b75f1faea8
git-svn-id: http://google-refine.googlecode.com/svn/trunk@174 7d457c2a-affb-35e4-300a-418c747d4874
102 lines
4.0 KiB
Java
102 lines
4.0 KiB
Java
package com.metaweb.gridworks.operations;
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import java.util.List;
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import java.util.Properties;
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import org.json.JSONException;
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import org.json.JSONObject;
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import org.json.JSONWriter;
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import com.metaweb.gridworks.browsing.RowVisitor;
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import com.metaweb.gridworks.expr.Evaluable;
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import com.metaweb.gridworks.expr.ExpressionUtils;
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import com.metaweb.gridworks.expr.MetaParser;
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import com.metaweb.gridworks.model.AbstractOperation;
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import com.metaweb.gridworks.model.Cell;
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import com.metaweb.gridworks.model.Column;
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import com.metaweb.gridworks.model.Project;
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import com.metaweb.gridworks.model.Row;
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import com.metaweb.gridworks.model.changes.CellChange;
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public class TextTransformOperation extends EngineDependentMassCellOperation {
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private static final long serialVersionUID = -7698202759999537298L;
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final protected String _expression;
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static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
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JSONObject engineConfig = obj.getJSONObject("engineConfig");
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return new TextTransformOperation(
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engineConfig,
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obj.getString("columnName"),
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obj.getString("expression")
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);
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}
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public TextTransformOperation(JSONObject engineConfig, String columnName, String expression) {
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super(engineConfig, columnName, true);
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_expression = expression;
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}
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public void write(JSONWriter writer, Properties options)
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throws JSONException {
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writer.object();
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writer.key("op"); writer.value(OperationRegistry.s_opClassToName.get(this.getClass()));
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writer.key("description"); writer.value(getBriefDescription(null));
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writer.key("engineConfig"); writer.value(getEngineConfig());
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writer.key("columnName"); writer.value(_columnName);
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writer.key("expression"); writer.value(_expression);
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writer.endObject();
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}
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protected String getBriefDescription(Project project) {
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return "Text transform on cells in column " + _columnName + " using expression " + _expression;
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}
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protected String createDescription(Column column,
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List<CellChange> cellChanges) {
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return "Text transform on " + cellChanges.size() +
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" cells in column " + column.getHeaderLabel() + ": " + _expression;
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}
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protected RowVisitor createRowVisitor(Project project, List<CellChange> cellChanges) throws Exception {
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Column column = project.columnModel.getColumnByName(_columnName);
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Evaluable eval = MetaParser.parse(_expression);
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Properties bindings = ExpressionUtils.createBindings(project);
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return new RowVisitor() {
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int cellIndex;
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Properties bindings;
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List<CellChange> cellChanges;
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Evaluable eval;
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public RowVisitor init(int cellIndex, Properties bindings, List<CellChange> cellChanges, Evaluable eval) {
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this.cellIndex = cellIndex;
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this.bindings = bindings;
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this.cellChanges = cellChanges;
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this.eval = eval;
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return this;
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}
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public boolean visit(Project project, int rowIndex, Row row, boolean contextual) {
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Cell cell = row.getCell(cellIndex);
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ExpressionUtils.bind(bindings, row, rowIndex, cell);
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Object v = eval.evaluate(bindings);
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if ((cell != null && cell.value != null) || v != null) {
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Cell newCell = new Cell(v, (cell != null) ? cell.recon : null);
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CellChange cellChange = new CellChange(rowIndex, cellIndex, cell, newCell);
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cellChanges.add(cellChange);
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}
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return false;
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}
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}.init(column.getCellIndex(), bindings, cellChanges, eval);
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}
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}
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