/**
 * Copyright (c) 2014-2015, Thindeck.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 thindeck.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
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.thindeck.agents;

import com.google.common.base.Joiner;
import com.jcabi.aspects.Immutable;
import com.jcabi.log.Logger;
import com.jcabi.xml.XML;
import com.thindeck.api.Agent;
import org.xembly.Directive;
import org.xembly.Directives;

/**
 * Swap BLUE and GREEN containers.
 *
 * @author Yegor Bugayenko (yegor@teamed.io)
 * @version $Id$
 * @since 0.1
 * @checkstyle MultipleStringLiteralsCheck (500 lines)
 */
@Immutable
public final class Swap implements Agent {

    @Override
    public Iterable<Directive> exec(final XML deck) {
        final boolean ready = !deck.nodes(
            Joiner.on(" and ").join(
                "/deck/containers[not(container/@waste='true')",
                "not(container/@state='dead')",
                "container/@type='green'",
                "container/@type='blue']"
            )
        ).isEmpty();
        final Directives dirs = new Directives();
        if (ready) {
            dirs.xpath("/deck/containers/container[@type='blue']")
                .attr("type", "green")
                .xpath("/deck/containers/container[@type='green']")
                .attr("type", "blue")
                .attr("waste", "true");
            Logger.info(this, "swapped blue vs green containers");
        }
        return dirs;
    }
}

@@ -2286,17 +2286,17 @@
 ontainer
-/
+%5B
 @state='
@@ -2300,16 +2300,34 @@
 e='dead'
+ and @type='blue'%5D
 )%22,%0A    
@@ -2331,32 +2331,36 @@
                %22
+not(
 container/@type=
@@ -2356,22 +2356,44 @@
 iner
-/@type='green'
+%5B@state='unknown' and @type='blue'%5D)
 %22,%0A 

Swap fix