ForeachLoop.java example

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/*
 * 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.control;

import static org.jboss.errai.codegen.builder.callstack.LoadClassReference.getClassReference;

import org.jboss.errai.codegen.AbstractStatement;
import org.jboss.errai.codegen.Context;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.Variable;

/**
 * Foreach statement (enhanced for loop).
 *
 * @author Christian Sadilek <csadilek@redhat.com>
 */
public class ForeachLoop extends AbstractStatement {

  private final Variable loopVar;
  private final String collectionExpr;
  private final Statement body;
  private final boolean nullSafe;

  public ForeachLoop(Variable loopVar, String collectionExpr, Statement body, boolean nullSafe) {
    this.loopVar = loopVar;
    this.collectionExpr = collectionExpr;
    this.body = body;
    this.nullSafe = nullSafe;
  }

  String generatedCache;

  @Override
  public String generate(Context context) {
    if (generatedCache != null) return generatedCache;

    return generatedCache
            = ((nullSafe) ? "if (" + collectionExpr + " != null) {\n" : "")
            + "for (" + getClassReference(loopVar.getType(), context)
            + " " + loopVar.getName() + " : " + collectionExpr + ") {"
            + "\n\t" + body.generate(context).replaceAll("\n", "\n\t")
            + "\n}"
            + ((nullSafe) ? "\n}" : "");
  }
}