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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.core.internal.variables;
import java.text.MessageFormat;
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;
/**
* 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, MessageFormat.format(VariablesMessages.getString("DynamicVariable.0"), new String[]{argument, getName()}), null)); //$NON-NLS-1$
}
}
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, MessageFormat.format("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, MessageFormat.format("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();
}
}
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