org.eclipse.xtext.resource.impl.DefaultResourceDescriptionDelta.java Source code

Introduction

Here is the source code for org.eclipse.xtext.resource.impl.DefaultResourceDescriptionDelta.java

Source

/*******************************************************************************
 * Copyright (c) 2009 itemis AG (http://www.itemis.eu) and others.
 * 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
 *******************************************************************************/
package org.eclipse.xtext.resource.impl;

import java.util.Iterator;

import org.eclipse.emf.common.util.URI;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.resource.IResourceDescription;
import org.eclipse.xtext.util.Arrays;

import com.google.common.collect.Iterables;

/**
 * @author Sven Efftinge - Initial contribution and API
 */
public class DefaultResourceDescriptionDelta implements IResourceDescription.Delta {

    private IResourceDescription _new;
    private IResourceDescription old;

    public DefaultResourceDescriptionDelta(IResourceDescription old, IResourceDescription _new) {
        super();
        if (old == _new) {
            throw new AssertionError("'old!=_new' constraint violated");
        }
        if (_new != null && old != null && !old.getURI().equals(_new.getURI())) {
            URI oldURI = old.getURI();
            URI newURI = _new.getURI();
            throw new AssertionError(
                    "'_new!=null && old!=null && !old.getURI().equals(_new.getURI())' constraint violated, old was "
                            + oldURI + " new was: " + newURI);
        }
        this.old = old;
        this._new = _new;
    }

    @Override
    public IResourceDescription getNew() {
        return _new;
    }

    @Override
    public IResourceDescription getOld() {
        return old;
    }

    private Boolean hasChanges;

    @Override
    public boolean haveEObjectDescriptionsChanged() {
        if (hasChanges == null) {
            hasChanges = internalHasChanges();
        }
        return hasChanges.booleanValue();
    }

    protected boolean internalHasChanges() {
        if (_new == null || old == null)
            return true;

        Iterable<IEObjectDescription> oldEObjects = old.getExportedObjects();
        Iterable<IEObjectDescription> newEObjects = _new.getExportedObjects();
        if (Iterables.size(oldEObjects) != Iterables.size(newEObjects))
            return true;

        Iterator<IEObjectDescription> iterator1 = oldEObjects.iterator();
        Iterator<IEObjectDescription> iterator2 = newEObjects.iterator();
        while (iterator1.hasNext()) {
            if (!equals(iterator1.next(), iterator2.next()))
                return true;
        }
        return false;
    }

    protected boolean equals(IEObjectDescription oldObj, IEObjectDescription newObj) {
        if (oldObj == newObj)
            return true;
        if (oldObj.getEClass() != newObj.getEClass())
            return false;
        if (oldObj.getName() != null && !oldObj.getName().equals(newObj.getName()))
            return false;
        if (!oldObj.getEObjectURI().equals(newObj.getEObjectURI()))
            return false;
        String[] oldKeys = oldObj.getUserDataKeys();
        String[] newKeys = newObj.getUserDataKeys();
        if (oldKeys.length != newKeys.length)
            return false;
        for (String key : oldKeys) {
            if (!Arrays.contains(newKeys, key))
                return false;
            String oldValue = oldObj.getUserData(key);
            String newValue = newObj.getUserData(key);
            if (oldValue == null) {
                if (newValue != null)
                    return false;
            } else if (!oldValue.equals(newValue)) {
                return false;
            }
        }
        return true;
    }

    @Override
    public URI getUri() {
        return old == null ? _new.getURI() : old.getURI();
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + " for " + getUri() + " old :" + (getOld() != null) + ",new :"
                + (getNew() != null);
    }
}