/*
 * Copyright (C) 2011 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.jboss.errai.codegen.builder.callstack;

import org.jboss.errai.codegen.Context;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.control.AbstractConditionalBlock;
import org.jboss.errai.codegen.exception.GenerationException;

/**
 * A {@link CallElement} for conditional blocks. It can only be the last
 * element in a chain of calls.
 * 
 * @author Christian Sadilek <csadilek@redhat.com>
 */
public class ConditionalBlockCallElement extends AbstractCallElement {
  private final AbstractConditionalBlock conditionalBlock;
  
  public ConditionalBlockCallElement(final AbstractConditionalBlock conditionalBlock) {
    this.conditionalBlock = conditionalBlock;
  }

  @Override
  public void handleCall(final CallWriter writer, final Context context, final Statement lhs) {
    try {
      if (lhs != null) {
        // The LHS value is on the current callstack. So we grab the value from there at generation time.
        conditionalBlock.getCondition().setLhs(lhs);
        conditionalBlock.getCondition().setLhsExpr(writer.getCallString());
      }
      writer.reset();
      writer.append(conditionalBlock.generate(Context.create(context)));
    } 
    catch(GenerationException e) {
      blameAndRethrow(e);
    }
  }

  @Override
  public String toString() {
    return "[[Conditional<" + conditionalBlock + ">]" + next + "]";
  }
}