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*
* // Copyright (c) 1998, 2007, Oracle. All rights reserved.
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*
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* and Distribution License("CDDL") (collectively, the "License"). You
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*
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* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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*/
package oracle.toplink.essentials.internal.helper;
import java.util.regex.Pattern;
import java.util.Hashtable;
/**
* INTERNAL:
* Implements operations specific to JDK 1.5
*/
public class JDK15Platform implements JDKPlatform {
/**
* INTERNAL
* Get the Map to store the query cache in
*/
public java.util.Map getQueryCacheMap() {
return new java.util.concurrent.ConcurrentHashMap();
}
/**
* PERF: The regular expression compiled Pattern objects are cached
* to avoid recompilation on every usage.
*/
protected static Hashtable patternCache = new Hashtable();
/**
* INTERNAL:
* An implementation of in memory queries with Like which uses the JDK 1.4
* regular expression framework.
*/
public int conformLike(Object left, Object right) {
if ((left == null) && (right == null)) {
return JavaPlatform.TRUE;
} else if ((left == null) || (right == null)) {
return JavaPlatform.FALSE;
}
if (left instanceof String && right instanceof String) {
// PERF: First check the pattern cache for the pattern.
// Note that the original string is the key, to avoid having to translate it first.
Pattern pattern = (Pattern)patternCache.get(right);
if (pattern == null) {
// Bug 3936427 - Replace regular expression reserved characters with escaped version of those characters
// For instance replace ? with \?
String convertedRight = ((String)right).replaceAll("\\?", "\\\\?");
convertedRight = convertedRight.replaceAll("\\*", "\\\\*");
convertedRight = convertedRight.replaceAll("\\.", "\\\\.");
convertedRight = convertedRight.replaceAll("\\[", "\\\\[");
convertedRight = convertedRight.replaceAll("\\)", "\\\\)");
convertedRight = convertedRight.replaceAll("\\(", "\\\\(");
convertedRight = convertedRight.replaceAll("\\{", "\\\\{");
convertedRight = convertedRight.replaceAll("\\+", "\\\\+");
convertedRight = convertedRight.replaceAll("\\^", "\\\\^");
convertedRight = convertedRight.replaceAll("\\|", "\\\\|");
// regular expressions to substitute SQL wildcards with regex wildcards
// replace "%" which is not preceded by "\" with ".*"
convertedRight = convertedRight.replaceAll("([^\\\\])%", "$1.*");
// replace "_" which is not preceded by "\" with ".
convertedRight = convertedRight.replaceAll("([^\\\\])_", "$1.");
// deal with wildcards at the beginning of a line.
convertedRight = convertedRight.replaceAll("^%", ".*");
convertedRight = convertedRight.replaceAll("^_", ".");
// replace "\%" with "%"
convertedRight = convertedRight.replaceAll("\\\\%", "%");
// replace "\_" with "_"
convertedRight = convertedRight.replaceAll("\\\\_", "_");
pattern = Pattern.compile(convertedRight);
// Ensure cache does not grow beyond 100.
if (patternCache.size() > 100) {
patternCache.remove(patternCache.keySet().iterator().next());
}
patternCache.put(right, pattern);
}
boolean match = pattern.matcher((String)left).matches();
if (match) {
return JavaPlatform.TRUE;
} else {
return JavaPlatform.FALSE;
}
}
return JavaPlatform.UNDEFINED;
}
/**
* INTERNAL:
* Get the milliseconds from a Calendar. In JDK 1.4, this can be accessed directly from the calendar.
*/
public long getTimeInMillis(java.util.Calendar calendar) {
return calendar.getTimeInMillis();
}
/**
* INTERNAL:
* Set the milliseconds for a Calendar. In JDK 1.4, this can be set directly in the calendar.
*/
public void setTimeInMillis(java.util.Calendar calendar, long millis) {
calendar.setTimeInMillis(millis);
}
/**
* INTERNAL:
* Use API first available in JDK 1.4 to set the cause of an exception.
*/
public void setExceptionCause(Throwable exception, Throwable cause) {
if (exception.getCause() == null) {
exception.initCause(cause);
}
}
/**
* INTERNAL
* return a boolean which determines where TopLink should include the TopLink-stored
* Internal exception in it's stack trace. For JDK 1.4 VMs with exception chaining
* the Internal exception can be redundant and confusing.
* @return boolean will return false since JDK 1.4 does supports exception chaining
*/
public boolean shouldPrintInternalException() {
return false;
}
}
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