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/** |
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$Id$ |
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Copyright (C) 2007 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.jep.convert; |
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import net.sf.basedb.core.query.Expression; |
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import net.sf.basedb.core.query.Restriction; |
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import net.sf.basedb.core.query.Restrictions; |
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import net.sf.basedb.util.jep.Jep; |
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import org.nfunk.jep.ASTConstant; |
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import org.nfunk.jep.Node; |
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|
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/** |
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Convert the '==' operator |
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to a Query API {@link Restriction}. |
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@author nicklas |
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@version 2.4 |
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@base.modified $Date$ |
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*/ |
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public class EqualsConverter |
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extends AbstractJepConversionFunction<Node> |
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{ |
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|
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public EqualsConverter() |
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{} |
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|
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/* |
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From the JepConversionFunction interface |
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------------------------------------------- |
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*/ |
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@Override |
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public boolean isOperator() |
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{ |
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return true; |
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} |
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/** |
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@return The string '==' |
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*/ |
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@Override |
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public String getName() |
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{ |
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return "=="; |
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} |
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@Override |
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public String getDescription() |
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{ |
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return "Check if two expressions are equal"; |
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} |
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/** |
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Convert to restriction by calling {@link Restrictions#eq(Expression, Expression)}. |
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If the right-hand node is string constant containing '%' |
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{@link Restrictions#like(Expression, Expression)} is used instead (since 2.16). |
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*/ |
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@Override |
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public Restriction toRestriction(Node node) |
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{ |
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Node lNode = node.jjtGetChild(0); |
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Node rNode = node.jjtGetChild(1); |
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Expression left = Jep.nodeToExpression(lNode); |
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Expression right = Jep.nodeToExpression(rNode); |
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boolean useLike = false; |
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if (rNode instanceof ASTConstant) |
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{ |
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ASTConstant constNode = (ASTConstant)rNode; |
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Object constValue = constNode.getValue(); |
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if (constValue instanceof String) |
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{ |
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useLike = ((String)constValue).contains("%"); |
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} |
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} |
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return useLike ? Restrictions.like(left, right) : Restrictions.eq(left, right); |
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} |
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// ------------------------------------------- |
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|
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} |