/**
 * 
 */
package custom.ocl.test;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.eclipse.ocl.types.OCLStandardLibrary;
import org.eclipse.uml2.uml.Classifier;
import org.eclipse.uml2.uml.Operation;
import org.eclipse.uml2.uml.UMLFactory;

import info.squam.ocl.editor.community.core.extensions.customocl.ICustomUMLOperation;
import info.squam.ocl.editor.community.core.ocldoc.parser.model.OCLDocCreationHelper;
import info.squam.ocl.editor.community.core.ocldoc.parser.model.OclDocDefine;
import info.squam.ocl.editor.community.core.ocldoc.parser.tags.ParamTag;
import info.squam.ocl.editor.community.core.ocldoc.parser.tags.ReturnTag;


public class UMLOperation_1 implements ICustomUMLOperation {

	private String opName = "xRegexMatch" ;
	
	private Operation regexMatch ;
	private OCLStandardLibrary<Classifier> oclStdLibrary ;
	
	private static final String OCLDOC_DESC = 
		"Determines a specific pattern in a string." ;
	
	private static final String OCLDOC_PARAM0_DESC = 
		"the pattern to search for" ;
	
	private static final String OCLDOC_PARAM0_TYPE = 
		"String" ;
	
	private static final String OCLDOC_RETURN_DESC = 
		"found pattern" ;
	
	
	/* (non-Javadoc)
	 * @see info.squam.ocl.editor.community.core.extensions.customocl.ICustomUMLOperation#defineOperation(org.eclipse.ocl.types.OCLStandardLibrary)
	 */
	@Override
	public Operation defineOperation(
			OCLStandardLibrary<Classifier> oclStdLibrary) {
		
		this.oclStdLibrary = oclStdLibrary ;
		
		regexMatch = UMLFactory.eINSTANCE.createOperation() ;
        regexMatch.setName(opName); //$NON-NLS-1$
        regexMatch.setType(oclStdLibrary.getString());
        regexMatch.createOwnedParameter("pattern", oclStdLibrary.getString()); //$NON-NLS-1$
        regexMatch.setIsQuery(true);
        
        return regexMatch ;
	}

	/* (non-Javadoc)
	 * @see info.squam.ocl.editor.community.core.extensions.customocl.ICustomUMLOperation#getOperationContext()
	 */
	@Override
	public Classifier getOperationContext() {
		return oclStdLibrary.getString() ;
	}

	/* (non-Javadoc)
	 * @see info.squam.ocl.editor.community.core.extensions.customocl.ICustomOCLOperation#getOCLDoc()
	 */
	@Override
	public OclDocDefine getOCLDoc() {
		ReturnTag ret = 
			OCLDocCreationHelper.Define.createReturn(OCLDOC_RETURN_DESC, OCLDOC_PARAM0_TYPE) ;
		
		ParamTag param = 
			OCLDocCreationHelper.Define.createParam("pattern", OCLDOC_PARAM0_DESC, OCLDOC_PARAM0_TYPE) ;
		
		ParamTag[] params = new ParamTag[]{param} ;
		return OCLDocCreationHelper.Define
			.createDefine(opName, OCLDOC_DESC, ret, params) ;
	}

	/* (non-Javadoc)
	 * @see info.squam.ocl.editor.community.core.extensions.customocl.ICustomOCLOperation#getOperationName()
	 */
	@Override
	public String getOperationName() {
		return opName ;
	}

	/* (non-Javadoc)
	 * @see info.squam.ocl.editor.community.core.extensions.customocl.ICustomOCLOperation#invoke(java.lang.Object, java.lang.Object[])
	 */
	@Override
	public Object invoke(Object self, Object[] args) {
		Pattern pattern = Pattern.compile((String) args[0]);
        Matcher matcher = pattern.matcher((String) self);
        
        return matcher.matches()? matcher.group() : null ;
	}

}