1de5e7c00e
Replaced gel with grel in other places in the code base while maintaining backward compatibility. Changed layout in expression preview dialog to accommodate long GREL name. git-svn-id: http://google-refine.googlecode.com/svn/trunk@1442 7d457c2a-affb-35e4-300a-418c747d4874
66 lines
2.3 KiB
Java
66 lines
2.3 KiB
Java
package com.google.refine.expr.functions.arrays;
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import java.util.List;
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import java.util.Properties;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONWriter;
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import com.google.refine.expr.EvalError;
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import com.google.refine.expr.ExpressionUtils;
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import com.google.refine.grel.ControlFunctionRegistry;
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import com.google.refine.grel.Function;
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import com.google.refine.util.JSONUtilities;
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public class Reverse implements Function {
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public Object call(Properties bindings, Object[] args) {
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if (args.length == 1) {
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Object v = args[0];
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if (v != null) {
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if (v instanceof JSONArray) {
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try {
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v = JSONUtilities.toArray((JSONArray) v);
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} catch (JSONException e) {
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return new EvalError(ControlFunctionRegistry.getFunctionName(this) +
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" fails to process a JSON array: " + e.getMessage());
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}
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}
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if (v.getClass().isArray() || v instanceof List<?>) {
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int length = v.getClass().isArray() ?
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((Object[]) v).length :
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ExpressionUtils.toObjectList(v).size();
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Object[] r = new Object[length];
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if (v.getClass().isArray()) {
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Object[] a = (Object[]) v;
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for (int i = 0; i < length; i++) {
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r[i] = a[r.length - i - 1];
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}
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} else {
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List<Object> a = ExpressionUtils.toObjectList(v);
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for (int i = 0; i < length; i++) {
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r[i] = a.get(r.length - i - 1);
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}
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}
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return r;
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}
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}
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}
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return new EvalError(ControlFunctionRegistry.getFunctionName(this) + " expects an array");
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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("description"); writer.value("Reverses array a");
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writer.key("params"); writer.value("array a");
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writer.key("returns"); writer.value("array");
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writer.endObject();
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}
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}
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