| /******************************************************************************* |
| * Copyright (c) 2000, 2006 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.core.internal.variables; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.core.variables.IDynamicVariable; |
| import org.eclipse.core.variables.IDynamicVariableResolver; |
| import org.eclipse.core.variables.VariablesPlugin; |
| import org.eclipse.osgi.util.NLS; |
| |
| /** |
| * Dynamic variable |
| */ |
| public class DynamicVariable extends StringVariable implements IDynamicVariable { |
| |
| /** |
| * Resolver, or <code>null</code> until needed |
| */ |
| private IDynamicVariableResolver fResolver; |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.debug.internal.core.stringsubstitution.IContextVariable#getValue(java.lang.String) |
| */ |
| public String getValue(String argument) throws CoreException { |
| if (!supportsArgument()) { |
| // check for an argument - not supported |
| if (argument != null && argument.length() > 0) { |
| throw new CoreException(new Status(IStatus.ERROR, VariablesPlugin.getUniqueIdentifier(), VariablesPlugin.INTERNAL_ERROR, NLS.bind(VariablesMessages.DynamicVariable_0, new String[]{argument, getName()}), null)); |
| } |
| } |
| if (fResolver == null) { |
| String name = getConfigurationElement().getAttribute("resolver"); //$NON-NLS-1$ |
| if (name == null) { |
| throw new CoreException(new Status(IStatus.ERROR, VariablesPlugin.getUniqueIdentifier(), VariablesPlugin.INTERNAL_ERROR, NLS.bind("Contributed context variable {0} must specify a resolver.",new String[]{getName()}), null)); //$NON-NLS-1$ |
| } |
| Object object = getConfigurationElement().createExecutableExtension("resolver"); //$NON-NLS-1$ |
| if (object instanceof IDynamicVariableResolver) { |
| fResolver = (IDynamicVariableResolver)object; |
| } else { |
| throw new CoreException(new Status(IStatus.ERROR, VariablesPlugin.getUniqueIdentifier(), VariablesPlugin.INTERNAL_ERROR, NLS.bind("Contributed context variable resolver for {0} must be an instance of IContextVariableResolver.",new String[]{getName()}), null)); //$NON-NLS-1$ |
| } |
| } |
| return fResolver.resolveValue(this, argument); |
| } |
| |
| /** |
| * Constructs a new context variable. |
| * |
| * @param name variable name |
| * @param description variable description or <code>null</code> |
| * @param configurationElement configuration element |
| */ |
| public DynamicVariable(String name, String description, IConfigurationElement configurationElement) { |
| super(name, description, configurationElement); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.core.variables.IDynamicVariable#supportsArgument() |
| */ |
| public boolean supportsArgument() { |
| String arg = getConfigurationElement().getAttribute("supportsArgument"); //$NON-NLS-1$ |
| return arg == null || Boolean.valueOf(arg).booleanValue(); |
| } |
| |
| } |