com.querydsl.codegen.utils.AbstractCodeWriter Maven / Gradle / Ivy

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/*
 * Copyright 2010, Mysema Ltd
 *
 * 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.querydsl.codegen.utils;

import java.io.IOException;

/**
 * @author tiwe
 * @param 
 */
public abstract class AbstractCodeWriter>
    implements Appendable, CodeWriter {

  private final Appendable appendable;

  private final int spaces;

  private final String spacesString;

  private String indent = "";

  @SuppressWarnings("unchecked")
  private final T self = (T) this;

  public AbstractCodeWriter(Appendable appendable, int spaces) {
    if (appendable == null) {
      throw new IllegalArgumentException("appendable is null");
    }
    this.appendable = appendable;
    this.spaces = spaces;
    this.spacesString = StringUtils.repeat(' ', spaces);
  }

  @Override
  public T append(char c) throws IOException {
    appendable.append(c);
    return self;
  }

  @Override
  public T append(CharSequence csq) throws IOException {
    appendable.append(csq);
    return self;
  }

  @Override
  public T append(CharSequence csq, int start, int end) throws IOException {
    appendable.append(csq, start, end);
    return self;
  }

  @Override
  public T beginLine(String... segments) throws IOException {
    append(indent);
    for (String segment : segments) {
      append(segment);
    }
    return self;
  }

  protected T goIn() {
    indent += spacesString;
    return self;
  }

  protected T goOut() {
    if (indent.length() >= spaces) {
      indent = indent.substring(0, indent.length() - spaces);
    }
    return self;
  }

  @Override
  public T line(String... segments) throws IOException {
    append(indent);
    for (String segment : segments) {
      append(segment);
    }
    return nl();
  }

  @Override
  public T nl() throws IOException {
    return append("\n");
  }
}