forked from D-Net/dnet-hadoop
90 lines
2.7 KiB
Java
90 lines
2.7 KiB
Java
package eu.dnetlib.dhp.common.java.jsonworkflownodes;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* Extracts information about port name and its properties from a string
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* of a form "{port_name, property_1, property_2, ...}"
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* @author Mateusz Kobos
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*/
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public class StringPortSpecificationExtractor {
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private final String[] propertiesRegexp;
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private final String portSpecificationRegexp;
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private final Pattern pattern;
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public static class PortSpecification {
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private final String name;
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private final String[] properties;
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public PortSpecification(String name, String[] properties) {
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this.name = name;
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this.properties = properties;
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}
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public String getName() {
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return name;
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}
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public String[] getProperties() {
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return properties;
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}
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}
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/**
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* @param propertiesRegexp regular expressions specifying pattern for
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* each of the properties associated with a port. An example of a single
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* specification: {@code "[\\w\\.]+"}.
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*/
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public StringPortSpecificationExtractor(String[] propertiesRegexp){
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this.propertiesRegexp = propertiesRegexp;
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this.portSpecificationRegexp = createRegexpString("[\\w\\._]+", propertiesRegexp);
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this.pattern = Pattern.compile(this.portSpecificationRegexp);
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}
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private static String createRegexpString(String portNameRegexp, String[] propertiesRegexp){
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StringBuilder regexp = new StringBuilder();
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regexp.append("s*\\{\\s*");
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regexp.append("("+portNameRegexp+")");
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for(String propertyRegexp: propertiesRegexp){
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regexp.append(",\\s*("+propertyRegexp+")");
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}
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regexp.append("\\s*\\}\\s*");
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return regexp.toString();
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}
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private int getPropertiesCount(){
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return propertiesRegexp.length;
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}
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public PortSpecification getSpecification(String text){
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Matcher m = pattern.matcher(text);
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if(!m.matches()){
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throw new RuntimeException(String.format("Specification of " +
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"the port (\"%s\") does not match regexp \"%s\"",
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text, portSpecificationRegexp));
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}
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final int expectedGroupsCount = getPropertiesCount()+1;
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if(m.groupCount() != expectedGroupsCount){
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StringBuilder groups = new StringBuilder();
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for(int i = 0; i < m.groupCount(); i++){
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groups.append("\""+m.group(i)+"\"");
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if(i != m.groupCount()-1) {
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groups.append(", ");
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}
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}
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throw new RuntimeException(String.format(
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"Invalid output port specification \"%s\": got %d groups "+
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"instead of %d (namely: %s)", text, m.groupCount(),
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expectedGroupsCount, groups.toString()));
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}
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String[] properties = new String[getPropertiesCount()];
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for(int i = 0; i < getPropertiesCount(); i++){
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properties[i] = m.group(i+2);
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}
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return new PortSpecification(m.group(1), properties);
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}
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}
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