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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.lib.jdbc;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
import org.apache.openjpa.lib.util.J2DoPrivHelper;
/*
* Lots of this could be abstracted out into a word-wrapping class.
*/
/**
* Converts single-line SQL strings into nicely-formatted
* multi-line, indented statements.
* Example: from PERSON t0, COMPANY t1 WHERE t0.ID = 10 AND \
* t0.COMPANY_ID = t1.ID AND t1.NAME = 'OpenJPA' becomes
* SELECT * FROM PERSON t0, COMPANY t1
* WHERE t0.ID = 10 AND t0.COMPANY_ID = t1.ID AND t1.NAME = 'OpenJPA'\
* and
* INSERT INTO PERSON VALUES('Patrick', 'Linskey', 'OpenJPA', \
* '202 595 2064 x1111') becomes
* INSERT INTO PERSON VALUES('Patrick', 'Linskey', 'OpenJPA', '202
* 595 2064 x1111') etc.
*
* @author Patrick Linskey
*/
public class SQLFormatter {
private boolean multiLine = false;
private boolean doubleSpace = true;
private String newline = J2DoPrivHelper.getLineSeparator();
private int lineLength = 72;
private String wrapIndent = " ";
private String clauseIndent = " ";
private static final String[] selectSeparators = new String[]{
"FROM ", "WHERE ", "ORDER BY ", // ### is this order correct?
"GROUP BY ", "HAVING ", };
private static final String[] insertSeparators = new String[]{
"VALUES ", };
private static final String[] updateSeparators = new String[]{
"SET ", "WHERE ", };
private static final String[] deleteSeparators = new String[]{
"WHERE ", };
private static final String[] createTableSeparators = new String[]{
"( ", };
private static final String[] createIndexSeparators = new String[]{
"ON ", "( ", };
public void setNewline(String val) {
newline = val;
}
public String getNewline() {
return newline;
}
public void setLineLength(int val) {
lineLength = val;
}
public int getLineLength() {
return lineLength;
}
public void setWrapIndent(String val) {
wrapIndent = val;
}
public String getWrapIndent() {
return wrapIndent;
}
public void setClauseIndent(String val) {
clauseIndent = val;
}
public String getClauseIndent() {
return clauseIndent;
}
/**
* If true, then try to parse multi-line SQL statements.
*/
public void setMultiLine(boolean multiLine) {
this.multiLine = multiLine;
}
/**
* If true, then try to parse multi-line SQL statements.
*/
public boolean getMultiLine() {
return this.multiLine;
}
/**
* If true, then output two lines after multi-line statements.
*/
public void setDoubleSpace(boolean doubleSpace) {
this.doubleSpace = doubleSpace;
}
/**
* If true, then output two lines after multi-line statements.
*/
public boolean getDoubleSpace() {
return this.doubleSpace;
}
public Object prettyPrint(Object sqlObject) {
if (!multiLine) {
return prettyPrintLine(sqlObject);
} else {
StringBuilder sql = new StringBuilder(sqlObject.toString());
StringBuilder buf = new StringBuilder(sql.length());
while (sql.length() > 0) {
String line = null;
int index = Math.max(sql.toString().indexOf(";\n"),
sql.toString().indexOf(";\r"));
if (index == -1)
line = sql.toString();
else
line = sql.substring(0, index + 2);
// remove the current line from the sql buffer
sql.delete(0, line.length());
buf.append(prettyPrintLine(line));
for (int i = 0; i < 1 + (getDoubleSpace() ? 1 : 0); i++)
buf.append(J2DoPrivHelper.getLineSeparator());
}
return buf.toString();
}
}
private Object prettyPrintLine(Object sqlObject) {
String sql = sqlObject.toString().trim();
String lowerCaseSql = sql.toLowerCase();
String[] separators;
if (lowerCaseSql.startsWith("select"))
separators = selectSeparators;
else if (lowerCaseSql.startsWith("insert"))
separators = insertSeparators;
else if (lowerCaseSql.startsWith("update"))
separators = updateSeparators;
else if (lowerCaseSql.startsWith("delete"))
separators = deleteSeparators;
else if (lowerCaseSql.startsWith("create table"))
separators = createTableSeparators;
else if (lowerCaseSql.startsWith("create index"))
separators = createIndexSeparators;
else
separators = new String[0];
int start = 0;
int end = -1;
StringBuilder clause;
List clauses = new ArrayList();
clauses.add(new StringBuilder());
for (int i = 0; i < separators.length; i++) {
end = lowerCaseSql.indexOf(" " + separators[i].toLowerCase(),
start);
if (end == -1)
break;
clause = clauses.get(clauses.size() - 1);
clause.append(sql.substring(start, end));
clause = new StringBuilder();
clauses.add(clause);
clause.append(clauseIndent);
clause.append(separators[i]);
start = end + 1 + separators[i].length();
}
clause = clauses.get(clauses.size() - 1);
clause.append(sql.substring(start));
StringBuilder pp = new StringBuilder(sql.length());
for (Iterator iter = clauses.iterator(); iter.hasNext();){
pp.append(wrapLine(iter.next().toString()));
if (iter.hasNext())
pp.append(newline);
}
return pp.toString();
}
private String wrapLine(String line) {
StringBuilder lines = new StringBuilder(line.length());
// ensure that any leading whitespace is preserved.
for (int i = 0; i < line.length() &&
(line.charAt(i) == ' ' || line.charAt(i) == '\t'); i++) {
lines.append(line.charAt(i));
}
StringTokenizer tok = new StringTokenizer(line);
int length = 0;
String elem;
while (tok.hasMoreTokens()) {
elem = tok.nextToken();
length += elem.length();
// if we would have exceeded the max, write out a newline
// before writing the elem.
if (length >= lineLength) {
lines.append(newline);
lines.append(wrapIndent);
lines.append(elem);
lines.append(' ');
length = wrapIndent.length() + elem.length() + 1;
continue;
}
// if the current length is greater than the max, then the
// last word alone was too long, so just write out a
// newline and move on.
if (elem.length() >= lineLength) {
lines.append(elem);
if (tok.hasMoreTokens())
lines.append(newline);
lines.append(wrapIndent);
length = wrapIndent.length();
continue;
}
lines.append(elem);
lines.append(' ');
length++;
}
return lines.toString();
}
public static void main(String [] args) {
SQLFormatter formatter = new SQLFormatter();
for (int i = 0; i < args.length; i++) {
System.out.println(formatter.prettyPrint(args[i]));
}
}
}
