Fix layout for Detect language transform apache#4444

Adapt dialog constructor method
Add support for MDI
Add basic documentation

docs/hop-user-manual/modules/ROOT/pages/pipeline/transforms.adoc

@@ -74,6 +74,7 @@ The pages nested under this topic contain information on how to use the transfor
 * xref:pipeline/transforms/delete.adoc[Delete]
 * xref:pipeline/transforms/serialize-de-from-file.adoc[De-Serialize From File]
 * xref:pipeline/transforms/detectemptystream.adoc[Detect Empty Stream]
+* xref:pipeline/transforms/detectlanguage.adoc[Detect Language]
 * xref:pipeline/transforms/dimensionlookup.adoc[Dimension lookup/update]
 * xref:pipeline/transforms/dummy.adoc[Dummy (do nothing)]
 * xref:pipeline/transforms/dynamicsqlrow.adoc[Dynamic SQL row]

docs/hop-user-manual/modules/ROOT/pages/pipeline/transforms/detectlanguage.adoc

@@ -0,0 +1,49 @@
+////
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+  http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+////
+:documentationPath: /pipeline/transforms/
+:language: en_US
+:description: The Detect Empty Stream transform outputs one single empty row of data if the input stream is empty (ie when input stream does not contain any row). The output row will have the same field layout as the input row, but all field values will be empty (null).
+
+= image:transforms/icons/detect.svg[Detect Language transform Icon, role="image-doc-icon"] Detect Language
+
+[%noheader,cols="3a,1a", role="table-no-borders" ]
+|===
+|
+== Description
+
+The Detect Language transform examine text to identify the language.
+
+|
+== Supported Engines
+[%noheader,cols="2,1a",frame=none, role="table-supported-engines"]
+!===
+!Hop Engine! image:check_mark.svg[Supported, 24]
+!Spark! image:question_mark.svg[Maybe Supported, 24]
+!Flink! image:question_mark.svg[Maybe Supported, 24]
+!Dataflow! image:question_mark.svg[Maybe Supported, 24]
+!===
+|===
+
+== Options
+
+[options="header"]
+|===
+|Option|Description
+|Transform name|Name of the transform.
+This name must be unique throughout the pipeline.
+|===
+

plugins/transforms/detectlanguage/src/main/java/org/apache/hop/pipeline/transforms/language/DetectLanguageDialog.java

@@ -33,29 +33,26 @@
 import static org.eclipse.swt.SWT.SINGLE;
 import static org.eclipse.swt.SWT.Selection;
 
-import org.apache.hop.core.Const;
 import org.apache.hop.core.exception.HopException;
 import org.apache.hop.core.row.IRowMeta;
 import org.apache.hop.core.variables.IVariables;
 import org.apache.hop.pipeline.PipelineMeta;
-import org.apache.hop.pipeline.transform.BaseTransformMeta;
 import org.apache.hop.pipeline.transform.ITransformDialog;
 import org.apache.hop.ui.core.PropsUi;
 import org.apache.hop.ui.core.dialog.BaseDialog;
 import org.apache.hop.ui.core.dialog.ErrorDialog;
 import org.apache.hop.ui.pipeline.transform.BaseTransformDialog;
+import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CCombo;
 import org.eclipse.swt.events.FocusEvent;
 import org.eclipse.swt.events.FocusListener;
-import org.eclipse.swt.events.ModifyListener;
-import org.eclipse.swt.events.SelectionAdapter;
-import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Cursor;
 import org.eclipse.swt.layout.FormAttachment;
 import org.eclipse.swt.layout.FormData;
 import org.eclipse.swt.layout.FormLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Label;
+import org.eclipse.swt.widgets.Listener;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Text;
 
@@ -69,46 +66,49 @@ public class DetectLanguageDialog extends BaseTransformDialog implements ITransf
   private final DetectLanguageMeta input;
 
   public DetectLanguageDialog(
-      Shell parent, IVariables variables, Object in, PipelineMeta pipelineMeta, String sname) {
-    super(parent, variables, (BaseTransformMeta) in, pipelineMeta, sname);
-    input = (DetectLanguageMeta) in;
+      Shell parent,
+      IVariables variables,
+      DetectLanguageMeta transformMeta,
+      PipelineMeta pipelineMeta) {
+    super(parent, variables, transformMeta, pipelineMeta);
+    input = transformMeta;
   }
 
   @Override
   public String open() {
     Shell parent = getParent();
 
     shell = new Shell(parent, DIALOG_TRIM | RESIZE | MAX | MIN);
-    props.setLook(shell);
+    PropsUi.setLook(shell);
     setShellImage(shell, input);
 
-    ModifyListener lsMod = e -> input.setChanged();
+    Listener lsMod = e -> input.setChanged();
 
     changed = input.hasChanged();
 
     FormLayout formLayout = new FormLayout();
-    formLayout.marginWidth = Const.FORM_MARGIN;
-    formLayout.marginHeight = Const.FORM_MARGIN;
+    formLayout.marginWidth = PropsUi.getFormMargin();
+    formLayout.marginHeight = PropsUi.getFormMargin();
 
     shell.setLayout(formLayout);
     shell.setText(getString(PKG, "DetectLanguageDialog.Shell.Title"));
 
-    int middle = props.getMiddlePct();
-    int margin = props.getMargin();
+    int middle = PropsUi.getInstance().getMiddlePct();
+    int margin = PropsUi.getMargin();
 
     // TransformName line
     wlTransformName = new Label(shell, RIGHT);
     wlTransformName.setText(getString(PKG, "DetectLanguageDialog.TransformName.Label"));
-    props.setLook(wlTransformName);
+    PropsUi.setLook(wlTransformName);
     fdlTransformName = new FormData();
     fdlTransformName.left = new FormAttachment(0, 0);
     fdlTransformName.right = new FormAttachment(middle, -margin);
     fdlTransformName.top = new FormAttachment(0, margin);
     wlTransformName.setLayoutData(fdlTransformName);
     wTransformName = new Text(shell, SINGLE | LEFT | BORDER);
     wTransformName.setText(transformName);
-    props.setLook(wTransformName);
-    wTransformName.addModifyListener(lsMod);
+    PropsUi.setLook(wTransformName);
+    wTransformName.addListener(SWT.Modify, lsMod);
     fdTransformName = new FormData();
     fdTransformName.left = new FormAttachment(middle, 0);
     fdTransformName.top = new FormAttachment(0, margin);
@@ -118,20 +118,20 @@ public String open() {
     // CorpusFieldName field
     Label wlCorpusFieldName = new Label(shell, RIGHT);
     wlCorpusFieldName.setText(getString(PKG, "DetectLanguageDialog.CorpusFieldName.Label"));
-    props.setLook(wlCorpusFieldName);
+    PropsUi.setLook(wlCorpusFieldName);
     FormData fdlCorpusFieldName = new FormData();
     fdlCorpusFieldName.left = new FormAttachment(0, 0);
     fdlCorpusFieldName.right = new FormAttachment(middle, -margin);
     fdlCorpusFieldName.top = new FormAttachment(wTransformName, margin);
     wlCorpusFieldName.setLayoutData(fdlCorpusFieldName);
 
     wCorpusFieldName = new CCombo(shell, BORDER | READ_ONLY);
-    props.setLook(wCorpusFieldName);
-    wCorpusFieldName.addModifyListener(lsMod);
+    PropsUi.setLook(wCorpusFieldName);
+    wCorpusFieldName.addListener(SWT.Modify, lsMod);
     FormData fdCorpusFieldName = new FormData();
     fdCorpusFieldName.left = new FormAttachment(middle, 0);
     fdCorpusFieldName.top = new FormAttachment(wTransformName, margin);
-    fdCorpusFieldName.right = new FormAttachment(100, -margin);
+    fdCorpusFieldName.right = new FormAttachment(100, 0);
     wCorpusFieldName.setLayoutData(fdCorpusFieldName);
     wCorpusFieldName.addFocusListener(
         new FocusListener() {
@@ -167,21 +167,15 @@ public void focusGained(FocusEvent e) {
     fdParallelism.top = new FormAttachment(wCorpusFieldName, margin * 2);
     fdParallelism.right = new FormAttachment(100, 0);
     wParallelism.setLayoutData(fdParallelism);
-    wParallelism.addSelectionListener(
-        new SelectionAdapter() {
-          @Override
-          public void widgetSelected(SelectionEvent e) {
-            input.setChanged();
-          }
-        });
+    wParallelism.addListener(SWT.Selection, lsMod);
 
     // THE BUTTONS
     wOk = new Button(shell, PUSH);
     wOk.setText(getString(PKG, "System.Button.OK"));
     wCancel = new Button(shell, PUSH);
     wCancel.setText(getString(PKG, "System.Button.Cancel"));
 
-    setButtonPositions(new Button[] {wOk, wCancel}, margin, wCorpusFieldName);
+    setButtonPositions(new Button[] {wOk, wCancel}, margin, null);
 
     // Add listeners
     wOk.addListener(Selection, e -> ok());

plugins/transforms/detectlanguage/src/main/java/org/apache/hop/pipeline/transforms/language/DetectLanguageMeta.java

@@ -17,41 +17,41 @@
 
 package org.apache.hop.pipeline.transforms.language;
 
-import static org.apache.commons.lang3.StringUtils.equalsIgnoreCase;
 import static org.apache.hop.core.ICheckResult.TYPE_RESULT_ERROR;
 import static org.apache.hop.core.ICheckResult.TYPE_RESULT_OK;
 import static org.apache.hop.core.util.Utils.isEmpty;
-import static org.apache.hop.core.xml.XmlHandler.addTagValue;
-import static org.apache.hop.core.xml.XmlHandler.getTagValue;
 
 import java.util.List;
 import org.apache.hop.core.CheckResult;
 import org.apache.hop.core.ICheckResult;
 import org.apache.hop.core.annotations.Transform;
-import org.apache.hop.core.exception.HopXmlException;
 import org.apache.hop.core.row.IRowMeta;
 import org.apache.hop.core.row.IValueMeta;
 import org.apache.hop.core.row.value.ValueMetaNumber;
 import org.apache.hop.core.row.value.ValueMetaString;
 import org.apache.hop.core.variables.IVariables;
 import org.apache.hop.i18n.BaseMessages;
+import org.apache.hop.metadata.api.HopMetadataProperty;
 import org.apache.hop.metadata.api.IHopMetadataProvider;
 import org.apache.hop.pipeline.PipelineMeta;
 import org.apache.hop.pipeline.transform.BaseTransformMeta;
 import org.apache.hop.pipeline.transform.TransformMeta;
-import org.w3c.dom.Node;
 
 @Transform(
     id = "DetectLanguage",
     image = "detectlanguage.svg",
-    name = "i18n::BaseTransform.TypeLongDesc.DetectLanguage",
-    description = "i18n::BaseTransform.TypeTooltipDesc.DetectLanguage",
+    name = "i18n::DetectLanguage.Name",
+    description = "i18n::DetectLanguage.Description",
     categoryDescription = "i18n:org.apache.hop.pipeline.transform:BaseTransform.Category.Transform",
+    keywords = "i18n::DetectLanguage.Keyword",
     documentationUrl = "/pipeline/transforms/detectlanguage.html")
 public class DetectLanguageMeta extends BaseTransformMeta<DetectLanguage, DetectLanguageData> {
   private static final Class<?> PKG = DetectLanguageMeta.class;
 
+  @HopMetadataProperty(key = "corpusField", injectionKey = "FIELD")
   private String corpusField;
+
+  @HopMetadataProperty(key = "parallelism", injectionKey = "PARALLISM")
   private boolean parallelism = false;
 
   public DetectLanguageMeta() {
@@ -63,18 +63,6 @@ public void setDefault() {
     parallelism = false;
   }
 
-  @Override
-  public void loadXml(Node transformNode, IHopMetadataProvider metadataProvider)
-      throws HopXmlException {
-    try {
-      corpusField = getTagValue(transformNode, "corpusField");
-      parallelism = equalsIgnoreCase("Y", getTagValue(transformNode, "parallelism"));
-    } catch (Exception e) {
-      throw new HopXmlException(
-          BaseMessages.getString(PKG, "DetectLanguageMeta.Exception.UnableToReadTransformMeta"), e);
-    }
-  }
-
   @Override
   public void getFields(
       IRowMeta r,
@@ -101,14 +89,6 @@ private void valueMetaNumber(IRowMeta r, String name, String metaName) {
     r.addValueMeta(sText);
   }
 
-  @Override
-  public String getXml() {
-    return "    "
-        + addTagValue("corpusField", corpusField)
-        + "    "
-        + addTagValue("parallelism", parallelism);
-  }
-
   @Override
   public void check(
       List<ICheckResult> remarks,

plugins/transforms/detectlanguage/src/main/resources/org/apache/hop/pipeline/transforms/language/messages/messages_en_US.properties

@@ -16,38 +16,24 @@
 #
 
 DetectLanguage.ClassName=Detect Language
-BaseTransform.TypeLongDesc.DetectLanguage=Detect Language
-BaseTransform.TypeTooltipDesc.DetectLanguage=Examine text to identify the language.
+DetectLanguage.Name=Detect Language
+DetectLanguage.Description=Examine text to identify the language.
 DetectLanguageDialog.Shell.Title=Detect Language
-
 DetectLanguage.Error.CorpusFieldMissing=Corpus field is missing\!
-
 DetectLanguage.Exception.CouldnotFindField=Couldn''t find field ''{0}'' in row\!
+DetectLanguage.Keyword=tongue
 DetectLanguage.LineNumber=linenr {0}
 DetectLanguage.ErrorInTransformRunning=Because of an error, this transform can''t continue\: 
-
 DetectLanguageDialog.TransformName.Label=Transform name 
 DetectLanguageDialog.CorpusFieldName.Label=Corpus text field
-
 DetectLanguageDialog.FailedToGetFields.DialogTitle=Get fields failed
 DetectLanguageDialog.FailedToGetFields.DialogMessage=Unable to get fields from previous transforms because of an error
-DetectLanguageMeta.Exception.UnableToReadTransformMeta=Unable to read transform information from XML
-
 DetectLanguageMeta.CheckResult.CorpusFieldMissing=Corpus field is missing\!
 DetectLanguageMeta.CheckResult.CorpusFieldOK=Corpus field was specified.
-
 DetectLanguageMeta.CheckResult.NoInpuReceived=No input received from other transforms\!
-
 DetectLanguage.Log.UnexpectedError=Unexpected error in ''
-
-
 DetectLanguage.Log.ErrorFindingField=Error finding field\: 
 DetectLanguageMeta.CheckResult.CouldNotReadFields=Couldn''t read fields from the previous transform.
 DetectLanguageMeta.CheckResult.ReceivingInfoFromOtherTransforms=Transform is receiving info from other transforms.
-
 DetectLanguageMeta.CheckResult.ErrorOccurred=An error occurred\:
-
 DetectLanguageDialog.Parallelism.Label=Use Parallelism
-
-
-