CompilationUnitImpl.java

/**********************************************************************
 * Copyright (c) 2005-2009 ant4eclipse project team.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Nils Hartmann, Daniel Kasmeroglu, Gerd Wuetherich
 **********************************************************************/
package org.ant4eclipse.lib.jdt.ecj.internal.tools;


import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.StringTokenizer;

import org.ant4eclipse.lib.core.Assure;
import org.ant4eclipse.lib.core.exception.Ant4EclipseException;
import org.ant4eclipse.lib.jdt.ecj.EcjExceptionCodes;
import org.ant4eclipse.lib.jdt.ecj.SourceFile;
import org.eclipse.jdt.internal.compiler.env.ICompilationUnit;

/**
 * <p>
 * Adapter class for providing java source files to the eclipse java compiler.
 * </p>
 * 
 * @author Nils Hartmann (nils@nilshartmann.net)
 * @author Gerd Wütherich (gerd@gerd-wuetherich.de)
 */
public class CompilationUnitImpl implements ICompilationUnit {

  /** the constant JAVA_FILE_POSTFIX */
  private static final String JAVA_FILE_POSTFIX = ".java";

  /** - */
  private SourceFile          _sourceFile;

  /** the file name, relative to the source folder */
  private char[]              _fileName;

  /** the name of the top level public type, e.g. {Hashtable} */
  private char[]              _mainTypeName;

  /** the name of the package , e.g. {java, lang} */
  private char[][]            _packageName;

  /**
   * <p>
   * Creates a new instance of type {@link CompilationUnitImpl}.
   * </p>
   * 
   * @param sourceFile
   *          the source file
   */
  public CompilationUnitImpl(SourceFile sourceFile) {
    Assure.notNull("sourceFile", sourceFile);

    this._sourceFile = sourceFile;

    this._fileName = this._sourceFile.getSourceFileName().toCharArray();

    // compute qualified name
    String qualifiedTypeName = getQualifiedTypeName(this._sourceFile.getSourceFileName());

    // compute package and main type name
    int v = qualifiedTypeName.lastIndexOf('.');
    this._mainTypeName = qualifiedTypeName.substring(v + 1).toCharArray();
    if ((v > 0) && (v < qualifiedTypeName.length())) {
      String packageName = qualifiedTypeName.substring(0, v);
      StringTokenizer packages = new StringTokenizer(packageName, ".");
      this._packageName = new char[packages.countTokens()][];
      for (int i = 0; i < this._packageName.length; i++) {
        this._packageName[i] = packages.nextToken().toCharArray();
      }
    } else {
      this._packageName = new char[0][];
    }
  }

  /**
   * {@inheritDoc}
   */
  public final char[] getMainTypeName() {
    return this._mainTypeName;

  }

  /**
   * {@inheritDoc}
   */
  public final char[][] getPackageName() {
    return this._packageName;
  }

  /**
   * {@inheritDoc}
   */
  public final char[] getFileName() {
    return this._fileName;
  }

  /**
   * {@inheritDoc}
   */
  public final char[] getContents() {
    String filename = new String(this._fileName);
    File sourceFile = new File(this._sourceFile.getSourceFolder(), filename);

    StringBuffer result = new StringBuffer();

    try {
      BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(sourceFile), this._sourceFile
          .getEncoding()));

      String str;
      while ((str = in.readLine()) != null) {
        result.append(str);
        result.append("\n");
      }
    } catch (UnsupportedEncodingException e) {
      throw new Ant4EclipseException(e, EcjExceptionCodes.UNABLE_TO_READ_COMPILATION_CONTENT_EXCEPTION, filename,
          this._sourceFile.getSourceFolder(), this._sourceFile.getEncoding());
    } catch (IOException e) {
      throw new Ant4EclipseException(e, EcjExceptionCodes.UNABLE_TO_READ_COMPILATION_CONTENT_EXCEPTION, filename,
          this._sourceFile.getSourceFolder(), this._sourceFile.getEncoding());
    }
    return result.toString().toCharArray();
  }

  /**
   * <p>
   * </p>
   * 
   * @return
   */
  public SourceFile getSourceFile() {
    return this._sourceFile;
  }

  /**
   * <p>
   * Returns the qualified type name for the given type name.
   * </p>
   * 
   * @param fileName
   *          the file name to resolve
   * @return the qualified type name for the given type name.
   */
  private String getQualifiedTypeName(String fileName) {
    if (fileName.toLowerCase().endsWith(JAVA_FILE_POSTFIX)) {
      return fileName.substring(0, fileName.length() - 5).replace(File.separatorChar, '.');
    } else {
      return fileName.replace(File.separatorChar, '.');
    }
  }

  public boolean ignoreOptionalProblems() {
    return false;
  }
}