org.eclipse.mylyn.internal.wikitext.commonmark.Line.java Source code

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Here is the source code for org.eclipse.mylyn.internal.wikitext.commonmark.Line.java

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/*******************************************************************************
 * Copyright (c) 2015 David Green.
 * 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:
 *     David Green - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.internal.wikitext.commonmark;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import org.eclipse.mylyn.wikitext.core.parser.Locator;

import com.google.common.base.CharMatcher;
import com.google.common.base.Objects;

public class Line {

    private final String text;

    private final int offset;

    private final int lineNumber;

    public Line(int lineNumber, int offset, String text) {
        checkArgument(offset >= 0);
        checkArgument(lineNumber >= 0);
        this.lineNumber = lineNumber;
        this.offset = offset;
        this.text = checkNotNull(text);
    }

    public boolean isEmpty() {
        return !CharMatcher.WHITESPACE.negate().matchesAnyOf(text);
    }

    public String getText() {
        return text;
    }

    /**
     * Provides the 0-based offset of the first character of the line.
     * 
     * @return the line offset
     */
    public int getOffset() {
        return offset;
    }

    /**
     * Provides the 0-based line number.
     * 
     * @return the line number
     */
    public int getLineNumber() {
        return lineNumber;
    }

    /**
     * Provides a segment of this line, with {@link #getText() text}.
     * 
     * @param offset
     *            the 0-based offset of the {@link #getText() text} of this line
     * @param length
     *            the length of the {@link #getText() text} from the given {@code offset}
     * @return the segment
     */
    public Line segment(int offset, int length) {
        return new Line(lineNumber, this.offset + offset, text.substring(offset, offset + length));
    }

    public Locator toLocator() {
        return new SimpleLocator(this);
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(Line.class).add("lineNumber", lineNumber).add("offset", offset)
                .add("text", ToStringHelper.toStringValue(text)).toString();
    }
}