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

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Here is the source code for io.warp10.script.functions.UNWRAPENCODER.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 java.io.IOException;

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

import com.google.common.base.Charsets;

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

/**
 * Unwraps a GTSWrapper into an encoder
 */
public class UNWRAPENCODER extends NamedWarpScriptFunction implements WarpScriptStackFunction {

    public UNWRAPENCODER(String name) {
        super(name);
    }

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

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

        byte[] bytes = top instanceof String
                ? OrderPreservingBase64.decode(top.toString().getBytes(Charsets.US_ASCII))
                : (byte[]) top;

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

        try {
            GTSWrapper wrapper = new GTSWrapper();

            deser.deserialize(wrapper, bytes);

            GTSDecoder decoder = GTSWrapperHelper.fromGTSWrapperToGTSDecoder(wrapper);

            decoder.next();

            stack.push(decoder.getEncoder(true));
        } catch (TException te) {
            throw new WarpScriptException(getName() + " failed to unwrap encoder.", te);
        } catch (IOException ioe) {
            throw new WarpScriptException(getName() + " failed to unwrap encoder.", ioe);
        }

        return stack;
    }
}