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/*
* 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.jdbc.identifier;
import org.apache.commons.lang.StringUtils;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.lib.identifier.IdentifierConfiguration;
import org.apache.openjpa.lib.identifier.IdentifierRule;
import org.apache.openjpa.lib.identifier.IdentifierUtil;
/**
* Static utility class used for operating on string based identifiers.
*/
public class Normalizer {
private static IdentifierUtil normalizer =
new DBIdentifierUtilImpl(new DefaultIdentifierConfiguration());
private static IdentifierRule defaultRule;
static {
defaultRule = normalizer.getIdentifierConfiguration().getDefaultIdentifierRule();
}
public static IdentifierConfiguration getNamingConfiguration() {
return normalizer.getIdentifierConfiguration();
}
/**
* Normalizes a multi-part name
* @param name
* @return
*/
public static String normalizeMulti(String name) {
if (StringUtils.isEmpty(name)) {
return name;
}
String[] names = normalizer.splitName(defaultRule, name);
return normalizer.joinNames(defaultRule, names);
}
/**
* Normalizes a single part name
* @param name
* @return
*/
public static String normalizeString(String name) {
if (StringUtils.isEmpty(name)) {
return name;
}
if (!normalizer.isDelimited(defaultRule, name)) {
// If not delimited, delimit the string if necessary
return normalizer.delimit(defaultRule, name);
}
return name;
}
/**
* Returns true if the name is delimited with default delimiters
* @param name
* @return
*/
public static boolean isDelimited(String name) {
if (StringUtils.isEmpty(name)) {
return false;
}
return normalizer.isDelimited(defaultRule, name);
}
/**
* Splits names into individual components and compares individually
* for equality
* @param name1
* @param name2
* @return
*/
public static boolean fullNamesEqual(String name1, String name2) {
if (StringUtils.isEmpty(name1) && StringUtils.isEmpty(name2)) {
return true;
}
// Split multi-part names into individual components and compare
// each component. If delimited, do case compare.
String[] names1 = normalizer.splitName(defaultRule, name1);
String[] names2 = normalizer.splitName(defaultRule, name2);
if (names1.length != names2.length) {
return false;
}
for (int i = 0; i < names1.length; i++) {
if (normalizer.isDelimited(defaultRule, names1[i])) {
if (!StringUtils.equals(names1[i],names2[i])) {
return false;
}
} else {
if (!StringUtils.equalsIgnoreCase(names1[i],names2[i])) {
return false;
}
}
}
return true;
}
/**
* Compares two string names for equality. If delimited, does a
* case comparison. If not delimited, does a case insensitive
* comparison.
* @param name1
* @param name2
* @return
*/
public static boolean namesEqual(String name1, String name2) {
if (StringUtils.isEmpty(name1) && StringUtils.isEmpty(name2)) {
return true;
}
if (normalizer.isDelimited(defaultRule, name1)) {
if (!StringUtils.equals(name1, name2)) {
return false;
}
} else {
if (!StringUtils.equalsIgnoreCase(name1, name2)) {
return false;
}
}
return true;
}
/**
* Normalizes a name, if not delimited, converts to uppercase.
* @param name
* @return
*/
public static String normalizeUpper(String name) {
String nName = normalizeString(name);
// Do not convert delimited names to upper case. They may have
// been delimited to preserve case.
if (!isDelimited(nName)) {
nName = name.toUpperCase();
}
return nName;
}
/**
* Splits a name into normalized components
* @param name
* @return
*/
public static String[] splitName(String name) {
return normalizer.splitName(defaultRule, name);
}
/**
* Splits a name into normalized components using the specified
* name delimiter (ex. schema:table, delim = : --> { schema, table }
* @param name
* @return
*/
public static String[] splitName(String name, String delim) {
return normalizer.splitName(defaultRule, name, delim);
}
/**
* Joins multiple names using default identifier rules.
* @param names
* @return
*/
public static String joinNames(String[] names) {
return normalizer.joinNames(defaultRule, names);
}
/**
* Joins multiple names using the specified delimiter.
* @param names
* @return
*/
public static String joinNames(String[] names, String delimiter) {
return normalizer.joinNames(defaultRule, names, delimiter);
}
/**
* Joins two names using the default identifier rules.
* @param names
* @return
*/
public static String joinNames(String name1, String name2) {
return joinNames(new String[] { name1, name2});
}
/**
* Truncates a name to the specified length while maintaining
* delimiters.
* @param name
* @param length
* @return
*/
public static String truncate(String name, int length) {
return normalizer.truncateName(defaultRule, name, length);
}
/**
* Convert a normalized name to a name using the specified configuration and
* naming rule.
* Note: Currently only delimiters are converted.
* @param config
* @param rule
* @param name
* @return
*/
public static String convert(IdentifierConfiguration config, String rule, String name) {
return normalizer.convert(config, rule, name);
}
/**
* Combines two names using default identifier rules.
* @param name1
* @param name2
* @return
*/
public static String combine(String name1, String name2) {
return normalizer.combineNames(defaultRule, name1, name2);
}
/**
* Combines multiple names using default identifier rules.
* @param name1
* @param name2
* @return
*/
public static String combine(String...names) {
return normalizer.combineNames(defaultRule, names);
}
/**
* Appends one string to another using default identifier rules.
* @param name1
* @param name2
* @return
*/
public static String append(String name1, String name2) {
return normalizer.appendNames(defaultRule, name1, name2);
}
/**
* Removes Hungarian notation from a string.
* @param name1
* @param name2
* @return
*/
public static String removeHungarianNotation(String name) {
return normalizer.removeHungarianNotation(defaultRule, name);
}
/**
* Removes default delimiters from a string.
* @param name1
* @param name2
* @return
*/
public static String removeDelimiters(String name) {
return normalizer.removeDelimiters(defaultRule, name);
}
/**
* Delimits a string if necessary, optionally forcing it to be
* delimited.
* @param name1
* @param name2
* @return
*/
public static String delimit(String name, boolean force) {
return normalizer.delimit(defaultRule, name, force);
}
/**
* Determines whether a name can be split into multiple components.
* @param name1
* @param name2
* @return
*/
public static boolean canSplit(String name) {
return normalizer.canSplit(defaultRule, name);
}
/**
* Determines whether a name can be split into multiple components, taking
* into account the specified delimiter.
* @param name1
* @param name2
* @return
*/
public static boolean canSplit(String name, String delim) {
return normalizer.canSplit(defaultRule, name, delim);
}
}
