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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc.  All rights reserved.
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// http://code.google.com/p/protobuf/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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//     * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//     * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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//     * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package com.google.protobuf;
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import java.util.Map;
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/**
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 * Base interface for methods common to {@link Message} and
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 * {@link Message.Builder} to provide type equivalency.
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 *
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 * @author jonp@google.com (Jon Perlow)
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 */
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public interface MessageOrBuilder extends MessageLiteOrBuilder {
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  // (From MessageLite, re-declared here only for return type covariance.)
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  //@Override (Java 1.6 override semantics, but we must support 1.5)
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  Message getDefaultInstanceForType();
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  /**
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   * Get the message's type's descriptor.  This differs from the
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   * {@code getDescriptor()} method of generated message classes in that
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   * this method is an abstract method of the {@code Message} interface
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   * whereas {@code getDescriptor()} is a static method of a specific class.
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   * They return the same thing.
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   */
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  Descriptors.Descriptor getDescriptorForType();
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  /**
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   * Returns a collection of all the fields in this message which are set
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   * and their corresponding values.  A singular ("required" or "optional")
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   * field is set iff hasField() returns true for that field.  A "repeated"
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   * field is set iff getRepeatedFieldSize() is greater than zero.  The
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   * values are exactly what would be returned by calling
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   * {@link #getField(Descriptors.FieldDescriptor)} for each field.  The map
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   * is guaranteed to be a sorted map, so iterating over it will return fields
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   * in order by field number.
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   * <br>
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   * If this is for a builder, the returned map may or may not reflect future
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   * changes to the builder.  Either way, the returned map is itself
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   * unmodifiable.
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   */
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  Map<Descriptors.FieldDescriptor, Object> getAllFields();
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  /**
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   * Returns true if the given field is set.  This is exactly equivalent to
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   * calling the generated "has" accessor method corresponding to the field.
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   * @throws IllegalArgumentException The field is a repeated field, or
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   *           {@code field.getContainingType() != getDescriptorForType()}.
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   */
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  boolean hasField(Descriptors.FieldDescriptor field);
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  /**
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   * Obtains the value of the given field, or the default value if it is
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   * not set.  For primitive fields, the boxed primitive value is returned.
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   * For enum fields, the EnumValueDescriptor for the value is returend. For
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   * embedded message fields, the sub-message is returned.  For repeated
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   * fields, a java.util.List is returned.
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   */
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  Object getField(Descriptors.FieldDescriptor field);
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  /**
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   * Gets the number of elements of a repeated field.  This is exactly
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   * equivalent to calling the generated "Count" accessor method corresponding
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   * to the field.
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   * @throws IllegalArgumentException The field is not a repeated field, or
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   *           {@code field.getContainingType() != getDescriptorForType()}.
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   */
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  int getRepeatedFieldCount(Descriptors.FieldDescriptor field);
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  /**
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   * Gets an element of a repeated field.  For primitive fields, the boxed
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   * primitive value is returned.  For enum fields, the EnumValueDescriptor
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   * for the value is returend. For embedded message fields, the sub-message
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   * is returned.
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   * @throws IllegalArgumentException The field is not a repeated field, or
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   *           {@code field.getContainingType() != getDescriptorForType()}.
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   */
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  Object getRepeatedField(Descriptors.FieldDescriptor field, int index);
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  /** Get the {@link UnknownFieldSet} for this message. */
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  UnknownFieldSet getUnknownFields();
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}