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/*******************************************************************************
 * Copyright (c) 2000, 2005 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.jface.text.templates;


/**
 * A simple template variable resolver, which always evaluates to a defined string.
 * <p>
 * Clients may instantiate and extend this class.
 * </p>
 *
 * @since 3.0
 */
public class SimpleTemplateVariableResolver extends TemplateVariableResolver {

  /** The string to which this variable evaluates. */
  private String fEvaluationString;

  /*
   * @see TemplateVariableResolver#TemplateVariableResolver(String, String)
   */
  protected SimpleTemplateVariableResolver(String type, String description) {
    super(type, description);
  }

  /**
   * Sets the string to which this variable evaluates.
   *
   * @param evaluationString the evaluation string, may be <code>null</code>.
   */
  public final void setEvaluationString(String evaluationString) {
    fEvaluationString= evaluationString;
  }

  /*
   * @see TemplateVariableResolver#evaluate(TemplateContext)
   */
  protected String resolve(TemplateContext context) {
    return fEvaluationString;
  }

  /**
   * Returns always <code>true</code>, since simple variables are normally
   * unambiguous.
   *
   * @param context {@inheritDoc}
   * @return <code>true</code>
   */
  protected boolean isUnambiguous(TemplateContext context) {
    return true;
  }
}
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