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XattrDirective.java
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XattrDirective.java
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/*
* Copyright (c) 2013-2024, 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 java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import lombok.EqualsAndHashCode;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* XATTR directive.
*
* <p>The class is immutable and thread-safe.
*
* @since 0.28
*/
@EqualsAndHashCode(of = "expr")
final class XattrDirective implements Directive {
/**
* XPath factory.
*/
private static final XPathFactory FACTORY = XPathFactory.newInstance();
/**
* Attribute name.
*/
private final Arg name;
/**
* XPath to use.
*/
private final Arg expr;
/**
* Public ctor.
* @param attr Name of the attr
* @param val Text value to set
* @throws XmlContentException If invalid input
*/
XattrDirective(final String attr, final String val) throws XmlContentException {
this.name = new Arg(attr);
this.expr = new Arg(val);
}
@Override
public String toString() {
return String.format("XATTR %s, %s", this.name, this.expr);
}
@Override
public Cursor exec(final Node dom,
final Cursor cursor, final Stack stack)
throws ImpossibleModificationException {
final ConcurrentMap<Node, String> values =
new ConcurrentHashMap<>(0);
final XPath xpath = XattrDirective.FACTORY.newXPath();
for (final Node node : cursor) {
try {
values.put(
node,
xpath.evaluate(
this.expr.raw(), node, XPathConstants.STRING
).toString()
);
} catch (final XPathExpressionException ex) {
throw new ImpossibleModificationException(
String.format("Invalid XPath expr '%s'", this.expr), ex
);
}
}
for (final Map.Entry<Node, String> entry : values.entrySet()) {
Element.class.cast(entry.getKey()).setAttribute(
this.name.raw(), entry.getValue()
);
}
return cursor;
}
}