org.eclipse.xtext.util.EmfFormatter Maven / Gradle / Ivy

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/*******************************************************************************
 * Copyright (c) 2008 itemis AG (http://www.itemis.eu) and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *******************************************************************************/
package org.eclipse.xtext.util;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.eclipse.emf.common.util.WrappedException;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.ENamedElement;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.InternalEObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.util.FeatureMap;

import com.google.common.base.Predicate;

public class EmfFormatter {

	private static final char SPACE = ' ';
	private static final String INDENT = "    ";

	public static String objToStr(Object obj, Predicate ignoredFeatures) {
		Appendable buf = new StringBuilder(1024);
		try {
			objToStrImpl(obj, "", buf, ignoredFeatures);
		} catch (Exception e) {
			throw new WrappedException(e);
		}
		return buf.toString();
	}
	
	public static String objToStr(Object obj, EStructuralFeature... ignoredFeatures) {
		final Set ignoreUs =
			(ignoredFeatures != null && ignoredFeatures.length != 0) ?
					( ignoredFeatures.length > 1 ?
						new HashSet(Arrays.asList(ignoredFeatures))	:
						Collections.singleton(ignoredFeatures[0]) ) :
			Collections.emptySet();
		return objToStr(obj, new Predicate() {
			@Override
			public boolean apply(EStructuralFeature input) {
				return ignoreUs.contains(input);
			}
		});
	}

	private static void objToStrImpl(Object obj, String indent, Appendable buf, Predicate ignoredFeatures) throws Exception {
		String innerIdent = INDENT + indent;
		if (obj instanceof EObject) {
			EObject eobj = (EObject) obj;
			buf.append(eobj.eClass().getName()).append(" {\n");
			for (EStructuralFeature f : eobj.eClass().getEAllStructuralFeatures()) {
				if (!eobj.eIsSet(f) || ignoredFeatures.apply(f))
					continue;
				buf.append(innerIdent);
				if (f instanceof EReference) {
					EReference r = (EReference) f;
					if (r.isContainment()) {
						buf.append("cref ");
						buf.append(f.getEType().getName()).append(SPACE);
						buf.append(f.getName()).append(SPACE);
						objToStrImpl(eobj.eGet(f), innerIdent, buf, ignoredFeatures);
					} else {
						buf.append("ref ");
						buf.append(f.getEType().getName()).append(SPACE);
						buf.append(f.getName()).append(SPACE);
						refToStr(eobj, r, innerIdent, buf);
					}
				} else if (f instanceof EAttribute) {
					buf.append("attr ");
					buf.append(f.getEType().getName()).append(SPACE);
					buf.append(f.getName()).append(SPACE);
					// logger.debug(Msg.create("Path:").path(eobj));
					Object at = eobj.eGet(f);
					if (eobj != at)
						objToStrImpl(at, innerIdent, buf, ignoredFeatures);
					else
						buf.append("");
				} else {
					buf.append("attr ");
					buf.append(f.getEType().getName()).append(SPACE);
					buf.append(f.getName()).append(" ??????");
				}
				buf.append('\n');
			}
			buf.append(indent).append("}");
			return;
		}
		if(obj instanceof FeatureMap.Entry) {
			FeatureMap.Entry e = (FeatureMap.Entry)obj;
			buf.append(e.getEStructuralFeature().getEContainingClass().getName());
			buf.append(".");
			buf.append(e.getEStructuralFeature().getName());
			buf.append("->");
			objToStrImpl(e.getValue(), innerIdent, buf, ignoredFeatures);
			return ;
		}
		if (obj instanceof Collection) {
			int counter = 0;
			Collection coll = (Collection) obj;
			buf.append("[\n");
			for (Object o : coll) {
				buf.append(innerIdent);
				printInt(counter++, coll.size(), buf);
				buf.append(": ");
				objToStrImpl(o, innerIdent, buf, ignoredFeatures);
				buf.append("\n");
			}
			buf.append(indent + "]");
			return;
		}
		if (obj != null) {
			buf.append("'").append(Strings.notNull(obj)).append("'");
			return;
		}
		buf.append("null");
	}

	private static void refToStr(EObject obj, EReference ref, String indent, Appendable buf) throws Exception {
		Object o = obj.eGet(ref);
		if (o instanceof EObject) {
			EObject eo = (EObject) o;

			if (eo instanceof ENamedElement)
				buf.append("'").append(((ENamedElement) eo).getName()).append("' ");
			buf.append("ref: ");
			getURI(obj, eo, buf);
			return;
		}
		if (o instanceof Collection) {
			String innerIndent = indent + INDENT;
			buf.append("[");
			int counter = 0;
			Collection coll = (Collection) o;
			for (Iterator i = coll.iterator(); i.hasNext();) {
				Object item = i.next();
				if (counter == 0)
					buf.append('\n');
				buf.append(innerIndent);
				printInt(counter++, coll.size(), buf);
				buf.append(": ");
				getURI(obj, (EObject) item, buf);
				if (i.hasNext())
					buf.append(",\n");
				else
					buf.append('\n').append(indent);
			}
			buf.append("]");
			return;
		}
		buf.append("?????");
	}
	
	private static void printInt(int current, int max, Appendable buffer) throws IOException {
		int length = getNumberOfDigits(current);
		int maxLength = getNumberOfDigits(max);
		buffer.append(Integer.toString(current));
		for(int i = maxLength; i > length; i--) {
			buffer.append(SPACE);
		}
	}

	private static int getNumberOfDigits(int number) {
		return number <= 1 ? 1 : (int) Math.floor(Math.log10(number + 0.5)) + 1;
	}

	private static void getURI(EObject parent, EObject target, Appendable buf) throws Exception {
		Resource r = target.eResource();
		buf.append(target.eClass().getName());
		buf.append("@");
		if (r == null) {
			if (((InternalEObject)target).eIsProxy()) {
				buf.append("(unresolved proxy "+((InternalEObject)target).eProxyURI()+")");
			} else {
				buf.append("(resource null)");
			}
		} else if (parent.eResource() == r)
			buf.append(r.getURIFragment(target));
		else
			buf.append(r.getURI().toString()).append("#").append(r.getURIFragment(target));
	}

	public static String listToStr(List elements) {
		StringBuffer buff = new StringBuffer();
		for (int i = 0; i < elements.size(); i++) {
			EObject obj = elements.get(i);
			buff.append(objToStr(obj));
			if (i) obj.eContainer().eGet(obj.eContainingFeature())).indexOf(obj));
				b.append("]");
			}
			b.append("->");
		}
		b.append(obj.eClass().getName());
		EStructuralFeature nameF = obj.eClass().getEStructuralFeature("name");
		Object name = nameF != null ? obj.eGet(nameF) : null;
		if (name != null) {
			b.append("'");
			b.append(name);
			b.append("'");
		}
	}
}