com.vaadin.server.ComponentSizeValidator Maven / Gradle / Ivy
/*
* Copyright (C) 2000-2024 Vaadin Ltd
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See for the full
* license.
*/
package com.vaadin.server;
import java.io.PrintStream;
import java.io.Serializable;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.vaadin.server.Sizeable.Unit;
import com.vaadin.ui.AbstractOrderedLayout;
import com.vaadin.ui.AbstractSplitPanel;
import com.vaadin.ui.Component;
import com.vaadin.ui.ComponentContainer;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.GridLayout;
import com.vaadin.ui.GridLayout.Area;
import com.vaadin.ui.HasComponents;
import com.vaadin.ui.Panel;
import com.vaadin.ui.TabSheet;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;
@SuppressWarnings({ "serial", "deprecation" })
public class ComponentSizeValidator implements Serializable {
private static final int LAYERS_SHOWN = 4;
/**
* Recursively checks given component and its subtree for invalid layout
* setups. Prints errors to std err stream.
*
* @param component
* component to check
* @return set of first level errors found
*/
public static List validateComponentRelativeSizes(
Component component, List errors,
InvalidLayout parent) {
if (component != null) {
boolean invalidHeight = !checkHeights(component);
boolean invalidWidth = !checkWidths(component);
if (invalidHeight || invalidWidth) {
InvalidLayout error = new InvalidLayout(component,
invalidHeight, invalidWidth);
if (parent != null) {
parent.addError(error);
} else {
if (errors == null) {
errors = new LinkedList<>();
}
errors.add(error);
}
parent = error;
}
}
if (component instanceof Panel) {
Panel panel = (Panel) component;
errors = validateComponentRelativeSizes(panel.getContent(), errors,
parent);
} else if (component instanceof ComponentContainer) {
ComponentContainer lo = (ComponentContainer) component;
Iterator it = lo.getComponentIterator();
while (it.hasNext()) {
errors = validateComponentRelativeSizes(it.next(), errors,
parent);
}
} else if (isForm(component)) {
HasComponents form = (HasComponents) component;
for (Component child : form) {
errors = validateComponentRelativeSizes(child, errors, parent);
}
}
return errors;
}
/**
* Comparability form component which is defined in the different jar.
*
* TODO : Normally this logic shouldn't be here. But it means that the whole
* this class has wrong design and implementation and should be refactored.
*/
private static boolean isForm(Component component) {
if (!(component instanceof HasComponents)) {
return false;
}
Class clazz = component.getClass();
while (clazz != null) {
if (component.getClass().getName()
.equals("com.vaadin.v7.ui.Form")) {
return true;
}
clazz = clazz.getSuperclass();
}
return false;
}
private static void printServerError(String msg,
Deque attributes, boolean widthError,
PrintStream errorStream) {
StringBuilder err = new StringBuilder();
err.append("Vaadin DEBUG\n");
StringBuilder indent = new StringBuilder();
ComponentInfo ci;
if (attributes != null) {
while (attributes.size() > LAYERS_SHOWN) {
attributes.pop();
}
while (!attributes.isEmpty()) {
ci = attributes.pop();
showComponent(ci.component, ci.info, err, indent, widthError);
}
}
err.append("Layout problem detected: ");
err.append(msg);
err.append("\n");
err.append(
"Relative sizes were replaced by undefined sizes, components may not render as expected.\n");
errorStream.println(err);
}
public static boolean checkHeights(Component component) {
try {
if (!hasRelativeHeight(component)) {
return true;
}
if (component instanceof Window) {
return true;
}
if (component.getParent() == null) {
return true;
}
return parentCanDefineHeight(component);
} catch (Exception e) {
getLogger().log(Level.FINER,
"An exception occurred while validating sizes.", e);
return true;
}
}
public static boolean checkWidths(Component component) {
try {
if (!hasRelativeWidth(component)) {
return true;
}
if (component instanceof Window) {
return true;
}
if (component.getParent() == null) {
return true;
}
return parentCanDefineWidth(component);
} catch (Exception e) {
getLogger().log(Level.FINER,
"An exception occurred while validating sizes.", e);
return true;
}
}
public static class InvalidLayout implements Serializable {
private final Component component;
private final boolean invalidHeight;
private final boolean invalidWidth;
private final List subErrors = new ArrayList<>();
public InvalidLayout(Component component, boolean height,
boolean width) {
this.component = component;
invalidHeight = height;
invalidWidth = width;
}
public void addError(InvalidLayout error) {
subErrors.add(error);
}
public void reportErrors(StringBuilder clientJSON,
PrintStream serverErrorStream) {
clientJSON.append('{');
Component parent = component.getParent();
String paintableId = component.getConnectorId();
clientJSON.append("\"id\":\"").append(paintableId).append("\"");
if (invalidHeight) {
Deque attributes = null;
String msg = "";
// set proper error messages
if (parent instanceof AbstractOrderedLayout) {
AbstractOrderedLayout ol = (AbstractOrderedLayout) parent;
boolean vertical = false;
if (ol instanceof VerticalLayout) {
vertical = true;
}
if (vertical) {
msg = "Component with relative height inside a VerticalLayout with no height defined.";
attributes = getHeightAttributes(component);
} else {
msg = "At least one of a HorizontalLayout's components must have non relative height if the height of the layout is not defined";
attributes = getHeightAttributes(component);
}
} else if (parent instanceof GridLayout) {
msg = "At least one of the GridLayout's components in each row should have non relative height if the height of the layout is not defined.";
attributes = getHeightAttributes(component);
} else {
// default error for non sized parent issue
msg = "A component with relative height needs a parent with defined height.";
attributes = getHeightAttributes(component);
}
printServerError(msg, attributes, false, serverErrorStream);
clientJSON.append(",\"heightMsg\":\"").append(msg).append("\"");
}
if (invalidWidth) {
Deque attributes = null;
String msg = "";
if (parent instanceof AbstractOrderedLayout) {
AbstractOrderedLayout ol = (AbstractOrderedLayout) parent;
boolean horizontal = true;
if (ol instanceof VerticalLayout) {
horizontal = false;
}
if (horizontal) {
msg = "Component with relative width inside a HorizontalLayout with no width defined";
attributes = getWidthAttributes(component);
} else {
msg = "At least one of a VerticalLayout's components must have non relative width if the width of the layout is not defined";
attributes = getWidthAttributes(component);
}
} else if (parent instanceof GridLayout) {
msg = "At least one of the GridLayout's components in each column should have non relative width if the width of the layout is not defined.";
attributes = getWidthAttributes(component);
} else {
// default error for non sized parent issue
msg = "A component with relative width needs a parent with defined width.";
attributes = getWidthAttributes(component);
}
clientJSON.append(",\"widthMsg\":\"").append(msg).append("\"");
printServerError(msg, attributes, true, serverErrorStream);
}
if (!subErrors.isEmpty()) {
serverErrorStream.println("Sub errors >>");
clientJSON.append(", \"subErrors\" : [");
boolean first = true;
for (InvalidLayout subError : subErrors) {
if (!first) {
clientJSON.append(',');
} else {
first = false;
}
subError.reportErrors(clientJSON, serverErrorStream);
}
clientJSON.append(']');
serverErrorStream.println("<< Sub erros");
}
clientJSON.append('}');
}
}
private static class ComponentInfo implements Serializable {
Component component;
String info;
public ComponentInfo(Component component, String info) {
this.component = component;
this.info = info;
}
}
private static Deque getHeightAttributes(
Component component) {
Deque attributes = new ArrayDeque<>();
attributes
.add(new ComponentInfo(component, getHeightString(component)));
Component parent = component.getParent();
attributes.add(new ComponentInfo(parent, getHeightString(parent)));
while ((parent = parent.getParent()) != null) {
attributes.add(new ComponentInfo(parent, getHeightString(parent)));
}
return attributes;
}
private static Deque getWidthAttributes(
Component component) {
final Deque attributes = new ArrayDeque<>();
attributes.add(new ComponentInfo(component, getWidthString(component)));
Component parent = component.getParent();
attributes.add(new ComponentInfo(parent, getWidthString(parent)));
while ((parent = parent.getParent()) != null) {
attributes.add(new ComponentInfo(parent, getWidthString(parent)));
}
return attributes;
}
private static String getWidthString(Component component) {
String width = "width: ";
if (hasRelativeWidth(component)) {
width += "RELATIVE, " + component.getWidth() + " %";
} else if (component instanceof Window
&& component.getParent() == null) {
width += "MAIN WINDOW";
} else if (component.getWidth() >= 0) {
width += "ABSOLUTE, " + component.getWidth() + " "
+ component.getWidthUnits().getSymbol();
} else {
width += "UNDEFINED";
}
return width;
}
private static String getHeightString(Component component) {
String height = "height: ";
if (hasRelativeHeight(component)) {
height += "RELATIVE, " + component.getHeight() + " %";
} else if (component instanceof Window
&& component.getParent() == null) {
height += "MAIN WINDOW";
} else if (component.getHeight() > 0) {
height += "ABSOLUTE, " + component.getHeight() + " "
+ component.getHeightUnits().getSymbol();
} else {
height += "UNDEFINED";
}
return height;
}
private static void showComponent(Component component, String attribute,
StringBuilder err, StringBuilder indent, boolean widthError) {
FileLocation createLoc = CREATION_LOCATIONS.get(component);
FileLocation sizeLoc;
if (widthError) {
sizeLoc = WIDTH_LOCATIONS.get(component);
} else {
sizeLoc = HEIGHT_LOCATIONS.get(component);
}
err.append(indent);
indent.append(" ");
err.append("- ");
err.append(component.getClass().getSimpleName());
err.append('/').append(Integer.toHexString(component.hashCode()));
if (component.getCaption() != null) {
err.append(" \"");
err.append(component.getCaption());
err.append("\"");
}
if (component.getId() != null) {
err.append(" id: ");
err.append(component.getId());
}
if (createLoc != null) {
err.append(", created at (").append(createLoc.file).append(':')
.append(createLoc.lineNumber).append(')');
}
if (attribute != null) {
err.append(" (");
err.append(attribute);
if (sizeLoc != null) {
err.append(", set at (").append(sizeLoc.file).append(':')
.append(sizeLoc.lineNumber).append(')');
}
err.append(')');
}
err.append("\n");
}
private static boolean hasNonRelativeHeightComponent(
AbstractOrderedLayout ol) {
Iterator it = ol.getComponentIterator();
while (it.hasNext()) {
if (!hasRelativeHeight(it.next())) {
return true;
}
}
return false;
}
public static boolean parentCanDefineHeight(Component component) {
Component parent = component.getParent();
if (parent == null) {
// main window
return true;
}
if (parent.getHeight() < 0) {
// Undefined height
if (parent instanceof Window) {
// Sub window with undefined size has a min-height
return true;
}
if (parent instanceof AbstractOrderedLayout) {
if (parent instanceof VerticalLayout) {
return false;
}
return hasNonRelativeHeightComponent(
(AbstractOrderedLayout) parent);
} else if (parent instanceof GridLayout) {
GridLayout gl = (GridLayout) parent;
Area componentArea = gl.getComponentArea(component);
for (int row = componentArea.getRow1(); row <= componentArea
.getRow2(); row++) {
for (int column = 0; column < gl.getColumns(); column++) {
Component c = gl.getComponent(column, row);
if (c != null) {
if (!hasRelativeHeight(c)) {
return true;
}
}
}
}
return false;
} else if (isForm(parent)) {
/*
* If some other part of the form is not relative it determines
* the component width
*/
return formHasNonRelativeWidthComponent(parent);
}
if (parent instanceof Panel || parent instanceof AbstractSplitPanel
|| parent instanceof TabSheet
|| parent instanceof CustomComponent) {
// height undefined, we know how how component works and no
// exceptions
// TODO horiz SplitPanel ??
return false;
} else {
// We cannot generally know if undefined component can serve
// space for children (like CustomLayout or component built by
// third party) so we assume they can
return true;
}
} else if (hasRelativeHeight(parent)) {
// Relative height
if (parent.getParent() != null) {
return parentCanDefineHeight(parent);
}
return true;
} else {
// Absolute height
return true;
}
}
/**
* Comparability form component which is defined in the different jar.
*
* TODO : Normally this logic shouldn't be here. But it means that the whole
* this class has wrong design and implementation and should be refactored.
*/
private static boolean formHasNonRelativeWidthComponent(Component form) {
HasComponents parent = (HasComponents) form;
for (Component aParent : parent) {
if (!hasRelativeWidth(aParent)) {
return true;
}
}
return false;
}
private static boolean hasRelativeHeight(Component component) {
return (component.getHeightUnits() == Unit.PERCENTAGE
&& component.getHeight() > 0);
}
private static boolean hasNonRelativeWidthComponent(
AbstractOrderedLayout ol) {
Iterator it = ol.getComponentIterator();
while (it.hasNext()) {
if (!hasRelativeWidth(it.next())) {
return true;
}
}
return false;
}
private static boolean hasRelativeWidth(Component paintable) {
return paintable.getWidth() > 0
&& paintable.getWidthUnits() == Unit.PERCENTAGE;
}
public static boolean parentCanDefineWidth(Component component) {
Component parent = component.getParent();
if (parent == null) {
// main window
return true;
}
if (parent instanceof Window) {
// Sub window with undefined size has a min-width
return true;
}
if (parent.getWidth() < 0) {
// Undefined width
if (parent instanceof AbstractOrderedLayout) {
AbstractOrderedLayout ol = (AbstractOrderedLayout) parent;
// VerticalLayout and a child defines height
return ol instanceof VerticalLayout
&& hasNonRelativeWidthComponent(ol);
} else if (parent instanceof GridLayout) {
GridLayout gl = (GridLayout) parent;
Area componentArea = gl.getComponentArea(component);
for (int col = componentArea.getColumn1(); col <= componentArea
.getColumn2(); col++) {
for (int row = 0; row < gl.getRows(); row++) {
Component c = gl.getComponent(col, row);
if (c != null) {
if (!hasRelativeWidth(c)) {
return true;
}
}
}
}
return false;
} else if (parent instanceof AbstractSplitPanel
|| parent instanceof TabSheet
|| parent instanceof CustomComponent) {
// FIXME Could we use com.vaadin package name here and
// fail for all component containers?
// FIXME Actually this should be moved to containers so it can
// be implemented for custom containers
// TODO vertical splitpanel with another non relative component?
return false;
} else if (parent instanceof Window) {
// Sub window can define width based on caption
return parent.getCaption() != null
&& !parent.getCaption().isEmpty();
}
// TODO Panel should be able to define width based on caption
return !(parent instanceof Panel);
} else if (hasRelativeWidth(parent)) {
// Relative width
if (parent.getParent() == null) {
return true;
}
return parentCanDefineWidth(parent);
} else {
return true;
}
}
private static final Map CREATION_LOCATIONS = new HashMap<>();
private static final Map WIDTH_LOCATIONS = new HashMap<>();
private static final Map HEIGHT_LOCATIONS = new HashMap<>();
public static class FileLocation implements Serializable {
public String method;
public String file;
public String className;
public String classNameSimple;
public int lineNumber;
public FileLocation(StackTraceElement traceElement) {
file = traceElement.getFileName();
className = traceElement.getClassName();
classNameSimple = className
.substring(className.lastIndexOf('.') + 1);
lineNumber = traceElement.getLineNumber();
method = traceElement.getMethodName();
}
}
public static void setCreationLocation(Object object) {
setLocation(CREATION_LOCATIONS, object);
}
public static void setWidthLocation(Object object) {
setLocation(WIDTH_LOCATIONS, object);
}
public static void setHeightLocation(Object object) {
setLocation(HEIGHT_LOCATIONS, object);
}
private static void setLocation(Map map,
Object object) {
StackTraceElement[] traceLines = Thread.currentThread().getStackTrace();
for (StackTraceElement traceElement : traceLines) {
Class cls;
try {
String className = traceElement.getClassName();
if (className.startsWith("java.")
|| className.startsWith("sun.")) {
continue;
}
cls = Class.forName(className);
if (cls == ComponentSizeValidator.class
|| cls == Thread.class) {
continue;
}
if (Component.class.isAssignableFrom(cls)
&& !CustomComponent.class.isAssignableFrom(cls)) {
continue;
}
FileLocation cl = new FileLocation(traceElement);
map.put(object, cl);
return;
} catch (Exception e) {
getLogger().log(Level.FINER,
"An exception occurred while validating sizes.", e);
}
}
}
private static Logger getLogger() {
return Logger.getLogger(ComponentSizeValidator.class.getName());
}
/**
* Validates the layout and returns a collection of errors.
*
* @since 7.1
* @param ui
* The UI to validate
* @return A collection of errors. An empty collection if there are no
* errors.
*/
public static List validateLayouts(UI ui) {
List invalidRelativeSizes = ComponentSizeValidator
.validateComponentRelativeSizes(ui.getContent(),
new ArrayList<>(), null);
// Also check any existing subwindows
if (ui.getWindows() != null) {
for (Window subWindow : ui.getWindows()) {
invalidRelativeSizes = ComponentSizeValidator
.validateComponentRelativeSizes(subWindow.getContent(),
invalidRelativeSizes, null);
}
}
return invalidRelativeSizes;
}
private ComponentSizeValidator() {
}
}
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