TripleReader.java

package org.jcommons.file.rdf;

import org.jcommons.common.StringUtils;

public class TripleReader {

	private String triple;

	private int SE;
	private int PE;
	private int OE;

	public TripleReader(String triple) {
		this.triple = triple;
		SE = triple.indexOf(" <");
		PE = triple.indexOf("> ", SE + 1) + 1;
		OE = triple.lastIndexOf(".") - 1;
	}

	public String getTriple() {
		return triple;
	}

	public String getSubject() {
		return triple.substring(0, SE);
	}

	public String getBareSubject() {
		return triple.substring(1, SE - 1);
	}

	public String getSubjectContent() {
		String str = getSubject();
		return URICenter.zhishiDecode(str.substring(str.lastIndexOf("/") + 1,
				str.indexOf(">")));
	}

	public String getIRISubjectContent() {
		String str = getSubject();
		return StringUtils.UnicodeToString(str.substring(
				str.lastIndexOf("/") + 1, str.indexOf(">")));
	}

	public String getPredicate() {
		return triple.substring(SE + 1, PE);
	}

	public String getBarePredicate() {
		return triple.substring(SE + 2, PE - 1);
	}

	public String getPredicateContent() {
		String str = getPredicate();
		return URICenter.zhishiDecode(str.substring(str.lastIndexOf("/") + 1,
				str.indexOf(">")));
	}

	public String getIRIPredicateContent() {
		String str = getPredicate();
		return StringUtils.UnicodeToString(str.substring(
				str.lastIndexOf("/") + 1, str.indexOf(">")));
	}

	public String getObject() {
		return triple.substring(PE + 1, OE);
	}

	public String getBareObject() {
		return triple.substring(PE + 2, OE - 1);
	}

	public String getObjectContent() {
		String str = getObject();
		return URICenter.zhishiDecode(str.substring(str.lastIndexOf("/") + 1,
				str.indexOf(">")));
	}

	public String getIRIObjectContent() {
		String str = getObject();
		return StringUtils.UnicodeToString(str.substring(
				str.lastIndexOf("/") + 1, str.indexOf(">")));
	}

	public String getObjectValue() {
		String str = getObject();
		return getValue(str);
	}

	public static String getValue(String str) {
		if (str.contains("\"^^<"))
			return StringUtils.UnicodeToString(str.substring(1,
					str.indexOf("\"^^<")));
		else if (str.contains("\"@"))
			return StringUtils.UnicodeToString(str.substring(1,
					str.lastIndexOf("\"@")));
		else
			return StringUtils
					.UnicodeToString(str.substring(1, str.length() - 1));
	}

	public String getDataType() {
		String str = getObject();
		return str.substring(str.indexOf("\"^^<") + 4, str.length() - 1);
	}

	public boolean objectIsLiteral() {
		return getObject().startsWith("\"");
	}

	public boolean objectIsTypedData() {
		return objectIsLiteral() && getObject().contains("\"^^<");
	}

	public boolean objectIsURIRef() {
		return getObject().startsWith("<");
	}

	public static void main(String args[]) {
		TripleReader tr = new TripleReader(
				"<http://seonto.apexlab.org/stackoverflow/tag/principle> <http://www.w3.org/2002/07/owl#equivalentClass> <http://seonto.apexlab.org/stackoverflow/tag/statement-of-principles> .");
		System.out.println(tr.getSubject());
		System.out.println(tr.getPredicate());
		System.out.println(tr.getObjectValue());
		System.out.println(tr.getDataType());
	}
}