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/*
 * Copyright 2006 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.dev.cfg;

import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.RebindMode;
import com.google.gwt.core.ext.RebindResult;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.dev.javac.StandardGeneratorContext;

/**
 * A rule to replace the type being rebound with an explicitly named class.
 */
public class RuleReplaceWith extends Rule {

  private final String replacementTypeName;

  public RuleReplaceWith(String typeName) {
    this.replacementTypeName = typeName;
  }

  @Override
  public void generateRuntimeRebindClasses(
      TreeLogger logger, ModuleDef module, GeneratorContext context)
      throws UnableToCompleteException {
    runtimeRebindRuleGenerator.generate(
        generateCreateInstanceExpression(), generateMatchesExpression());
  }

  public String getReplacementTypeName() {
    return replacementTypeName;
  }

  @Override
  public RebindResult realize(TreeLogger logger,
      StandardGeneratorContext context, String typeName)
      throws UnableToCompleteException {
    return new RebindResult(
        RebindMode.USE_EXISTING, replacementTypeName);
  }

  @Override
  public String toString() {
    return "";
  }

  @Override
  protected String generateCreateInstanceExpression() {
    return "return @" + getReplacementTypeName() + "::new()();";
  }

  @Override
  protected String generateMatchesExpression() {
    return "return " + getRootCondition().toSource() + ";";
  }
}