ShellBuilder.java

/*
 * Copyright (c) 2009-present the original author or authors.
 *
 * 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.planet57.gshell.shell;

import com.planet57.gshell.branding.Branding;
import com.planet57.gshell.util.io.IO;
import com.planet57.gshell.variables.Variables;
import org.sonatype.goodies.common.ComponentSupport;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Provider;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

/**
 * {@link Shell} builder.
 *
 * @since 3.0
 */
@Named
public class ShellBuilder
  extends ComponentSupport
{
  private final Provider<ShellImpl> shellFactory;

  private Branding branding;

  private IO io;

  private Variables variables;

  @Inject
  public ShellBuilder(final Provider<ShellImpl> shellFactory) {
    this.shellFactory = checkNotNull(shellFactory);
  }

  public ShellBuilder branding(final Branding branding) {
    this.branding = branding;
    return this;
  }

  public ShellBuilder io(final IO io) {
    this.io = io;
    return this;
  }

  public ShellBuilder variables(final Variables variables) {
    this.variables = variables;
    return this;
  }

  public Shell build() {
    checkState(branding != null);
    checkState(io != null);
    checkState(variables != null);

    ShellImpl shell = shellFactory.get();
    shell.init(io, variables, branding);
    return shell;
  }
}