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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.kernel.exps;
import java.util.Map;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.exps.ExpressionVisitor;
import org.apache.openjpa.kernel.exps.Parameter;
import serp.util.Strings;
/**
* Test if a string matches a regexp.
*
* @author Abe White
*/
class MatchesExpression
implements Exp {
private final Val _val;
private final Const _const;
private final String _single;
private final String _multi;
private final String _escape;
/**
* Constructor. Supply values.
*/
public MatchesExpression(Val val, Const con,
String single, String multi, String escape) {
_val = val;
_const = con;
_single = single;
_multi = multi;
_escape = escape;
}
public ExpState initialize(Select sel, ExpContext ctx, Map contains) {
ExpState s1 = _val.initialize(sel, ctx, 0);
ExpState s2 = _const.initialize(sel, ctx, 0);
return new BinaryOpExpState(sel.and(s1.joins, s2.joins), s1, s2);
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer buf) {
BinaryOpExpState bstate = (BinaryOpExpState) state;
_val.calculateValue(sel, ctx, bstate.state1, _const, bstate.state2);
_const.calculateValue(sel, ctx, bstate.state2, _val, bstate.state1);
Column col = null;
if (_val instanceof PCPath) {
Column[] cols = ((PCPath) _val).getColumns(bstate.state1);
if (cols.length == 1)
col = cols[0];
}
Object o = _const.getValue(ctx, bstate.state2);
if (o == null)
buf.append("1 <> 1");
else {
// look for ignore case flag and strip it out if present
boolean ignoreCase = false;
String str = o.toString();
int idx = str.indexOf("(?i)");
if (idx != -1) {
ignoreCase = true;
if (idx + 4 < str.length())
str = str.substring(0, idx) + str.substring(idx + 4);
else
str = str.substring(0, idx);
str = str.toLowerCase();
}
// append target
if (ignoreCase)
buf.append("LOWER(");
_val.appendTo(sel, ctx, bstate.state1, buf, 0);
if (ignoreCase)
buf.append(")");
// create a DB wildcard string by replacing the
// multi token (e.g., '.*') and the single token (e.g., ".")
// with '%' and '.' with '_'
str = replaceEscape(str, _multi, "%", _escape);
str = replaceEscape(str, _single, "_", _escape);
buf.append(" LIKE ").appendValue(str, col,
_const instanceof Parameter ? (Parameter)_const : null);
// escape out characters by using the database's escape sequence
DBDictionary dict = ctx.store.getDBDictionary();
if (_escape != null) {
if (_escape.equals("\\"))
buf.append(" ESCAPE '").append(dict.searchStringEscape).append("'");
else
buf.append(" ESCAPE '").append(_escape).append("'");
}
}
sel.append(buf, state.joins);
}
/**
* Perform a string replacement with simplistic escape handing.
*
* @param str the source string
* @param from the string to find
* @param to the string to replace
* @param escape the string to use to escape replacement
* @return the replaced string
*/
private static String replaceEscape(String str, String from, String to,
String escape) {
String[] parts = Strings.split(str, from, Integer.MAX_VALUE);
StringBuilder repbuf = new StringBuilder();
for (int i = 0; i < parts.length; i++) {
if (i > 0) {
// if the previous part ended with an escape character, then
// escape the character and remove the previous escape;
// this doesn't support any double-escaping or other more
// sophisticated features
if (!from.equals(to) && parts[i - 1].endsWith(escape)) {
repbuf.setLength(repbuf.length() - 1);
repbuf.append(from);
} else
repbuf.append(to);
}
repbuf.append(parts[i]);
}
return repbuf.toString();
}
public void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
BinaryOpExpState bstate = (BinaryOpExpState) state;
_val.selectColumns(sel, ctx, bstate.state1, true);
_const.selectColumns(sel, ctx, bstate.state2, true);
}
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_val.acceptVisit(visitor);
_const.acceptVisit(visitor);
visitor.exit(this);
}
}
