| /* |
| * 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.opennlp.ml.model; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.StringTokenizer; |
| import java.util.zip.GZIPInputStream; |
| |
| |
| public abstract class AbstractModelReader { |
| |
| /** |
| * The number of predicates contained in the model. |
| */ |
| protected int NUM_PREDS; |
| protected DataReader dataReader; |
| |
| public AbstractModelReader(File f) throws IOException { |
| String filename = f.getName(); |
| InputStream input; |
| // handle the zipped/not zipped distinction |
| if (filename.endsWith(".gz")) { |
| input = new GZIPInputStream(new FileInputStream(f)); |
| filename = filename.substring(0,filename.length()-3); |
| } |
| else { |
| input = new FileInputStream(f); |
| } |
| |
| // handle the different formats |
| if (filename.endsWith(".bin")) { |
| this.dataReader = new BinaryFileDataReader(input); |
| } |
| else { // filename ends with ".txt" |
| this.dataReader = new PlainTextFileDataReader(input); |
| } |
| } |
| |
| public AbstractModelReader(DataReader dataReader) { |
| super(); |
| this.dataReader = dataReader; |
| } |
| |
| /** |
| * Implement as needed for the format the model is stored in. |
| */ |
| public int readInt() throws java.io.IOException { |
| return dataReader.readInt(); |
| } |
| |
| /** |
| * Implement as needed for the format the model is stored in. |
| */ |
| public double readDouble() throws java.io.IOException { |
| return dataReader.readDouble(); |
| } |
| |
| /** |
| * Implement as needed for the format the model is stored in. |
| */ |
| public String readUTF() throws java.io.IOException { |
| return dataReader.readUTF(); |
| } |
| |
| public AbstractModel getModel() throws IOException { |
| checkModelType(); |
| return constructModel(); |
| } |
| |
| public abstract void checkModelType() throws java.io.IOException; |
| |
| public abstract AbstractModel constructModel() throws java.io.IOException; |
| |
| protected String[] getOutcomes() throws java.io.IOException { |
| int numOutcomes = readInt(); |
| String[] outcomeLabels = new String[numOutcomes]; |
| for (int i=0; i<numOutcomes; i++) outcomeLabels[i] = readUTF(); |
| return outcomeLabels; |
| } |
| |
| protected int[][] getOutcomePatterns() throws java.io.IOException { |
| int numOCTypes = readInt(); |
| int[][] outcomePatterns = new int[numOCTypes][]; |
| for (int i=0; i<numOCTypes; i++) { |
| StringTokenizer tok = new StringTokenizer(readUTF(), " "); |
| int[] infoInts = new int[tok.countTokens()]; |
| for (int j = 0; tok.hasMoreTokens(); j++) { |
| infoInts[j] = Integer.parseInt(tok.nextToken()); |
| } |
| outcomePatterns[i] = infoInts; |
| } |
| return outcomePatterns; |
| } |
| |
| protected String[] getPredicates() throws java.io.IOException { |
| NUM_PREDS = readInt(); |
| String[] predLabels = new String[NUM_PREDS]; |
| for (int i=0; i<NUM_PREDS; i++) |
| predLabels[i] = readUTF(); |
| return predLabels; |
| } |
| |
| /** |
| * Reads the parameters from a file and populates an array of context objects. |
| * @param outcomePatterns The outcomes patterns for the model. The first index refers to which |
| * outcome pattern (a set of outcomes that occurs with a context) is being specified. The |
| * second index specifies the number of contexts which use this pattern at index 0, and the |
| * index of each outcomes which make up this pattern in indicies 1-n. |
| * @return An array of context objects. |
| * @throws java.io.IOException when the model file does not match the outcome patterns or can not be read. |
| */ |
| protected Context[] getParameters(int[][] outcomePatterns) throws java.io.IOException { |
| Context[] params = new Context[NUM_PREDS]; |
| int pid=0; |
| for (int i=0; i<outcomePatterns.length; i++) { |
| //construct outcome pattern |
| int[] outcomePattern = new int[outcomePatterns[i].length-1]; |
| for (int k=1; k<outcomePatterns[i].length; k++) { |
| outcomePattern[k-1] = outcomePatterns[i][k]; |
| } |
| //System.err.println("outcomePattern "+i+" of "+outcomePatterns.length+" with "+outcomePatterns[i].length+" outcomes "); |
| //populate parameters for each context which uses this outcome pattern. |
| for (int j=0; j<outcomePatterns[i][0]; j++) { |
| double[] contextParameters = new double[outcomePatterns[i].length-1]; |
| for (int k=1; k<outcomePatterns[i].length; k++) { |
| contextParameters[k-1] = readDouble(); |
| } |
| params[pid] = new Context(outcomePattern,contextParameters); |
| pid++; |
| } |
| } |
| return params; |
| } |
| |
| } |