net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/externaltools/internal/registry/ExternalToolVariable.java

   1 package net.sourceforge.phpdt.externaltools.internal.registry;
   2
   3 /**********************************************************************
   4 Copyright (c) 2002 IBM Corp. and others. All rights reserved.
   5 This file is made available under the terms of the Common Public License v1.0
   6 which accompanies this distribution, and is available at
   7 http://www.eclipse.org/legal/cpl-v10.html
   8
   9 Contributors:
  10 **********************************************************************/
  11
  12 import net.sourceforge.phpdt.externaltools.group.IGroupDialogPage;
  13 import net.sourceforge.phpdt.externaltools.internal.model.ExternalToolsModelMessages;
  14 import net.sourceforge.phpdt.externaltools.variable.IVariableComponent;
  15 import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  16
  17 import org.eclipse.core.runtime.CoreException;
  18 import org.eclipse.core.runtime.IConfigurationElement;
  19 import org.eclipse.jface.resource.JFaceColors;
  20 import org.eclipse.swt.SWT;
  21 import org.eclipse.swt.layout.GridData;
  22 import org.eclipse.swt.widgets.Composite;
  23 import org.eclipse.swt.widgets.Control;
  24 import org.eclipse.swt.widgets.Label;
  25
  26 /**
  27  * Abtract representation of the different variables.
  28  */
  29 public abstract class ExternalToolVariable {
  30         private static final IVariableComponent defaultComponent = new DefaultVariableComponent(false);
  31
  32         private String tag;
  33         private String description;
  34         private IConfigurationElement element;
  35
  36         /**
  37          * Creates an variable definition
  38          *
  39          * @param tag the variable tag
  40          * @param description a short description of what the variable will expand to
  41          * @param element the configuration element
  42          */
  43         /*package*/ ExternalToolVariable(String tag, String description, IConfigurationElement element) {
  44                 super();
  45                 this.tag = tag;
  46                 this.description = description;
  47                 this.element = element;
  48         }
  49
  50         /**
  51          * Creates an instance of the class specified by
  52          * the given element attribute name. Can return
  53          * <code>null</code> if none or if problems creating
  54          * the instance.
  55          */
  56         protected final Object createObject(String attributeName) {
  57                 try {
  58                         return element.createExecutableExtension(attributeName);
  59                 } catch (CoreException e) {
  60       PHPeclipsePlugin.getDefault().getLog().log(e.getStatus());
  61                         return null;
  62                 }
  63         }
  64
  65         /**
  66          * Returns the component class to allow
  67          * visual editing of the variable's value.
  68          */
  69         public final IVariableComponent getComponent() {
  70                 String className = element.getAttribute(ExternalToolVariableRegistry.TAG_COMPONENT_CLASS);
  71                 if (className == null || className.trim().length() == 0)
  72                         return defaultComponent;
  73
  74                 Object component = createObject(ExternalToolVariableRegistry.TAG_COMPONENT_CLASS);
  75                 if (component == null)
  76                         return new DefaultVariableComponent(true);
  77                 else
  78                         return (IVariableComponent)component;
  79         }
  80
  81         /**
  82          * Returns the variable's description
  83          */
  84         public final String getDescription() {
  85                 return description;
  86         }
  87
  88         /**
  89          * Returns the variable's tag
  90          */
  91         public final String getTag() {
  92                 return tag;
  93         }
  94
  95
  96         /**
  97          * Default variable component implementation which does not
  98          * allow variable value editing visually.
  99          */
 100         private static final class DefaultVariableComponent implements IVariableComponent {
 101                 private boolean showError = false;
 102                 private Label message = null;
 103
 104                 public DefaultVariableComponent(boolean showError) {
 105                         super();
 106                         this.showError = showError;
 107                 }
 108
 109                 /* (non-Javadoc)
 110                  * Method declared on IVariableComponent.
 111                  */
 112                 public Control getControl() {
 113                         return message;
 114                 }
 115
 116                 /* (non-Javadoc)
 117                  * Method declared on IVariableComponent.
 118                  */
 119                 public void createContents(Composite parent, String varTag, IGroupDialogPage page) {
 120                         if (showError) {
 121                                 message = new Label(parent, SWT.NONE);
 122                                 GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 123                                 message.setLayoutData(data);
 124                                 message.setFont(parent.getFont());
 125                                 message.setText(ExternalToolsModelMessages.getString("ExternalToolVariable.componentErrorMessage")); //$NON-NLS-1$
 126                                 message.setForeground(JFaceColors.getErrorText(message.getDisplay()));
 127                         }
 128                 }
 129
 130                 /* (non-Javadoc)
 131                  * Method declared on IVariableComponent.
 132                  */
 133                 public String getVariableValue() {
 134                         return null;
 135                 }
 136
 137                 /* (non-Javadoc)
 138                  * Method declared on IVariableComponent.
 139                  */
 140                 public boolean isValid() {
 141                         return true;
 142                 }
 143
 144                 /* (non-Javadoc)
 145                  * Method declared on IVariableComponent.
 146                  */
 147                 public void setVariableValue(String varValue) {
 148                 }
 149
 150                 /* (non-Javadoc)
 151                  * Method declared on IVariableComponent.
 152                  */
 153                 public void validate() {
 154                 }
 155         }
 156 }