Package org.aspectj.org.eclipse.jdt.core

Source Code of org.aspectj.org.eclipse.jdt.core.JavaConventions

/*******************************************************************************
* Copyright (c) 2000, 2006 IBM Corporation and others.
* 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:
*     IBM Corporation - initial API and implementation
*******************************************************************************/
package org.aspectj.org.eclipse.jdt.core;

import java.util.StringTokenizer;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.aspectj.org.eclipse.jdt.core.compiler.*;
import org.aspectj.org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.aspectj.org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
import org.aspectj.org.eclipse.jdt.internal.compiler.parser.Scanner;
import org.aspectj.org.eclipse.jdt.internal.compiler.parser.ScannerHelper;
import org.aspectj.org.eclipse.jdt.internal.compiler.parser.TerminalTokens;
import org.aspectj.org.eclipse.jdt.internal.compiler.util.SuffixConstants;
import org.aspectj.org.eclipse.jdt.internal.core.*;
import org.aspectj.org.eclipse.jdt.internal.core.util.Messages;

/**
* Provides methods for checking Java-specific conventions such as name syntax.
* <p>
* This class provides static methods and constants only; it is not intended to be
* instantiated or subclassed by clients.
* </p>
*/
public final class JavaConventions {

  private static final char DOT= '.';
  private static final String PACKAGE_INFO = new String(TypeConstants.PACKAGE_INFO_NAME);
  private static final Scanner SCANNER = new Scanner(false /*comment*/, true /*whitespace*/, false /*nls*/, ClassFileConstants.JDK1_3 /*sourceLevel*/, null/*taskTag*/, null/*taskPriorities*/, true /*taskCaseSensitive*/);
 
  private JavaConventions() {
    // Not instantiable
  }

  /**
   * Returns whether the given package fragment root paths are considered
   * to overlap.
   * <p>
   * Two root paths overlap if one is a prefix of the other, or they point to
   * the same location. However, a JAR is allowed to be nested in a root.
   *
   * @param rootPath1 the first root path
   * @param rootPath2 the second root path
   * @return true if the given package fragment root paths are considered to overlap, false otherwise
   * @deprecated Overlapping roots are allowed in 2.1
   */
  public static boolean isOverlappingRoots(IPath rootPath1, IPath rootPath2) {
    if (rootPath1 == null || rootPath2 == null) {
      return false;
    }
    String extension1 = rootPath1.getFileExtension();
    String extension2 = rootPath2.getFileExtension();
    if (extension1 != null && (extension1.equalsIgnoreCase(SuffixConstants.EXTENSION_JAR) || extension1.equalsIgnoreCase(SuffixConstants.EXTENSION_ZIP))) {
      return false;
    }
    if (extension2 != null && (extension2.equalsIgnoreCase(SuffixConstants.EXTENSION_JAR) || extension2.equalsIgnoreCase(SuffixConstants.EXTENSION_ZIP))) {
      return false;
    }
    return rootPath1.isPrefixOf(rootPath2) || rootPath2.isPrefixOf(rootPath1);
  }

  /*
   * Returns the current identifier extracted by the scanner (without unicode
   * escapes) from the given id and for the given source and compliance levels.
   * Returns <code>null</code> if the id was not valid
   */
  private static synchronized char[] scannedIdentifier(String id, String sourceLevel, String complianceLevel) {
    if (id == null) {
      return null;
    }
    // Set scanner for given source and compliance levels
    SCANNER.sourceLevel = sourceLevel == null ? ClassFileConstants.JDK1_3 : CompilerOptions.versionToJdkLevel(sourceLevel);
    SCANNER.complianceLevel = complianceLevel == null ? ClassFileConstants.JDK1_3 : CompilerOptions.versionToJdkLevel(complianceLevel)

    try {
      SCANNER.setSource(id.toCharArray());
      int token = SCANNER.scanIdentifier();
      if (token != TerminalTokens.TokenNameIdentifier) return null;
      if (SCANNER.currentPosition == SCANNER.eofPosition) { // to handle case where we had an ArrayIndexOutOfBoundsException
        try {
          return SCANNER.getCurrentIdentifierSource();
        } catch (ArrayIndexOutOfBoundsException e) {
          return null;
        }
      } else {
        return null;
      }
    }
    catch (InvalidInputException e) {
      return null;
    }
  }

  /**
   * Validate the given compilation unit name.
   * <p>
   * A compilation unit name must obey the following rules:
   * <ul>
   * <li> it must not be null
   * <li> it must be suffixed by a dot ('.') followed by one of the
   *       {@link JavaCore#getJavaLikeExtensions() Java-like extensions}
   * <li> its prefix must be a valid identifier
   * <li> it must not contain any characters or substrings that are not valid
   *       on the file system on which workspace root is located.
   * </ul>
   * </p>
   * @param name the name of a compilation unit
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a compilation unit name, otherwise a status
   *    object indicating what is wrong with the name
   * @deprecated Use {@link #validateCompilationUnitName(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validateCompilationUnitName(String name) {
    return validateCompilationUnitName(name,CompilerOptions.VERSION_1_3,CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given compilation unit name for the given source and compliance levels.
   * <p>
   * A compilation unit name must obey the following rules:
   * <ul>
   * <li> it must not be null
   * <li> it must be suffixed by a dot ('.') followed by one of the
   *       {@link JavaCore#getJavaLikeExtensions() Java-like extensions}
   * <li> its prefix must be a valid identifier
   * <li> it must not contain any characters or substrings that are not valid
   *       on the file system on which workspace root is located.
   * </ul>
   * </p>
   * @param name the name of a compilation unit
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a compilation unit name, otherwise a status
   *    object indicating what is wrong with the name
   * @since 3.3
   */
  public static IStatus validateCompilationUnitName(String name, String sourceLevel, String complianceLevel) {
    if (name == null) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_unit_nullName, null);
    }
    if (!org.aspectj.org.eclipse.jdt.internal.core.util.Util.isJavaLikeFileName(name)) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_unit_notJavaName, null);
    }
    String identifier;
    int index;
    index = name.lastIndexOf('.');
    if (index == -1) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_unit_notJavaName, null);
    }
    identifier = name.substring(0, index);
    // JSR-175 metadata strongly recommends "package-info.java" as the
    // file in which to store package annotations and
    // the package-level spec (replaces package.html)
    if (!identifier.equals(PACKAGE_INFO)) {
      IStatus status = validateIdentifier(identifier, sourceLevel, complianceLevel);
      if (!status.isOK()) {
        return status;
      }
    }
    IStatus status = ResourcesPlugin.getWorkspace().validateName(name, IResource.FILE);
    if (!status.isOK()) {
      return status;
    }
    return JavaModelStatus.VERIFIED_OK;
  }

  /**
   * Validate the given .class file name.
   * <p>
   * A .class file name must obey the following rules:
   * <ul>
   * <li> it must not be null
   * <li> it must include the <code>".class"</code> suffix
   * <li> its prefix must be a valid identifier
   * <li> it must not contain any characters or substrings that are not valid
   *       on the file system on which workspace root is located.
   * </ul>
   * </p>
   * @param name the name of a .class file
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a .class file name, otherwise a status
   *    object indicating what is wrong with the name
   * @since 2.0
   * @deprecated Use {@link #validateClassFileName(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validateClassFileName(String name) {
    return validateClassFileName(name, CompilerOptions.VERSION_1_3, CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given .class file name for the given source and compliance levels.
   * <p>
   * A .class file name must obey the following rules:
   * <ul>
   * <li> it must not be null
   * <li> it must include the <code>".class"</code> suffix
   * <li> its prefix must be a valid identifier
   * <li> it must not contain any characters or substrings that are not valid
   *       on the file system on which workspace root is located.
   * </ul>
   * </p>
   * @param name the name of a .class file
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a .class file name, otherwise a status
   *    object indicating what is wrong with the name
   * @since 3.3
   */
  public static IStatus validateClassFileName(String name, String sourceLevel, String complianceLevel) {
    if (name == null) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_classFile_nullName, null);    }
    if (!org.aspectj.org.eclipse.jdt.internal.compiler.util.Util.isClassFileName(name)) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_classFile_notClassFileName, null);
    }
    String identifier;
    int index;
    index = name.lastIndexOf('.');
    if (index == -1) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_classFile_notClassFileName, null);
    }
    identifier = name.substring(0, index);
    // JSR-175 metadata strongly recommends "package-info.java" as the
    // file in which to store package annotations and
    // the package-level spec (replaces package.html)
    if (!identifier.equals(PACKAGE_INFO)) {
      IStatus status = validateIdentifier(identifier, sourceLevel, complianceLevel);
      if (!status.isOK()) {
        return status;
      }
    }
    IStatus status = ResourcesPlugin.getWorkspace().validateName(name, IResource.FILE);
    if (!status.isOK()) {
      return status;
    }
    return JavaModelStatus.VERIFIED_OK;
  }

  /**
   * Validate the given field name.
   * <p>
   * Syntax of a field name corresponds to VariableDeclaratorId (JLS2 8.3).
   * For example, <code>"x"</code>.
   *
   * @param name the name of a field
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a field name, otherwise a status
   *    object indicating what is wrong with the name
   * @deprecated Use {@link #validateFieldName(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validateFieldName(String name) {
    return validateIdentifier(name, CompilerOptions.VERSION_1_3,CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given field name for the given source and compliance levels.
   * <p>
   * Syntax of a field name corresponds to VariableDeclaratorId (JLS2 8.3).
   * For example, <code>"x"</code>.
   *
   * @param name the name of a field
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a field name, otherwise a status
   *    object indicating what is wrong with the name
   * @since 3.3
   */
  public static IStatus validateFieldName(String name, String sourceLevel, String complianceLevel) {
    return validateIdentifier(name, sourceLevel, complianceLevel);
  }

  /**
   * Validate the given Java identifier.
   * The identifier must not have the same spelling as a Java keyword,
   * boolean literal (<code>"true"</code>, <code>"false"</code>), or null literal (<code>"null"</code>).
   * See section 3.8 of the <em>Java Language Specification, Second Edition</em> (JLS2).
   * A valid identifier can act as a simple type name, method name or field name.
   *
   * @param id the Java identifier
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given identifier is a valid Java identifier, otherwise a status
   *    object indicating what is wrong with the identifier
   * @deprecated Use {@link #validateIdentifier(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validateIdentifier(String id) {
    return validateIdentifier(id,CompilerOptions.VERSION_1_3,CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given Java identifier for the given source and compliance levels
   * The identifier must not have the same spelling as a Java keyword,
   * boolean literal (<code>"true"</code>, <code>"false"</code>), or null literal (<code>"null"</code>).
   * See section 3.8 of the <em>Java Language Specification, Second Edition</em> (JLS2).
   * A valid identifier can act as a simple type name, method name or field name.
   *
   * @param id the Java identifier
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given identifier is a valid Java identifier, otherwise a status
   *    object indicating what is wrong with the identifier
   * @since 3.3
   */
  public static IStatus validateIdentifier(String id, String sourceLevel, String complianceLevel) {
    if (scannedIdentifier(id, sourceLevel, complianceLevel) != null) {
      return JavaModelStatus.VERIFIED_OK;
    } else {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.bind(Messages.convention_illegalIdentifier, id), null);
    }
  }

  /**
   * Validate the given import declaration name.
   * <p>
   * The name of an import corresponds to a fully qualified type name
   * or an on-demand package name as defined by ImportDeclaration (JLS2 7.5).
   * For example, <code>"java.util.*"</code> or <code>"java.util.Hashtable"</code>.
   *
   * @param name the import declaration
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as an import declaration, otherwise a status
   *    object indicating what is wrong with the name
   * @deprecated Use {@link #validateImportDeclaration(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validateImportDeclaration(String name) {
    return validateImportDeclaration(name,CompilerOptions.VERSION_1_3,CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given import declaration name for the given source and compliance levels.
   * <p>
   * The name of an import corresponds to a fully qualified type name
   * or an on-demand package name as defined by ImportDeclaration (JLS2 7.5).
   * For example, <code>"java.util.*"</code> or <code>"java.util.Hashtable"</code>.
   *
   * @param name the import declaration
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as an import declaration, otherwise a status
   *    object indicating what is wrong with the name
   * @since 3.3
   */
  public static IStatus validateImportDeclaration(String name, String sourceLevel, String complianceLevel) {
    if (name == null || name.length() == 0) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_import_nullImport, null);
    }
    if (name.charAt(name.length() - 1) == '*') {
      if (name.charAt(name.length() - 2) == '.') {
        return validatePackageName(name.substring(0, name.length() - 2), sourceLevel, complianceLevel);
      } else {
        return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_import_unqualifiedImport, null);
      }
    }
    return validatePackageName(name, sourceLevel, complianceLevel);
  }

  /**
   * Validate the given Java type name, either simple or qualified.
   * For example, <code>"java.lang.Object"</code>, or <code>"Object"</code>.
   * <p>
   *
   * @param name the name of a type
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a Java type name,
   *      a status with code <code>IStatus.WARNING</code>
   *    indicating why the given name is discouraged,
   *      otherwise a status object indicating what is wrong with
   *      the name
   * @deprecated Use {@link #validateJavaTypeName(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validateJavaTypeName(String name) {
    return validateJavaTypeName(name, CompilerOptions.VERSION_1_3,CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given Java type name, either simple or qualified, for the given source and compliance levels.
   * For example, <code>"java.lang.Object"</code>, or <code>"Object"</code>.
   * <p>
   *
   * @param name the name of a type
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a Java type name,
   *      a status with code <code>IStatus.WARNING</code>
   *    indicating why the given name is discouraged,
   *      otherwise a status object indicating what is wrong with
   *      the name
   * @since 3.3
   */
  public static IStatus validateJavaTypeName(String name, String sourceLevel, String complianceLevel) {
    if (name == null) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_type_nullName, null);
    }
    String trimmed = name.trim();
    if (!name.equals(trimmed)) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_type_nameWithBlanks, null);
    }
    int index = name.lastIndexOf('.');
    char[] scannedID;
    if (index == -1) {
      // simple name
      scannedID = scannedIdentifier(name, sourceLevel, complianceLevel);
    } else {
      // qualified name
      String pkg = name.substring(0, index).trim();
      IStatus status = validatePackageName(pkg, sourceLevel, complianceLevel);
      if (!status.isOK()) {
        return status;
      }
      String type = name.substring(index + 1).trim();
      scannedID = scannedIdentifier(type, sourceLevel, complianceLevel);
    }
 
    if (scannedID != null) {
      IStatus status = ResourcesPlugin.getWorkspace().validateName(new String(scannedID), IResource.FILE);
      if (!status.isOK()) {
        return status;
      }
      if (CharOperation.contains('$', scannedID)) {
        return new Status(IStatus.WARNING, JavaCore.PLUGIN_ID, -1, Messages.convention_type_dollarName, null);
      }
      if ((scannedID.length > 0 && ScannerHelper.isLowerCase(scannedID[0]))) {
        return new Status(IStatus.WARNING, JavaCore.PLUGIN_ID, -1, Messages.convention_type_lowercaseName, null);
      }
      return JavaModelStatus.VERIFIED_OK;
    } else {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.bind(Messages.convention_type_invalidName, name), null);
    }
  }

  /**
   * Validate the given method name.
   * The special names "&lt;init&gt;" and "&lt;clinit&gt;" are not valid.
   * <p>
   * The syntax for a method  name is defined by Identifier
   * of MethodDeclarator (JLS2 8.4). For example "println".
   *
   * @param name the name of a method
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a method name, otherwise a status
   *    object indicating what is wrong with the name
   * @deprecated Use {@link #validateMethodName(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validateMethodName(String name) {
    return validateMethodName(name, CompilerOptions.VERSION_1_3,CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given method name for the given source and compliance levels.
   * The special names "&lt;init&gt;" and "&lt;clinit&gt;" are not valid.
   * <p>
   * The syntax for a method  name is defined by Identifier
   * of MethodDeclarator (JLS2 8.4). For example "println".
   *
   * @param name the name of a method
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a method name, otherwise a status
   *    object indicating what is wrong with the name
   * @since 3.3
   */
  public static IStatus validateMethodName(String name, String sourceLevel, String complianceLevel) {
    return validateIdentifier(name, sourceLevel,complianceLevel);
  }

  /**
   * Validate the given package name.
   * <p>
   * The syntax of a package name corresponds to PackageName as
   * defined by PackageDeclaration (JLS2 7.4). For example, <code>"java.lang"</code>.
   * <p>
   * Note that the given name must be a non-empty package name (that is, attempting to
   * validate the default package will return an error status.)
   * Also it must not contain any characters or substrings that are not valid
   * on the file system on which workspace root is located.
   *
   * @param name the name of a package
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a package name, otherwise a status
   *    object indicating what is wrong with the name
   * @deprecated Use {@link #validatePackageName(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validatePackageName(String name) {
    return validatePackageName(name, CompilerOptions.VERSION_1_3,CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given package name for the given source and compliance levels.
   * <p>
   * The syntax of a package name corresponds to PackageName as
   * defined by PackageDeclaration (JLS2 7.4). For example, <code>"java.lang"</code>.
   * <p>
   * Note that the given name must be a non-empty package name (that is, attempting to
   * validate the default package will return an error status.)
   * Also it must not contain any characters or substrings that are not valid
   * on the file system on which workspace root is located.
   *
   * @param name the name of a package
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a package name, otherwise a status
   *    object indicating what is wrong with the name
   * @since 3.3
   */
  public static IStatus validatePackageName(String name, String sourceLevel, String complianceLevel) {

    if (name == null) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_package_nullName, null);
    }
    int length;
    if ((length = name.length()) == 0) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_package_emptyName, null);
    }
    if (name.charAt(0) == DOT || name.charAt(length-1) == DOT) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_package_dotName, null);
    }
    if (CharOperation.isWhitespace(name.charAt(0)) || CharOperation.isWhitespace(name.charAt(name.length() - 1))) {
      return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_package_nameWithBlanks, null);
    }
    int dot = 0;
    while (dot != -1 && dot < length-1) {
      if ((dot = name.indexOf(DOT, dot+1)) != -1 && dot < length-1 && name.charAt(dot+1) == DOT) {
        return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.convention_package_consecutiveDotsName, null);
        }
    }
    IWorkspace workspace = ResourcesPlugin.getWorkspace();
    StringTokenizer st = new StringTokenizer(name, "."); //$NON-NLS-1$
    boolean firstToken = true;
    IStatus warningStatus = null;
    while (st.hasMoreTokens()) {
      String typeName = st.nextToken();
      typeName = typeName.trim(); // grammar allows spaces
      char[] scannedID = scannedIdentifier(typeName, sourceLevel, complianceLevel);
      if (scannedID == null) {
        return new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.bind(Messages.convention_illegalIdentifier, typeName), null);
      }
      IStatus status = workspace.validateName(new String(scannedID), IResource.FOLDER);
      if (!status.isOK()) {
        return status;
      }
      if (firstToken && scannedID.length > 0 && ScannerHelper.isUpperCase(scannedID[0])) {
        if (warningStatus == null) {
          warningStatus = new Status(IStatus.WARNING, JavaCore.PLUGIN_ID, -1, Messages.convention_package_uppercaseName, null);
        }
      }
      firstToken = false;
    }
    if (warningStatus != null) {
      return warningStatus;
    }
    return JavaModelStatus.VERIFIED_OK;
  }
 
  /**
   * Validate a given classpath and output location for a project, using the following rules:
   * <ul>
   *   <li> Classpath entries cannot collide with each other; that is, all entry paths must be unique.
   *   <li> The project output location path cannot be null, must be absolute and located inside the project.
   *   <li> Specific output locations (specified on source entries) can be null, if not they must be located inside the project,
   *   <li> A project entry cannot refer to itself directly (that is, a project cannot prerequisite itself).
     *   <li> Classpath entries or output locations cannot coincidate or be nested in each other, except for the following scenarii listed below:
   *      <ul><li> A source folder can coincidate with its own output location, in which case this output can then contain library archives.
   *                     However, a specific output location cannot coincidate with any library or a distinct source folder than the one referring to it. </li>
   *              <li> A source/library folder can be nested in any source folder as long as the nested folder is excluded from the enclosing one. </li>
   *       <li> An output location can be nested in a source folder, if the source folder coincidates with the project itself, or if the output
   *           location is excluded from the source folder.
   *      </ul>
   * </ul>
   *
   *  Note that the classpath entries are not validated automatically. Only bound variables or containers are considered
   *  in the checking process (this allows to perform a consistency check on a classpath which has references to
   *  yet non existing projects, folders, ...).
   *  <p>
   *  This validation is intended to anticipate classpath issues prior to assigning it to a project. In particular, it will automatically
   *  be performed during the classpath setting operation (if validation fails, the classpath setting will not complete).
   *  <p>
   * @param javaProject the given java project
   * @param rawClasspath the given classpath
   * @param projectOutputLocation the given output location
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given classpath and output location are compatible, otherwise a status
   *    object indicating what is wrong with the classpath or output location
   * @since 2.0
   */
  public static IJavaModelStatus validateClasspath(IJavaProject javaProject, IClasspathEntry[] rawClasspath, IPath projectOutputLocation) {

    return ClasspathEntry.validateClasspath(javaProject, rawClasspath, projectOutputLocation);
  }

  /**
   * Returns a Java model status describing the problem related to this classpath entry if any,
   * a status object with code <code>IStatus.OK</code> if the entry is fine (that is, if the
   * given classpath entry denotes a valid element to be referenced onto a classpath).
   *
   * @param project the given java project
   * @param entry the given classpath entry
   * @param checkSourceAttachment a flag to determine if source attachement should be checked
   * @return a java model status describing the problem related to this classpath entry if any, a status object with code <code>IStatus.OK</code> if the entry is fine
   * @since 2.0
   */
  public static IJavaModelStatus validateClasspathEntry(IJavaProject project, IClasspathEntry entry, boolean checkSourceAttachment){
    IJavaModelStatus status = ClasspathEntry.validateClasspathEntry(project, entry, checkSourceAttachment, true/*recurse in container*/);
    if (status.getCode() == IJavaModelStatusConstants.INVALID_CLASSPATH && ((ClasspathEntry) entry).isOptional())
      return JavaModelStatus.VERIFIED_OK;
    return status;
  }
 
  /**
   * Validate the given type variable name.
   * <p>
   * Syntax of a type variable name corresponds to a Java identifier (JLS3 4.3).
   * For example, <code>"E"</code>.
   *
   * @param name the name of a type variable
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a type variable name, otherwise a status
   *    object indicating what is wrong with the name
   * @since 3.1
   * @deprecated Use {@link #validateTypeVariableName(String id, String sourceLevel, String complianceLevel)} instead
   */
  public static IStatus validateTypeVariableName(String name) {
    return validateIdentifier(name, CompilerOptions.VERSION_1_3,CompilerOptions.VERSION_1_3);
  }
 
  /**
   * Validate the given type variable name for the given source and compliance levels.
   * <p>
   * Syntax of a type variable name corresponds to a Java identifier (JLS3 4.3).
   * For example, <code>"E"</code>.
   *
   * @param name the name of a type variable
   * @param sourceLevel the source level
   * @param complianceLevel the compliance level
   * @return a status object with code <code>IStatus.OK</code> if
   *    the given name is valid as a type variable name, otherwise a status
   *    object indicating what is wrong with the name
   * @since 3.3
   */
  public static IStatus validateTypeVariableName(String name, String sourceLevel, String complianceLevel) {
    return validateIdentifier(name, sourceLevel, complianceLevel);
  }
 
  /**
   * Validate that all compiler options of the given project match keys and values
   * described in {@link JavaCore#getDefaultOptions()} method.
   *
   * @param javaProject the given java project
   * @param inheritJavaCoreOptions inherit project options from JavaCore or not.
   * @return a status object with code <code>IStatus.OK</code> if all project
   *    compiler options are valid, otherwise a status object indicating what is wrong
   *    with the keys and their value.
   * @since 3.1
   * TODO (frederic) finalize for all possible options (JavaCore, DefaultCodeFormatterOptions, AssistOptions) and open to API
   */
  /*
  public static IStatus validateCompilerOptions(IJavaProject javaProject, boolean inheritJavaCoreOptions)    {
    return validateCompilerOptions(javaProject.getOptions(inheritJavaCoreOptions));
  }
  */
 
  /**
   * Validate that all compiler options of the given project match keys and values
   * described in {@link JavaCore#getDefaultOptions()} method.
   *
   * @param compilerOptions Map of options
   * @return a status object with code <code>IStatus.OK</code> if all
   *    compiler options are valid, otherwise a status object indicating what is wrong
   *    with the keys and their value.
   * @since 3.1
   */
  /*
  public static IStatus validateCompilerOptions(Map compilerOptions)    {

    // Get current options
    String compliance = (String) compilerOptions.get(JavaCore.COMPILER_COMPLIANCE);
    String source = (String) compilerOptions.get(JavaCore.COMPILER_SOURCE);
    String target = (String) compilerOptions.get(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM);
    if (compliance == null && source == null && target == null) {
      return JavaModelStatus.VERIFIED_OK; // default is OK
    }
   
    // Initialize multi-status
    List errors = new ArrayList();
   
    // Set default for compliance if necessary (not set on project and not inherited...)
    if (compliance == null) {
      compliance = JavaCore.getOption(JavaCore.COMPILER_COMPLIANCE);
    }
   
    // Verify compliance level value and set source and target default if necessary
    long complianceLevel = 0;
    long sourceLevel = 0;
    long targetLevel = 0;
    if (JavaCore.VERSION_1_3.equals(compliance)) {
      complianceLevel = ClassFileConstants.JDK1_3;
      if (source == null) {
        source = JavaCore.VERSION_1_3;
        sourceLevel = ClassFileConstants.JDK1_3;
      }
      if (target == null) {
        target = JavaCore.VERSION_1_1;
        targetLevel = ClassFileConstants.JDK1_1;
      }
    } else if (JavaCore.VERSION_1_4.equals(compliance)) {
      complianceLevel = ClassFileConstants.JDK1_4;
      if (source == null) {
        source = JavaCore.VERSION_1_3;
        sourceLevel = ClassFileConstants.JDK1_3;
      }
      if (target == null) {
        target = JavaCore.VERSION_1_2;
        targetLevel = ClassFileConstants.JDK1_2;
      }
    } else if (JavaCore.VERSION_1_5.equals(compliance)) {
      complianceLevel = ClassFileConstants.JDK1_5;
      if (source == null) {
        source = JavaCore.VERSION_1_5;
        sourceLevel = ClassFileConstants.JDK1_5;
      }
      if (target == null) {
        target = JavaCore.VERSION_1_5;
        targetLevel = ClassFileConstants.JDK1_5;
      }
    } else {
      // compliance is not valid
      errors.add(new JavaModelStatus(IStatus.ERROR, Util.bind("convention.compiler.invalidCompilerOption", compliance==null?"":compliance, JavaCore.COMPILER_COMPLIANCE))); //$NON-NLS-1$ //$NON-NLS-2$
    }

    // Verify source value and set default for target if necessary
     if (JavaCore.VERSION_1_4.equals(source)) {
      sourceLevel = ClassFileConstants.JDK1_4;
      if (target == null) {
        target = JavaCore.VERSION_1_4;
        targetLevel = ClassFileConstants.JDK1_4;
      }
    } else if (JavaCore.VERSION_1_5.equals(source)) {
      sourceLevel = ClassFileConstants.JDK1_5;
      if (target == null) {
        target = JavaCore.VERSION_1_5;
        targetLevel = ClassFileConstants.JDK1_5;
      }
    } else if (JavaCore.VERSION_1_3.equals(source)) {
      sourceLevel = ClassFileConstants.JDK1_3;
    } else {
      // source is not valid
      errors.add(new JavaModelStatus(IStatus.ERROR, Util.bind("convention.compiler.invalidCompilerOption", source==null?"":source, JavaCore.COMPILER_SOURCE))); //$NON-NLS-1$ //$NON-NLS-2$
    }

    // Verify target value
     if (targetLevel == 0) {
       targetLevel = CompilerOptions.versionToJdkLevel(target);
       if (targetLevel == 0) {
        // target is not valid
        errors.add(new JavaModelStatus(IStatus.ERROR, Util.bind("convention.compiler.invalidCompilerOption", target==null?"":target, JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM))); //$NON-NLS-1$ //$NON-NLS-2$
       }
    }

    // Check and set compliance/source/target compatibilities (only if they have valid values)
    if (complianceLevel != 0 && sourceLevel != 0 && targetLevel != 0) {
      // target must be 1.5 if source is 1.5
      if (sourceLevel >= ClassFileConstants.JDK1_5 && targetLevel < ClassFileConstants.JDK1_5) {
        errors.add(new JavaModelStatus(IStatus.ERROR, Util.bind("convention.compiler.incompatibleTargetForSource", target, JavaCore.VERSION_1_5))); //$NON-NLS-1$
      }
         else
           // target must be 1.4 if source is 1.4
           if (sourceLevel >= ClassFileConstants.JDK1_4 && targetLevel < ClassFileConstants.JDK1_4) {
          errors.add(new JavaModelStatus(IStatus.ERROR, Util.bind("convention.compiler.incompatibleTargetForSource", target, JavaCore.VERSION_1_4))); //$NON-NLS-1$
         }
      // target cannot be greater than compliance level
      if (complianceLevel < targetLevel){
        errors.add(new JavaModelStatus(IStatus.ERROR, Util.bind("convention.compiler.incompatibleComplianceForTarget", compliance, JavaCore.VERSION_1_4))); //$NON-NLS-1$
      }
      // compliance must be 1.5 if source is 1.5
      if (source.equals(JavaCore.VERSION_1_5) && complianceLevel < ClassFileConstants.JDK1_5) {
        errors.add(new JavaModelStatus(IStatus.ERROR, Util.bind("convention.compiler.incompatibleComplianceForSource", compliance, JavaCore.VERSION_1_5))); //$NON-NLS-1$
      } else
        // compliance must be 1.4 if source is 1.4
        if (source.equals(JavaCore.VERSION_1_4) && complianceLevel < ClassFileConstants.JDK1_4) {
          errors.add(new JavaModelStatus(IStatus.ERROR, Util.bind("convention.compiler.incompatibleComplianceForSource", compliance, JavaCore.VERSION_1_4))); //$NON-NLS-1$
      }
    }

    // Return status
    int size = errors.size();
    switch (size) {
      case 0:
        return JavaModelStatus.VERIFIED_OK;
      case 1:
        return (IStatus) errors.get(0);
      default:
        IJavaModelStatus[] allStatus = new IJavaModelStatus[size];
        errors.toArray(allStatus);
        return JavaModelStatus.newMultiStatus(allStatus);
    }
  }
  */
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