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/**
 * Copyright (c) 2009-2012, Netbout.com
 * All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
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 * 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
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 */
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; } } }





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