/*******************************************************************************
 * Copyright (c) 2010, 2015 Ericsson
 *
 * All rights reserved. This program and the accompanying materials are
 * made available under the terms of the Eclipse Public License 2.0 which
 * accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *   Patrick Tasse - Initial API and implementation
 *******************************************************************************/

package org.eclipse.tracecompass.tmf.core.filter.model;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;

/**
 * Filter node for the regex match
 *
 * @version 1.0
 * @author Patrick Tasse
 */
public class TmfFilterMatchesNode extends TmfFilterAspectNode {

    /** matches node name */
    public static final String NODE_NAME = "MATCHES"; //$NON-NLS-1$
    /** not attribute name
     * @deprecated use {@link ITmfFilterWithNot#NOT_ATTRIBUTE} */
    @Deprecated
    public static final String NOT_ATTR = "not"; //$NON-NLS-1$
    /** regex attribute name */
    public static final String REGEX_ATTR = "regex"; //$NON-NLS-1$

    private String fRegex;
    private transient Pattern fPattern;

    /**
     * @param parent
     *            the parent node
     */
    public TmfFilterMatchesNode(ITmfFilterTreeNode parent) {
        super(parent);
    }

    /**
     * @return the regular expression
     */
    public String getRegex() {
        return fRegex;
    }

    /**
     * @param regex
     *            the regular expression
     */
    public void setRegex(String regex) {
        this.fRegex = regex;
        if (regex != null) {
            try {
                this.fPattern = Pattern.compile(regex, Pattern.DOTALL);
            } catch (PatternSyntaxException e) {
                this.fPattern = null;
            }
        }
    }

    /**
     * @return the regex pattern
     */
    protected Pattern getPattern() {
        return fPattern;
    }

    @Override
    public String getNodeName() {
        return NODE_NAME;
    }

    @Override
    public boolean matches(ITmfEvent event) {
        Pattern pattern = getPattern();
        boolean isNot = isNot();

        if (pattern == null || event == null || fEventAspect == null) {
            return false ^ isNot;
        }
        Object value = fEventAspect.resolve(event);
        if (value == null) {
            return false ^ isNot;
        }
        return pattern.matcher(value.toString()).find() ^ isNot;
    }

    @Override
    public List<String> getValidChildren() {
        return new ArrayList<>(0);
    }

    @Override
    public ITmfFilterTreeNode clone() {
        TmfFilterMatchesNode clone = (TmfFilterMatchesNode) super.clone();
        clone.setRegex(fRegex);
        return clone;
    }

    @Override
    public String toString(boolean explicit) {
        return getAspectLabel(explicit) + (isNot() ? " not matches \"" : " matches \"") + getRegex() + '\"'; //$NON-NLS-1$ //$NON-NLS-2$
    }
}