Helfer AbstractSkel

Jan Burse, erstellt 04. Jan 2019
package jekpro.tools.term;
import jekpro.model.molec.BindCount;
import jekpro.model.molec.Display;
import jekpro.model.molec.EngineException;
import jekpro.model.molec.EngineMessage;
import jekpro.model.pretty.PrologWriter;
import java.io.StringWriter;
* <p>This is the base class for skeletons, except for numbers and references.</p>
* <p/>
* Warranty & Liability
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* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
* <p/>
* Rights & License
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* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
* <p/>
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
* <p/>
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
* <p/>
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
public abstract class AbstractSkel {
public final static Object VOID_OBJ = new Object();
* <p>Return a string of a skeleton.</p>
* @return The string.
public String toString() {
try {
StringWriter sw = new StringWriter();
PrologWriter.toString(this, Display.DISPLAY_CONST, sw, 0, null);
return sw.toString();
} catch (EngineMessage x) {
throw new RuntimeException("shouldn't happen", x);
} catch (EngineException x) {
throw new RuntimeException("shouldn't happen", x);