services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/update/AddAction.java [141:214]:
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        private String path;
        private String value;
        private Map<String, String> expressionNames;
        private Map<String, AttributeValue> expressionValues;

        private Builder() {
        }

        /**
         * A string expression representing the attribute to be acted upon
         */
        public Builder path(String path) {
            this.path = path;
            return this;
        }

        /**
         * A string expression representing the value used in the action. The value must be represented as an
         * expression attribute value token.
         */
        public Builder value(String value) {
            this.value = value;
            return this;
        }

        /**
         * Sets the 'expression values' token map that maps from value references (expression attribute values) to 
         * DynamoDB AttributeValues, overriding any existing values. 
         * The value reference should always start with ':' (colon).
         *
         * @see #putExpressionValue(String, AttributeValue)
         */
        public Builder expressionValues(Map<String, AttributeValue> expressionValues) {
            this.expressionValues = expressionValues == null ? null : new HashMap<>(expressionValues);
            return this;
        }

        /**
         * Adds a single element to the 'expression values' token map.
         *
         * @see #expressionValues(Map)
         */
        public Builder putExpressionValue(String key, AttributeValue value) {
            if (this.expressionValues == null) {
                this.expressionValues = new HashMap<>();
            }

            this.expressionValues.put(key, value);
            return this;
        }

        /**
         * Sets the optional 'expression names' token map, overriding any existing values. Use if the attribute 
         * references in the path expression are token ('expression attribute names') prepended with the 
         * '#' (pound) sign. It should map from token name to real attribute name.
         * 
         * @see #putExpressionName(String, String) 
         */
        public Builder expressionNames(Map<String, String> expressionNames) {
            this.expressionNames = expressionNames == null ? null : new HashMap<>(expressionNames);
            return this;
        }

        /**
         * Adds a single element to the optional 'expression names' token map.
         *
         * @see #expressionNames(Map) 
         */
        public Builder putExpressionName(String key, String value) {
            if (this.expressionNames == null) {
                this.expressionNames = new HashMap<>();
            }
            this.expressionNames.put(key, value);
            return this;
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services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/update/SetAction.java [154:227]:
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        private String path;
        private String value;
        private Map<String, String> expressionNames;
        private Map<String, AttributeValue> expressionValues;

        private Builder() {
        }

        /**
         * A string expression representing the attribute to be acted upon
         */
        public Builder path(String path) {
            this.path = path;
            return this;
        }

        /**
         * A string expression representing the value used in the action. The value must be represented as an
         * expression attribute value token.
         */
        public Builder value(String value) {
            this.value = value;
            return this;
        }

        /**
         * Sets the 'expression values' token map that maps from value references (expression attribute values) to
         * DynamoDB AttributeValues, overriding any existing values.
         * The value reference should always start with ':' (colon).
         *
         * @see #putExpressionValue(String, AttributeValue)
         */
        public Builder expressionValues(Map<String, AttributeValue> expressionValues) {
            this.expressionValues = expressionValues == null ? null : new HashMap<>(expressionValues);
            return this;
        }

        /**
         * Adds a single element to the 'expression values' token map.
         *
         * @see #expressionValues(Map)
         */
        public Builder putExpressionValue(String key, AttributeValue value) {
            if (this.expressionValues == null) {
                this.expressionValues = new HashMap<>();
            }

            this.expressionValues.put(key, value);
            return this;
        }

        /**
         * Sets the optional 'expression names' token map, overriding any existing values. Use if the attribute
         * references in the path expression are token ('expression attribute names') prepended with the
         * '#' (pound) sign. It should map from token name to real attribute name.
         *
         * @see #putExpressionName(String, String)
         */
        public Builder expressionNames(Map<String, String> expressionNames) {
            this.expressionNames = expressionNames == null ? null : new HashMap<>(expressionNames);
            return this;
        }

        /**
         * Adds a single element to the optional 'expression names' token map.
         *
         * @see #expressionNames(Map)
         */
        public Builder putExpressionName(String key, String value) {
            if (this.expressionNames == null) {
                this.expressionNames = new HashMap<>();
            }
            this.expressionNames.put(key, value);
            return this;
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