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+/*
+@ITMillApache2LicenseForJavaFiles@
+ */
+
+package com.vaadin.ui;
+
+import java.lang.reflect.Method;
+
+import com.vaadin.data.Property;
+import com.vaadin.data.util.ObjectProperty;
+import com.vaadin.terminal.PaintException;
+import com.vaadin.terminal.PaintTarget;
+
+/**
+ * Label component for showing non-editable short texts.
+ *
+ * The label content can be set to the modes specified by the final members
+ * CONTENT_*
+ *
+ * <p>
+ * The contents of the label may contain simple formatting:
+ * <ul>
+ * <li><b>&lt;b></b> Bold
+ * <li><b>&lt;i></b> Italic
+ * <li><b>&lt;u></b> Underlined
+ * <li><b>&lt;br/></b> Linebreak
+ * <li><b>&lt;ul>&lt;li>item 1&lt;/li>&lt;li>item 2&lt;/li>&lt;/ul></b> List of
+ * items
+ * </ul>
+ * The <b>b</b>,<b>i</b>,<b>u</b> and <b>li</b> tags can contain all the tags in
+ * the list recursively.
+ * </p>
+ *
+ * @author IT Mill Ltd.
+ * @version
+ * @VERSION@
+ * @since 3.0
+ */
+@SuppressWarnings("serial")
+public class Label extends AbstractComponent implements Property,
+ Property.Viewer, Property.ValueChangeListener,
+ Property.ValueChangeNotifier, Comparable {
+
+ /**
+ * Content mode, where the label contains only plain text. The getValue()
+ * result is coded to XML when painting.
+ */
+ public static final int CONTENT_TEXT = 0;
+
+ /**
+ * Content mode, where the label contains preformatted text.
+ */
+ public static final int CONTENT_PREFORMATTED = 1;
+
+ /**
+ * Formatted content mode, where the contents is XML restricted to the UIDL
+ * 1.0 formatting markups.
+ *
+ * @deprecated Use CONTENT_XML instead.
+ */
+ @Deprecated
+ public static final int CONTENT_UIDL = 2;
+
+ /**
+ * Content mode, where the label contains XHTML. Contents is then enclosed
+ * in DIV elements having namespace of
+ * "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd".
+ */
+ public static final int CONTENT_XHTML = 3;
+
+ /**
+ * Content mode, where the label contains well-formed or well-balanced XML.
+ * Each of the root elements must have their default namespace specified.
+ */
+ public static final int CONTENT_XML = 4;
+
+ /**
+ * Content mode, where the label contains RAW output. Output is not required
+ * to comply to with XML. In Web Adapter output is inserted inside the
+ * resulting HTML document as-is. This is useful for some specific purposes
+ * where possibly broken HTML content needs to be shown, but in most cases
+ * XHTML mode should be preferred.
+ */
+ public static final int CONTENT_RAW = 5;
+
+ /**
+ * The default content mode is plain text.
+ */
+ public static final int CONTENT_DEFAULT = CONTENT_TEXT;
+
+ /** Array of content mode names that are rendered in UIDL as mode attribute. */
+ private static final String[] CONTENT_MODE_NAME = { "text", "pre", "uidl",
+ "xhtml", "xml", "raw" };
+
+ private static final String DATASOURCE_MUST_BE_SET = "Datasource must be set";
+
+ private Property dataSource;
+
+ private int contentMode = CONTENT_DEFAULT;
+
+ /**
+ * Creates an empty Label.
+ */
+ public Label() {
+ this("");
+ }
+
+ /**
+ * Creates a new instance of Label with text-contents.
+ *
+ * @param content
+ */
+ public Label(String content) {
+ this(content, CONTENT_DEFAULT);
+ }
+
+ /**
+ * Creates a new instance of Label with text-contents read from given
+ * datasource.
+ *
+ * @param contentSource
+ */
+ public Label(Property contentSource) {
+ this(contentSource, CONTENT_DEFAULT);
+ }
+
+ /**
+ * Creates a new instance of Label with text-contents.
+ *
+ * @param content
+ * @param contentMode
+ */
+ public Label(String content, int contentMode) {
+ this(new ObjectProperty(content, String.class), contentMode);
+ }
+
+ /**
+ * Creates a new instance of Label with text-contents read from given
+ * datasource.
+ *
+ * @param contentSource
+ * @param contentMode
+ */
+ public Label(Property contentSource, int contentMode) {
+ setPropertyDataSource(contentSource);
+ if (contentMode != CONTENT_DEFAULT) {
+ setContentMode(contentMode);
+ }
+ setWidth(100, UNITS_PERCENTAGE);
+ }
+
+ /**
+ * Get the component UIDL tag.
+ *
+ * @return the Component UIDL tag as string.
+ */
+ @Override
+ public String getTag() {
+ return "label";
+ }
+
+ /**
+ * Set the component to read-only. Readonly is not used in label.
+ *
+ * @param readOnly
+ * True to enable read-only mode, False to disable it.
+ */
+ @Override
+ public void setReadOnly(boolean readOnly) {
+ if (dataSource == null) {
+ throw new IllegalStateException(DATASOURCE_MUST_BE_SET);
+ }
+ dataSource.setReadOnly(readOnly);
+ }
+
+ /**
+ * Is the component read-only ? Readonly is not used in label - this returns
+ * allways false.
+ *
+ * @return <code>true</code> if the component is in read only mode.
+ */
+ @Override
+ public boolean isReadOnly() {
+ if (dataSource == null) {
+ throw new IllegalStateException(DATASOURCE_MUST_BE_SET);
+ }
+ return dataSource.isReadOnly();
+ }
+
+ /**
+ * Paints the content of this component.
+ *
+ * @param target
+ * the Paint Event.
+ * @throws PaintException
+ * if the Paint Operation fails.
+ */
+ @Override
+ public void paintContent(PaintTarget target) throws PaintException {
+ if (contentMode != CONTENT_TEXT) {
+ target.addAttribute("mode", CONTENT_MODE_NAME[contentMode]);
+ }
+ if (contentMode == CONTENT_TEXT) {
+ target.addText(toString());
+ } else if (contentMode == CONTENT_UIDL) {
+ target.addUIDL(toString());
+ } else if (contentMode == CONTENT_XHTML) {
+ target.startTag("data");
+ target.addXMLSection("div", toString(),
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd");
+ target.endTag("data");
+ } else if (contentMode == CONTENT_PREFORMATTED) {
+ target.startTag("pre");
+ target.addText(toString());
+ target.endTag("pre");
+ } else if (contentMode == CONTENT_XML) {
+ target.addXMLSection("data", toString(), null);
+ } else if (contentMode == CONTENT_RAW) {
+ target.startTag("data");
+ target.addAttribute("escape", false);
+ target.addText(toString());
+ target.endTag("data");
+ }
+
+ }
+
+ /**
+ * Gets the value of the label. Value of the label is the XML contents of
+ * the label.
+ *
+ * @return the Value of the label.
+ */
+ public Object getValue() {
+ if (dataSource == null) {
+ throw new IllegalStateException(DATASOURCE_MUST_BE_SET);
+ }
+ return dataSource.getValue();
+ }
+
+ /**
+ * Set the value of the label. Value of the label is the XML contents of the
+ * label.
+ *
+ * @param newValue
+ * the New value of the label.
+ */
+ public void setValue(Object newValue) {
+ if (dataSource == null) {
+ throw new IllegalStateException(DATASOURCE_MUST_BE_SET);
+ }
+ dataSource.setValue(newValue);
+ }
+
+ /**
+ * @see java.lang.Object#toString()
+ */
+ @Override
+ public String toString() {
+ if (dataSource == null) {
+ throw new IllegalStateException(DATASOURCE_MUST_BE_SET);
+ }
+ return dataSource.toString();
+ }
+
+ /**
+ * Gets the type of the Property.
+ *
+ * @see com.vaadin.data.Property#getType()
+ */
+ public Class getType() {
+ if (dataSource == null) {
+ throw new IllegalStateException(DATASOURCE_MUST_BE_SET);
+ }
+ return dataSource.getType();
+ }
+
+ /**
+ * Gets the viewing data-source property.
+ *
+ * @return the data source property.
+ * @see com.vaadin.data.Property.Viewer#getPropertyDataSource()
+ */
+ public Property getPropertyDataSource() {
+ return dataSource;
+ }
+
+ /**
+ * Sets the property as data-source for viewing.
+ *
+ * @param newDataSource
+ * the new data source Property
+ * @see com.vaadin.data.Property.Viewer#setPropertyDataSource(com.vaadin.data.Property)
+ */
+ public void setPropertyDataSource(Property newDataSource) {
+ // Stops listening the old data source changes
+ if (dataSource != null
+ && Property.ValueChangeNotifier.class
+ .isAssignableFrom(dataSource.getClass())) {
+ ((Property.ValueChangeNotifier) dataSource).removeListener(this);
+ }
+
+ // Sets the new data source
+ dataSource = newDataSource;
+
+ // Listens the new data source if possible
+ if (dataSource != null
+ && Property.ValueChangeNotifier.class
+ .isAssignableFrom(dataSource.getClass())) {
+ ((Property.ValueChangeNotifier) dataSource).addListener(this);
+ }
+ }
+
+ /**
+ * Gets the content mode of the Label.
+ *
+ * <p>
+ * Possible content modes include:
+ * <ul>
+ * <li><b>CONTENT_TEXT</b> Content mode, where the label contains only plain
+ * text. The getValue() result is coded to XML when painting.</li>
+ * <li><b>CONTENT_PREFORMATTED</b> Content mode, where the label contains
+ * preformatted text.</li>
+ * <li><b>CONTENT_UIDL</b> Formatted content mode, where the contents is XML
+ * restricted to the UIDL 1.0 formatting markups.</li>
+ * <li><b>CONTENT_XHTML</b> Content mode, where the label contains XHTML.
+ * Contents is then enclosed in DIV elements having namespace of
+ * "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd".</li>
+ * <li><b>CONTENT_XML</b> Content mode, where the label contains well-formed
+ * or well-balanced XML. Each of the root elements must have their default
+ * namespace specified.</li>
+ * <li><b>CONTENT_RAW</b> Content mode, where the label contains RAW output.
+ * Output is not required to comply to with XML. In Web Adapter output is
+ * inserted inside the resulting HTML document as-is. This is useful for
+ * some specific purposes where possibly broken HTML content needs to be
+ * shown, but in most cases XHTML mode should be preferred.</li>
+ * </ul>
+ * </p>
+ *
+ * @return the Content mode of the label.
+ */
+ public int getContentMode() {
+ return contentMode;
+ }
+
+ /**
+ * Sets the content mode of the Label.
+ *
+ * <p>
+ * Possible content modes include:
+ * <ul>
+ * <li><b>CONTENT_TEXT</b> Content mode, where the label contains only plain
+ * text. The getValue() result is coded to XML when painting.</li>
+ * <li><b>CONTENT_PREFORMATTED</b> Content mode, where the label contains
+ * preformatted text.</li>
+ * <li><b>CONTENT_UIDL</b> Formatted content mode, where the contents is XML
+ * restricted to the UIDL 1.0 formatting markups.</li>
+ * <li><b>CONTENT_XHTML</b> Content mode, where the label contains XHTML.
+ * Contents is then enclosed in DIV elements having namespace of
+ * "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd".</li>
+ * <li><b>CONTENT_XML</b> Content mode, where the label contains well-formed
+ * or well-balanced XML. Each of the root elements must have their default
+ * namespace specified.</li>
+ * <li><b>CONTENT_RAW</b> Content mode, where the label contains RAW output.
+ * Output is not required to comply to with XML. In Web Adapter output is
+ * inserted inside the resulting HTML document as-is. This is useful for
+ * some specific purposes where possibly broken HTML content needs to be
+ * shown, but in most cases XHTML mode should be preferred.</li>
+ * </ul>
+ * </p>
+ *
+ * @param contentMode
+ * the New content mode of the label.
+ */
+ public void setContentMode(int contentMode) {
+ if (contentMode != this.contentMode && contentMode >= CONTENT_TEXT
+ && contentMode <= CONTENT_RAW) {
+ this.contentMode = contentMode;
+ requestRepaint();
+ }
+ }
+
+ /* Value change events */
+
+ private static final Method VALUE_CHANGE_METHOD;
+
+ static {
+ try {
+ VALUE_CHANGE_METHOD = Property.ValueChangeListener.class
+ .getDeclaredMethod("valueChange",
+ new Class[] { Property.ValueChangeEvent.class });
+ } catch (final java.lang.NoSuchMethodException e) {
+ // This should never happen
+ throw new java.lang.RuntimeException(
+ "Internal error finding methods in Label");
+ }
+ }
+
+ /**
+ * Value change event
+ *
+ * @author IT Mill Ltd.
+ * @version
+ * @VERSION@
+ * @since 3.0
+ */
+ public class ValueChangeEvent extends Component.Event implements
+ Property.ValueChangeEvent {
+
+ /**
+ * New instance of text change event
+ *
+ * @param source
+ * the Source of the event.
+ */
+ public ValueChangeEvent(Label source) {
+ super(source);
+ }
+
+ /**
+ * Gets the Property that has been modified.
+ *
+ * @see com.vaadin.data.Property.ValueChangeEvent#getProperty()
+ */
+ public Property getProperty() {
+ return (Property) getSource();
+ }
+ }
+
+ /**
+ * Adds the value change listener.
+ *
+ * @param listener
+ * the Listener to be added.
+ * @see com.vaadin.data.Property.ValueChangeNotifier#addListener(com.vaadin.data.Property.ValueChangeListener)
+ */
+ public void addListener(Property.ValueChangeListener listener) {
+ addListener(Label.ValueChangeEvent.class, listener, VALUE_CHANGE_METHOD);
+ }
+
+ /**
+ * Removes the value change listener.
+ *
+ * @param listener
+ * the Listener to be removed.
+ * @see com.vaadin.data.Property.ValueChangeNotifier#removeListener(com.vaadin.data.Property.ValueChangeListener)
+ */
+ public void removeListener(Property.ValueChangeListener listener) {
+ removeListener(Label.ValueChangeEvent.class, listener,
+ VALUE_CHANGE_METHOD);
+ }
+
+ /**
+ * Emits the options change event.
+ */
+ protected void fireValueChange() {
+ // Set the error message
+ fireEvent(new Label.ValueChangeEvent(this));
+ requestRepaint();
+ }
+
+ /**
+ * Listens the value change events from data source.
+ *
+ * @see com.vaadin.data.Property.ValueChangeListener#valueChange(Property.ValueChangeEvent)
+ */
+ public void valueChange(Property.ValueChangeEvent event) {
+ fireValueChange();
+ }
+
+ /**
+ * Compares the Label to other objects.
+ *
+ * <p>
+ * Labels can be compared to other labels for sorting label contents. This
+ * is especially handy for sorting table columns.
+ * </p>
+ *
+ * <p>
+ * In RAW, PREFORMATTED and TEXT modes, the label contents are compared as
+ * is. In XML, UIDL and XHTML modes, only CDATA is compared and tags
+ * ignored. If the other object is not a Label, its toString() return value
+ * is used in comparison.
+ * </p>
+ *
+ * @param other
+ * the Other object to compare to.
+ * @return a negative integer, zero, or a positive integer as this object is
+ * less than, equal to, or greater than the specified object.
+ * @see java.lang.Comparable#compareTo(java.lang.Object)
+ */
+ public int compareTo(Object other) {
+
+ String thisValue;
+ String otherValue;
+
+ if (contentMode == CONTENT_XML || contentMode == CONTENT_UIDL
+ || contentMode == CONTENT_XHTML) {
+ thisValue = stripTags(toString());
+ } else {
+ thisValue = toString();
+ }
+
+ if (other instanceof Label
+ && (((Label) other).getContentMode() == CONTENT_XML
+ || ((Label) other).getContentMode() == CONTENT_UIDL || ((Label) other)
+ .getContentMode() == CONTENT_XHTML)) {
+ otherValue = stripTags(other.toString());
+ } else {
+ otherValue = other.toString();
+ }
+
+ return thisValue.compareTo(otherValue);
+ }
+
+ /**
+ * Strips the tags from the XML.
+ *
+ * @param xml
+ * the String containing a XML snippet.
+ * @return the original XML without tags.
+ */
+ private String stripTags(String xml) {
+
+ final StringBuffer res = new StringBuffer();
+
+ int processed = 0;
+ final int xmlLen = xml.length();
+ while (processed < xmlLen) {
+ int next = xml.indexOf('<', processed);
+ if (next < 0) {
+ next = xmlLen;
+ }
+ res.append(xml.substring(processed, next));
+ if (processed < xmlLen) {
+ next = xml.indexOf('>', processed);
+ if (next < 0) {
+ next = xmlLen;
+ }
+ processed = next + 1;
+ }
+ }
+
+ return res.toString();
+ }
+
+}