com.isotrol.impe3.core.engine.ImmutableRenderContext.java Source code

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Here is the source code for com.isotrol.impe3.core.engine.ImmutableRenderContext.java

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/**
 * This file is part of Port@l
 * Port@l 3.0 - Portal Engine and Management System
 * Copyright (C) 2010  Isotrol, SA.  http://www.isotrol.com
 *
 * Port@l is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Port@l is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Port@l.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.isotrol.impe3.core.engine;

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

import java.net.URI;
import java.util.Set;

import javax.ws.rs.core.UriBuilder;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Multimap;
import com.isotrol.impe3.api.Pagination;
import com.isotrol.impe3.api.component.ComponentRequestContext;
import com.isotrol.impe3.api.component.RenderContext;
import com.isotrol.impe3.api.support.ForwardingComponentRequestContext;
import com.isotrol.impe3.api.support.URIs;

/**
 * Immutable render context.
 * @author Andres Rodriguez.
 */
public final class ImmutableRenderContext extends ForwardingComponentRequestContext implements RenderContext {
    private final ComponentRequestContext delegate;
    private final Integer width;
    private final Multimap<String, String> query;

    ImmutableRenderContext(final ComponentRequestContext delegate, final Integer width,
            final Multimap<String, String> query) {
        this.delegate = checkNotNull(delegate);
        this.width = width;
        if (query == null) {
            this.query = ImmutableMultimap.of();
        } else {
            this.query = ImmutableMultimap.copyOf(query);
        }
    }

    @Override
    protected ComponentRequestContext delegate() {
        return delegate;
    }

    public Integer getWidth() {
        return width;
    }

    public URI getSamePageURI(Multimap<String, ?> parameters) {
        final UriBuilder b = UriBuilder.fromUri("");
        URIs.queryParameters(b, query);
        URIs.queryParameters(b, parameters);
        return b.build();
    }

    public URI getSamePageURI(Set<String> remove, Multimap<String, ?> parameters) {
        final UriBuilder b = UriBuilder.fromUri("");
        if (remove == null || remove.isEmpty()) {
            return getSamePageURI(parameters);
        }
        final Multimap<String, ?> qp = ArrayListMultimap.create(query);
        for (String r : remove) {
            qp.removeAll(r);
        }
        URIs.queryParameters(b, qp);
        URIs.queryParameters(b, parameters);
        return b.build();
    }

    /**
     * @see com.isotrol.impe3.api.component.RenderContext#getAbsolutePageURI(com.isotrol.impe3.api.Pagination, int)
     */
    public URI getAbsolutePageURI(Pagination pagination, int page) {
        Multimap<String, Object> parameters = ImmutableMultimap.of();
        Set<String> remove = ImmutableSet.of();
        if (pagination != null && page >= 1) {
            final String param = pagination.getParameter();
            parameters = ImmutableMultimap.<String, Object>of(param, page);
            remove = ImmutableSet.of(param);
        }
        return getSamePageURI(remove, parameters);
    }

    public URI getRelativePageURI(Pagination pagination, int delta) {
        int page = -1;
        if (pagination != null) {
            page = pagination.getPage() + delta;
        }
        return getAbsolutePageURI(pagination, page);
    }

    public URI getFirstPageURI(Pagination pagination) {
        return getAbsolutePageURI(pagination, 1);
    }

    public URI getLastPageURI(Pagination pagination) {
        int page = -1;
        if (pagination != null) {
            final Integer last = pagination.getPages();
            if (last != null) {
                page = last.intValue();
            }
        }
        return getAbsolutePageURI(pagination, page);
    }
}