BasePatternMatch.java

/*******************************************************************************
 * Copyright (c) 2004-2010 Gabor Bergmann and Daniel Varro
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Gabor Bergmann - initial API and implementation
 *******************************************************************************/

package org.eclipse.incquery.runtime.api.impl;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.incquery.runtime.api.IPatternMatch;

/**
 * Base implementation of IPatternMatch.
 * 
 * @author Bergmann Gábor
 * 
 */
public abstract class BasePatternMatch implements IPatternMatch {

    public static String prettyPrintValue(Object o) {
        if (o == null) {
            return "(null)";
        }
        String name = prettyPrintFeature(o, "name");
        if (name != null) {
            return name;
        }
        /*
         * if (o instanceof EObject) { EStructuralFeature feature = ((EObject)o).eClass().getEStructuralFeature("name");
         * if (feature != null) { Object name = ((EObject)o).eGet(feature); if (name != null) return name.toString(); }
         * }
         */
        return o.toString();
    }

    public static String prettyPrintFeature(Object o, String featureName) {
        if (o instanceof EObject) {
            EStructuralFeature feature = ((EObject) o).eClass().getEStructuralFeature(featureName);
            if (feature != null) {
                Object value = ((EObject) o).eGet(feature);
                if (value != null) {
                    return value.toString();
                }
            }
        }
        return null;
    }

    // TODO performance can be improved here somewhat

    @Override
    public Object get(int position) {
        if (position >= 0 && position < parameterNames().length)
            return get(parameterNames()[position]);
        else
            return null;
    }

    @Override
    public boolean set(int position, Object newValue) {
        if (position >= 0 && position < parameterNames().length) {
            return set(parameterNames()[position], newValue);
        } else {
            return false;
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return "Match<" + patternName() + ">{" + prettyPrint() + "}";
    }

}