2010-10-20 22:45:52 +02:00
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/*
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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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2010-09-22 19:04:10 +02:00
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package com.google.refine.expr.functions;
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2010-05-05 01:24:48 +02:00
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import java.util.Collection;
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import java.util.Properties;
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2010-08-08 00:57:48 +02:00
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import org.json.JSONArray;
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2010-05-05 01:24:48 +02:00
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import org.json.JSONException;
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import org.json.JSONWriter;
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2010-09-22 19:04:10 +02:00
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import com.google.refine.expr.EvalError;
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import com.google.refine.expr.HasFieldsList;
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2010-10-07 07:19:35 +02:00
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import com.google.refine.grel.ControlFunctionRegistry;
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import com.google.refine.grel.Function;
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2010-05-05 01:24:48 +02:00
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public class Length 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.getClass().isArray()) {
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Object[] a = (Object[]) v;
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return a.length;
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} else if (v instanceof Collection<?>) {
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return ((Collection<?>) v).size();
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2010-08-08 00:57:48 +02:00
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} else if (v instanceof HasFieldsList) {
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return ((HasFieldsList) v).length();
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} else if (v instanceof JSONArray) {
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return ((JSONArray) v).length();
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2010-05-05 01:24:48 +02:00
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} else {
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String s = (v instanceof String ? (String) v : v.toString());
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return s.length();
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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 or a string");
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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("Returns the length of o");
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writer.key("params"); writer.value("array or string o");
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writer.key("returns"); writer.value("number");
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writer.endObject();
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}
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}
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