net.sourceforge.urin.AbsoluteSegments Maven / Gradle / Ivy

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/*
 * Copyright 2012 Mark Slater
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
 */

package net.sourceforge.urin;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;

import static net.sourceforge.urin.Segment.*;
import static net.sourceforge.urin.SegmentsHelper.appendSegmentsTo;

public final class AbsoluteSegments extends Segments {

    private final Collection segments;

    AbsoluteSegments(final Iterable segments) {
        LinkedList newSegments = new LinkedList();
        Iterator segmentIterator = segments.iterator();
        while (segmentIterator.hasNext()) {
            Segment segment = segmentIterator.next();
            if (segment == null) {
                throw new NullPointerException("Segment cannot be null");
            } else {
                if (!DOT.equals(segment)) {
                    if (DOT_DOT.equals(segment)) {
                        if (!newSegments.isEmpty()) {
                            newSegments.removeLast();
                            if (!segmentIterator.hasNext()) {
                                newSegments.add(EMPTY);
                            }
                        }
                    } else {
                        newSegments.add(segment);
                    }
                } else {
                    if (!segmentIterator.hasNext()) {
                        newSegments.add(EMPTY);
                    }
                }
            }
        }
        this.segments = newSegments;
    }


    boolean firstPartIsSuppliedButIsEmpty() {
        return !segments.isEmpty() && EMPTY.equals(segments.iterator().next());
    }

    @Override
    boolean firstPartIsSuppliedButContainsColon() {
        return !segments.isEmpty() && segments.iterator().next().containsColon();
    }

    @Override
    AbsoluteSegments resolveRelativeTo(final Segments baseSegments) {
        return this;
    }

    @Override
    Segments replaceLastSegmentWith(final Iterable segments) {
        return new AbsoluteSegments(appendSegmentsTo(this.segments, segments));
    }

    String asString(final PrefixWithDotSegmentCriteria prefixWithDotSegmentCriteria) {
        StringBuilder result = new StringBuilder("/");
        if (prefixWithDotSegmentCriteria.matches(this)) {
            result.append("./");
        }
        Iterator segmentIterator = segments.iterator();
        while (segmentIterator.hasNext()) {
            result.append(segmentIterator.next().asString());
            if (segmentIterator.hasNext()) {
                result.append('/');
            }
        }
        return result.toString();
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        AbsoluteSegments segments1 = (AbsoluteSegments) o;
        return segments.equals(segments1.segments);
    }

    @Override
    public int hashCode() {
        return segments.hashCode();
    }

    boolean isEmpty() {
        return segments.isEmpty();
    }

    @Override
    public String toString() {
        return segments.toString();
    }
}