io.warp10.script.functions.UNWRAP.java Source code

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Here is the source code for io.warp10.script.functions.UNWRAP.java

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//
//   Copyright 2016  Cityzen Data
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.
//

package io.warp10.script.functions;

import io.warp10.continuum.gts.GTSWrapperHelper;
import io.warp10.continuum.gts.GeoTimeSerie;
import io.warp10.continuum.store.thrift.data.GTSWrapper;
import io.warp10.crypto.OrderPreservingBase64;
import io.warp10.script.NamedWarpScriptFunction;
import io.warp10.script.WarpScriptStackFunction;
import io.warp10.script.WarpScriptException;
import io.warp10.script.WarpScriptStack;

import java.util.ArrayList;
import java.util.List;

import org.apache.thrift.TDeserializer;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TCompactProtocol;

import com.google.common.base.Charsets;

/**
 * Unwrap a GTS from GTSWrapper
 */
public class UNWRAP extends NamedWarpScriptFunction implements WarpScriptStackFunction {

    private final boolean empty;

    public UNWRAP(String name, boolean empty) {
        super(name);
        this.empty = empty;
    }

    public UNWRAP(String name) {
        super(name);
        this.empty = false;
    }

    @Override
    public Object apply(WarpScriptStack stack) throws WarpScriptException {
        Object top = stack.pop();

        if (!(top instanceof String) && !(top instanceof byte[]) && !(top instanceof List)) {
            throw new WarpScriptException(getName() + " operates on a string or byte array or a list thereof.");
        }

        List<Object> inputs = new ArrayList<Object>();

        if (top instanceof String || top instanceof byte[]) {
            inputs.add(top);
        } else {
            for (Object o : (List) top) {
                if (!(o instanceof String) && !(o instanceof byte[])) {
                    throw new WarpScriptException(
                            getName() + " operates on a string or byte array or a list thereof.");
                }
                inputs.add(o);
            }
        }

        List<Object> outputs = new ArrayList<Object>();

        for (Object s : inputs) {
            byte[] bytes = s instanceof String
                    ? OrderPreservingBase64.decode(s.toString().getBytes(Charsets.US_ASCII))
                    : (byte[]) s;

            TDeserializer deser = new TDeserializer(new TCompactProtocol.Factory());

            try {
                GTSWrapper wrapper = new GTSWrapper();

                deser.deserialize(wrapper, bytes);

                GeoTimeSerie gts = GTSWrapperHelper.fromGTSWrapperToGTS(wrapper, this.empty);

                outputs.add(gts);
            } catch (TException te) {
                throw new WarpScriptException(getName() + " failed to unwrap GTS.");
            }
        }

        if (!(top instanceof List)) {
            stack.push(outputs.get(0));
        } else {
            stack.push(outputs);
        }

        return stack;
    }
}