001: /*
002: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Kernel/Sources/es/udc/mypersonalizer/kernel/model/query/ast/Step.java,v 1.1.1.1 2004/03/25 12:08:37 fbellas Exp $
003: * $Revision: 1.1.1.1 $
004: * $Date: 2004/03/25 12:08:37 $
005: *
006: * =============================================================================
007: *
008: * Copyright (c) 2003, The MyPersonalizer Development Group
009: * (http://www.tic.udc.es/~fbellas/mypersonalizer/index.html) at
010: * University Of A Coruņa
011: * All rights reserved.
012: *
013: * Redistribution and use in source and binary forms, with or without
014: * modification, are permitted provided that the following conditions are met:
015: *
016: * - Redistributions of source code must retain the above copyright notice,
017: * this list of conditions and the following disclaimer.
018: *
019: * - Redistributions in binary form must reproduce the above copyright notice,
020: * this list of conditions and the following disclaimer in the documentation
021: * and/or other materials provided with the distribution.
022: *
023: * - Neither the name of the University Of A Coruņa nor the names of its
024: * contributors may be used to endorse or promote products derived from
025: * this software without specific prior written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
028: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
029: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
030: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
031: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
032: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
033: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
034: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
035: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
036: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
037: * POSSIBILITY OF SUCH DAMAGE.
038: *
039: */
040:
041: package es.udc.mypersonalizer.kernel.model.query.ast;
042:
043: import es.udc.mypersonalizer.kernel.model.metainfo.MetaProperty;
044: import es.udc.mypersonalizer.kernel.model.query.ast.expr.BooleanExpression;
045:
046: /**
047: * A reference to a <code>MetaProperty</code>, with (possibly) some expressions
048: * to select only a subset of its <code>Property</code> objects.
049: * <p>
050: * <code>Step</code>s can also reference <code>MetaService</code>s. In this
051: * case, its root property should be used.
052: *
053: * @see es.udc.mypersonalizer.kernel.model.metainfo.MetaProperty
054: * @see es.udc.mypersonalizer.kernel.model.metainfo.MetaService
055: * @since 1.0
056: * @author Abel Muinho
057: */
058: public class Step {
059:
060: /** The <code>MetaProperty</code> referenced by this <code>Step</code>
061: */
062: private MetaProperty metaProperty;
063:
064: /** The selection criterium for this <code>Step</code>. */
065: private BooleanExpression expression;
066:
067: /**
068: * Obtains <code>MetaProperty</code> referenced by this <code>Step</code>
069: * @return the <code>MetaProperty</code>.
070: */
071: public MetaProperty getMetaProperty() {
072: return metaProperty;
073: }
074:
075: /**
076: * Sets the name of the <code>MetaService</code> or
077: * <code>MetaProperty</code> referenced by this <code>Step</code>
078: * @param metaProperty the <code>MetaProperty</code>.
079: */
080: public void setMetaProperty(MetaProperty metaProperty) {
081: this .metaProperty = metaProperty;
082: }
083:
084: /**
085: * Obtains the predicate to be applied to this step.
086: * @return this step's filter.
087: */
088: public BooleanExpression getExpression() {
089: return expression;
090: }
091:
092: /**
093: * Sets the predicate to be applied to this step.
094: * @param e this step's filter.
095: */
096: public void setExpression(BooleanExpression e) {
097: this.expression = e;
098: }
099:
100: }
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