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jeremybenn |
/* TabularType.java -- Type descriptor for TabularData instances.
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Copyright (C) 2006, 2007 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.management.openmbean;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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/**
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* The open type descriptor for instances of the
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* {@link TabularData} class.
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*
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.5
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*/
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public class TabularType
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extends OpenType<TabularData>
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{
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/**
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* Compatible with JDK 1.5
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*/
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private static final long serialVersionUID = 6554071860220659261L;
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/**
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* The composite type used by the rows of the table.
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*/
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private CompositeType rowType;
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/**
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* The list of index names, which form the columns of the table.
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* They are retained in the order given by the user, and is
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* unmodifiable.
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*/
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private List<String> indexNames;
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/**
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* The hash code of this instance.
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*/
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private transient Integer hashCode;
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/**
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* The <code>toString()</code> result of this instance.
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*/
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private transient String string;
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/**
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* <p>
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* Constructs a new {@link TabularType} instance for the given
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* type name, description, row type and index names. All parameters
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* (including the individual elements of the array of index names)
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* must be non-null and those that are of type {@link java.lang.String}
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* must be non-empty. The array of index names must also be non-empty.
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* </p>
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* <p>
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* The result of <code>TabularData.class.getName()</code> is adopted
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* as the class name (see {@link OpenType}). The ordering of the array
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* elements is relevant in determining the indicies of the values in the
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* table, and thus in the use of the
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* {@link TabularData#get(java.lang.Object[])} and
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* {@link TabularData#remove(java.lang.Object[])} methods of the
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* {@link TabularData} class.
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* </p>
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*
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* @param name the name of this tabular type.
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* @param desc a description of this tabular type.
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* @param rowType the type of the rows of the table.
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* @param indexNames the names used to index the rows within the table.
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* @throws IllegalArgumentException if any validity constraint listed above
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* is broken.
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* @throws OpenDataException if an index name does not match a corresponding
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* name in the given row type.
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*/
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public TabularType(String name, String desc, CompositeType rowType,
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String[] indexNames)
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throws OpenDataException
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{
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super(TabularData.class.getName(), name, desc);
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if (rowType == null)
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throw new IllegalArgumentException("A null row type was given.");
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for (int a = 0; a < indexNames.length; ++a)
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{
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if (indexNames[a] == null)
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throw new IllegalArgumentException("Name " + a +
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" is null.");
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if (indexNames[a].length() == 0)
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throw new IllegalArgumentException("Name " + a +
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" is the empty string.");
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if (!(rowType.containsKey(indexNames[a])))
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throw new OpenDataException("No matching key for " +
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indexNames[a] + " was found in " +
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"the supplied row type.");
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}
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this.rowType = rowType;
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this.indexNames = Collections.unmodifiableList(Arrays.asList(indexNames));
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}
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/**
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* <p>
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* Compares this tabular data type with another object
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* for equality. The objects are judged to be equal if:
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* </p>
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* <ul>
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* <li><code>obj</code> is not null.</li>
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* <li><code>obj</code> is an instance of
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* {@link TabularType}.</li>
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* <li>The type names are equal.</li>
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* <li>The row types are equal.</li>
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* <li>The index names are equal and in the same order.</li>
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* </ul>
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*
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* @param obj the object to compare with.
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* @return true if the conditions above hold.
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*/
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public boolean equals(Object obj)
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{
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if (!(obj instanceof TabularType))
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return false;
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TabularType ttype = (TabularType) obj;
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return (ttype.getTypeName().equals(getTypeName())
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&& (ttype.getRowType().equals(getRowType()))
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&& (ttype.getIndexNames().equals(getIndexNames())));
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}
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/**
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* Returns an unmodifiable list containing the index names.
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* The ordering of these names is used to determine the indicies
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* of the {@link CompositeData} values, and is retained from that
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* used in the call to this object's constructor.
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*
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* @return an unmodifiable list of the index names used by this
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* tabular data structure.
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*/
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public List<String> getIndexNames()
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{
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return indexNames;
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}
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/**
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* Returns the type of the rows used by this tabular data structure.
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*
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* @return the row type.
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*/
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public CompositeType getRowType()
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{
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return rowType;
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}
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/**
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* <p>
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* Returns the hash code of the tabular data type.
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* This is computed as the sum of the hash codes of the
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* index names together with the hash code of the type
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* name and row type. These are the same elements
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* of the type that are compared as part of the
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* {@link #equals(java.lang.Object)} method, thus ensuring
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* that the hashcode is compatible with the equality
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* test.
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* </p>
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* <p>
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* As instances of this class are immutable, the hash code
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* is computed just once for each instance and reused
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* throughout its life.
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* </p>
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*
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* @return the hash code of this instance.
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*/
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public int hashCode()
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{
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if (hashCode == null)
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{
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int elementTotal = 0;
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for (String s : indexNames)
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elementTotal += s.hashCode();
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hashCode = Integer.valueOf(elementTotal
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+ getTypeName().hashCode()
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+ rowType.hashCode());
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}
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return hashCode.intValue();
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}
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/**
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* Returns true if the specified object is a member of this
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* tabular type. The object is judged to be so if it is
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* an instance of {@link TabularData} with an equivalent
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* type, according to the definition of
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* {@link #equals(java.lang.Object)} for {@link TabularType}.
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*
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* @param obj the object to test for membership.
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* @return true if the object is a member of this type.
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*/
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public boolean isValue(Object obj)
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{
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if (obj instanceof TabularData)
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{
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TabularData data = (TabularData) obj;
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return equals(data.getTabularType());
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}
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return false;
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}
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/**
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* <p>
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* Returns a textual representation of this instance. This
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* is constructed using the class name
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* (<code>javax.management.openmbean.TabularType</code>)
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* and each element of the instance which is relevant to
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* the definition of {@link equals(java.lang.Object)} and
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* {@link hashCode()} (i.e. the type name, the row type
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* and the index names).
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* </p>
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* <p>
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* As instances of this class are immutable, the return value
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* is computed just once for each instance and reused
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* throughout its life.
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* </p>
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*
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* @return a @link{java.lang.String} instance representing
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* the instance in textual form.
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*/
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public String toString()
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{
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if (string == null)
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string = getClass().getName()
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+ "[name=" + getTypeName()
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+ ", rowType=" + rowType
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+ ", indexNames=" + indexNames
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+ "]";
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return string;
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}
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}
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