org.eclipse.xtext.ide.serializer.debug.TextDocumentChangeToString.java Source code

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Here is the source code for org.eclipse.xtext.ide.serializer.debug.TextDocumentChangeToString.java

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/*******************************************************************************
 * Copyright (c) 2017 TypeFox GmbH (http://www.typefox.io) 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.ide.serializer.debug;

import java.util.Collection;
import java.util.List;

import org.eclipse.emf.common.util.URI;
import org.eclipse.xtext.formatting2.debug.TextRegionsToString;
import org.eclipse.xtext.ide.serializer.IEmfResourceChange;
import org.eclipse.xtext.ide.serializer.ITextDocumentChange;

import com.google.common.base.Joiner;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;

/**
 * @author Moritz Eysholdt - Initial contribution and API
 */
public class TextDocumentChangeToString {

    private List<IEmfResourceChange> changes = Lists.newArrayList();

    public TextDocumentChangeToString add(IEmfResourceChange change) {
        changes.add(change);
        return this;
    }

    public TextDocumentChangeToString add(Collection<IEmfResourceChange> changes) {
        this.changes.addAll(changes);
        return this;
    }

    // TODO: de-duplicate with org.eclipse.xtext.formatting2.debug.TextRegionsInTextToString.box(String, String)
    private String box(String title, String content) {
        final int width = 80;
        final int min = 3;
        int titleLength = title.length() + 2;
        final int left = Math.max((width - titleLength) / 2, min);
        StringBuilder result = new StringBuilder();
        result.append(Strings.repeat("-", left));
        result.append(" ");
        result.append(title);
        result.append(" ");
        if (left > min)
            result.append(Strings.repeat("-", width - left - titleLength));
        result.append("\n");
        result.append(org.eclipse.xtext.util.Strings.trimTrailingLineBreak(content));
        result.append("\n");
        result.append(Strings.repeat("-", width));
        return result.toString();
    }

    @Override
    public String toString() {
        List<String> result = Lists.newArrayList();
        for (IEmfResourceChange c : changes) {
            String title = getTitle(c);
            if (c instanceof ITextDocumentChange) {
                ITextDocumentChange change = (ITextDocumentChange) c;
                TextRegionsToString textRegionsToString = new TextRegionsToString();
                textRegionsToString.setIgnoreCarriageReturnInQuotes(true);
                textRegionsToString.addAllReplacements(change.getReplacements());
                textRegionsToString.setTitle(title);
                result.add(textRegionsToString.toString());
            } else {
                String box = box(title, c.toString());
                result.add(box);
            }
        }
        return Joiner.on("\n").join(result);
    }

    protected String getTitle(IEmfResourceChange change) {
        URI newUri = change.getNewURI();
        URI oldURI = change.getOldURI();
        if (oldURI == null && newUri == null) {
            return "error, both URIs are null";
        }
        if (newUri == null) {
            return "deleted " + oldURI;
        }
        if (oldURI == null) {
            return "created " + newUri;
        }
        if (oldURI.equals(newUri)) {
            return oldURI.toString();
        }
        return "renamed " + oldURI + " to " + newUri;
    }

}