netbout-spi-1.5.6.src.main.java.com.netbout.spi.Query Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2012, Netbout.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the NetBout.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.netbout.spi;
import java.util.regex.Pattern;
/**
* Query.
*
* Instances of this interface must be thread-safe.
*
* @author Yegor Bugayenko ([email protected])
* @version $Id: Query.java 3526 2012-10-30 07:30:27Z guard $
* @checkstyle InterfaceIsType (500 lines)
*/
public interface Query {
/**
* Pattern to match special queries.
*/
Pattern FORMATTED = Pattern.compile("\\s*\\(.*\\)\\s*", Pattern.DOTALL);
/**
* Simple textual implementation of it.
*/
class Textual implements Query {
/**
* Text of the query.
*/
private final transient String text;
/**
* Public ctor.
* @param txt The text of it
*/
public Textual(final String txt) {
this.text = Query.Textual.normalize(txt);
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return this.text;
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(final Object query) {
return query == this || (query instanceof Query
&& this.toString().equals(query.toString()));
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
return this.toString().hashCode();
}
/**
* Normalize query.
* @param query The query to normalize
* @return Normalized query
*/
private static String normalize(final String query) {
String normalized;
if (query == null) {
normalized = Query.Textual.normalize("");
} else if (Query.FORMATTED.matcher(query).matches()) {
normalized = query.trim();
} else {
normalized = String.format(
"(matches '%s')",
query.replace("'", "\\'")
);
}
return normalized;
}
}
}