span.java

Checkstyle 可寻找：·不能使用的或者多余的输入 ·空格更好的地方不使用跳格符

//Transmogrify License
// 
//Copyright (c) 2001, ThoughtWorks, Inc.
//All rights reserved.
//Redistribution and use in source and binary forms, with or without
//modification, are permitted provided that the following conditions
//are met:
//- Redistributions of source code must retain the above copyright notice,
//this list of conditions and the following disclaimer.
//- Redistributions in binary form must reproduce the above copyright
//notice, this list of conditions and the following disclaimer in the
//documentation and/or other materials provided with the distribution.
//Neither the name of the ThoughtWorks, Inc. nor the names of its
//contributors may be used to endorse or promote products derived from this
//software without specific prior written permission.
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
//TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
//PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
//CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
//EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
//PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
//OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
//WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
//OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
//ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package com.puppycrawl.tools.checkstyle.checks.usage.transmogrify;

public class Span {

  private int _startLine;
  private int _startColumn;
  private int _endLine;
  private int _endColumn;

  public Span() {}

  public Span(int startLine, int startColumn, int endLine, int endColumn) {
    setStart(startLine, startColumn);
    setEnd(endLine, endColumn);
  }

  public Span( Span span ) {
    this( span.getStartLine(), span.getStartColumn(),
          span.getEndLine(), span.getEndColumn() );
  }

  public void setStart(int startLine, int startColumn) {
    _startLine = startLine;
    _startColumn = startColumn;
  }

  public void setEnd(int endLine, int endColumn) {
    _endLine = endLine;
    _endColumn = endColumn;
  }

  public int getStartLine() {
    return _startLine;
  }

  public int getStartColumn() {
    return _startColumn;
  }

  public int getEndLine() {
    return _endLine;
  }

  public int getEndColumn() {
    return _endColumn;
  }

  public boolean contains( Span span ) {
    return ( contains(span.getStartLine(), span.getStartColumn())
             && contains( span.getEndLine(), span.getEndColumn()) );
  }

  public boolean contains(int line, int column) {
    boolean afterStart = false;
    boolean beforeEnd = false;

    if ( getStartLine() < line ) {
      afterStart = true;
    }
    else if ( getStartLine() == line && getStartColumn() <= column ) {
      afterStart = true;
    }

    if ( getEndLine() > line ) {
      beforeEnd = true;
    }
    else if ( getEndLine() == line && getEndColumn() >= column ) {
      beforeEnd = true;
    }

    return ( afterStart && beforeEnd );
  }

  protected boolean startsBefore( Span span ) {
    boolean result = false;
    if ( getStartLine() < span.getStartLine() ) {
      result = true;
    }
    else if ( getStartLine() == span.getStartLine()
              && getStartColumn() <= span.getStartColumn() ) {
      result = true;
    }

    return result;
  }

  protected boolean endsAfter( Span span ) {
    boolean result = false;
    if ( getEndLine() > span.getEndLine() ) {
      result = true;
    }
    else if ( getEndLine() == span.getEndLine()
              && getEndColumn() >= span.getEndColumn() ) {
      result = true;
    }

    return result;
  }

  public void compose( Span span ) {
    if ( span.startsBefore( this ) ) {
      setStart( span.getStartLine(), span.getStartColumn() );
    }
    if ( span.endsAfter( this ) ) {
      setEnd( span.getEndLine(), span.getEndColumn() );
    }
  }

  public boolean equals(Object o) {
    boolean result = false;
    if ( o instanceof Span ) {
      Span span = (Span)o;
      result = ( span.getStartLine() == getStartLine()
                 && span.getStartColumn() == getStartColumn()
                 && span.getEndLine() == getEndLine()
                 && span.getEndColumn() == getEndColumn() );
    }
    return result;
  }

  public String toString() {
    return "[" + getStartLine() + "," + getStartColumn()
      + ":" + getEndLine() + "," + getEndColumn() + "]";
  }

}