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OpenCms is an enterprise-ready, easy to use website content management system based on Java and XML technology. Offering a complete set of features, OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently.

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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * For further information about Alkacon Software, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.util;

import org.opencms.jsp.util.CmsJspContentAccessValueWrapper;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Returns the constant Object the map was initialized with for all {@link #get(Object)} calls,
 * regardless of what the actual key is.

* * @since 7.0.2 * * @param the type of keys maintained by this map * @param the type of mapped values */ @SuppressWarnings("unchecked") public class CmsConstantMap implements Map { /** Constant Map that always returns {@link Boolean#FALSE}.*/ public static final Map CONSTANT_BOOLEAN_FALSE_MAP = new CmsConstantMap( Boolean.FALSE); /** Constant Map that always returns {@link Boolean#TRUE}.*/ public static final Map CONSTANT_BOOLEAN_TRUE_MAP = new CmsConstantMap( Boolean.TRUE); /** Constant Map that always returns an empty list. */ public static final Map> CONSTANT_EMPTY_LIST_MAP = new CmsConstantMap>( Collections.EMPTY_LIST); /** Constant Map that always returns an empty list. */ public static final Map CONSTANT_EMPTY_STRING_MAP = new CmsConstantMap("".intern()); /** The constant Object this map always returns. */ private V m_constant; /** * Creates a new constant Map.

* * @param constant the constant to return for all {@link #get(Object)} calls.

*/ public CmsConstantMap(V constant) { m_constant = constant; } /** * @see java.util.Map#clear() */ public void clear() { // NOOP } /** * @see java.util.Map#containsKey(java.lang.Object) */ public boolean containsKey(Object key) { // this Map contains all keys, since all keys return the same value return true; } /** * @see java.util.Map#containsValue(java.lang.Object) */ public boolean containsValue(Object value) { return m_constant.equals(value); } /** * @see java.util.Map#entrySet() */ public Set> entrySet() { return Collections.emptySet(); } /** * @see java.lang.Object#equals(java.lang.Object) */ @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (obj instanceof CmsConstantMap) { return m_constant.equals(((CmsConstantMap)obj).m_constant); } return false; } /** * @see java.util.Map#get(java.lang.Object) */ public V get(Object key) { return m_constant; } /** * @see java.lang.Object#hashCode() */ @Override public int hashCode() { return m_constant.hashCode(); } /** * @see java.util.Map#isEmpty() */ public boolean isEmpty() { return false; } /** * @see java.util.Map#keySet() */ public Set keySet() { return Collections.emptySet(); } /** * @see java.util.Map#put(java.lang.Object, java.lang.Object) */ public V put(Object arg0, Object arg1) { return null; } /** * @see java.util.Map#putAll(java.util.Map) */ public void putAll(Map arg0) { // NOOP } /** * @see java.util.Map#remove(java.lang.Object) */ public V remove(Object key) { return m_constant; } /** * @see java.util.Map#size() */ public int size() { return 0; } /** * @see java.util.Map#values() */ public Collection values() { return Collections.singletonList(m_constant); } }





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