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/*
* Copyright 2010 JBoss Inc
*
* 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 org.drools.planner.examples.common.persistence;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import org.apache.commons.io.IOUtils;
import org.drools.planner.core.solution.Solution;
public abstract class AbstractTxtSolutionImporter extends AbstractSolutionImporter {
private static final String DEFAULT_INPUT_FILE_SUFFIX = ".txt";
protected AbstractTxtSolutionImporter(SolutionDao solutionDao) {
super(solutionDao);
}
protected String getInputFileSuffix() {
return DEFAULT_INPUT_FILE_SUFFIX;
}
public abstract TxtInputBuilder createTxtInputBuilder();
public Solution readSolution(File inputFile) {
BufferedReader bufferedReader = null;
try {
bufferedReader = new BufferedReader(new FileReader(inputFile));
TxtInputBuilder txtInputBuilder = createTxtInputBuilder();
txtInputBuilder.setBufferedReader(bufferedReader);
try {
return txtInputBuilder.readSolution();
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Exception in inputFile (" + inputFile + ")", e);
} catch (IllegalStateException e) {
throw new IllegalStateException("Exception in inputFile (" + inputFile + ")", e);
}
} catch (IOException e) {
throw new IllegalArgumentException("Could not read the file (" + inputFile.getName() + ").", e);
} finally {
IOUtils.closeQuietly(bufferedReader);
}
}
public abstract class TxtInputBuilder {
protected BufferedReader bufferedReader;
public void setBufferedReader(BufferedReader bufferedReader) {
this.bufferedReader = bufferedReader;
}
public abstract Solution readSolution() throws IOException;
// ************************************************************************
// Helper methods
// ************************************************************************
public void readEmptyLine() throws IOException {
readConstantLine("");
}
public void readConstantLine(String constantValue) throws IOException {
String line = bufferedReader.readLine();
if (line == null) {
throw new IllegalArgumentException("File ends before a line is expected to be a constant value ("
+ constantValue + ").");
}
String value = line.trim();
if (!value.equals(constantValue)) {
throw new IllegalArgumentException("Read line (" + line + ") is expected to be a constant value ("
+ constantValue + ").");
}
}
public void readUntilConstantLine(String constantValue) throws IOException {
String line;
String value;
do {
line = bufferedReader.readLine();
if (line == null) {
throw new IllegalArgumentException("File ends before a line is expected to be a constant value ("
+ constantValue + ").");
}
value = line.trim();
} while (!value.equals(constantValue));
}
public int readIntegerValue() throws IOException {
return readIntegerValue("");
}
public int readIntegerValue(String prefix) throws IOException {
return readIntegerValue(prefix, "");
}
public int readIntegerValue(String prefix, String suffix) throws IOException {
String line = bufferedReader.readLine();
if (line == null) {
throw new IllegalArgumentException("File ends before a line is expected to contain an integer value ("
+ prefix + "" + suffix + ").");
}
String value = removePrefixSuffixFromLine(line, prefix, suffix);
try {
return Integer.parseInt(value);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Read line (" + line + ") is expected to contain an integer value ("
+ value + ").", e);
}
}
public String readStringValue() throws IOException {
return readStringValue("");
}
public String readStringValue(String prefix) throws IOException {
return readStringValue(prefix, "");
}
public String readStringValue(String prefix, String suffix) throws IOException {
String line = bufferedReader.readLine();
if (line == null) {
throw new IllegalArgumentException("File ends before a line is expected to contain an string value ("
+ prefix + "" + suffix + ").");
}
return removePrefixSuffixFromLine(line, prefix, suffix);
}
public String removePrefixSuffixFromLine(String line, String prefix, String suffix) {
String value = line.trim();
if (!value.startsWith(prefix)) {
throw new IllegalArgumentException("Read line (" + line + ") is expected to start with prefix ("
+ prefix + ").");
}
value = value.substring(prefix.length());
if (!value.endsWith(suffix)) {
throw new IllegalArgumentException("Read line (" + line + ") is expected to end with suffix ("
+ suffix + ").");
}
value = value.substring(0, value.length() - suffix.length());
value = value.trim();
return value;
}
public String[] splitBySpace(String line) {
return splitBySpace(line, null);
}
public String[] splitBySpace(String line, Integer numberOfTokens) {
return splitBy(line, "\\ ", "a space ( )", numberOfTokens, false, false);
}
public String[] splitBySpacesOrTabs(String line) {
return splitBySpacesOrTabs(line, null);
}
public String[] splitBySpacesOrTabs(String line, Integer numberOfTokens) {
return splitBy(line, "[\\ \\t]+", "spaces or tabs", numberOfTokens, false, false);
}
public String[] splitByPipelineAndTrim(String line, int numberOfTokens) {
return splitBy(line, "\\|", "a pipeline (|)", numberOfTokens, true, false);
}
public String[] splitBySemicolonSeparatedValue(String line, int numberOfTokens) {
return splitBy(line, ";", "a semicolon (;)", numberOfTokens, false, true);
}
public String[] splitBy(String line, String tokenRegex, String tokenName,
Integer numberOfTokens, boolean trim, boolean removeQuotes) {
String[] lineTokens = line.split(tokenRegex);
if (numberOfTokens != null && lineTokens.length != numberOfTokens) {
throw new IllegalArgumentException("Read line (" + line + ") has " + lineTokens.length
+ " tokens but is expected to contain " + numberOfTokens + " tokens separated by "
+ tokenName + ".");
}
if (trim) {
for (int i = 0; i < lineTokens.length; i++) {
lineTokens[i] = lineTokens[i].trim();
}
}
if (removeQuotes) {
for (int i = 0; i < lineTokens.length; i++) {
if (lineTokens[i].startsWith("\"") && lineTokens[i].endsWith("\"")) {
lineTokens[i] = lineTokens[i].substring(1, lineTokens[i].length() - 1);
}
}
}
return lineTokens;
}
}
}
