ObservablePatternMatch.java

/*******************************************************************************
 * Copyright (c) 2010-2012, Zoltan Ujhelyi, Tamas Szabo, Istvan Rath 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:
 *   Zoltan Ujhelyi, Tamas Szabo - initial API and implementation
 *******************************************************************************/

package org.eclipse.incquery.tooling.ui.queryexplorer.content.matcher;

import java.util.List;

import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.incquery.databinding.runtime.adapter.DatabindingAdapterUtil;
import org.eclipse.incquery.databinding.runtime.api.IncQueryObservables;
import org.eclipse.incquery.runtime.api.IPatternMatch;
import org.eclipse.incquery.tooling.ui.queryexplorer.QueryExplorer;
import org.eclipse.incquery.tooling.ui.queryexplorer.util.DatabindingUtil;

/**
 * A PatternMatch is associated to every match of a matcher. It is the lowest level element is the treeviewer.
 * 
 * @author Tamas Szabo
 * 
 */
public class ObservablePatternMatch {

    private String text;
    private IPatternMatch match;
    private ObservablePatternMatcher parent;
    private String message;
    private ParameterValueChangedListener listener;
    private List<IObservableValue> affectedValues;

    public ObservablePatternMatch(ObservablePatternMatcher parent, IPatternMatch match) {
        this.parent = parent;
        this.match = match;
        this.message = DatabindingUtil.getMessage(match, parent.isGenerated());
        this.listener = new ParameterValueChangedListener();
        if (message != null) {
            setText(DatabindingAdapterUtil.getMessage(match, message));
            affectedValues = IncQueryObservables.observeFeatures(match, listener, message);
        } else {
            this.text = match.toString();
        }
    }

    public void dispose() {
        if (affectedValues != null) {
            for (IObservableValue val : affectedValues) {
                val.removeValueChangeListener(listener);
            }
        }
    }

    public void setText(String text) {
        this.text = text;
        String[] properties = new String[] { "text" };
        if (QueryExplorer.getInstance() != null) {
            QueryExplorer.getInstance().getMatcherTreeViewer().update(this, properties);
        }
    }

    public String getText() {
        return text;
    }

    public ObservablePatternMatcher getParent() {
        return parent;
    }

    private class ParameterValueChangedListener implements IValueChangeListener {
        @Override
        public void handleValueChange(ValueChangeEvent event) {
            setText(DatabindingAdapterUtil.getMessage(match, message));
        }
    }

    public IPatternMatch getPatternMatch() {
        return match;
    }

    public Object[] getLocationObjects() {
        return this.match.toArray();
    }
}