Java tutorial
/******************************************************************************* * Copyright (c) 2003, 2013 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - Initial API and implementation *******************************************************************************/ package org.eclipse.wst.ide.remote.ui.internal.viewers; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.osgi.util.NLS; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Combo; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.PlatformUI; import org.eclipse.wst.ide.remote.ui.internal.ContextIds; import org.eclipse.wst.ide.remote.ui.internal.Messages; import org.eclipse.wst.ide.remote.ui.internal.MonitorUIPlugin; import org.eclipse.wst.ide.remote.ui.internal.Trace; import org.eclipse.wst.ide.remote.ui.internal.provisional.ContentViewer; /** * A basic byte viewer. */ public class ByteViewer extends ContentViewer { protected static Text text; protected Label encodingLabel; protected Combo encodingCombo; protected Composite byteViewerBodyComposite; protected String encodingType = null; // Cache the content in order to encode the content when the user changes // the content protected byte[] contentArray; // copied from MonitorUI private static final String lineSeparator = System.getProperty("line.separator"); protected String[] encodings = null; /** (non-Javadoc) * @see ContentViewer#init(Composite) */ public void init(Composite parent) { byteViewerBodyComposite = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); layout.numColumns = 2; layout.marginHeight = 0; layout.marginWidth = 0; GridData data = new GridData( GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL | GridData.VERTICAL_ALIGN_BEGINNING); data.horizontalSpan = 2; byteViewerBodyComposite.setLayoutData(data); byteViewerBodyComposite.setLayout(layout); // This additional layout helps with aligning the text boxes in // org.eclipse.wst.ide.remote.ui.internal.view.MonitorView Composite request = new Composite(byteViewerBodyComposite, SWT.NONE); GridLayout layout2 = new GridLayout(); layout2.numColumns = 2; request.setLayout(layout2); encodingLabel = new Label(request, SWT.NONE); encodingLabel.setText(NLS.bind(Messages.viewEncoding, "")); encodingCombo = new Combo(request, SWT.RIGHT); // Add the default option encodingCombo.add(NLS.bind(Messages.defaultEncodingOption, "")); // Select the default option encodingCombo.select(0); if (encodings != null) { int size = encodings.length; for (int i = 0; i < size; i++) { encodingCombo.add(encodings[i]); } } encodingCombo.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent me) { encodingType = encodingCombo.getText(); if (contentArray != null) { setContent(contentArray); } } }); text = new Text(byteViewerBodyComposite, SWT.BORDER | SWT.MULTI | SWT.READ_ONLY | SWT.H_SCROLL | SWT.V_SCROLL); Display display = byteViewerBodyComposite.getDisplay(); text.setLayoutData(data); text.setBackground(display.getSystemColor(SWT.COLOR_LIST_BACKGROUND)); text.setForeground(display.getSystemColor(SWT.COLOR_LIST_FOREGROUND)); text.setFont(JFaceResources.getTextFont()); PlatformUI.getWorkbench().getHelpSystem().setHelp(text, ContextIds.VIEW_RESPONSE); } /** (non-Javadoc) * @see ContentViewer#setEditable(boolean) */ public void setEditable(boolean editable) { text.setEditable(editable); } /** (non-Javadoc) * @see ContentViewer#getContent() */ public byte[] getContent() { if (text == null) return new byte[0]; String content = text.getText().trim(); if (content.equals("")) return new byte[0]; // Need to ensure that there is a newline at the end of the content // getBytes() removes the newline byte[] twoNewlines = new byte[] { '\015', '\012' }; byte[] contentBytes = content.getBytes(); byte[] retBytes = new byte[contentBytes.length + 2]; System.arraycopy(contentBytes, 0, retBytes, 0, contentBytes.length); System.arraycopy(twoNewlines, 0, retBytes, contentBytes.length, 2); return retBytes; } /** (non-Javadoc) * @see ContentViewer#setContent(byte[]) */ public void setContent(byte[] b) { String out = ""; if (b != null) { contentArray = b; b = MonitorUIPlugin.unzip(b); out = parseEncoded(b); } int ls = lineSeparator.length(); if (out.length() > ls) { while (out.substring(0, ls).indexOf(lineSeparator) >= 0) out = out.substring(ls, out.length()); } text.setText(out); } public void setRespContent(byte[] b) { String out = ""; if (b != null) out = MonitorUIPlugin.parse(b); } public static void setContent(String s) { text.setText(s); } public void clear() { text.setText(""); } /** * Convenience method to parse the given bytes into String form. The bytes * are parsed into a line delimited string. The byte array must not be null. * * @param b a byte array * @return the string after the conversion */ public String parseEncoded(byte[] b) { if (b == null) throw new IllegalArgumentException(); ByteArrayInputStream bin = new ByteArrayInputStream(b); BufferedReader br = null; if (encodingType != null) { try { br = new BufferedReader(new InputStreamReader(bin, encodingType)); } catch (UnsupportedEncodingException e) { if (Trace.FINEST) { Trace.trace(Trace.STRING_FINEST, "An unsupported encoding exception when using encodingType=" + encodingType, e); } // If it is unsupported, use default. No prompt is given to the user br = new BufferedReader(new InputStreamReader(bin)); } } else { br = new BufferedReader(new InputStreamReader(bin)); } StringBuffer sb = new StringBuffer(); try { String s = br.readLine(); while (s != null) { sb.append(s); s = br.readLine(); if (s != null) sb.append(lineSeparator); } } catch (Exception e) { if (Trace.SEVERE) { Trace.trace(Trace.STRING_SEVERE, "Error parsing input", e); } } return sb.toString(); } /** (non-Javadoc) * @see ContentViewer#dispose() */ public void dispose() { text.dispose(); text = null; encodingCombo.dispose(); encodingCombo = null; encodingLabel.dispose(); encodingLabel = null; byteViewerBodyComposite.dispose(); byteViewerBodyComposite = null; } /** (non-Javadoc) * * Sets the encodings to show in the encodings combo box * */ public void setEncodings(String[] str) { this.encodings = str; } }