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StrictDirective.java
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StrictDirective.java
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/**
* Copyright (c) 2013-2019, xembly.org
* 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 xembly.org 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 org.xembly;
import lombok.EqualsAndHashCode;
import org.w3c.dom.Node;
/**
* STRICT directive.
*
* <p>The class is immutable and thread-safe.
*
* @author Yegor Bugayenko (yegor256@gmail.com)
* @version $Id$
* @since 0.3
*/
@EqualsAndHashCode(of = "number")
final class StrictDirective implements Directive {
/**
* Number of nodes we're expecting.
*/
private final transient int number;
/**
* Public ctor.
* @param nodes Number of node expected
*/
StrictDirective(final int nodes) {
this.number = nodes;
}
@Override
public String toString() {
return String.format("STRICT \"%d\"", this.number);
}
@Override
public Directive.Cursor exec(final Node dom,
final Directive.Cursor cursor, final Directive.Stack stack)
throws ImpossibleModificationException {
if (cursor.size() != this.number) {
if (cursor.isEmpty()) {
throw new ImpossibleModificationException(
String.format(
"no current nodes while %d expected", this.number
)
);
}
if (cursor.size() == 1) {
throw new ImpossibleModificationException(
String.format(
"one current node '%s' while strictly %d expected",
cursor.iterator().next().getNodeName(), this.number
)
);
}
throw new ImpossibleModificationException(
String.format(
"%d current nodes [%s] while strictly %d expected",
cursor.size(), this.names(cursor), this.number
)
);
}
return cursor;
}
/**
* Get node names as a string.
* @param nodes Collection of nodes
* @return Text presentation of them
*/
private String names(final Iterable<Node> nodes) {
final StringBuilder text = new StringBuilder(0);
for (final Node node : nodes) {
if (text.length() > 0) {
text.append(", ");
}
final Node parent = node.getParentNode();
if (parent != null) {
text.append(parent.getNodeName());
}
text.append('/').append(node.getNodeName());
}
return text.toString();
}
}