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DomStack.java
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DomStack.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.Deque;
import java.util.LinkedList;
import java.util.NoSuchElementException;
import lombok.EqualsAndHashCode;
/**
* Stack of DOM cursors.
*
* <p>The class is mutable and thread-safe.
*
* @since 0.16
*/
@EqualsAndHashCode(of = "cursors")
final class DomStack implements Directive.Stack {
/**
* Queue of cursors.
*/
private final Deque<Directive.Cursor> cursors =
new LinkedList<>();
@Override
public void push(final Directive.Cursor cursor) {
synchronized (this.cursors) {
this.cursors.push(cursor);
}
}
@Override
public Directive.Cursor pop() throws ImpossibleModificationException {
synchronized (this.cursors) {
try {
return this.cursors.pop();
} catch (final NoSuchElementException ex) {
throw new ImpossibleModificationException(
"Stack is empty, can't POP", ex
);
}
}
}
}