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/* |
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$Id$ |
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|
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Copyright (C) 2005 Nicklas Nordborg |
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Copyright (C) 2006 Jari Häkkinen, 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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|
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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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import net.sf.basedb.core.BaseException; |
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import net.sf.basedb.core.DynamicQuery; |
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import net.sf.basedb.core.PermissionDeniedException; |
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import net.sf.basedb.core.RawDataType; |
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import net.sf.basedb.core.DbControl; |
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import net.sf.basedb.core.Metadata; |
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import net.sf.basedb.core.data.RawData; |
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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.util.BioAssaySetUtil; |
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|
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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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/** |
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A JEP function class that adds a <code>raw(string)</code> function to a |
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JEP expression parser. The function will look up the value of the raw data |
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property with the given name. For example: |
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<code>raw('ch1FgMean') - raw('ch1BgMean')</code> |
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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 raw data object must be set. |
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For example we can evaluate an expression for every raw data object |
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in a raw bioassay: |
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|
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<pre class="code"> |
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DbControl dc = ... |
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RawBioAssay assay = ... |
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String expression = "raw('ch1FgMean') - raw('ch1BgMean')"; |
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RawFunction raw = new RawFunction(assay.getRawDataType()); |
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JEP jep = JepUtil.newJep(expression, raw); |
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DataResultIterator<RawData> result = |
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assay.getRawData().iterate(dc); |
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while (result.hasNext()) |
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{ |
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raw.setRawData(result.next()); |
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double value = jep.getValue(); |
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// Do something with the value |
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} |
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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 RawFunction |
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implements JepExpressionFunction |
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{ |
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|
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private final RawDataType rawDataType; |
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private final Metadata<RawData> metaData; |
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private final DbControl dc; |
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private final boolean allowUse; |
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private int numParameters; |
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private RawData rawData; |
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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 RawFunction(boolean allowUse) |
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{ |
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this.dc = null; |
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this.metaData = null; |
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this.rawDataType = null; |
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this.allowUse = allowUse; |
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} |
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|
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/** |
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Create a new instance of this function working with raw data of |
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the specified raw data type. |
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@param rawDataType The type of raw data this function uses |
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*/ |
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public RawFunction(DbControl dc, RawDataType rawDataType, boolean allowUse) |
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{ |
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this.dc = dc; |
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this.rawDataType = rawDataType; |
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this.metaData = Metadata.getInstance(RawData.class, rawDataType.getEntityName()); |
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this.allowUse = allowUse; |
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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 "raw" |
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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 "raw"; |
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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#rawData(String)} method to create an |
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expression referencing a raw data property. |
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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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if (!allowUse) |
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{ |
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throw new PermissionDeniedException("Not allowed to use 'raw' function with merged data"); |
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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 'raw' function: " + numChildren); |
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} |
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return Dynamic.rawData(Jep.nodeToString(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 propertyName = stack.pop(); |
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if (propertyName instanceof String) |
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{ |
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stack.push(raw((String)propertyName)); |
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} |
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else |
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{ |
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throw new ParseException("Invalid parameter type: " + propertyName + "; expected string"); |
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} |
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} |
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// ------------------------------------------- |
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|
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/** |
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Get the raw data type this function uses. |
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*/ |
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public RawDataType getRawDataType() |
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{ |
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return rawDataType; |
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} |
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/** |
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Set a new raw data object that will be used the next time the |
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JEP expression is evaluated. |
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@param rawData The raw data object to use |
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*/ |
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public void setRawData(RawData rawData) |
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{ |
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this.rawData = rawData; |
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} |
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/** |
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Get the current raw data object used when evaluating the JEP expression. |
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*/ |
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public RawData getRawData() |
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{ |
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return rawData; |
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} |
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|
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/** |
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Get the value of the specified property of the current raw data object. |
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This method uses Hibernate metadata to find the value. |
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@param propertyName The name of the raw data property. Null is not allowed. |
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@return The value as a java.lang.Object |
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@throws ParseException If required arguments is null |
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*/ |
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public Object raw(String propertyName) |
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throws ParseException |
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{ |
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if (rawData == null || propertyName == null) |
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{ |
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throw new ParseException("No raw data object has been specified for function raw('"+propertyName+"')"); |
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} |
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return metaData.getPropertyPath(propertyName, false).getValue(dc, rawData); |
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} |
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} |