Java tutorial
/* * Copyright 2012 Amazon Technologies, Inc. * * Licensed 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://aws.amazon.com/apache2.0 * * This file 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. */ package com.amazonaws.eclipse.explorer.dynamodb; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.layout.TableColumnLayout; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ColumnPixelData; import org.eclipse.jface.viewers.ILabelProviderListener; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.Text; import com.amazonaws.eclipse.core.AwsToolkitCore; import com.amazonaws.services.dynamodbv2.model.AttributeDefinition; import com.amazonaws.services.dynamodbv2.model.KeySchemaElement; import com.amazonaws.services.dynamodbv2.model.DescribeTableRequest; import com.amazonaws.services.dynamodbv2.model.KeyType; import com.amazonaws.services.dynamodbv2.model.LocalSecondaryIndexDescription; import com.amazonaws.services.dynamodbv2.model.ProjectionType; import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput; import com.amazonaws.services.dynamodbv2.model.TableDescription; import com.amazonaws.services.dynamodbv2.model.UpdateTableRequest; /** * Dialog to show the table properties. */ public class TablePropertiesDialog extends MessageDialog { private final String tableName; private final TableDescription tableDescription; private Text writeCapacityText; private Text readCapacityText; private Long readCapacity; private Long writeCapacity; protected TablePropertiesDialog(String tableName) { super(Display.getCurrent().getActiveShell(), "Table properties for " + tableName, AwsToolkitCore.getDefault().getImageRegistry().get(AwsToolkitCore.IMAGE_AWS_ICON), null, MessageDialog.NONE, new String[] { "Update", "Cancel" }, 1); this.tableName = tableName; tableDescription = AwsToolkitCore.getClientFactory().getDynamoDBV2Client() .describeTable(new DescribeTableRequest().withTableName(tableName)).getTable(); readCapacity = tableDescription.getProvisionedThroughput().getReadCapacityUnits(); writeCapacity = tableDescription.getProvisionedThroughput().getWriteCapacityUnits(); setShellStyle(getShellStyle() | SWT.RESIZE); } public UpdateTableRequest getUpdateRequest() { return new UpdateTableRequest().withTableName(tableName) .withProvisionedThroughput(new ProvisionedThroughput().withReadCapacityUnits(readCapacity) .withWriteCapacityUnits(writeCapacity)); } @Override protected Control createCustomArea(Composite parent) { Composite comp = new Composite(parent, SWT.NONE); GridDataFactory.fillDefaults().grab(true, true).applyTo(comp); GridLayoutFactory.fillDefaults().numColumns(2).applyTo(comp); newLabel(comp).setText("Created on:"); newReadOnlyTextField(comp).setText(tableDescription.getCreationDateTime().toString()); newLabel(comp).setText("Status:"); newReadOnlyTextField(comp).setText(tableDescription.getTableStatus()); newLabel(comp).setText("Item count:"); newReadOnlyTextField(comp).setText(tableDescription.getItemCount().toString()); newLabel(comp).setText("Size (bytes):"); newReadOnlyTextField(comp).setText(tableDescription.getTableSizeBytes().toString()); newLabel(comp).setText("Hash key attribute:"); newReadOnlyTextField(comp).setText(getHashKeyName()); newLabel(comp).setText("Hash key type:"); newReadOnlyTextField(comp).setText(getAttributeType(getHashKeyName())); if (getRangeKeyName() != null) { new Label(comp, SWT.READ_ONLY).setText("Range key attribute:"); newReadOnlyTextField(comp).setText(getRangeKeyName()); new Label(comp, SWT.READ_ONLY).setText("Range key type:"); newReadOnlyTextField(comp).setText(getAttributeType(getRangeKeyName())); } new Label(comp, SWT.READ_ONLY).setText("Read capacity units:"); readCapacityText = newTextField(comp); readCapacityText.setText(readCapacity.toString()); readCapacityText.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { try { readCapacity = Long.parseLong(readCapacityText.getText()); } catch (NumberFormatException e1) { readCapacity = null; } validate(); } }); new Label(comp, SWT.READ_ONLY).setText("Write capacity units:"); writeCapacityText = newTextField(comp); writeCapacityText.setText(writeCapacity.toString()); writeCapacityText.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { try { writeCapacity = Long.parseLong(writeCapacityText.getText()); } catch (NumberFormatException e1) { writeCapacity = null; } validate(); } }); if (tableDescription.getProvisionedThroughput().getLastIncreaseDateTime() != null) { new Label(comp, SWT.READ_ONLY).setText("Provisioned throughput last increased:"); newReadOnlyTextField(comp) .setText(tableDescription.getProvisionedThroughput().getLastIncreaseDateTime().toString()); } if (tableDescription.getProvisionedThroughput().getLastDecreaseDateTime() != null) { new Label(comp, SWT.READ_ONLY).setText("Provisioned throughput last decreased:"); newReadOnlyTextField(comp) .setText(tableDescription.getProvisionedThroughput().getLastDecreaseDateTime().toString()); } // Local secondary index Group group = new Group(comp, SWT.NONE); group.setText("Local Secondary Index"); group.setLayout(new GridLayout(1, false)); GridDataFactory.fillDefaults().grab(true, true).span(2, SWT.DEFAULT).applyTo(group); IndexTable table = new IndexTable(group); GridDataFactory.fillDefaults().grab(true, true).applyTo(table); table.refresh(); return comp; } @Override protected void createButtonsForButtonBar(Composite parent) { super.createButtonsForButtonBar(parent); validate(); } private Text newTextField(Composite comp) { Text text = new Text(comp, SWT.BORDER); GridDataFactory.fillDefaults().grab(true, false).applyTo(text); return text; } private Text newReadOnlyTextField(Composite comp) { Text text = new Text(comp, SWT.READ_ONLY); text.setBackground(comp.getBackground()); GridDataFactory.fillDefaults().grab(true, false).applyTo(text); return text; } private Label newLabel(Composite comp) { Label label = new Label(comp, SWT.NONE); GridDataFactory.fillDefaults().grab(true, false).applyTo(label); return label; } private void validate() { if (readCapacity == null || readCapacity < 5) { setErrorMessage("Please enter a read capacity of 5 or more."); return; } if (writeCapacity == null || writeCapacity < 5) { setErrorMessage("Please enter a write capacity of 5 or more."); return; } setErrorMessage(null); } private void setErrorMessage(String message) { getButton(0).setEnabled(message == null); } private String getHashKeyName() { for (KeySchemaElement element : tableDescription.getKeySchema()) { if (element.getKeyType().equals(KeyType.HASH.toString())) { return element.getAttributeName(); } } return null; } private String getRangeKeyName() { for (KeySchemaElement element : tableDescription.getKeySchema()) { if (element.getKeyType().equals(KeyType.RANGE.toString())) { return element.getAttributeName(); } } return null; } private String getAttributeType(String attributeName) { for (AttributeDefinition definition : tableDescription.getAttributeDefinitions()) { if (definition.getAttributeName().equals(attributeName)) { return definition.getAttributeType(); } } return null; } // The table to show the local secondary index info private class IndexTable extends Composite { private TableViewer viewer; private IndexTableContentProvider contentProvider; private IndexTableLabelProvider labelProvider; IndexTable(Composite parent) { super(parent, SWT.NONE); TableColumnLayout tableColumnLayout = new TableColumnLayout(); this.setLayout(tableColumnLayout); contentProvider = new IndexTableContentProvider(); labelProvider = new IndexTableLabelProvider(); viewer = new TableViewer(this, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); viewer.getTable().setLinesVisible(true); viewer.getTable().setHeaderVisible(true); viewer.setLabelProvider(labelProvider); viewer.setContentProvider(contentProvider); createColumns(tableColumnLayout, viewer.getTable()); } // Enforce call getElement method in contentProvider public void refresh() { viewer.setInput(new Object()); } protected final class IndexTableContentProvider extends ArrayContentProvider { @Override public void dispose() { } @Override public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } @Override public Object[] getElements(Object inputElement) { if (tableDescription == null || tableDescription.getLocalSecondaryIndexes() == null) { return new LocalSecondaryIndexDescription[0]; } return tableDescription.getLocalSecondaryIndexes().toArray(); } } protected final class IndexTableLabelProvider implements ITableLabelProvider { public void addListener(ILabelProviderListener listener) { } public void removeListener(ILabelProviderListener listener) { } public void dispose() { } public boolean isLabelProperty(Object element, String property) { return false; } public Image getColumnImage(Object element, int columnIndex) { return null; } public String getColumnText(Object element, int columnIndex) { if (element instanceof LocalSecondaryIndexDescription == false) return ""; LocalSecondaryIndexDescription index = (LocalSecondaryIndexDescription) element; switch (columnIndex) { case 0: return index.getIndexName(); case 1: String returnString = ""; returnString += index.getKeySchema().get(1).getAttributeName() + " ("; returnString += getAttributeType(index.getKeySchema().get(1).getAttributeName()) + ")"; return returnString; case 2: return index.getIndexSizeBytes().toString(); case 3: return index.getItemCount().toString(); case 4: return getProjectionAttributes(index); } return element.toString(); } } // Generate a String has the detail info about projection in this LSI private String getProjectionAttributes(LocalSecondaryIndexDescription index) { String returnString = ""; if (index.getProjection().getProjectionType().equals(ProjectionType.ALL.toString())) { return index.getProjection().getProjectionType(); } else if (index.getProjection().getProjectionType().equals(ProjectionType.INCLUDE.toString())) { for (String attribute : index.getProjection().getNonKeyAttributes()) { returnString += attribute + ", "; } returnString = returnString.substring(0, returnString.length() - 2); return returnString; } else { returnString += getHashKeyName() + ", "; if (getRangeKeyName() != null) { returnString += getRangeKeyName() + ", "; } returnString += index.getKeySchema().get(1).getAttributeName(); return returnString; } } private void createColumns(TableColumnLayout columnLayout, Table table) { createColumn(table, columnLayout, "Index Name"); createColumn(table, columnLayout, "Attribute To Index"); createColumn(table, columnLayout, "Index Size (Bytes)"); createColumn(table, columnLayout, "Item Count"); createColumn(table, columnLayout, "Projected Attributes"); } private TableColumn createColumn(Table table, TableColumnLayout columnLayout, String text) { TableColumn column = new TableColumn(table, SWT.NONE); column.setText(text); column.setMoveable(true); columnLayout.setColumnData(column, new ColumnPixelData(150)); return column; } } }