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

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Here is the source code for org.eclipse.mylyn.internal.wikitext.commonmark.ProcessingContext.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.checkNotNull;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import com.google.common.base.Strings;
import com.google.common.collect.ImmutableMap;

public class ProcessingContext {

    private static final ProcessingContext EMPTY_CONTEXT = new ProcessingContext();

    public static class NamedUriWithTitle {

        private final String name;

        private final String uri;

        private final String title;

        public NamedUriWithTitle(String name, String uri, String title) {
            this.name = name;
            this.uri = uri;
            this.title = title;
        }

        public String getName() {
            return name;
        }

        public String getUri() {
            return uri;
        }

        public String getTitle() {
            return title;
        }
    }

    private final ImmutableMap<String, NamedUriWithTitle> links;

    private ProcessingContext(ImmutableMap<String, NamedUriWithTitle> links) {
        this.links = checkNotNull(links);
    }

    public ProcessingContext() {
        this(ImmutableMap.<String, NamedUriWithTitle>of());
    }

    public static ProcessingContext empty() {
        return EMPTY_CONTEXT;
    }

    public static ProcessingContext withReferenceDefinition(String name, String href, String title) {
        if (Strings.isNullOrEmpty(name)) {
            return empty();
        }
        return new ProcessingContext(
                ImmutableMap.of(name.toLowerCase(Locale.ROOT), new NamedUriWithTitle(name, href, title)));
    }

    public boolean isEmpty() {
        return links.isEmpty();
    }

    public ProcessingContext merge(ProcessingContext other) {
        checkNotNull(other);
        if (other.isEmpty()) {
            return this;
        } else if (isEmpty()) {
            return other;
        }
        Map<String, NamedUriWithTitle> mergedLinks = new HashMap<>();
        mergedLinks.putAll(other.links);
        mergedLinks.putAll(links);
        return new ProcessingContext(ImmutableMap.copyOf(mergedLinks));
    }

    public NamedUriWithTitle namedUriWithTitle(String name) {
        return links.get(name.toLowerCase());
    }

}