/* * Copyright 2008 Fedora Commons * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.mulgara.sparql.parser.cst; /** * Object for representing RDF blank nodes. * This will be emitted as a variable for use in queries. * * @created February 11, 2008 * @author Paula Gearon * @copyright © 2008 <a href="http://www.fedora-commons.org/">Fedora Commons</a> * @licence <a href="{@docRoot}/../LICENCE.txt">Apache License, Version 2.0</a> */ public class BlankNode implements Node { private String label; /** * Creates a blank node with a given label * @param s The string containing the label */ public BlankNode(String s) { label = s; } /** * Get the label for this node. * @return The label for this node. */ public String getLabel() { return label; } /** * Get a printable representation of this class. * @see org.mulgara.sparql.parser.cst.Node#getImage() */ public String getImage() { return label; } /** * Check if this BlankNode is equivalent to another. * @param o The other BlankNode * @return <code>true</code> iff o is a BlankNode, and has the same label. * @see java.lang.Object#equals(java.lang.Object) */ public boolean equals(Object o) { return (o instanceof BlankNode && ((BlankNode)o).label.equals(label)); } /** @see java.lang.Object#hashCode() */ public int hashCode() { return label.hashCode(); } }