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/* |
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$Id$ |
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|
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Copyright (C) 2006 Jari Häkkinen, Nicklas Nordborg |
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|
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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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|
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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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|
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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; |
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|
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import net.sf.basedb.core.BaseException; |
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import net.sf.basedb.core.DbControl; |
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import net.sf.basedb.core.DynamicQuery; |
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import net.sf.basedb.core.IntensityTransform; |
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import net.sf.basedb.core.VirtualColumn; |
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import net.sf.basedb.core.query.Dynamic; |
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import net.sf.basedb.core.query.Expression; |
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import net.sf.basedb.core.query.SqlResult; |
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import net.sf.basedb.util.BioAssaySetUtil; |
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|
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import java.sql.SQLException; |
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import java.util.Stack; |
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|
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import org.nfunk.jep.Node; |
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import org.nfunk.jep.ParseException; |
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|
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/** |
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A JEP function class that adds a <code>ch(int)</code> function to a |
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JEP expression parser. The function will look up the intensity value for the |
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given channel. For example: <code>ch(1) / ch(2)</code> |
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<p> |
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Note! If the current bioassay set has stored transformed intensity values, |
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the values are un-transformed before returned by the this function. |
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Use {@link RawChannelFunction} if you need the raw values exactly |
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as they are stored in the database. |
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<p> |
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To be able to use this function it must be registered with the JEP |
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parser and, before the expression is evaluated, a {@link SqlResult} object must be set. |
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For example we can evaluate an expression for every position in a bioassay: |
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|
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<pre class="code"> |
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DbControl dc = ... |
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BioAssay assay = ... |
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String expression = "ch(1) / ch(2)"; |
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ChannelFunction ch = new ChannelFunction({3, 4}); |
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JEP jep = JepUtil.newJep(expression, ch); |
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DynamicResultIterator result = |
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assay.getSpotData().iterate(dc); |
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while (result.hasNext()) |
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{ |
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ch.setSqlResult(result.next()); |
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double value = jep.getValue(); |
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// Do something with the value |
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67 |
} |
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result.close(); |
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</pre> |
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|
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@author Nicklas |
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@version 2.0 |
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@base.modified $Date$ |
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@see Jep |
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@see BioAssaySetUtil#createJepExpression(DbControl, String, DynamicQuery) |
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*/ |
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public class ChannelFunction |
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implements JepExpressionFunction |
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{ |
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|
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private int[] channelToIndex; |
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private IntensityTransform transform; |
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private SqlResult result; |
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private int numParameters; |
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|
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/** |
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Create a new instance of this function. The new instance cannot be used |
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to dynamically evaluate expressions. It should only be used for converting |
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JEP formulas to {@link Expression}:s. |
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@see Jep#formulaToExpression(String, JepFunction[]) |
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*/ |
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public ChannelFunction() |
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{} |
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|
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/** |
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Create a new instance of this function which can be used |
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to dynamically evaluate expressions. |
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@param channelToIndex An array that maps channel numbers to column indexes in |
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the SqlResult, array position 0 maps the index of channel number 1, etc. |
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@see #setSqlResult(SqlResult) |
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*/ |
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public ChannelFunction(int[] channelToIndex, IntensityTransform transform) |
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{ |
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this.channelToIndex = channelToIndex; |
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this.transform = transform; |
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} |
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|
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/* |
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From the JepFunction interface |
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------------------------------------------- |
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*/ |
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/** |
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@return The string "ch" |
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*/ |
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@Override |
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public String getFunctionName() |
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{ |
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return "ch"; |
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} |
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// ------------------------------------------- |
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/* |
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From the JepExpressionFunction interface |
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------------------------------------------- |
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*/ |
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/** |
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Use the {@link Dynamic#column(VirtualColumn)} method to create an |
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expression referencing a channel intensity. |
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*/ |
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@Override |
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public Expression toExpression(Node node) |
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{ |
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int numChildren = node.jjtGetNumChildren(); |
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if (numChildren != 1) |
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{ |
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throw new BaseException("Invalid number of expressions for 'ch' function: " + numChildren); |
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} |
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return Dynamic.column(VirtualColumn.channelIntensity(Jep.nodeToInt(node.jjtGetChild(0)))); |
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} |
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// ------------------------------------------- |
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/* |
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From the PostfixMathCommandI interface |
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------------------------------------------- |
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*/ |
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/** |
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@return Always 1 |
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*/ |
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@Override |
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public int getNumberOfParameters() |
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{ |
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return 1; |
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} |
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@Override |
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public void setCurNumberOfParameters(int n) |
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{ |
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this.numParameters = n; |
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} |
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@Override |
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public boolean checkNumberOfParameters(int n) |
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{ |
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return n == 1; |
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} |
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@Override |
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@SuppressWarnings({"unchecked", "rawtypes"}) |
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public void run(Stack stack) |
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throws ParseException |
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{ |
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if (stack == null || stack.empty()) |
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{ |
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throw new ParseException("Stack is empty"); |
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} |
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Object channel = stack.pop(); |
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if (channel instanceof Number) |
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{ |
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stack.push(channel(((Number)channel).intValue())); |
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} |
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else |
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{ |
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throw new ParseException("Invalid parameter type: " + channel + "; expected integer"); |
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} |
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} |
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// ------------------------------------------- |
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|
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/** |
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Set a new {@link SqlResult} object that will be used the next time the |
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JEP expression is evaluated. |
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@param result The result object |
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*/ |
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public void setSqlResult(SqlResult result) |
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{ |
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this.result = result; |
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} |
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/** |
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Get the value of the specified channel of the current sql result. |
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@param channel The channel number |
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@throws ParseException Either if it's an invalid channel number or |
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if no result object has been specified. |
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*/ |
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public Object channel(int channel) |
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throws ParseException |
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{ |
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if (result == null) |
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{ |
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throw new ParseException("No result object has been specified for function ch("+channel+")"); |
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} |
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if (channelToIndex == null || channel < 1 || channel > channelToIndex.length) |
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{ |
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throw new ParseException("Invalid channel number for function ch("+channel+")"); |
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} |
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try |
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{ |
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Number n = (Number)result.getObject(channelToIndex[channel-1]); |
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if (transform != null) n = transform.unTransform(n.doubleValue()); |
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return n; |
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} |
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catch (SQLException ex) |
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{ |
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throw new ParseException(ex.getMessage()); |
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} |
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} |
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} |