123614539d
git-svn-id: http://google-refine.googlecode.com/svn/trunk@2171 7d457c2a-affb-35e4-300a-418c747d4874
99 lines
3.7 KiB
Java
99 lines
3.7 KiB
Java
/*
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Copyright 2010, Google Inc.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.google.refine.expr.functions.arrays;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Properties;
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import java.util.Set;
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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 Uniques implements Function {
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@Override
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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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Set<Object> set = null;
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if (v.getClass().isArray()) {
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Object[] a = (Object[]) v;
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set = new HashSet<Object>(a.length);
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for (int i = 0; i < a.length; i++) {
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set.add(a[i]);
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}
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} else {
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set = new HashSet<Object>(ExpressionUtils.toObjectList(v));
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}
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return set.toArray();
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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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@Override
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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("Returns array a with duplicates removed");
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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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