DeferredCallElement.java example

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errai-master
/*
 * 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.exception.GenerationException;

/**
 * An element for deferring and offloading validation and generation work for building the
 * call stack.
 * 
 * @author Mike Brock <cbrock@redhat.com>
 */
public class DeferredCallElement extends AbstractCallElement {
  private final DeferredCallback callback;

  public DeferredCallElement(final DeferredCallback callback) {
    this.callback = callback;
  }

  @Override
  public void handleCall(final CallWriter writer,
                         final Context context,
                         final Statement statement) {

    try {
      callback.doDeferred(writer, context, statement);
  
      if (next != null) {
        writer.append(".");
        getNext().handleCall(writer, context, statement);
      }
    } 
    catch (GenerationException e) {
      blameAndRethrow(e);
    }
  }

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