| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.openjpa.lib.identifier; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.openjpa.lib.util.StringUtil; |
| |
| /** |
| * The standard identifier rule. Rules are used for specific configuration |
| * of identifier types. For example. A rule could be used to indicate that |
| * an identifier type should not be delimited or has a max length of 255 |
| * characters. |
| * |
| */ |
| public class IdentifierRule { |
| |
| public static final Set<String> EMPTY_SET = new HashSet<>(0); |
| public static final String DEFAULT_RULE = "default"; |
| public static char UNDERSCORE = '_'; |
| |
| private String _name; |
| private int _maxLength = 128; |
| private boolean _nullable = false; |
| private boolean _allowTruncation = false; |
| private boolean _allowCompaction = true; |
| private boolean _canDelimit = true; |
| private boolean _mustDelimit = false; |
| private boolean _mustBeginWithLetter = true; |
| private boolean _onlyLettersDigitsUnderscores = true; |
| private String _specialCharacters = ""; |
| private Set<String> _reservedWords = null; |
| private boolean _delimitReservedWords = false; |
| private String _wildcard = "%"; |
| |
| public void setName(String name) { |
| _name = name; |
| } |
| |
| public String getName() { |
| return _name; |
| } |
| |
| public void setMaxLength(int maxLength) { |
| _maxLength = maxLength; |
| } |
| |
| public int getMaxLength() { |
| return _maxLength; |
| } |
| |
| public void setAllowTruncation(boolean allowTruncation) { |
| _allowTruncation = allowTruncation; |
| } |
| |
| public boolean isAllowTruncation() { |
| return _allowTruncation; |
| } |
| |
| public void setNullable(boolean nullable) { |
| _nullable = nullable; |
| } |
| |
| public boolean isNullable() { |
| return _nullable; |
| } |
| |
| public void setAllowCompaction(boolean allowCompaction) { |
| _allowCompaction = allowCompaction; |
| } |
| |
| public boolean getAllowCompaction() { |
| return _allowCompaction; |
| } |
| |
| public void setCanDelimit(boolean canDelimit) { |
| _canDelimit = canDelimit; |
| } |
| |
| public boolean getCanDelimit() { |
| return _canDelimit; |
| } |
| |
| public void setMustDelimit(boolean mustDelimit) { |
| _mustDelimit = mustDelimit; |
| } |
| |
| public boolean getMustDelimit() { |
| return _mustDelimit; |
| } |
| |
| public void setMustBeginWithLetter(boolean mustBeginWithLetter) { |
| _mustBeginWithLetter = mustBeginWithLetter; |
| } |
| |
| public boolean isMustBeginWithLetter() { |
| return _mustBeginWithLetter; |
| } |
| |
| public void setOnlyLettersDigitsUnderscores(boolean onlyLettersDigitsUnderscores) { |
| _onlyLettersDigitsUnderscores = onlyLettersDigitsUnderscores; |
| } |
| |
| public boolean isOnlyLettersDigitsUnderscores() { |
| return _onlyLettersDigitsUnderscores; |
| } |
| |
| public void setReservedWords(Set<String> reservedWords) { |
| _reservedWords = reservedWords; |
| } |
| |
| public Set<String> getReservedWords() { |
| if (_reservedWords == null) { |
| _reservedWords = new HashSet<>(); |
| } |
| return _reservedWords; |
| } |
| |
| public void setSpecialCharacters(String specialCharacters) { |
| _specialCharacters = specialCharacters; |
| } |
| |
| public String getSpecialCharacters() { |
| return _specialCharacters; |
| } |
| |
| public void setDelimitReservedWords(boolean delimitReservedWords) { |
| _delimitReservedWords = delimitReservedWords; |
| } |
| |
| public boolean getDelimitReservedWords() { |
| return _delimitReservedWords; |
| } |
| |
| /** |
| * SQL identifier rules: |
| * 1) Can be up to 128 characters long |
| * 2) Must begin with a letter |
| * 3) Can contain letters, digits, and underscores |
| * 4) Can't contain spaces or special characters such as #, $, &, %, or |
| * punctuation. |
| * 5) Can't be reserved words |
| */ |
| public boolean requiresDelimiters(String identifier) { |
| |
| // Do not delimit single valued wildcards or "?" or names that have method-type |
| // signatures (ex. getValue()). These are considered special values in OpenJPA |
| // and should not be delimited. |
| if (_wildcard.equals(identifier) || "?".equals(identifier) || |
| identifier.endsWith("()")) { |
| return false; |
| } |
| |
| if (getMustDelimit()) { |
| return true; |
| } |
| |
| // Assert identifier begins with a letter |
| char[] chars = identifier.toCharArray(); |
| if (isMustBeginWithLetter()) { |
| if (!Character.isJavaIdentifierStart(chars[0])) { |
| return true; |
| } |
| } |
| |
| // Iterate through chars, asserting delimiting rules |
| for (char ch : chars) { |
| if (isOnlyLettersDigitsUnderscores()) { |
| if (!Character.isJavaIdentifierPart(ch) && !(ch == UNDERSCORE)) { |
| return true; |
| } |
| } |
| // Look for special characters |
| if (StringUtil.contains(getSpecialCharacters(), ch)) { |
| return true; |
| } |
| } |
| // Finally, look for reserved words |
| if (getDelimitReservedWords()) { |
| if (isReservedWord(identifier)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public boolean isReservedWord(String identifier) { |
| return _reservedWords.contains(identifier); |
| } |
| } |