBeginTasks > 1) {
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return;
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}
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// be safe: if the argument would cause math errors (zero or
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// negative), just use 0 as the scale. This disables progress for
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// this submonitor.
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scale = totalWork <= 0 ? 0 : (double) parentTicks
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/ (double) totalWork;
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if ((style & PREPEND_MAIN_LABEL_TO_SUBTASK) != 0) {
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mainTaskLabel = name;
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}
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}
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@Override
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public void done() {
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// Ignore if more done calls than beginTask calls or if we are still
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// in some nested beginTasks
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if (nestedBeginTasks == 0 || --nestedBeginTasks > 0) {
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return;
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}
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// Send any remaining ticks and clear out the subtask text
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double remaining = parentTicks - sentToParent;
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if (remaining > 0) {
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super.internalWorked(remaining);
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}
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//clear the sub task if there was one
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if (hasSubTask)
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{
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subTask(""); //$NON-NLS-1$
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}
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sentToParent = 0;
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}
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@Override
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public void internalWorked(double work) {
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if (usedUp || nestedBeginTasks != 1) {
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return;
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}
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double realWork = (work > 0.0d) ? scale * work : 0.0d;
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super.internalWorked(realWork);
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sentToParent += realWork;
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if (sentToParent >= parentTicks) {
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usedUp = true;
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}
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}
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@Override
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public void subTask(String name) {
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if ((style & SUPPRESS_SUBTASK_LABEL) != 0) {
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return;
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}
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hasSubTask = true;
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String label = name;
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if ((style & PREPEND_MAIN_LABEL_TO_SUBTASK) != 0
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&& mainTaskLabel != null && mainTaskLabel.length() > 0) {
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label = mainTaskLabel + ' ' + label;
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}
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super.subTask(label);
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}
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@Override
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public void worked(int work) {
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internalWorked(work);
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}
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@Override
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public void warning(String message) {
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// TODO Auto-generated method stub
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}
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@Override
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public void warning(String message, Throwable throwable) {
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// TODO Auto-generated method stub
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}
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}
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