| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.pig.builtin; |
| |
| import java.io.IOException; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Type; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.data.DataBag; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.PigContext; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Sets; |
| |
| public class Invoker<T> { |
| |
| private static final Log LOG = LogFactory.getLog(Invoker.class); |
| |
| private static final Class<?> DOUBLE_ARRAY_CLASS = new double[0].getClass(); |
| private static final Class<?> INT_ARRAY_CLASS = new int[0].getClass(); |
| private static final Class<?> FLOAT_ARRAY_CLASS = new float[0].getClass(); |
| private static final Class<?> STRING_ARRAY_CLASS = new String[0].getClass(); |
| private static final Class<?> LONG_ARRAY_CLASS = new long[0].getClass(); |
| |
| @SuppressWarnings("unchecked") |
| private static final Set<Class<?>> ARRAY_CLASSES = Sets.newHashSet( |
| DOUBLE_ARRAY_CLASS, INT_ARRAY_CLASS, FLOAT_ARRAY_CLASS, STRING_ARRAY_CLASS, |
| LONG_ARRAY_CLASS); |
| |
| private Method method_; |
| private Class<?>[] paramClasses_; |
| |
| private boolean isStatic_; |
| private Class<?> selfClass_; |
| private Type returnType_; |
| |
| public Invoker(String fullName, String paramSpecsStr) |
| throws ClassNotFoundException, FrontendException, SecurityException, NoSuchMethodException { |
| this(fullName, paramSpecsStr, "true"); |
| } |
| |
| public Invoker(String fullName, String paramSpecsStr, String isStatic) |
| throws ClassNotFoundException, FrontendException, SecurityException, NoSuchMethodException { |
| String className = fullName.substring(0, fullName.lastIndexOf('.')); |
| String methodName = fullName.substring(fullName.lastIndexOf('.')+1); |
| Class<?> klazz; |
| try { |
| klazz = PigContext.resolveClassName(className); |
| } catch (IOException e) { |
| // the amusing part is that PigContext throws this to wrap one of |
| // the exceptions we declare! |
| throw new FrontendException(e); |
| } |
| String[] paramSpecs = "".equals(paramSpecsStr) ? new String[0] : paramSpecsStr.split(" "); |
| isStatic_ = "static".equalsIgnoreCase(isStatic) || "true".equals(isStatic); |
| paramClasses_ = new Class<?>[paramSpecs.length]; |
| for (int i = 0; i < paramSpecs.length; i++) { |
| paramClasses_[i] = stringToClass(paramSpecs[i]); |
| } |
| if (!isStatic_) { |
| selfClass_ = paramClasses_[0]; |
| } |
| method_ = klazz.getMethod(methodName, (isStatic_ ? paramClasses_ : dropFirstClass(paramClasses_))); |
| returnType_ = method_.getGenericReturnType(); |
| } |
| |
| @SuppressWarnings("rawtypes") |
| public Type getReturnType() { |
| return unPrimitivize((Class) returnType_); |
| } |
| |
| private static Class<?>[] dropFirstClass(Class<?>[] original) { |
| if (original.length < 2) { |
| return new Class[0]; |
| } else { |
| return Arrays.copyOfRange(original, 1, original.length-1); |
| } |
| } |
| |
| private static Object[] dropFirstObject(Object[] original) { |
| if (original.length < 2) { |
| return new Object[0]; |
| } else { |
| return Arrays.copyOfRange(original, 1, original.length-1); |
| } |
| } |
| |
| private static Class<?> stringToClass(String klass) throws FrontendException { |
| if ("string".equalsIgnoreCase(klass)) { |
| return String.class; |
| } else if ("int".equalsIgnoreCase(klass)) { |
| return Integer.TYPE; |
| } else if ("double".equalsIgnoreCase(klass)) { |
| return Double.TYPE; |
| } else if ("float".equalsIgnoreCase(klass)){ |
| return Float.TYPE; |
| } else if ("long".equalsIgnoreCase(klass)) { |
| return Long.TYPE; |
| } else if ("double[]".equalsIgnoreCase(klass)) { |
| return DOUBLE_ARRAY_CLASS; |
| } else if ("int[]".equalsIgnoreCase(klass)) { |
| return INT_ARRAY_CLASS; |
| } else if ("long[]".equalsIgnoreCase(klass)) { |
| return LONG_ARRAY_CLASS; |
| } else if ("float[]".equalsIgnoreCase(klass)) { |
| return FLOAT_ARRAY_CLASS; |
| } else if ("string[]".equalsIgnoreCase(klass)) { |
| return STRING_ARRAY_CLASS; |
| } else { |
| throw new FrontendException("unable to find matching class for " + klass); |
| } |
| |
| } |
| |
| private static Class<?> unPrimitivize(Class<?> klass) { |
| if (klass.equals(Integer.TYPE)) { |
| return Integer.class; |
| } if (klass.equals(Long.TYPE)) { |
| return Long.class; |
| } else if (klass.equals(Float.TYPE)) { |
| return Float.class; |
| } else if (klass.equals(Double.TYPE)) { |
| return Double.class; |
| } else { |
| return klass; |
| } |
| } |
| |
| private static <T> T convertToExpectedArg(Class<T> klass, Object obj) throws ExecException { |
| if (ARRAY_CLASSES.contains(klass)) { |
| DataBag dbag = (DataBag) obj; |
| if (STRING_ARRAY_CLASS.equals(klass)) { |
| List<String> dataList = Lists.newArrayList(); |
| for (Tuple t : dbag) { |
| dataList.add( (String) t.get(0)); |
| } |
| String[] dataArray = new String[dataList.size()]; |
| for (int i = 0; i < dataList.size(); i++) { |
| dataArray[i] = dataList.get(i); |
| } |
| obj = dataArray; |
| } else { |
| List<Number> dataList = bagToNumberList(dbag); |
| if (DOUBLE_ARRAY_CLASS.equals(klass)) { |
| double[] dataArray = new double[dataList.size()]; |
| for (int i = 0; i < dataList.size(); i++) { |
| dataArray[i] = dataList.get(i).doubleValue(); |
| } |
| obj = dataArray; |
| } else if (INT_ARRAY_CLASS.equals(klass)) { |
| int[] dataArray = new int[dataList.size()]; |
| for (int i = 0; i < dataList.size(); i++) { |
| dataArray[i] = dataList.get(i).intValue(); |
| } |
| obj = dataArray; |
| } else if (FLOAT_ARRAY_CLASS.equals(klass)) { |
| float[] dataArray = new float[dataList.size()]; |
| for (int i = 0; i < dataList.size(); i++) { |
| dataArray[i] = dataList.get(i).floatValue(); |
| } |
| obj = dataArray; |
| } else if (LONG_ARRAY_CLASS.equals(klass)) { |
| long[] dataArray = new long[dataList.size()]; |
| for (int i = 0; i < dataList.size(); i++) { |
| dataArray[i] = dataList.get(i).longValue(); |
| } |
| obj = dataArray; |
| } |
| } |
| } |
| try { |
| return klass.cast(obj); |
| } catch (ClassCastException e) { |
| LOG.error("Error in dynamic argument processing. Casting to: " |
| + klass + " from: " + obj.getClass(), e); |
| throw new ExecException(e); |
| } |
| } |
| |
| private static List<Number> bagToNumberList(DataBag dbag) throws ExecException { |
| List<Number> dataList = Lists.newArrayList(); |
| for (Tuple t : dbag) { |
| dataList.add( (Number) t.get(0)); |
| } |
| return dataList; |
| } |
| |
| private Object[] tupleToArgs(Tuple t) throws ExecException { |
| if ( (t == null && (paramClasses_ != null || paramClasses_.length != 0)) |
| || (t != null && t.size() < paramClasses_.length)) { |
| throw new ExecException("unable to match function arguments to declared signature."); |
| } |
| if (t == null) { |
| return null; |
| } |
| Object[] args = new Object[paramClasses_.length]; |
| for (int i = 0; i < paramClasses_.length; i++) { |
| args[i] = convertToExpectedArg(unPrimitivize(paramClasses_[i]), t.get(i)); |
| } |
| return args; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public T invoke(Tuple input) throws IOException { |
| Object[] args = tupleToArgs(input); |
| try { |
| if (!isStatic_) { |
| return (T) method_.invoke(selfClass_.cast(args[0]), dropFirstObject(args)); |
| } else { |
| return (T) method_.invoke(null, args); |
| } |
| } catch (IllegalArgumentException e) { |
| throw new ExecException(e); |
| } catch (IllegalAccessException e) { |
| throw new ExecException(e); |
| } catch (InvocationTargetException e) { |
| throw new ExecException(e); |
| } |
| } |
| |
| } |
| |
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