/**
* Licensed to JumpMind Inc under one or more contributor
* license agreements. See the NOTICE file distributed
* with this work for additional information regarding
* copyright ownership. JumpMind Inc licenses this file
* to you under the GNU General Public License, version 3.0 (GPLv3)
* (the "License"); you may not use this file except in compliance
* with the License.
*
* You should have received a copy of the GNU General Public License,
* version 3.0 (GPLv3) along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* 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.jumpmind.db.sql;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Reader;
import java.util.Map;
import org.apache.commons.lang.StringUtils;
import org.jumpmind.exception.IoException;
import org.jumpmind.util.FormatUtils;
/**
* Provides an interface to read each SQL statement in a SQL script.
*/
public class SqlScriptReader extends LineNumberReader implements ISqlStatementSource {
static final char COMMENT_CHARS[] = { '-', '#', '/' };
public final static String QUERY_ENDS = ";";
private String delimiter = QUERY_ENDS;
private Map<String, String> replacementTokens;
private boolean usePrefixSuffixForReplacementTokens = false;
public SqlScriptReader(Reader in) {
super(in);
}
public void setUsePrefixSuffixForReplacementTokens(boolean usePrefixSuffixForReplacementTokens) {
this.usePrefixSuffixForReplacementTokens = usePrefixSuffixForReplacementTokens;
}
public boolean isUsePrefixSuffixForReplacementTokens() {
return usePrefixSuffixForReplacementTokens;
}
public void setDelimiter(String delimiter) {
this.delimiter = delimiter;
}
public String getDelimiter() {
return delimiter;
}
public void setReplacementTokens(Map<String, String> replacementTokens) {
this.replacementTokens = replacementTokens;
}
public Map<String, String> getReplacementTokens() {
return replacementTokens;
}
public String readSqlStatement() {
try {
String line = readLine();
StringBuilder sql = null;
if (line != null) {
do {
line = trimComments(line);
if (sql == null) {
sql = new StringBuilder();
}
sql.append("\n");
sql.append(line);
if (checkStatementEnds(sql.toString())) {
String toExecute = sql.substring(0, sql.lastIndexOf(delimiter));
toExecute = prepareForExecute(toExecute);
if (StringUtils.isNotBlank(toExecute)) {
return toExecute;
} else {
sql.setLength(0);
}
}
line = readLine();
} while (line != null);
String toExecute = sql.toString();
if (StringUtils.isNotBlank(toExecute)) {
return prepareForExecute(toExecute);
} else {
return null;
}
} else {
return null;
}
} catch (IOException ex) {
throw new IoException(ex);
}
}
protected String prepareForExecute(String toExecute) {
toExecute = FormatUtils.replaceTokens(toExecute, replacementTokens,
usePrefixSuffixForReplacementTokens);
if (StringUtils.isNotBlank(toExecute)) {
return toExecute.trim();
} else {
return null;
}
}
protected String trimComments(String line) {
char[] content = line.toCharArray();
for (int i = 0; i < line.length(); i++) {
if (!betweenOccurences('\'', i, content)
&& !betweenOccurences('"', i, content)
&& !betweenOccurences('`', i, content)) {
for (char c : COMMENT_CHARS) {
if (c == content[i]) {
if (i + 1 < content.length && content[i + 1] == c) {
return line.substring(0, i);
}
if (i > 0 && content[i - 1] == c) {
return line.substring(0, i - 1);
}
}
}
}
}
return line;
}
protected boolean betweenOccurences(char q, int i, char[] content) {
boolean startFound = false;
for (int j = 0; j < content.length; j++) {
if (content[j] == q)
if (j < i) {
startFound = !startFound;
} else if (j > i) {
return startFound;
}
}
return false;
}
protected boolean inQuotedArea(String s) {
return StringUtils.countMatches(s, "'") % 2 != 0
|| StringUtils.countMatches(s, "\"") % 2 != 0
|| StringUtils.countMatches(s, "`") % 2 != 0;
}
protected boolean checkStatementEnds(String s) {
return s.trim().endsWith("" + delimiter) && !inQuotedArea(s);
}
}